Schlumberger Limited is the world's largest oil and gas services corporation. Nearly 126,000 people work for the firm, who come from more than 140 nations and operate in more than 80 countries throughout the world. The headquarters of the corporation are in Paris, Houston, London, and La Hay.

Schlumberger was founded on the premise that if an electric field could be produced under the surface, voltage measurements at the surface could be mapped to show subsurface structure. In 1912, using extremely primitive technology, the first map of equipotential curves was recorded after two years of lab and field research. The results validated the approach while showing subterranean characteristics including bed borders and formation layer dip directions. This was critical because the approach gave additional data that might be valuable in detecting subsurface structures that form traps for minerals like oil and gas.

It derives from a shared sense of purpose among Schlumberger employees, who represent more than 160 nationalities and deliver leading digital solutions and implement ground-breaking technologies to allow the global energy industry's performance and sustainability.

They engage with clients in close cooperation to produce industry-changing solutions that enable cleaner, safer access to energy for every community - including those they live and work in - with experience in more than 120 countries.

Website: https://www.slb.com/
Headquarter: Houston, Texas, USA

Annual revenue: $30 billion

Halliburton is one of the world's major suppliers of products and services for the oil industry's ever-changing demands.

Halliburton was founded in 1919 and serves major, national, and independent oil and natural gas industries all over the world. Halliburton's 40,000 worldwide workers collaborate and design solutions to help its clients get the most out of their assets. Continuous improvement is at the heart of the execution culture. They are guided by their ideals to achieve more in their interactions with one another and with everyone else.

Their professionals collaborate and design solutions to help clients get the most out of their reservoirs throughout its life cycle. They help their customers with hydrocarbons location, geological data management, drilling and formation appraisal, well building and completion, and production optimization throughout the life of their asset by combining technology, services, and execution skills.

Website: https://www.halliburton.com/

Headquarter: Houston, Texas, USA and Dubai, UAE

Annual revenue: $20 billion

Fluor Corporation improves the world by bringing world-class knowledge to bear on its clients' most difficult problems. Fluor's 44,000 workers provide professional and technical solutions to customers across the world, ensuring that projects are safe, well-executed, and cost-effective. Fluor was placed 196 on the Fortune 500 list of the world's top corporations in 2021. Fluor has been providing engineering, procurement, and construction services for more than 100 years, with headquarters in Irving, Texas.

Fluor has been offering professional and technical solutions to clients all over the world for over a century, ensuring safe, well-executed, and cost-effective projects.

Fluor delivers professional and technical solutions to clients all over the world in order to produce safe, well-executed, capital-efficient engineering, procurement, and construction (EPC) projects.

Website: https://www.fluor.com/

Headquarter: Grapevine, Texas, United States

Annual revenue: $19.5 billion

Baker Hughes is a multinational industrial services company based in the United States that is one of the world's largest oil field services firms. The firm offers products and services for oil drilling, formation evaluation, completion, production, and reservoir consultancy to the oil and gas sector. Baker Hughes is based in Houston and was founded in Delaware. Baker Hughes Incorporated was the company's original name until it combined with GE Oil and Gas in 2017 to form Baker Hughes, a GE Company (BHGE), and then it divested from General Electric in 2019 to become Baker Hughes Company. GE no longer owns a majority of Baker Hughes, holding only 30% as of December 2020, and plans to sell the remaining 30% over the next few years.

They create and deploy cutting-edge technology for energy and industrial industries seeking more efficient, dependable, and environmentally friendly solutions. Today's and tomorrow's industries are being transformed by a varied array of technology and solutions.

Website: https://www.bakerhughes.com/
Headquarter: Houston, Texas, U.S.

Annual revenue: $17 billion

T.S. Stoney Stoneman started his career as a draftsman and then a landman before joining the Danciger Oil & Refining Company in Fort Worth, Texas in 1926.

Mr. Stoneman purchased the company's first drilling rig with a personal cheque, which he claimed on his expenditure report. With The Offshore Company, he would subsequently play major leadership roles in pioneering offshore drilling.

Transocean employs over 25,000 people globally and is currently building 139 oil rigs and three extreme deep drilling complexes. The company's headquarters are in Vernier, near Geneva, and it has offices in 20 countries, including Switzerland, the United States, Norway, Scotland, Brazil, Indonesia, and Malaysia.

To safeguard and maintain its personnel offshore and onshore healthy and safe, Transocean is closely monitoring and implementing recommendations offered by the World Health Organization (WHO) and the Centers for Disease Control and Prevention (CDC).

Website: https://www.deepwater.com/

Headquarter: Turmstrasse 30, CH-6312 Steinhausen, Switzerland

Annual revenue: $7 billion

Valaris plc is a UK-based offshore drilling firm with headquarters in Houston, Texas. It has 61 rigs, including 45 offshore jackup rigs, 11 drillships, and 5 semi-submersible platform drilling rigs, making it the world's largest offshore drilling and well drilling firm.

Their sights are set on a bright future, one created with purpose and supported by the world's most technologically sophisticated offshore drilling operations, thanks to decades of expertise and a commitment to efficiency, capability, and innovation.

Operating on six continents, their constant commitment to safety and quality has helped them become the industry leader in customer satisfaction, a monument to their workers' hard work and devotion throughout the world. Valaris' main goal is to provide ethical energy delivery solutions across the world. Their mission is the driving factor that distinguishes them as a leader in their field.

The rig fleet, which includes ultra-deepwater drillships, adaptable semisubmersibles, and contemporary shallow-water jackups, can accommodate a wide range of client well program needs. Its rig fleet is among the most technologically sophisticated in the business, and their well-trained employees excel in the most difficult offshore settings.

Website: https://www.valaris.com/home/default.aspx

Headquarter: London, United Kingdom (incorporation)
San Felipe Plaza, Houston, Texas, USA (operational)

Annual revenue: $1.8 billion

In the early 1960s, Brewster-Bartle, an onshore drilling company, filed bankruptcy. In 1964, Don McMahon acquired Brewster-Bartle from its bank creditors and formed Diamond M Drilling Company, named after Diamond M Acres, his ranch near Simonton, Texas, which then expanded into offshore drilling.

Diamond Offshore is a global leader in offshore drilling, with a fleet of 13 offshore drilling rigs, including nine semisubmersibles and four dynamically positioned drillships, offering contract drilling services to the oil industry all over the world.

Diamond Offshore can trace its roots all the way back to the beginnings of the offshore drilling business. Decades of innovation, many rig and company acquisitions, and an uncompromising dedication to safety are the chapters of Diamond Offshore's history that characterize them as a world leader in offshore drilling.

Diamond Offshore's fleet of offshore drilling rigs now includes nine semisubmersibles and four ultra-deepwater drillships that are in service across the world.

Website: http://www.diamondoffshore.com/

Headquarter: Katy, Texas, U.S.

Annual revenue: $1.5 billion

Noble Corporation is a British offshore drilling contractor based in London. Noble Corporation, a subsidiary, is based in the Cayman Islands. It is the successor company of Noble Drilling Corporation.

In 1921, a single rig operation was established. Noble has now evolved to become one of the world's largest offshore drilling contractors during the previous century. The final outcome of a long-term commitment to its industry and clients is their development and durability. Their team is the driving force behind this. Noble has positioned itself to consistently offer the best level of service and performance by instilling their core principles and "Trusted Partner" ethos.

Noble's values help to form the company's culture and define who they are. Lloyd Noble, the company's founder, established a people-first legacy a century ago, and that attitude is still in place today. Their common dedication to one another and to Noble's basic beliefs has resulted in a distinct culture that can be found on every Noble rig throughout the world.

Website: https://www.noblecorp.com/home/default.aspx

Headquarter: Sugar Land, Texas, United States

Annual revenue: $1.2 billion

Seadrill is a petroleum sector deepwater drilling contractor. For tax reasons, it is incorporated in Bermuda and run from London and Houston. Semi-submersible platforms, jackup rigs, and drillships are among the company's assets.

John Fredriksen, a Norwegian-born shipping magnate, established Seadrill as a Bermuda corporation on May 10, 2005, and it was listed on the Oslo Stock Exchange in November 2005.

They are establishing the standard in offshore drilling from shallow to ultra-deep water, in both harsh and benign conditions. They assist customers securely access oil and gas resources, allowing them to transmit energy throughout the world.

Website: https://www.seadrill.com/

Headquarter: Hamilton, Bermuda (Incorporated),

Houston, United States (operational)

London, United Kingdom (Global)

Annual revenue: $1 billion