Company lists · Data refreshed September 2026

Top 25 Oil and gas consulting firms worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Sep 5, 2026 8,755 companies tracked

RevenueBase identified 8,755 oil and gas consulting firms worldwide as of September 2026 and tracks 271,802 professional contacts across them, including 56,563 with verified work emails and 33,266 with mobile numbers. The United States is the largest market and Houston the largest hub.

This list covers oil and gas 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 5, 2026. Country and city lists for oil and gas 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 5, 2026 86% judged on-target in blind review

8,755Companies

271,802Contacts tracked

56,563Verified emails

33,266Mobile numbers

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The 25 largest oil and gas consulting firms worldwide

Ranked by team size

Top 25 of 8,755 oil and gas consulting firms worldwide, ranked by team size, largest first. Data refreshed Sep 5, 2026. RevenueBase Smart Search rates how each company's information relates to oil and gas 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 5, 2026	10001+	53,380 contacts →
	Indirect evidence “We collaborate and engineer solutions to maximize asset value for our customers.” Source: RevenueBase Database · checked Sep 5, 2026
2	WOOD	Partial evidence	Aberdeen, United KingdomHQ checked Sep 5, 2026	10001+	26,949 contacts →
	Partial evidence “Wood is a global leader in consulting and engineering, delivering critical solutions across energy and materials markets.” Source: RevenueBase Database · checked Sep 5, 2026
3	Management Solutions	Partial evidence	Madrid, SpainHQ checked Sep 5, 2026	1,001-5,000	4,468 contacts →
	Partial evidence “Management Solutions is a leading provider of business consulting services for regulated industries.” Source: RevenueBase Database · checked Sep 5, 2026
4	PT Elnusa TBK	Strong evidence	Jakarta Selatan, IndonesiaHQ checked Sep 5, 2026	1,001-5,000	3,932 contacts →
	Strong 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 5, 2026
5	KEY Energy Services	Indirect evidence	Houston, TX, United StatesHQ checked Sep 5, 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 5, 2026
6	Oilserv	Indirect evidence	Dubai, United Arab EmiratesHQ checked Sep 5, 2026	1,001-5,000	2,249 contacts →
	Indirect 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 5, 2026
7	SAN Antonio Internacional	Indirect evidence	Comuna 1, ArgentinaHQ checked Sep 5, 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 5, 2026
8	Aarvi Encon	Strong evidence	Mumbai, IndiaHQ checked Sep 5, 2026	5,001-10,000	1,890 contacts →
	Strong evidence “Aarvi Encon has established it's leadership in providing Engineering Consultancy and Technical Assistance to Oil & Gas, Refinery, Petrochemical, Pipelines, Power & Infrastructure…” Source: RevenueBase Database · checked Sep 5, 2026
9	Tp-Otc	Strong evidence	Çankaya, TürkiyeHQ checked Sep 5, 2026	501-1,000	1,501 contacts →
	Strong 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 5, 2026
10	RENCO	Indirect evidence	Pesaro, ItalyHQ checked Sep 5, 2026	1,001-5,000	1,494 contacts →
	Indirect evidence “Renco S.p.A, an Italian company founded in 1979, is continually committed to providing its Clients with sound business solutions in an ever increasingly complex and challenging…” Source: RevenueBase Database · checked Sep 5, 2026
11	ANTON	Indirect evidence	Dubai, United Arab EmiratesHQ checked Sep 5, 2026	5,001-10,000	1,407 contacts →
	Indirect evidence “Anton Oilfield Services Group (hereinafter as “Anton”) is the world's leading integrated oilfield technology service company that provides clients with a full range of products…” Source: RevenueBase Database · checked Sep 5, 2026
12	Atwell, LLC	Partial evidence	Southfield, MI, United StatesHQ checked Sep 5, 2026	1,001-5,000	1,290 contacts →
	Partial evidence “Atwell is a full-service consulting, engineering and construction services firm that delivers a broad range of creative solutions to clients in the real estate and land…” Source: RevenueBase Database · checked Sep 5, 2026
13	Cudd Energy Services	Strong evidence	The Woodlands, TX, United StatesHQ checked Sep 5, 2026	1,001-5,000	1,285 contacts →
	Strong evidence “Cudd offers a broad range of technical and specialized oilfield services to companies engaged in the exploration and production of oil and natural gas worldwide.” Source: RevenueBase Database · checked Sep 5, 2026
14	Abraj Energy Services	Indirect evidence	Muscat, OmanHQ checked Sep 5, 2026	1,001-5,000	1,244 contacts →
	Indirect evidence “Abraj Energy Services ("Abraj"), was founded in May 2006 and has taken major strides.” Source: RevenueBase Database · checked Sep 5, 2026
15	TGS	Strong evidence	Comuna 1, ArgentinaHQ checked Sep 5, 2026	1,001-5,000	1,159 contacts →
	Strong evidence “Somos la compañía de energía lider en la prestación de servicios integrados en la industria Oil & Gas Nuestros servicios y soluciones permiten integran toda la cadena de valor del…” Source: RevenueBase Database · checked Sep 5, 2026
16	Zuhair Fayez	Strong evidence	Riyadh, Saudi ArabiaHQ checked Sep 5, 2026	1,001-5,000	1,113 contacts →
	Strong evidence “Zuhair Fayez stands as the region's foremost engineering and consulting firm, renowned for our innovative approach in architecture, project management, and oil and gas services.” Source: RevenueBase Database · checked Sep 5, 2026
17	Madina WLL	Indirect evidence	Doha, QatarHQ checked Sep 5, 2026	1,001-5,000	1,108 contacts →
	Indirect evidence “MADINA GROUP comprises of 5 standalone companies- Madina Group W.L.L, Qatar International Safety Centre, Qatar Inspection Services, Severn Glocon Qatar and Madina Oryx Engineering…” Source: RevenueBase Database · checked Sep 5, 2026
18	Barr Engineering CO	Partial evidence	Minneapolis, MN, United StatesHQ checked Sep 5, 2026	1,001-5,000	1,088 contacts →
	Partial evidence “Barr provides engineering and environmental consulting services to clients across the Midwest, throughout the Americas, and around the world.” Source: RevenueBase Database · checked Sep 5, 2026
19	Emdad Group	Strong evidence	Abu Dhabi, United Arab EmiratesHQ checked Sep 5, 2026	1,001-5,000	1,027 contacts →
	Strong evidence “Emdad LLC is a leading UAE-based service provider in the Oil & Gas sector, delivering integrated solutions that support upstream and downstream operations.” Source: RevenueBase Database · checked Sep 5, 2026
20	Sertecpet	Indirect evidence	Quito - El Coca, EcuadorHQ checked Sep 5, 2026	1,001-5,000	1,021 contacts →
	Indirect evidence “SERTECPET® is a multinational company specialized in providing worldwide Integrated Energy Solutions with state-of-the-art technology.” Source: RevenueBase Database · checked Sep 5, 2026
21	Adyard ABU Dhabi LLC	Strong evidence	Abu Dhabi, United Arab EmiratesHQ checked Sep 5, 2026	1,001-5,000	990 contacts →
	Strong evidence “Adyard is one of the United Arab Emirates (UAE) leading providers of services to the oil and gas, power, and water industries.” Source: RevenueBase Database · checked Sep 5, 2026
22	Excellence Logging	Indirect evidence	London W2 2es, United KingdomHQ checked Sep 5, 2026	1,001-5,000	933 contacts →
	Indirect evidence “Excellence Logging is an established energy services provider focused on optimizing well performance.” Source: RevenueBase Database · checked Sep 5, 2026
23	ABL	Indirect evidence	London, United KingdomHQ checked Sep 5, 2026	1,001-5,000	804 contacts →
	Indirect evidence “The Energy and Marine Consultants - an Aqualis company.” Source: RevenueBase Database · checked Sep 5, 2026
24	Bolashak Atyrau LLP & Bolashak International LTD	Strong evidence	Atyrau, KazakhstanHQ checked Sep 5, 2026	5,001-10,000	793 contacts →
	Strong evidence “Bolashak Group is a market leader in the provision of Technical & Engineering solutions to Kazakhstan’s Oil & Gas, Petrochemical, Construction, Mining, Telecommunication…” Source: RevenueBase Database · checked Sep 5, 2026
25	Pioneer Energy Services	Indirect evidence	San Antonio, TX, United StatesHQ checked Sep 5, 2026	1,001-5,000	770 contacts →
	Indirect evidence “Pioneer Energy Services is now Patterson-UTI” Source: RevenueBase Database · checked Sep 5, 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: oil and gas 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 oil and gas consulting firms.
Partial evidence: Its own public description names part of oil and gas consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name oil and gas 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 8,755 oil and gas consulting firms worldwide

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Oil and gas consulting firms worldwide at a glance

As of Sep 5, 2026

20.8%Verified-email coverage

12.2%Mobile-number coverage

31.0Average contacts per company

11-50Median size (employees)

6.5%Largest-city concentration · Houston

Sep 5, 2026Page data refreshed

Companies by employee count

1-10

4,281

11-50

2,699

51-200

1,185

201-500

332

501-1,000

120

1,001-5,000

5,001-10,000

10001+

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 oil and gas 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: 36 countries, largest first: the United States, the United Kingdom, Nigeria, Canada, Brazil, India, the United Arab Emirates, Australia, Iran, Argentina and 26 more. Country and city lists for oil and gas consulting firms are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “oil and gas 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 oil and gas 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 oil and gas 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, 56,563 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 between September 5, 2026 and September 14, 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.

Oil and gas consulting firms by location

58 lists · largest first

Every Oil and gas 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 oil and gas 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 oil and gas consulting firms are there worldwide?

RevenueBase identified 8,755 oil and gas 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 oil and gas consulting firms?

The United States leads with 2,332 companies, followed by the United Kingdom (743) and Nigeria (625). Every oil and gas consulting firms list by country and city is linked on this page.

Which city has the most oil and gas consulting firms?

Houston leads with 572 headquartered companies, followed by Calgary (324) and London (191).

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 56,563 verified decision-maker contacts tracked across these 8,755 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled from the company graph between September 5, 2026 and September 14, 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.