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National Oilwell Varco, Inc. engages in the design, manufacture, and sale of equipment and components used in oil and gas drilling and production. It also provides oilfield inspection and other services, and supply chain integration services to the upstream oil and gas industry. The company offers a range of downhole tools, such as coiled tubing tools, drilling motors, drilling tools, fishing tools, pressure control equipment, service equipment, and steering tools for drilling, fishing, well intervention, re-entry, and well completion applications. National Oilwell provides various drilling solutions, including controls and instrumentation, cranes, downhole tools, fluid end expendables and modules, force and weight measurement tools, high pressure pumping, hoisting, jacking and skidding, motion, compensation, pipe handling, power generation and distribution, rigs, rotating, safety products, solids control and waste management, and structures. It also offers a line of engineered equipment, systems, and services for offshore construction vessels, fixed and floating production installations, offshore support segments, and land applications. These engineered products include anchor handling tug and supply equipment packages, cable lay systems, cranes, FPSO equipment packages, mooring systems, motion compensation, pipelay systems, and winches. In addition, the company offers engineering and project management solutions, production solutions, and well service equipment. National Oilwell is headquartered in Houston, Texas.


Dawson Geophysical Company provides onshore seismic data acquisition services in the United States. The company acquires and processes two dimensional, three dimensional, and multicomponent seismic data for oil and gas companies and independent oil and gas operators, as well as providers of multiclient data libraries. It offers geophysical services, data acquisition, data processing, and integrated services. Dawson's two dimensional method involves the collection of seismic data in a linear fashion thus generating a single plane of subsurface seismic data. The three dimensional method produces seismic data, which produces images of the earth's subsurface. Geophysicists use computers to interpret three dimensional seismic data volumes, generate geologic models of the earth's subsurface, and identify subsurface anomalies that are favorable for the accumulation of hydrocarbons. As of September 30, 2005, the company operated 11 seismic data acquisition crews in the United States and a seismic data processing center. Dawson Geophysical was founded by L. Decker Dawson in 1952 and is headquartered in Midland, Texas.


Oceaneering International, Inc. provides technical services and hardware to oil and gas, telecommunications, aerospace, marine engineering, and construction companies, as well as to government agencies worldwide. It offers underwater services and products to the oil and gas industry. These products include remotely operated vehicles, mobile offshore production systems, built-to-order specialty hardware, engineering and project management, subsea intervention systems, nondestructive testing and inspection, and manned diving. The company provides underwater intervention, engineering services, and related manufacturing for various industrial requirements, including ship and submarine husbandry, search and recovery, commercial and government subsea cable field support, maintenance and repair, civil works projects, and commercial theme park equipment and engineering support services for the space industry. Oceaneering International also designs and manufactures subsea control valves, topside control valves, subsea chemical injection valves, and specialty control panels; as well as manufactures metal seal piping connectors and supplies onsite machining services. In addition, it performs subsea intervention and hardware installation services, including subsea well tie-backs; pipeline/flowline tie-ins and repairs; pipeline crossings; umbilical and other subsea equipment installation; subsea intervention; oilfield diving; and supporting operations of vessels. The company operates in the United States, the United Kingdom, North Sea, west Africa, Brazil, Norway, Australia, and Asia. Oceaneering International was founded in 1965 and is based in Houston, Texas.


Willbros Group, Inc. operates as an independent international contractor serving the oil, gas, and power industries, as well as government entities worldwide. The company provides construction, engineering, and specialty services. Its construction services include construction and replacement of large-diameter cross-country and offshore pipelines; fabrication of engineered structures and process modules and facilities; construction of oil and gas production facilities, pump stations, flow stations, gas compressor stations, gas processing facilities, and other related facilities; and building of offshore platforms, subsea facilities, piers, docks, and bridges. Willbros Group provides these services for onshore, coastal, and offshore locations. Its engineering services comprise feasibility studies, conceptual and detailed engineering services, field services and material procurement, and project management. The company's specialty services include dredging, pipe coating, concrete weight coating, pipe double-jointing, piling, pressure vessels, marine heavy lift services, transport of dry and liquid cargo, rig moves, maintenance and repair services, and facilities development and operations. In addition, Willbros Group provides various field services, including surveying, acquisition, material receiving and control, construction inspection, facilities startup assistance, and facilities operations. The company was founded in 1908 and is headquartered in Panama City, Panama.


FMC Technologies, Inc. engages in the design, manufacture, and servicing of machinery and systems for the energy, food processing, and air transportation industries. It operates in four segments: Energy Production Systems (EPD), Energy Processing Systems (EPS), FoodTech, and Airport Systems. The EPD segment offers systems and services used by companies involved in land and offshore exploration and production of crude oil and gas. It offers subsea production systems, surface production equipment, floating production systems, and separation systems that control the flow of oil and gas from producing wells. The EPS segment supplies high pressure valves and fittings for oilfield service customers. It offers fluid control, measurement solutions, loading systems, material handling and blending, and material transfer systems, as well as liquid and gas measurement and transportation equipment and systems to customers involved in the production, transportation, and processing of crude oil, natural gas, and petroleum-based refined products. The FoodTech segment offers food handling and processing systems used for fruit juice, frozen food, shelf-stable food, and convenience food preparation. It offers citrus juice extractors and related citrus processing equipment; aseptic juice and pulp systems; coating and cooking systems; portioners; continuous batter-breading, frying, and oven-cooking equipment; and processing lines for the production of french fries and potato chips. The FoodTech segment also supplies tomato processing equipment, as well as commercial sterilization systems, such as fillers, closers, sterilizers, and control systems used for the production of shelf-stable and pasteurized packaged foods. The Airport Systems segment provides passenger boarding bridges, cargo loaders, and other ground support products and services to commercial airlines, air freight companies, and airports. FMC Technologies was incorporated in 2000 and is headquartered in Houston, Texas.


Bolt Technology Corporation and its subsidiaries engage in the development, manufacture, and sale of seismic energy sources used in the offshore seismic exploration for oil and gas worldwide. It operates in two segments, Geophysical Equipment and Industrial Products. Geophysical Equipment segment develops, manufactures, and sells marine seismic energy sources and underwater electrical connectors and cables, air gun signature hydrophones, and pressure transducers used by the marine seismic industry. Industrial Products segment develops, manufactures, and sells miniature industrial clutches, brakes, and subfractional horsepower electric motors. These products are used in various applications, including air conditioning systems, valve timers, vending machines, point of purchase displays, and business machines. The company primarily sells its products to marine seismic exploration contractors and original equipment manufacturers. The company was founded in 1960 and is based in Norwalk, Connecticut.


Cooper Cameron Corporation manufactures oil and gas pressure control and separation equipment worldwide. It operates in three segments: Cameron, Cooper Cameron Valves (CCV), and Cooper Compression. Cameron segment provides systems and equipment used to control pressures and direct flows of oil and gas wells. Its products include surface and subsea production systems, blowout preventers, drilling and production control systems, gate valves, actuators, chokes, wellheads, drilling riser, and aftermarket parts and services. Cameron also manufactures elastomers, which are used in pressure and flow control equipment and other petroleum industry applications, as well as in the petroleum, petrochemical, rubber molding, and plastics industries. CCV segment offers valves and related systems primarily used to control pressures and direct the flow of oil and gas as they are moved from individual wellheads through flow lines, gathering lines, and transmission systems to refineries, petrochemical plants, and industrial centers for processing. Its products include gate valves, ball valves, butterfly valves, orbit valves, rotary process valves, block and bleed valves, plug valves, globe valves, check valves, actuators, chokes, and aftermarket parts and services. Cooper Compression segment provides reciprocating and centrifugal technology applications. Its products include aftermarket parts and services, integral reciprocating engine-compressors, reciprocating compressors, turbochargers, integrally geared centrifugal compressors, and compressor systems. Its aftermarket services include spare parts, technical services, repairs, overhauls, and upgrades. The company's customers include oil and gas majors; independent producers; engineering and construction companies; drilling contractors; rental companies; pipeline operators; chemical, petrochemical, and refining companies; and geothermal energy producers. Cooper Cameron was incorporated in 1994 and is headquartered in Houston, Texas.


Core Laboratories N.V. provides proprietary and patented reservoir description, production development, and reservoir management products and services to the oil and gas industry worldwide. The company provides analytical and field services to characterize properties of crude oil and petroleum products to the oil and gas industry. It also offers products and services relating to reservoir well completions, perforations, stimulations, and production. In addition, the company provides integrated services to evaluate well completions and to develop solutions for the oil recovery projects. Further, Core Laboratories combines and integrates information from reservoir description and production development services. As of March 31, 2005, it operated approximately 70 offices in 50 countries. The company was established in 1936 and is based in Amsterdam, the Netherlands.


Smith International, Inc. supplies products and services to the oil and gas exploration and production industry, the petrochemical industry, and other industrial markets worldwide. The company operates in two segments, Oilfield Products and Services, and Distribution. The Oilfield Products and Services segment includes M-I SWACO, which provides drilling and completion fluid systems and services, solids-control and separation equipment, waste-management services, and oilfield production chemicals; Smith Technologies, which manufactures and sells three-cone drill bits, diamond drill bits, and turbine products; and Smith Services, that offers products and services used for drilling, workover, well completion, and well reentry operations. The Distribution segment consists of a supply-chain management company, which markets a range of products and services, including pipe, valves, and fittings, as well as mill, safety, and other maintenance products for the energy, refining, petrochemical, power generation, and mining industries in the United States and Canada. In addition, it provides underreamers, casing exit and multilateral systems, packers, liner hangers, and supply-chain management solutions. Smith International was incorporated in 1937 and is headquartered in Houston, Texas.


Oil States International, Inc., through its subsidiaries, provides specialty products and services to oil and gas drilling and production companies worldwide. It operates in three segments: Offshore Products, Tubular Services, and Well Site Services. Offshore Products segment engages in the design, manufacture, fabrication, inspection, assembly, repair, testing, and marketing of subsea equipment and offshore vessel and rig equipment. Its products and services include flexible bearings and connector products; subsea pipeline products; marine winches, mooring and lifting systems, and rig equipment; and blowout preventor stack assembly, integration, testing, and repair services. This segment also provides forged steel Y-shaped connectors for joining two pipelines; pressure-balanced safety joints for protecting pipelines from anchor snags or a shifting sea-bottom; electrical isolation joints; and hot tap clamps that enable new pipelines to be joined into existing lines without interrupting the flow of petroleum product. In addition, Offshore Products segment provides pipeline repair hardware, which primarily includes repair clamps used to seal leaks; mechanical connectors used in repairing subsea pipelines; and flanges used to correct misalignment and swivel ring flanges. Tubular Services segment primarily offers a range of casing and tubing, threading, remediation, logistical, and inventory services; and e-commerce pricing, ordering, tracking, and financial reporting capabilities. Well Site Services segment offers workover and drilling rigs, rental equipment and work force accommodations, catering, and logistics services. The company's customers primarily include direct end-users, engineering and design companies, and prime contractors. Oil States International was incorporated in 1995 as CE Holdings, Inc. and changed its name to CONEMSCO, Inc. in 1996. Further, it changed its name to Oil States International, Inc. in 2000. The company is based in Houston, Texas.


Schlumberger Limited, an oilfield services company, supplies technology, project management, and information solutions to oil and gas industry in the United States and internationally. The company operates in two segments, Schlumberger Oilfield Services and WesternGeco. Schlumberger Oilfield Services segment supplies a range of technology services and solutions to the international petroleum industry. It provides exploration and production services required during the life of an oil and gas reservoir. This segment offers a range of products and services from formation evaluation through directional drilling, well cementing and stimulation, well completions, and productivity to consulting, software, information management, and information technology infrastructure services that support core industry operational processes. WesternGeco segment provides reservoir imaging, monitoring, and development services. Its services range from 3D and time-lapse (4D) seismic surveys to multicomponent surveys for delineating prospects and reservoir management. Schlumberger Limited was founded in 1927 and is based in New York City.


Acergy S.A, through its subsidiaries, provides seabed-to-surface engineering and construction contracting services for the offshore oil and gas industry worldwide. It operates in four segments: Subsea Construction, Umbilicals, Risers, and Flowlines (SURF); Inspection, Maintenance, and Repair (IMR); Conventional; and Trunklines. The SURF segment provides engineering and construction work relating to oil and gas fields. This includes tieback projects, which involve pipelaying, umbilical installation, and trenching or ploughing to connect an additional subsea development to an existing production facility. The IMR segment offers platform surveys, debris removal, and pipeline inspections using remotely operated vehicles. The Conventional segment comprises engineering and construction activities relating to platforms attached to the seabed and their associated pipelines. Its conventional activities include design, construction, and installation of fixed platforms. The Trunklines segment comprises offshore installation of pipelines used to carry oil or gas over long distances. The company is based in Sunbury-on-Thames, the United Kingdom.


Compagnie Generale de Geophysique-Veritas and its subsidiaries provide geophysical services principally to oil and gas companies worldwide. It provides seismic data services, including acquisition and processing, and data interpretation and management. The company also manufactures and sells marine and land geophysical equipment primarily to other geophysical service companies. Compagnie Generale de Geophysique-Veritas was founded in 1931 and is headquartered in Paris, France.


W-H Energy Services, Inc., a diversified oilfield service company, provides products and services used primarily for the drilling, completion, and production of oil and natural gas wells. The company operates through two segments, Drilling Related Products and Services, and Completion and Workover Related Products and Services. The Drilling Related Products and Services segment offers logging-while-drilling, measurement-while-drilling, directional drilling, down-hole drilling motors, rental tools, and drilling fluids for oil and natural gas companies, drilling contractors, and other oilfield service companies. The Completion and Workover Related Products and Services segment provides cased-hole wireline logging, perforating, tubing conveyed perforating, and associated rental equipment; polymers and specialty chemicals; rental tools; and coiled tubing primarily to customers onshore in the Gulf Coast region and offshore in the Gulf of Mexico. The company primarily operates in North America, Scotland, the Netherlands, Egypt, Norway, and the United Arab Emirates. W-H Energy Services was formed in 1989 and is headquartered in Houston, Texas.


MarkWest Hydrocarbon, Inc. owns a limited partnership interest in MarkWest Energy Partners, L.P., which engages in the gathering, processing, and transmission of natural gas; transportation, fractionation, and storage of natural gas liquids; and the gathering and transportation of crude oil. The company also markets natural gas and natural gas liquids. It provides its services primarily in Appalachia, Michigan, east Texas, western Oklahoma, and other areas of the southwest. The company was founded in 1988 and is headquartered in Englewood, Colorado.


Weatherford International, Ltd. provides equipment and services for use in drilling, completion, and production of oil and natural gas wells. It operates through two segments, Drilling Services and Production Systems. The Drilling Services segment provides various drilling methods, well construction products and services, drilling tools, and intervention services. The company offers underbalanced systems used during the drilling and servicing of oil and natural gas wells through underbalanced reservoir drilling, performance drilling, and managed pressure drilling methods. Well construction products and services include tubular running, cementing products, liner systems, and solid tubular expandable technologies. Drilling tools comprise drill pipe and related drill stem tools, drill collars, heavy weight pipe, and drilling jars; fishing and downhole tools, such as milling tools, casing cutters, fishing jars, spears and overshots, stabilizers, power swivels, and bottom hole assemblies; pressure control equipment, including blow-out preventers, valves, accumulators, adapters, and choke and kill manifolds; and tubular handling equipment, including elevators, spiders, slips, tongs, and kelly spinners. Intervention products and services include fishing services, thru-tubing products and services, coiled tubing, and wireline systems and production logging. The Production Systems segment provides completion systems and artificial lift systems. Completion systems comprise cased hole completion systems, sand screens, expandable sand screens, and flow control systems. Artificial lift systems include progressing cavity pumps, reciprocating rod systems, gas lift systems, electrical submersible pumps, and hydraulic and other lift systems. The company is headquartered in Houston, Texas.


GulfMark Offshore, Inc. and its subsidiaries provide offshore marine services to companies involved in offshore exploration and production of oil and natural gas. Its fleet of vessels provides various services that support the construction, positioning, and ongoing operation of offshore oil and natural gas drilling rigs and platforms. The company's offshore support vessels are used to transport materials, supplies, and personnel, as well as to move and position drilling structures. It also provides management services to other vessel owners. Its fleet consists of various types of vessels that include platform supply vessels; anchor handling vessels, towing, and supply vessels; construction support vessels; standby rescue vessels; crewboats; specialty vessels; and utility vessels. As of December 31, 2006, the company operated a fleet of 59 offshore supply vessels in the North Sea, offshore Southeast Asia, Brazil, the Mediterranean Sea, India, Mexico, and Africa. It offers its services to integrated oil and natural gas companies, independent oil and natural gas exploration and production companies working in international markets, and foreign government-owned or controlled oil and natural gas companies. The company was founded in 1996 and is based in Houston, Texas.


Helix Energy Solutions Group, Inc. operates as an offshore energy company. It provides development solutions and various other services to the open energy market, as well as to its oil and gas operations market. The company offers a range of contracting services in the shallow water and deepwater primarily in the Gulf of Mexico, North Sea, and Asia Pacific. Its services include exploration services, such as pre-installation surveys, rig positioning and installation assistance, drilling inspection, subsea equipment maintenance, reservoir engineering, geological and geophysical, modeling, well design, and engineering; and development services comprising installation of production platforms and subsea production systems, pipelay and burial, installation and tie in of riser and manifold assembly, integrated production modeling, and cable and umbilical lay and connection, as well as commissioning, testing, and inspection services. The company also provides various production services, including inspection, maintenance, and repair of production structures, risers, pipelines, and subsea equipment; well intervention; life of field support; reservoir management; production technology; and intervention engineering. Further, it offers decommissioning and remediation services; plugging and abandonment services; platform salvage and removal; pipeline abandonment; and site inspections. Helix Energy Solutions offers its products and services to independent oil and gas producers and suppliers, pipeline transmission companies, and offshore engineering and construction firms. As of December 31, 2006, it had 536 billions of cubic feet equivalent of proved reserves in the Gulf of Mexico. The company was incorporated in 1979. It was formerly known as Cal Dive International, Inc. and changed its name to Helix Energy Solutions Group, Inc. in March 2006. The company is headquartered in Houston, Texas.


Dril-Quip, Inc. manufactures offshore drilling and production equipment for the exploration of oil and gas on offshore drilling rigs. The company's principal products include subsea and surface wellheads, subsea and surface production trees, mudline hanger systems, specialty connectors and associated pipe, drilling and production riser systems, and wellhead connectors and diverters for use by national oil and gas companies. It also provides installation and reconditioning services, and rents running tools for use in connection with the installation and retrieval of its products. Dril-Quip markets its products through its sales personnel, as well as through independent sales representatives worldwide. The company was co-founded by Larry E. Reimert, Gary D. Smith, J. Mike Walker, and Gary W. Loveless in 1981. Dril-Quip is headquartered in Houston, Texas.


Halliburton Company provides engineering, construction, and maintenance services to energy, industrial, and government customers worldwide. It operates in six segments: Production Optimization, Fluid Systems, Drilling and Formation Evaluation, Digital and Consulting Solutions, Government and Infrastructure, and Energy and Chemicals. The Production Optimization segment primarily tests, measures, and provides means to manage well production in the energy sector. It also consists of production enhancement services, and completion tools and services. The Fluid Systems segment provides services and technologies to assist in the drilling and construction of oil and gas wells. The Drilling and Formation Evaluation segment primarily engages in drilling and evaluating the formations related to bore-hole construction and initial oil and gas formation evaluation. The Digital and Consulting Solutions segment provides integrated exploration and production software information systems, consulting services, real-time operations, subsea operations, value-added oilfield project management, and other integrated solutions. It also offers Landmark Graphics, which supplies integrated exploration and production software information systems, as well as professional and data management services. The Government and Infrastructure segment operates as government logistics and services contractors with civil infrastructure capabilities. It represents construction, maintenance, and logistics services for government operations, facilities, and installations. Further, this segment includes civil engineering; consulting; project management services for state and local governments and private industries; integrated security solutions; dockyard operation; and maintenance. The Energy and Chemicals segment provides engineering, procurement, construction, technology, and services for the energy and chemicals industries. Halliburton was founded in 1919 and is based in Houston, Texas.


Grant Prideco, Inc. offers various oilfield equipment and services to the oil and gas industry worldwide. It operates through three segments: Drilling Products and Services, Drill Bits, and Tubular Technology and Services. The Drilling Products and Services segment manufactures and sells drill pipes, drill collars, heavyweight drill pipe, and drill stem accessories. The Drill Bits segment designs, manufactures, and distributes fixed-cutter and roller-cone drill bits. The Tubular Technology and Services segment designs, manufactures, and sells a line of connections, and associated tubular products and accessories for oil country tubular goods and offshore applications. The company sells its products to drilling contractors, oil country tubular goods distributors, oil companies, and oilfield service companies. Grant Prideco was incorporated in 1990 and is headquartered in Houston, Texas.


Baker Hughes Incorporated supplies wellborerelated products, and technology services and systems to the worldwide oil and natural gas industry. It provides products and services for drilling, formation evaluation, completion, and production of oil and natural gas wells. The company operates in seven divisions: Baker Atlas, Baker Hughes Drilling Fluids (BHDF), Baker Oil Tools (BOT), Baker Petrolite, Centrilift, Hughes Christensen, and INTEQ. Its Baker Atlas division provides formation evaluation and wireline completion, and production services for oil and natural gas wells. The company's BHDF division provides drilling fluids, completion fluids, and fluids environmental services. BOT division offers downhole completion, workover, and fishing equipment and services. Its Baker Petrolite division provides specialty chemicals primarily to oil and natural gas production, refining, pipeline transportation, petrochemical, agricultural, and iron and steel manufacturing industries. This division also offers polymer-based products to a range of industrial and consumer markets. The company's Centrilift division manufactures and supplies electrical submersible pump systems and progressing cavity pump systems. Its Hughes Christensen division offers drill bits, primarily Tricone roller cone bits and fixed-cutter polycrystalline diamond compact bits, to the oil and natural gas industry. INTEQ division supplies drilling and evaluation services, which include directional drilling, measurement-while-drilling, and logging-while-drilling services. Baker Hughes Incorporated is headquartered in Houston, Texas.


CARBO Ceramics, Inc. engages in the production and supply of ceramic proppant for use in the hydraulic fracturing of natural gas and oil wells. The company, through its subsidiary, Pinnacle Technologies, Inc., provides fracture diagnostic services and hydraulic fracture simulation software. It manufactures four ceramic proppants under the names CARBOHSP, CARBOPROP, CARBOLITE, and CARBOECONOPROP. CARBOHSP and CARBOPROP are designed primarily for use in deep gas wells. CARBOLITE and CARBOECONOPROP are designed for use in moderate depth and shallower oil wells. Its products are marketed worldwide through oilfield service companies that provide hydraulic fracturing services for companies involved in natural gas and oil exploration and production. CARBO Ceramics was formed in 1987 and is headquartered in Irving, Texas.


FX Energy, Inc. engages in the exploration, development, and production of oil and gas properties in the Republic of Poland and the United States. The company's projects comprise the exploration and exploitation of oil and gas prospects in association with the Polish Oil and Gas Company and other industry partners. Its activities in Poland are conducted in four project areas: Fences I, Fences II, Fences III, and Wilga. The company produces oil from fields in Cut Bank, Bears Den, and Rattlers Butte properties in Montana; and Trap Spring, Munson Ranch, and Bacon Flat properties in Nevada. It also has an oilfield services company in northern Montana that performs contract drilling and well services, including drilling, workovers, location work, cementing, and acidizing in the United States. As of December 31, 2004, it had proved reserves of 809 thousand oilfield barrels of oil in the United States, as well as 111 thousand oilfield barrels of oil and 10,198 million cubic feet of natural gas in Poland. FX Energy has a strategic relationship with the Polish Oil and Gas Company. The company is based in Salt Lake City, Utah.


TGC Industries, Inc. engages in the geophysical service business in the continental United States. The company primarily conducts three dimensional seismic and gravity surveys for oil and natural gas exploration and development companies. It also provides gravity information. TGC Industries was founded in 1967 and is headquartered in Plano, Texas.


Superior Energy Services, Inc. provides oilfield services and equipment focusing on serving the production-related needs of oil and gas companies in the Gulf of Mexico and the drilling-related needs of oil and gas companies worldwide. The company operates through five segments: Well Intervention, Rental Tools, Marine, Other Oilfield Services, and Oil and Gas. The Well Intervention segment provides plug and abandonment services, coiled tubing services, well pumping and stimulation services, data acquisition services, gas lift services, electric wireline services, hydraulic drilling and workover services, well control services, engineering support, technical analysis, and mechanical wireline services that perform various maintenance and repairs to producing wells, as well as modifications to wells. The Rental Tools segment rents and sells equipment for use with onshore and offshore oil and gas well drilling, completion, production, and workover activities. The Marine segment operates liftboats for production service activities, as well as oil and gas production facility maintenance, construction operations, and platform removals. It operated a fleet of 50 liftboats, as of December 31, 2004. The Other Oilfield Services segment provides contract operations and maintenance services; transportation and logistics services; offshore oil and gas cleaning services; oilfield waste treatment services; dockside cleaning of items, including supply boats, cutting boxes, and process equipment; and manufactures and sells drilling instrumentation and oil spill containment equipment. The Oil and Gas segment acquires mature oil and gas properties and produces and sells remaining economic oil and gas reserves prior to decommissioning. Superior Energy Services is headquartered in Harvey, Louisiana.


Natural Gas Services Group, Inc. (NGS) provides equipment and services to the natural gas and oil industry in the United States. The company manufactures, fabricates, sells, and leases natural gas compressors for use in the oil and gas wells, gas transportation lines, and processing plants. It also manufactures and sells flare tips and ignition systems for oil and gas plant, and production facilities. In addition, NGS provides maintenance services for the compressors. As of December 31, 2004, the company had 549 natural gas compressors under lease to third parties. NGS was founded by Wallace C. Sparkman and Wallace O. Sellers in 1998. The company is based in Midland, Texas.


Cal Dive International, Inc. operates as a marine contractor providing manned diving, pipelay, and pipe burial services to the offshore oil and natural gas industry. It offers saturation, surface, and mixed gas diving services. The company also provides diving support services, such as construction, inspection, maintenance, repair, and decommissioning of offshore production and pipeline infrastructure on the Gulf of Mexico Outer Continental Shelf, as well as in select international offshore markets, such as the Middle East, southeast Asia, and Australia. Its customers include oil and natural gas producers, pipeline transmission companies, and offshore engineering and construction firms. As of December 31, 2006, the company owned and operated a fleet of 26 vessels, including 23 surface and saturation diving support vessels, as well as 3 shallow water pipelay vessels. Cal Dive International was founded in 1975 and is headquartered in Houston, Texas. Cal Dive International Inc. operates as a subsidiary of Helix Energy Solutions Group, Inc.


Warren Resources, Inc. engages in the acquisition, exploration, and development of onshore natural gas and oil reserves in the United States. It primarily develops coalbed methane properties located in the Rocky Mountain region; and natural gas properties located in the Rocky Mountain region, as well as owns oil interests in the Wilmington Townlot unit located in the Los Angeles Basin of California. As of September 30, 2005, the company owned natural gas and oil leasehold interests in approximately 279,814 gross acres. Warren Resources' properties are primarily located in Wyoming, California, New Mexico, North Dakota, and Texas. As of December 31, 2004, its estimated net proved reserves were 103.6 billion cubic feet. The company was founded in 1990 and is headquartered in New York City.


Allis-Chalmers Energy, Inc. provides oilfield services and equipment to the oil and gas exploration and development companies principally in Texas, Louisiana, New Mexico, Colorado, and Oklahoma; offshore in the United States Gulf of Mexico; and offshore and onshore in Mexico. It operates through four segments: Casing and Tubing Services, Directional Drilling Services, Compressed Air Drilling, and Other Services. The Casing and Tubing Services segment offers installation casing and tubing, change out drill pipe, and retrieve production tubing services for onshore and offshore drilling, and workover operations. The Directional Drilling Services segment provides directional, horizontal, and measure while drilling' services to the oil and gas companies operating onshore and offshore in Texas, Louisiana, and Oklahoma. The Compressed Air Drilling segment offers compressed air, and related products and services for air drilling, workover, completion, and transmission segments of the oil, gas, and geothermal industries. The Other Services segment provides oilfield rental tools, principally renting spiral drill pipe and other specialty tools to oil and gas operators. It also provides downhole production services. Allis-Chalmers Energy is based in Houston, Texas. Allis-Chalmers Energy, Inc. acquired Capcoil Tubing Services, Inc., that provides coil tubing services, in May 2005.


Complete Production Services, Inc. provides specialized services and products to develop hydrocarbon reserves for oil and gas companies primarily in North America and Southeast Asia. The company operates in three segments: Completion and Production Services, Drilling Services, and Product Sales. The Completion and Production Services segment establishes and maintains the flow of oil and gas throughout the life of a well. It offers intervention services, such as completion, workover, and maintenance services; down hole and well site services, which include electric-line, slickline, production optimization, production testing, rental, and fishing services; and fluid handling services, such as fluid transportation, heating, pumping, and disposal services that helps to move, store, and dispose of fluids involved in the development and production of reservoirs. The Drilling Services segment provides land drilling, specialized rig logistics, and site preparation for oil and gas production companies in the Barnett Shale region of north Texas. The Product Sales segment sells oil and gas field equipment, including completion, flow control, and artificial lift equipment, as well as tubular goods. The company sells these products through its supply stores and agents. Its customers include multinational and independent oil and gas producers, as well as independent producers and land-based drilling contractors. The company was founded in 2001. It was formerly known as Integrated Production Services, Inc. and changed its name to Complete Production Services, Inc. in 2005. The company is headquartered in Houston, Texas.


RPC, Inc., together with its subsidiaries, provides a range of specialized oilfield services and equipment primarily to independent and major oilfield companies. Its serviced are offered to companies engaged in the exploration, production, and development of oil and gas properties throughout the United States, including the Gulf of Mexico, mid-continent, southwest, and Rocky Mountain regions, as well as in selected international markets. The company operates in two segments, Technical Services and Support Services. The Technical Services segment consists primarily of pressure pumping, snubbing, coiled tubing, nitrogen, well control, down-hole tools, wire line, fluid pumping, and casing installation services. The Support Services segment includes the company's oil and gas service lines that primarily provide equipment for customer use or services to assist their operations. The equipment and services provided include drill pipe and related tools, pipe handling, inspection and storage services, work platform marine vessels, and oilfield training services. RPC was organized in 1984 and is headquartered in Atlanta, Georgia.


TETRA Technologies, Inc. operates as an oil and gas services company. It manufactures integrated calcium chloride and brominated products, and supplies feedstocks to energy and other markets worldwide. The company operates in three divisions: Fluids, Well Abandonment and Decommissioning (WAD), and Production Enhancement. The Fluids division manufactures and markets clear brine fluids to the oil and gas industry for well drilling, completion, and workover operations. It also markets certain fluids and dry calcium chloride to various domestic and international markets outside the energy industry. The WAD division provides services required for the abandonment of depleted oil and gas wells, as well as the decommissioning of platforms, pipelines, and other associated equipment. It also produces oil and gas from wells acquired in its well abandonment and decommissioning business, and provides electric wireline, engineering, workover, and drilling services. The Production Enhancement division provides production testing services in the Texas, Louisiana, Alabama, Mississippi, the offshore Gulf of Mexico, and certain Latin American markets. It designs, fabricates, sells, leases, and services wellhead compression equipment primarily used for production from mature, low pressure natural gas wells located principally in the mid-continent, Rocky Mountain, Texas, and Louisiana regions of the United States and western Canada. The division also provides technology and services required for the separation and recycling of oily residuals generated from petroleum refining operations. As of December 31, 2004, the company had 22,405,000 thousand cubic feet of proved natural gas reserves and 2,646,000 barrels of proved oil reserves. TETRA Technologies was incorporated in 1981 and is headquartered in Woodlands, Texas.


Particle Drilling Technologies, Inc., a development stage company, engages in the development of proprietary drilling system technology. Its technology is designed to increase the rate-of-penetration in the drilling process, particularly in hard rock drilling environments. This system is designed to entrain, circulate, and recover shot in the mud system without allowing the shot to circulate through the rig pumps. The company was founded in 2002 as MedXLink Corp. and changed its name to Particle Drilling Technologies, Inc. in January 2005. Particle Drilling Technologies is based in Houston, Texas.


North American Energy Partners, Inc. provides resource services to oil and natural gas, petrochemical, and various natural resource companies in western Canada. The company's services include mining and site preparation, piling, and pipeline installation. Its mining services include overburden removal, hauling sand and gravel, mining ore body and delivering the ore to the crushing facility, supplying labor and equipment to support the owners' mining operations, constructing infrastructure associated with mining operations, and reclamation activities, such as contouring of waste dumps, and placement of secondary materials and muskeg. The company's site preparation services include clearing, stripping, excavating, and grading for mining operations and other general construction projects, as well as include underground utility installations for plant, refinery, and commercial building construction. Its piling services include installation of various types of driven and drilled piles, caissons, and earth retention and stabilization systems for commercial buildings, plants and refineries, and infrastructure projects. The company offers pipeline installation services, such as installing transmission and distribution pipes made of steel, plastic, and fiberglass materials for oil and natural gas transmission. As of March 31, 2007, the company operated approximately 690 pieces of heavy construction equipment and approximately 660 ancillary vehicles. North American Energy Partners was founded in 2003 and is headquartered in Acheson, Canada.


Superior Well Services, Inc. provides well-site solutions to oil and natural gas companies. It offers technical pumping services and down-hole surveying services. The company's technical pumping services include stimulation services, such as fracturing and acidizing, which are designed to improve the flow of oil and natural gas from producing zones; nitrogen stimulation services; and cementing services that includes cement and water with various solid and liquid additives to create a cement slurry designed to ensure the proper pump time, compression strength, fluid loss control, vary depending on the well depth, down-hole temperatures and pressures, and formation characteristics. It also sells casing attachments, such as baffle plates, centralizers, float shoes, guide shoes, formation packer shoes, rubber plugs, and wooden plugs. The company's down-hole surveying services are logging services that engage in the gathering of down-hole information to identify various characteristics of the down-hole rock formations, casing cement bond, and mechanical integrity; and perforating services as the initial step of stimulation by lowering specialized tools and perforating guns into a well bore by wire-line. The specialized tools transmit data to surface computer to verify the integrity of the cement and position the perforating gun. The company serves regional, independent oil and natural gas companies in active domestic oil and natural gas producing regions, including the Appalachian, Mid-Continent, Rocky Mountain, and southeast and southwest regions of the United States. It operates service centers located in Pennsylvania, Alabama, West Virginia, Virginia, Mississippi, Texas, New Mexico, Ohio, Oklahoma, Utah, Louisiana, Michigan, Arkansas, and Colorado. As of December 31, 2006, it owned a fleet of 558 commercial vehicles and 81 logging and perforating trucks and cranes. Superior Well Services was founded in 1997 and is based in Indiana, Pennsylvania.


Lufkin Industries, Inc. and its subsidiaries engage in the design, manufacture, sale, and service of oil field pumping units, power transmission products, and highway trailers worldwide. Its oil field products include artificial reciprocating rod lift equipment and related products, which are used to extract crude oil and other fluids from wells. The power transmission products consist of high-speed and low-speed speed increasing and reducing gearboxes for industrial applications. The company's highway trailers comprise van, float, and dump trailers for the freight-hauling market. Lufkin Industries primarily sells its products to oil and gas companies and various industries, as well as to small and medium size fleet freight-hauling companies. It operates in the United States, Europe, Canada, and Latin America. The company was founded in 1902 and is based in Lufkin, Texas.


Trico Marine Services, Inc., through its subsidiaries, provides marine support vessels to the offshore oil and gas industry in Mexico and Brazil. The company, through its fleet offers a range of services, including the transportation of drilling materials, supplies, and crews to drilling rigs and other offshore facilities; towing drilling rigs and equipment; and support for the construction, installation, repair, and maintenance of offshore facilities. It also provides support for deepwater remotely operated vehicles, well stimulation, sea floor cable laying, and trenching services. As of December 31, 2006, the company's fleet consisted of 68 vessels, including 10 platform supply vessels; 6 anchor handling towing and supply vessels; 44 supply vessels; 7 crew boats; and a line handling vessel. The company is headquartered in Houston, Texas.


BJ Services Company provides pressure pumping and other oilfield services for the petroleum industry worldwide. The company's pressure pumping services consist of cementing and stimulation services used in the completion of new oil and natural gas wells, and in remedial work on existing wells both onshore and offshore. Its stimulation services include fracturing, acidizing, sand control, nitrogen services, coiled tubing, and service tools; and cementing services consists of pumping cement slurry into a well between the casing and the wellbore to isolate fluids. The company offers other oilfield services, including completion tools, completion fluids, and casing and tubular services for oil and natural gas exploration and production industry; commissioning and inspection services for refineries, pipelines, and offshore platforms; and production chemical services. Its services are provided both on land and offshore on-call basis through regional and district facilities. The company provides pressure pumping services to independent oil and natural gas producing companies, as well as national oil companies. BJ Services was founded by Byron Jackson in 1872 and is headquartered in Houston, Texas.


Newpark Resources, Inc. provides fluids management, environmental, and oilfield services to the oil and gas exploration and production industry. It offers drilling fluids, and associated engineering and technical services; installs, rents, and sells hardwood and composite interlocking mats that are used for temporary access roads and work sites in oilfield and other construction applications; and processes and disposes oilfield exploration and production waste, and nonhazardous industrial waste; and sells lumber, timber, wood chips, bark, and sawdust. The company also provides other services for the oil and gas exploration and production industry, which include oilfield construction services, including hooking-up and connecting wells, installing production equipment, and maintaining the production site and facilities; waste pit design, construction, and installation; regulatory compliance assistance; and site remediation and closure. In addition, Newpark Resources engages in sourcing, processing, packaging, and the distributing minerals used for fillers/extenders in paint, plastics, ceramics, and oil service end products. The company primarily operates in the Louisiana and Texas Gulf Coast, the United States mid-continent, and United States Rocky Mountains, as well as in western Canada and the Mediterranean regions. Newpark was founded in 1932 and is based in Metairie, Louisiana. Newpark Resources, Inc. acquired OLS Consulting Services, Inc. in April 2005.


Basic Energy Services, Inc. provides well site services to oil and gas drilling and producing companies in the United States. It operates in four segments: Well Servicing, Fluid Services, Drilling and Completion Services, and Well Site Construction Services. The Well Servicing segment provides maintenance services involving removal, repair, and replacement of down-hole equipment and returning the well to production; workover; new well completion; and plugging and abandonment services. As of December 31, 2006, this segment operated a fleet of 365 well service rigs and 90 facilities in Texas, Wyoming, Oklahoma, North Dakota, New Mexico, Louisiana, Colorado, and Montana. The Fluid Services segment provides oilfield fluid supply, transportation, and storage services. Its services include fluid services, salt water disposal well services, fresh and brine water stations, and rental of portable frac tanks and test tanks used to store fluids on well sites. The Drilling and Completion Services segment provides pressure pumping services, such as cementing, acidizing, fracturing, coiled tubing, and pressure testing; cased-hole wireline services; underbalanced drilling in low pressure and fluid sensitive reservoirs; and rental and fishing tools. This segment offers these services through a fleet of 69 pressure pumping units, 43 air compressor packages, and 11 cased-hole wireline units as of the above date. The Well Site Construction Services segment provides services for the construction and maintenance of oil and gas production infrastructure, such as preparing and maintaining access roads and well locations; installing small diameter gathering lines and pipelines; building of drilling locations; and maintenance of production facilities. The company serves independent oil and gas companies located in Texas, Louisiana, Oklahoma, New Mexico, and the Rocky Mountain States. Basic Energy Services, Inc. is based in Midland, Texas.


Austral Pacific Energy, Ltd. engages in the acquisition, exploration, and development of oil and gas properties in New Zealand, Papua New Guinea, and Australia. It holds varying net interests equivalent to approximately 2.6 million acres of exploration permits in New Zealand and 0.8 million acres of exploration interests in Papua New Guinea. The company was incorporated as Pryme Energy Resources, Ltd. in 1979 and subsequently changed its name to Indo-Pacific Energy, Ltd. Its name was further changed to Austral Pacific Energy, Ltd. in 2003. The company is based in Wellington, New Zealand.


OMNI Energy Services Corp. operates as an integrated oilfield service company. It provides onshore seismic drilling, permitting, survey, and helicopter support services; helicopter transportation services; and environmental cleaning services in the United States and the Gulf of Mexico. The company operates in three divisions: Seismic Drilling, Aviation Services; and Environmental Services. The Seismic Drilling division principally operates in the marsh, swamp, shallow water, and contiguous dry land areas along the Gulf Coast, primarily in Louisiana and Texas. It also owns and operates a fleet of seismic drilling and transportation equipment for use in the transition zone. The Aviation Services division operates company-owned and leased helicopters, and fixed-wing aircraft from bases or heliports located in the Gulf Coast regions of Louisiana. As of March 31, 2005, it operated a fleet of 20 company-owned and leased helicopters, and 1 fixed-wing aircraft. This division primarily serves geophysical companies in the United States, and oil and gas companies that operate in the shallow waters of the Gulf of Mexico. The Environmental Services division provides dock-side and offshore nonhazardous oilfield waste management and environmental cleaning services, including drilling rig, tank and vessel cleaning, safe vessel entry, naturally occurring radioactive material decontamination, platform abandonment services, pipeline flushing, gas dehydration, and hydro blasting. The company was founded in 1987 and is headquartered in Carencro, Louisiana.


Zion Oil & Gas, Inc. explores for oil and gas primarily in Israel. It holds interests in approximately 219,000 acres of preliminary permit and license areas primarily in the Joseph project located in the State of Israel. The company was founded in 2000 and is based in Dallas, Texas.


Boots & Coots International Well Control, Inc. operates as an oil and gas services company. It provides a suite of integrated oilfield services for the prevention, emergency response, and restoration of blowouts and well fires worldwide. Its prevention services include training, well plan review and intervention planning, and the development of audit and inspection programs. The company's emergency response and risk management services include risk assessment, prevention, loss mitigation, contingency planning, and continuous training and education in aspects of critical well management, as well as engineering services, such as planning and design of relief well drilling, including trajectory planning, directional control and equipment specifications, and onsite supervision of the drilling operations; planning and design of production facilities, which are susceptible to well capping or other control procedures; and mechanical and computer aided designs for well control equipment. It also offers post event services, including project management and engineering, health, safety, and environmental services, as well as pre-event engineering services, including consultation, well planning, dynamic kill modeling, and intervention planning. In addition, the company engages in the sale and rental of fire fighting equipment, such as firefighting pumps, pipe racks, Athey wagons, pipe cutters, crimping tools, and deluge safety systems, as well as provides maintenance, monitoring, updating of equipment, and ongoing consulting services. Through its participation in the insurance program WELLSURE, the company also provides lead contracting and risk management services, under critical loss scenarios to the program's insured clients. The company has strategic alliance with Halliburton Energy Services division of the Halliburton Company and with Global Special Risks, Inc. Boots & Coots International is based in Houston, Texas.


Precision Drilling Trust provides contract drilling services to the oil and gas industry in Canada. The trust provides its customers with access to an extensive fleet of drilling and service rigs, as well as a range of support services. The company was formerly known as Precision Drilling (1987), Ltd. and changed its name to Precision Drilling Corporation in 1992. It further changed its name to Precision Drilling Trust in November 2005. The trust is headquartered in Calgary, Canada.


Infinity Energy Resources, Inc., an independent energy company, through its wholly owned subsidiaries, engages in the acquisition, exploration, development, and production of natural gas and oil properties in the United States and Nicaragua. The company operates through two segments, Oil and Gas Production and Oil Field Services. The Oil and Gas Production segment's operations are principally focused in Texas and the Rocky Mountains with the exploration and development of, and production from properties in the Fort Worth, Greater Green River, and Sand Wash Basins. It also has an exploration and production prospect offshore Nicaragua. The Oil Field Services segment provides oilfield services, such as completion, fracturing, and stimulation services to oil and gas producers in the Mid-Continent region, principally including eastern Kansas and northeast Oklahoma, and the Powder River Basin in Wyoming. As of December 31, 2004, the company's total proved reserves were 8.2 billion cubic feet of gas equivalent. The company was organized in 1987. It was formerly known as Infinity, Inc. and changed its name to Infinity Energy Resources, Inc. in September 2005. The company is based in Denver, Colorado.