Company lists · Data refreshed September 2026

Top 25 Drilling operations consulting firms worldwide

Name: Drilling operations consulting firms worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 10,367 companies tracked

RevenueBase identified 10,367 drilling operations consulting firms worldwide as of September 2026 and tracks 361,647 professional contacts across them, including 71,593 with verified work emails. The United States is the largest market and Houston the largest hub.

This list covers drilling operations consulting firms worldwide, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 28, 2026. Country and city lists for drilling operations consulting firms follow the table.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, 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 HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 28, 2026 86% judged on-target in blind review

10,367Companies

361,647Contacts tracked

71,593Verified emails

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The 25 largest drilling operations consulting firms worldwide

Ranked by team size

Top 25 of 10,367 drilling operations consulting firms worldwide, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to drilling operations consulting firms: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Halliburton	Indirect evidence	Houston, TX, United StatesHQ checked Sep 28, 2026	10001+	53,380 contacts →
	Indirect evidence “We collaborate and engineer solutions to maximize asset value for our customers.” Source: RevenueBase Database · checked Sep 28, 2026
2	Transocean	Partial evidence	Zug, SwitzerlandHQ checked Sep 28, 2026	1,001-5,000	10,068 contacts →
	Partial evidence “Transocean is a leading international provider of offshore contract drilling services for oil and gas wells.” Source: RevenueBase Database · checked Sep 28, 2026
3	EXPRO	Indirect evidence	Houston, TX, United StatesHQ checked Sep 28, 2026	5,001-10,000	6,466 contacts →
	Indirect evidence “Long recognized for extraordinary performance, superb safety and long-standing partnerships, and now incorporating Frank’s International, Expro is focused on enabling our…” Source: RevenueBase Database · checked Sep 28, 2026
4	Nabors Industries	Indirect evidence	Houston, TX, United StatesHQ checked Sep 28, 2026	10001+	5,865 contacts →
	Indirect evidence “Nabors Industries is a leading provider of advanced technology for the energy industry.” Source: RevenueBase Database · checked Sep 28, 2026
5	Seadrill	Partial evidence	Houston, United StatesHQ checked Sep 28, 2026	1,001-5,000	4,845 contacts →
	Partial evidence “Seadrill is setting the standard in deepwater oil and gas drilling.” Source: RevenueBase Database · checked Sep 28, 2026
6	PT Elnusa TBK	Partial evidence	Jakarta Selatan, IndonesiaHQ checked Sep 28, 2026	1,001-5,000	3,932 contacts →
	Partial evidence “We are the one and only national company that possesses combined competencies in oil & gas services: seismic, drilling and oilfield.” Source: RevenueBase Database · checked Sep 28, 2026
7	NESR	Indirect evidence	Houston, United StatesHQ checked Sep 28, 2026	5,001-10,000	3,683 contacts →
	Indirect evidence “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…” Source: RevenueBase Database · checked Sep 28, 2026
8	Boart Longyear	Partial evidence	West Valley City, UT, United StatesHQ checked Sep 28, 2026	5,001-10,000	3,285 contacts →
	Partial evidence “Established in 1890, Boart Longyear is the world’s leading innovative provider of drilling services, manufacturer of productivity-driven drilling equipment and performance…” Source: RevenueBase Database · checked Sep 28, 2026
9	ADES	Partial evidence	Al Khobar, Saudi ArabiaHQ checked Sep 28, 2026	5,001-10,000	3,251 contacts →
	Partial evidence “ADES is a world-leading international provider of oil and gas drilling services.” Source: RevenueBase Database · checked Sep 28, 2026
10	Valaris Limited	Indirect evidence	Houston, TX, United StatesHQ checked Sep 28, 2026	5,001-10,000	3,173 contacts →
	Indirect evidence “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…” Source: RevenueBase Database · checked Sep 28, 2026
11	KEY Energy Services	Indirect evidence	Houston, TX, United StatesHQ checked Sep 28, 2026	1,001-5,000	2,755 contacts →
	Indirect evidence “Headquartered in Houston, Texas, Key Energy Services provides a wide array of leading edge energy production solutions and services.” Source: RevenueBase Database · checked Sep 28, 2026
12	Shelf Drilling	Partial evidence	Dubai, United Arab EmiratesHQ checked Sep 28, 2026	1,001-5,000	2,689 contacts →
	Partial evidence “Shelf Drilling is a wholly owned subsidiary of ADES Holding Company, a leading international oil and gas drilling services provider.” Source: RevenueBase Database · checked Sep 28, 2026
13	Precision Drilling	Indirect evidence	Calgary, AB, CanadaHQ checked Sep 28, 2026	5,001-10,000	2,471 contacts →
	Indirect evidence “Precision is a leading provider of safe and High Performance, High-Value services to the oil and gas industry.” Source: RevenueBase Database · checked Sep 28, 2026
14	Archer	Partial evidence	Sandnes, NorwayHQ checked Sep 28, 2026	5,001-10,000	2,373 contacts →
	Partial evidence “Archer is a company providing drilling and well services to the global energy industry.” Source: RevenueBase Database · checked Sep 28, 2026
15	Patterson-Uti	Partial evidence	Houston, TX, United StatesHQ checked Sep 28, 2026	10001+	2,317 contacts →
	Partial evidence “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…” Source: RevenueBase Database · checked Sep 28, 2026
16	Oilserv	Partial evidence	Dubai, United Arab EmiratesHQ checked Sep 28, 2026	1,001-5,000	2,249 contacts →
	Partial evidence “OiLSERV is a provider of an expanding range of oilfield services, including well logging, well testing, production enhancement, drilling services, surface production management…” Source: RevenueBase Database · checked Sep 28, 2026
17	Ensign Energy Services	Indirect evidence	Calgary, AB, CanadaHQ checked Sep 28, 2026	1,001-5,000	2,176 contacts →
	Indirect evidence “Ensign Energy Services Inc.” Source: RevenueBase Database · checked Sep 28, 2026
18	Egyptian Drilling Company EDC	Partial evidence	Cairo, EgyptHQ checked Sep 28, 2026	5,001-10,000	2,122 contacts →
	Partial evidence “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…” Source: RevenueBase Database · checked Sep 28, 2026
19	Constellation OIL Services	Partial evidence	Rio De Janeiro, BrazilHQ checked Sep 28, 2026	1,001-5,000	2,075 contacts →
	Partial evidence “Constellation Oil Services is a drilling contractor highly differentiated due to its unique experience in deep and ultra-deepwater drilling.” Source: RevenueBase Database · checked Sep 28, 2026
20	SAN Antonio Internacional	Indirect evidence	Comuna 1, ArgentinaHQ checked Sep 28, 2026	1,001-5,000	2,064 contacts →
	Indirect evidence “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…” Source: RevenueBase Database · checked Sep 28, 2026
21	Arabian Drilling	Strong evidence	Al-khobar, Saudi ArabiaHQ checked Sep 28, 2026	5,001-10,000	2,042 contacts →
	Strong evidence “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…” Source: RevenueBase Database · checked Sep 28, 2026
22	Superior Energy Services	Indirect evidence	Houston, TX, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,938 contacts →
	Indirect evidence “For oil & gas exploration and production companies worldwide, Superior Energy Services is an oilfield products and services company with global reach, financial stability and…” Source: RevenueBase Database · checked Sep 28, 2026
23	Maersk Drilling	Partial evidence	Kongens Lyngby, DenmarkHQ checked Sep 28, 2026	1,001-5,000	1,816 contacts →
	Partial evidence “Noble Corporation today announced that the business combination Maersk Drilling has been successfully completed.” Source: RevenueBase Database · checked Sep 28, 2026
24	Tp-Otc	Partial evidence	Çankaya, TürkiyeHQ checked Sep 28, 2026	501-1,000	1,501 contacts →
	Partial evidence “TP-OTC is established to provide all engineering and technology services for offshore operations in oil and gas industry.” Source: RevenueBase Database · checked Sep 28, 2026
25	Major Drilling	Partial evidence	Moncton, NB, CanadaHQ checked Sep 28, 2026	1,001-5,000	1,447 contacts →
	Partial evidence “Major Drilling Group International Inc.” Source: RevenueBase Database · checked Sep 28, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: drilling operations consulting firms. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names drilling operations consulting firms.
Partial evidence: Its own public description names part of drilling operations consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name drilling operations consulting firms. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 10,367 drilling operations consulting firms worldwide

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Drilling operations consulting firms worldwide at a glance

As of Sep 28, 2026

19.8%Verified-email coverage

34.9Average contacts per company

11-50Median size (employees)

4.5%Largest-city concentration · Houston

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

4,681

11-50

3,214

51-200

1,513

201-500

514

501-1,000

207

1,001-5,000

158

5,001-10,000

10001+

Email recency is reported on each country list linked below.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among drilling operations consulting firms, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
Coverage: Every country. Country and city lists for drilling operations consulting firms are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “drilling operations consulting firms”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names drilling operations consulting firms), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among drilling operations consulting firms, and records with no verified work email.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
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 listed company carries at least one verified work email, 71,593 across the full list. 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 September 28, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Drilling operations consulting firms by location

56 lists · largest first

Every Drilling operations consulting firms 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 Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names drilling operations consulting firms, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many drilling operations consulting firms are there worldwide?

RevenueBase identified 10,367 drilling operations consulting firms worldwide as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Halliburton, headquartered in Houston, tops this list with the largest team on record.

Which country has the most drilling operations consulting firms?

The United States leads with 2,099 companies, followed by Canada (720) and the United Kingdom (534). Every drilling operations consulting firms list by country and city is linked on this page.

Which city has the most drilling operations consulting firms?

Houston leads with 467 headquartered companies, followed by Calgary (265) and Perth (113).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 71,593 verified decision-maker contacts tracked across these 10,367 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 28, 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 Smart Search, 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.