Company lists · Data refreshed October 2026

Top 25 Oil and gas drilling services worldwide

Name: Oil and gas drilling services worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Oct 19, 2026 7,548 companies tracked

RevenueBase identified 7,548 company matches for oil and gas drilling services worldwide as of October 2026 and tracks 420,626 professional contacts across them, including 71,436 with verified work emails. The United States is the largest market and Houston the largest hub.

This list covers company matches for oil and gas drilling services worldwide, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed October 19, 2026. Country and city lists for oil and gas drilling services follow the table.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list RevenueBase SmartSearch · Exact Recorded Oct 19, 2026 How this list was built

7,548Companies

420,626Contacts tracked

71,436Verified emails

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The 25 largest oil and gas drilling services worldwide

Ranked by team size

Top 25 of 7,548 company matches for oil and gas drilling services worldwide, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Oct 19, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Halliburton	Exact match	Houston, TX, United StatesHQ recorded Oct 19, 2026	10001+	56,783 contacts →
	Exact match “We collaborate and engineer solutions to maximize asset value for our customers.” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase
2	Transocean	Exact match	Zug, SwitzerlandHQ recorded Oct 19, 2026	1,001-5,000	10,599 contacts →
	Exact match “Transocean is a leading international provider of offshore contract drilling services for oil and gas wells.” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase
3	EXPRO	Exact match	Houston, TX, United StatesHQ recorded Oct 19, 2026	5,001-10,000	6,721 contacts →
	Exact match “Long recognized for extraordinary performance, superb safety and long-standing partnerships, and now incorporating Frank’s International, Expro is focused on enabling our…” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase
4	Nabors Industries	Exact match	Houston, TX, United StatesHQ recorded Oct 19, 2026	10001+	6,266 contacts →
	Exact match “Nabors Industries is a leading provider of advanced technology for the energy industry.” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase
5	Noble Corporation	Exact match	Houston, TX, United StatesHQ recorded Oct 19, 2026	5,001-10,000	5,939 contacts →
	Exact match “Noble is a leading offshore drilling contractor for the oil and gas industry.” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase
6	Seadrill	Exact match	Houston, United StatesHQ recorded Oct 19, 2026	1,001-5,000	5,065 contacts →
	Exact match “Seadrill is setting the standard in deepwater oil and gas drilling.” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase
7	PT Elnusa TBK	Exact match	Jakarta Selatan, IndonesiaHQ recorded Oct 19, 2026	1,001-5,000	4,167 contacts →
	Exact match “We are the one and only national company that possesses combined competencies in oil & gas services: seismic, drilling and oilfield.” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase
8	NESR	Exact match	Houston, United StatesHQ recorded Oct 19, 2026	5,001-10,000	3,884 contacts →
	Exact match “National Energy Services Reunited Corp.(NESR) was founded in 2017 as one of the largest national oilfield services providers in the MENA and Asia Pacific regions and was the first…” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase
9	Boart Longyear	Exact match	West Valley City, UT, United StatesHQ recorded Oct 19, 2026	5,001-10,000	3,518 contacts →
	Exact match “Established in 1890, Boart Longyear is the world’s leading innovative provider of drilling services, manufacturer of productivity-driven drilling equipment and performance…” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase
10	Valaris Limited	Exact match	Houston, TX, United StatesHQ recorded Oct 19, 2026	5,001-10,000	3,263 contacts →
	Exact match “We Are Valaris With decades of expertise and strategic commitment built on efficiency, capability and ingenuity, our sights are continually set toward a future built with purpose…” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase
11	KEY Energy Services	Exact match	Houston, TX, United StatesHQ recorded Oct 19, 2026	1,001-5,000	2,923 contacts →
	Exact match “Headquartered in Houston, Texas, Key Energy Services provides a wide array of leading edge energy production solutions and services.” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase
12	Shelf Drilling	Exact match	Dubai, United Arab EmiratesHQ recorded Oct 19, 2026	1,001-5,000	2,770 contacts →
	Exact match “Shelf Drilling is a wholly owned subsidiary of ADES Holding Company, a leading international oil and gas drilling services provider.” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase
13	Precision Drilling	Exact match	Calgary, AB, CanadaHQ recorded Oct 19, 2026	5,001-10,000	2,622 contacts →
	Exact match “Precision is a leading provider of safe and High Performance, High-Value services to the oil and gas industry.” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase
14	Patterson-Uti	Exact match	Houston, TX, United StatesHQ recorded Oct 19, 2026	10001+	2,444 contacts →
	Exact match “Patterson-UTI is a leading provider of drilling and completion services to oil and natural gas exploration and production companies in the United States and other select…” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase
15	Archer	Exact match	Sandnes, NorwayHQ recorded Oct 19, 2026	5,001-10,000	2,399 contacts →
	Exact match “Archer is a company providing drilling and well services to the global energy industry.” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase
16	Oilserv	Exact match	Dubai, United Arab EmiratesHQ recorded Oct 19, 2026	1,001-5,000	2,362 contacts →
	Exact match “OiLSERV is a provider of an expanding range of oilfield services, including well logging, well testing, production enhancement, drilling services, surface production management…” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase
17	OCYAN	Exact match	Rio De Janeiro, BrazilHQ recorded Oct 19, 2026	1,001-5,000	2,328 contacts →
	Exact match “A OCYAN atua há décadas na prestação de serviços para o setor de óleo e gás upstream, estruturando suas operações em três frentes de atuação.” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase
18	Taqa Industrialization & Energy Services Company	Exact match	Dhahran, Saudi ArabiaHQ recorded Oct 19, 2026	5,001-10,000	2,299 contacts →
	Exact match “TAQA is an international company that offers leading well solutions for the energy industry and is creating value and opportunity for all its stakeholders.” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase
19	Ensign Energy Services	Exact match	Calgary, AB, CanadaHQ recorded Oct 19, 2026	1,001-5,000	2,277 contacts →
	Exact match “Ensign Energy Services Inc.” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase
20	SAN Antonio Internacional	Exact match	Comuna 1, ArgentinaHQ recorded Oct 19, 2026	1,001-5,000	2,247 contacts →
	Exact match “Somos la mayor prestadora de servicios de perforación de la Argentina y somos líderes en la prestación de servicios asociados al mantenimiento y optimización de los pozos de…” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase
21	Sinopec International Petroleum Service Corporation	Exact match	北京市, ChinaHQ recorded Oct 19, 2026	10001+	2,112 contacts →
	Exact match “Sinopec International Petroleum Service Corporation SSC” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase
22	Egyptian Drilling Company EDC	Exact match	Cairo, EgyptHQ recorded Oct 19, 2026	5,001-10,000	2,102 contacts →
	Exact match “EDC is one of the leading drilling contractors in Egypt and the MENA region; established in 1976 in partnership with Maersk Drilling, EDC is now 100% owned by Egyptian General…” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase
23	Superior Energy Services	Exact match	Houston, TX, United StatesHQ recorded Oct 19, 2026	1,001-5,000	2,076 contacts →
	Exact match “For oil & gas exploration and production companies worldwide, Superior Energy Services is an oilfield products and services company with global reach, financial stability and…” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase
24	Arabian Drilling	Exact match	Al-khobar, Saudi ArabiaHQ recorded Oct 19, 2026	5,001-10,000	2,072 contacts →
	Exact match “We are the region’s trusted onshore and offshore oil & gas drilling company with an extensive track record of operational excellence and advanced capabilities that have enabled…” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase
25	Odfjell Drilling	Exact match	Aberdeen, United KingdomHQ recorded Oct 19, 2026	1,001-5,000	1,894 contacts →
	Exact match “Odfjell Drilling is an international drilling company with around 1,500 employees with operations around the world.” Recorded in the RevenueBase company graph · Oct 19, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “oil and gas drilling services”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 7,548 oil and gas drilling services worldwide

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Oil and gas drilling services worldwide at a glance

As of Oct 19, 2026

17.0%Verified-email coverage

55.7Average contacts per company

11-50Median size (employees)

4.5%Largest-city concentration · Houston

Oct 19, 2026Page data refreshed

Companies by employee count

1-10

2,099

11-50

2,610

51-200

1,633

201-500

614

501-1,000

246

1,001-5,000

246

5,001-10,000

10001+

Email recency is reported on each country list linked below.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
Coverage: Every country. Country and city lists for oil and gas drilling services are linked below.
What qualifies: Company records worldwide whose business descriptions match “oil and gas drilling services” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every displayed company carries at least one verified work email. RevenueBase tracks 71,436 professional contacts with verified work emails across the full matched dataset. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on October 19, 2026. Lists refresh periodically as the graph is re-checked.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Oil and gas drilling services by location

51 lists · largest first

Every Oil and gas drilling services list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “oil and gas drilling services”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many oil and gas drilling services are there worldwide?

RevenueBase identified 7,548 company matches for oil and gas drilling services worldwide as of October 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Halliburton tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which country has the most oil and gas drilling services?

The United States leads with 2,085 companies, followed by Canada (458) and Nigeria (386). Every oil and gas drilling services list by country and city is linked on this page.

Which city has the most oil and gas drilling services?

Houston leads with 343 company records, followed by Calgary (168) and Midland (131).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 71,436 professional contacts with verified work emails tracked across these 7,548 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on October 19, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase SmartSearch, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.