China

Offshore Oil Engineering Co., Ltd. provides offshore oil engineering services, including designing, construction, installation, and repair and maintenance services.  The Company's main businesses include oil/gas exploration engineering, subsea pipeline laying, oil/gas field equipment testing and maintenance, as well as pressure container and steel structure manufacturing.

Yantai Jereh Oilfield Services Group Co., Ltd develops, manufactures and sells oil field equipment.  The Company's products include well cementing equipment, well fracturing equipment, and natural gas compression and transportation equipment.

Zhongyuan Special Steel Company Ltd. produces forgings for equipment manufacturers.  The Company manufactures oil drilling tools, cast iron pipe, rollers, and die steel.

Zhongyuan Special Steel Co,Ltd. (002423 CH)

Sinopec Oilfield Service Corporation provides oilfield services. The services include geophysics, drilling engineering, logging and mud logging, special downhole operations, engineering construction, oil field service and offshore oil projects.

ZhongMan Petroleum And Natural Gas Group Corp., Ltd. offers drilling engineering services. The Company provides petroleum drilling components manufacturing, mud logging, directional drilling, cementing, and construction services. ZhongMan Petroleum and Natural Gas Group offers services in China.

ZhongMan Petroleum and Natural (603619 CH)

Changzheng Engineering Company Limited operates as a Pulverized Coal Pressurized Gasification Technology Engineering Research Center of China Petroleum and Chemical Industry. CECO specializes in gasification technology and key equipment R&D, engineering design, technical services, equipment supply and EPC services.

Sino Geophysical Company Limited engages in technical services of seismic processing and interpretation in oil exploration for oil companies. The Company also provides consultantation services on reserve volume assessment of oilfield blocks.

Apex Technology Co., Ltd. develops, produces and sales integrated circuit products and components, and computer peripherals related products. The Company also provides hardware, software services and solutions to networking products.

Suzhou Douson Drilling & Production Equipment Co., Ltd. is mainly engaged in the R&D, production, and sales of drilling equipment for oil, natural gas, and shale gas. The Company supplies well head and oil extraction equipments, well  control equipments, pipeline valves, and top drive spindles.

Sinopec Oilfield Equipment Corp manufactures and markets oil field machinery. The Company's products include rotary drilling bits for oil field and mining uses and oil field machinery parts.

Helmerich & Payne, Inc. provides contract drilling of oil and gas wells in the Gulf of Mexico and South America. The Company operates land rigs and platform rigs.

Patterson-UTI Energy, Inc. provides land-based drilling services to major and independent oil and natural gas companies.  The Company conducts drilling operations in Texas, New Mexico, Utah, Oklahoma, Louisiana, and western Canada. Patterson-UTI is also involved in pressure pumping, oil and gas exploration and production, and drilling and completion fluids services.

Archrock, Inc. operates as a natural gas contract compression services company. The Company offers natural gas compression and aftermarket services, as well as provides used equipment for oil and gas industry. Archrock serves customers in the United States.

Transocean Ltd. is an offshore drilling contractor.  The Company owns or operates mobile offshore drilling units, inland drilling barges, and other assets utilized in the support of offshore drilling activities worldwide. Transocean specializes in technically demanding segments of the offshore drilling business, including deepwater and harsh environment drilling services.

Seadrill Limited operates as an oil and gas field service company. The Company offers drilling contracting services to unlock oil and gas resources for clients across harsh and benign locations. Seadrill serves customers worldwide.

Vallourec provides tubular solutions. The Company offers tubes and other related components. Vallourec serves refineries, hydraulic cylinders, machine tools, automobiles, construction, and oil and gas industries worldwide.

Cactus, Inc. manufactures control equipment. The Company offers wellhead systems, valves, and flow control products. Cactus markets its products worldwide.

Liberty Oilfield Services Inc. operates as an oilfield service company. The Company specializes in hydraulic fracturing, stimulation, and engineering services. Liberty Oilfield Services serves customers throughout the United States.

WorleyParsons Limited provides professional services through alliance and integrated service contracts to the energy, resource and complex process industries.  The Company provides its services to industrial sectors such as oil and gas refining, petrochemicals and chemicals, minerals and metals, power and water and industrial and infrastructure.

Tidewater Inc. provides offshore supply vessels and marine support services to the offshore energy exploration, development, and production industry. The Company tows and anchor-handles mobile drilling rigs and equipment, transports supplies and personnel, and supports pipe laying and other offshore construction activities.

China Oilfield Services Limited provides oilfield services. The Company provides geophysical prospecting, drilling, oilfield technology development, and other services. China Oilfield Services also operates transportation businesses.

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