Baker Hughes, Inc. is a private company headquartered in Houston, TX. The firm manufactures oilfield equipment.

China National Offshore Oil Corporation, or CNOOC Group, is a major national oil company in China. It is the third-largest national oil company in the People's Republic of China, after CNPC (parent of PetroChina) and China Petrochemical Corporation (parent of Sinopec). The CNOOC Group focuses on the exploitation, exploration and development of crude oil and natural gas in offshore China. The Group is the largest producer of offshore crude oil and natural gas in China and one of the largest independent oil and gas exploration and production companies in the world. The Group mainly engages in exploration, development, production and sale of crude oil and natural gas. The Group’s core operation areas are Bohai, Western South China Sea, Eastern South China Sea and East China Sea in offshore China. Overseas, the Group has oil and gas assets in Asia, Africa, North America, South America, Oceania and Europe. As at 31 December 2015, the Group owned net proved reserves of approximately 4.32 billion BOE, and its average daily net production was 1,358,022 BOE (unless otherwise stated, all amounts of reserve and production in this report include our interests in equity method investees). The Group had total assets of approximately RMB664.4 billion.

CNOOC China Ltd. produces oil and gas in China. It provides prospecting, refinement and processing, and sale of offshore oil and natural gas products. The company also offers offshore petroleum exploration, development, production, and sales. CNOOC China was founded in 1999 and is headquartered in Beijing, China.

It was founded in 1872 as the Byron Jackson Company in Woodland, California by inventor Byron Jackson and at its peak operated in more than 50 countries worldwide. The link below from fundinguniverse.com tells how BJ was acquired by Hughes Tool and then became independent when Baker Tool bought Hughes and was recently acquired by Baker-Hughes.

CNOOC Energy Technology & Services Ltd. engages in provision of energy technology services, floating production storage and offloading (FPSO) production technology services, energy logistics services, safety, environmental protection and energy saving products and services. It operates through the following segments: energy technology services, FPSO production technology services, energy logistics services, safety, environmental protection, and energy saving. The Energy Technology Services segment provides equipment operation and maintenance, pipeline technology, engineering technology, and data information technical services. The FPSO Production Technology Service segment offers light boat services; ships and support personnel boat services; and comprehensive services such as FPSO construction, commissioning, management, towing, installation, and unloading services. The Energy Logistics Services segment focuses on providing logistics support for offshore oil and gas field exploitation through marine supplies and catering services, and assistance for oil and gas products distribution. The Safety, Environmental Protection and Energy Saving Services segment covers marine oil spill response services; industrial water treatment; human resources and training services; utilization of coatings and marine industrial protection, catalyst, and liquefied natural gas cold energy; and energy saving and environmental testing services. The company was founded on February 22, 2005 and is headquartered in Beijing, China.

PetroChina Co. Ltd. engages in the petroleum related products, services and activities. It operates through the following business segments: Exploration and Production; Refining and Chemicals; Marketing; Natural Gas and Pipeline; and Head Office and Other. The Exploration and Production segment involves exploration, development, production, and marketing of crude oil and natural gas. The Refining and Chemicals segment focuses on the refining of crude oil and petroleum products, production and marketing of primary petrochemical products, derivative petrochemical products, and other chemical products. The Marketing segment includes marketing of refined products and the trading business. The Natural Gas and Pipeline segment comprises transmission of natural gas, crude oil, and refined products and the sale of natural gas. The Head Office and Other segment relates to cash management and financing activities, the corporate center, research and development, and other business services supporting the operating business segments of the Group. The company was founded on November 5, 1999 and is headquartered in Beijing, China.

China Petrochemical Corporation (Sinopec Group) is a super-large petroleum and petrochemical enterprise group, established in July 1998 on the basis of the former China Petrochemical Corporation. Sinopec Group is a state-owned company solely invested by the state, functioning as a state-authorized investment organization in which the state holds the controlling share. Headquartered in Beijing, Sinopec Group has a registered capital of RMB 231.6 billion. The board chairman of Sinopec Group is its legal representative. Sinopec Group executes the investor rights over related state assets owned by its full subsidiaries, controlled companies and share-holding companies. These rights include receiving returns on assets, making major decisions and appointing management teams. The Group operates, manages and supervises state assets according to related laws, and shoulders the corresponding responsibility of maintaining and increasing the value of state assets. China Petroleum and Chemical Company (Sinopec Corp.), controlled by Sinopec Group, issued H-shares and A-shares at overseas and home respectively in October 2000 and August 2001 and was listed on stock markets in Hong Kong, New York, London and Shanghai. Sinopec Group’s key business activities include: industrial investment and investment management; the exploration, production, storage and transportation (including pipeline transportation), marketing and comprehensive utilization of oil and natural gas; the production, marketing, storage and transportation of coal; oil refining; the storage, transportation ,wholesale and retail of oil products; the production, marketing, storage, transportation of petrochemicals, natural gas chemicals, coal chemicals and other chemical products; the exploration, design, consulting, construction and installation of petroleum and petrochemical engineering projects; the overhaul and maintenance of petroleum and petrochemical equipments; the research and development, manufacturing and marketing of electrical and mechanical equipments; the production and marketing of electricity, steam, water and industrial gas; the research, development, application and consulting services of technology, e-business, information and alternative energy products; the import and export of self-support and agent commodity and technology; foreign project contracting, invite bidding, labor export; the international storage and logistics business. Sinopec Group ranked the 3rd in the Fortune Global 500 in 2014.

Vetco Gray, Inc. provides oil and gas drilling equipment. It offers equipment and services for onshore and offshore drilling and production, single well onshore drilling projects, multiple well deep water facilities, and subsea production systems. The company was founded on February 5, 1986 and is headquartered in Dallas, TX.

Weatherford Technology Holdings LLC engages in the provision of scientific and technological services. The company is headquartered in Houston, TX.

Topwell Petroleum Technology AG, established on 2002-03-26, Business scope includes oil and gas well drilling,Completion,overhaul,water blocking,acidification,fracture,Block channeling,Plugging service;Oil and gas extraction with well killing operations,Replacement of wellhead main control valve under pressure,Maintenance oil under pressure,gas,Maintenance of water well valves and wellhead devices,frozen work,Environmental protection and environmental protection,Operation, maintenance and guarantee of oil and gas field surface production facilities,pipeline inspection,Technology development of related technologies for petrochemical products,Technical Services,technical consulting,Technology transfer and technical training(Cannot be recruited nationwide);Downhole operation,oil test gas test,Technology Development of Coiled Tubing Operation,Technical Services,technical consulting,technology transfer;Industrial solid waste treatment,Oily Sludge Treatment,Aged oil treatment,sewage treatment,Drilling Mud Treatment,Fracturing Flowback Fluid Treatment;Research and development of oily sludge and sewage treatment equipment;Sell ​​self-produced products,petrochemical products;Provide oil and gas drilling equipment,Tool repair service;Snubbing Equipment and Accessories,Petroleum machinery and equipment,mechanical electrical equipment,water treatment equipment,Wholesale of petrochemical products,commission agent(except auction),Import and export business(Commodities that do not involve state trade management,Products involving quota license management,Apply in accordance with relevant national regulations);Machinery and Equipment Leasing.(Enterprises independently choose operating projects according to law,Carry out business activities;Items subject to approval by law,Carry out business activities in accordance with the approved content after approval by relevant departments;Do not engage in the business activities of projects prohibited and restricted by the city's industrial policies.)

China National Petroleum Corporation (CNPC) is an integrated international energy company. Based in China, we have oil and gas assets and interests in over 30 countries in Africa, Central Asia-Russia, South America, the Middle East and the Asia-Pacific. CNPC is China's largest oil and gas producer and supplier, as well as one of the world's major oilfield service providers and a globally reputed contractor in engineering construction, with businesses covering petroleum exploration & production, natural gas & pipelines, refining & marketing, oilfield services, engineering construction, petroleum equipment manufacturing and new energy development, as well as capital management, finance and insurance services. - Crude output: 110.33 million tons per year - Natural gas output: 79.86 billion cubic meters per year - Crude oil production: 53% of China's total - Natural gas production: 74% of China's total - Crude runs: 147.16 million tons per year - Domestic service stations: 19,840 - Domestic pipelines: 66,801 kilometers, including 16,369 kilometers for crude oil (nearly 67% of China's total), 40,995 kilometers for natural gas (77% of China's total) and 9,437 kilometers for refined products ( 48% of China's total) - Providing oilfield services and engineering construction in 63 countries around the world.

Solutions AS is a private company headquartered in Norway that provides technical consulting services.

Halliburton Energy Services, Inc. provides oilfield services. It offers technical products and services for petroleum, natural gas exploration and production. The company is headquartered in Houston, TX.

FMC-Tech Ltd. was set up in August 2001, for the purpose of developing a new network management system, the Crystal SystemTM, for medium voltage overhead electricity networks. The development brief was to provide a complete solution to improve customer satisfaction and meet regulatory demands both present and future, by delivering network intelligence, while at the same time reducing costs.\nThe company partnered with Vattenfall Eldistribution AB, to develop the Crystal System.\nTesting and evaluation of the system has been carried out at various stages in the project, and following the successful completion of it's product development there are now 12 sites installed in Ireland, the UK, Sweden, Poland and Malaysia.

Baoji Oilfield Machinery Co. Ltd. is a company headquartered in Baoji, China and ultimately controlled by the Government of China. The firm manufactures and distributes oilfield machinery and equipment.

Part of Schlumberger NV, Schlumberger Technologies, Inc. is a company headquartered in Moorestown, NJ, that provides oilfield services such as distributing oil and gas information technologies and providing consulting services.

Hunan Weiketuo Petroleum Technology Service Co., Ltd., established on 2010-11-29, The business scope includes the processing of petroleum machinery and equipment,Sales and technical service;Research and development of mechanical products,design;building materials,electronic product,Sales of instrumentation.(Involving administrative licensing, with operating permits)

Shenzhen Fluid Science & Technology Co. Ltd. is a Chinese private company located in Shenzhen that provides oilfield service equipment. Shenzhen Fluid Science & Technology Co. Ltd. acquired Shenzhen Fluid Science & Technology Co. Ltd. from Petro-king Oilfield Services Ltd.

CNPC Chuanqing Drilling Engineering Co., Ltd., established on 2008-07-18, Business scope includes general items:Engineering and Technology Research and Experimental Development;Mineral dressing;Engage in investment activities with own funds;Technical Services,technology development,technical consulting,Technology Exchange,technology transfer,Technology Promotion;Engineering technical service(planning management,survey,design,Except supervision);Oil and Gas Technical Services;Industrial Internet Data Service;data processing services;Data processing and storage support services;software development;Information system operation and maintenance services;Information Technology Consulting Services;Resource recycling technology research and development;Soil Pollution Control and Restoration Services;Environmental emergency management service;Environmental Protection Monitoring;Eco-environmental material manufacturing[Branch operation];Water Environment Pollution Prevention and Control Services;Atmospheric Environmental Pollution Prevention and Control Services;Soil Environmental Pollution Prevention and Control Services;Solid Waste Treatment;Import and export;Import and export agency;Technology Import and Export;Foreign contracted projects;Refined oil wholesale(Free of Hazardous Chemicals);Lubricant sales;Chemical product sales(No licensed chemical products);Sales of office equipment consumables;Fire Equipment Sales;Sales of labor protection products;Auto New Car Sales;Machinery sales;Mechanical Parts,Parts sales;Sales of special equipment for oil drilling;Special Equipment Sales;Petroleum product sales(Free of Hazardous Chemicals);electronics sales;internet sales(Except for products that require a license for sale);software sales;Auto Parts Retail;sales agent;Information security equipment sales;Security equipment sales;Catering Management;Land use right lease;housing lease;Non-residential real estate leases;Machinery and Equipment Leasing;Small and mini bus rental business service;emergency services;Safety technical training for special operators;business training(Does not include education and training,Vocational skills training and other licensed training);Unit logistics management service;Manufacturing of Specialty Chemical Products(Free of Hazardous Chemicals)[Branch operation];Manufacture of non-metallic mineral products[Branch operation];R&D of metal products;General equipment manufacturing(Does not include special equipment manufacturing)[Branch operation];Manufacturing of special equipment(Manufacture of licensed professional equipment not included)[Branch operation];Instrument Manufacturing[Branch operation];Metalwork Repair;Mechanical equipment research and development;General Equipment Repair;Domestic Freight Forwarding;Domestic container cargo transportation agency;Loading and unloading;Storage equipment rental service;Operation of Road Freight Transport Station;International Freight Forwarding;Environmental protection special equipment sales;property management;Motor Vehicle Repair and Maintenance(Except for projects subject to approval by law,Carry out business activities independently in accordance with the law with a business license).licensed items:Indoor environment detection;accommodation service;Catering Services;Gas operation;Water production and supply;road freight transport(Does not contain dangerous goods);Construction Engineering Construction(Items subject to approval by law,Business activities can only be carried out after approval by relevant departments,The specific business items are subject to the approval documents or licenses of relevant departments).