Company lists · Data refreshed September 2026

Top 25 Oil and gas consulting companies worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 8,719 companies tracked

RevenueBase identified 8,719 oil and gas consulting companies worldwide as of September 2026 and tracks 264,007 professional contacts across them, including 46,603 with verified work emails. The United States is the largest market and Houston the largest hub.

This list covers oil and gas consulting companies 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 21, 2026. Country and city lists for oil and gas consulting companies 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 21, 2026 86% judged on-target in blind review

8,719Companies

264,007Contacts tracked

46,603Verified emails

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The 25 largest oil and gas consulting companies worldwide

Ranked by team size

Top 25 of 8,719 oil and gas consulting companies worldwide, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to oil and gas consulting companies: 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 21, 2026	10001+	53,380 contacts →
	Indirect evidence “We collaborate and engineer solutions to maximize asset value for our customers.” Source: RevenueBase Database · checked Sep 21, 2026
2	Aker Solutions	Indirect evidence	Fornebu, NorwayHQ checked Sep 21, 2026	10001+	15,774 contacts →
	Indirect evidence “Aker Solutions is a global engineering and technology company known for delivering complex energy projects with trusted quality and predictable results.” Source: RevenueBase Database · checked Sep 21, 2026
3	PT Elnusa TBK	Strong evidence	Jakarta Selatan, IndonesiaHQ checked Sep 21, 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 21, 2026
4	KEY Energy Services	Indirect evidence	Houston, TX, United StatesHQ checked Sep 21, 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 21, 2026
5	Oilserv	Indirect evidence	Dubai, United Arab EmiratesHQ checked Sep 21, 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 21, 2026
6	OIL States International	Partial evidence	Houston, TX, United StatesHQ checked Sep 21, 2026	5,001-10,000	2,215 contacts →
	Partial evidence “Oil States International, Inc.” Source: RevenueBase Database · checked Sep 21, 2026
7	Sinopec International Petroleum Service Corporation	Indirect evidence	北京市, ChinaHQ checked Sep 21, 2026	10001+	1,952 contacts →
	Indirect evidence “Sinopec International Petroleum Service Corporation SSC” Source: RevenueBase Database · checked Sep 21, 2026
8	Aarvi Encon	Strong evidence	Mumbai, IndiaHQ checked Sep 21, 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 21, 2026
9	TGS	Indirect evidence	Houston, TX, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,775 contacts →
	Indirect evidence “TGS provides advanced data and intelligence to companies active in the energy sector.” Source: RevenueBase Database · checked Sep 21, 2026
10	Tp-Otc	Strong evidence	Çankaya, TürkiyeHQ checked Sep 21, 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 21, 2026
11	Core Laboratories	Partial evidence	Houston, TX, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,500 contacts →
	Partial evidence “With over 70 offices in more than 50 countries located in major oil-producing provinces, Core Laboratories provides services to the world's major, national, and independent oil…” Source: RevenueBase Database · checked Sep 21, 2026
12	RENCO	Indirect evidence	Pesaro, ItalyHQ checked Sep 21, 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 21, 2026
13	ANTON	Indirect evidence	Dubai, United Arab EmiratesHQ checked Sep 21, 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 21, 2026
14	Cudd Energy Services	Strong evidence	The Woodlands, TX, United StatesHQ checked Sep 21, 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 21, 2026
15	Waha OIL Company	Strong evidence	LibyaHQ checked Sep 21, 2026	1,001-5,000	1,282 contacts →
	Strong evidence “oil and gas” Source: RevenueBase Database · checked Sep 21, 2026
16	Abraj Energy Services	Indirect evidence	Muscat, OmanHQ checked Sep 21, 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 21, 2026
17	AL Turki Enterprises L.L.C	Strong evidence	United StatesHQ checked Sep 21, 2026	1,001-5,000	1,226 contacts →
	Strong evidence “At Al Turki’s Oil and Gas Division, we carry out multi-disciplined Engineering Design, Procurement and Construction service in the southern region of Oman with our Off-plot…” Source: RevenueBase Database · checked Sep 21, 2026
18	Hunting	Strong evidence	London, United KingdomHQ checked Sep 21, 2026	1,001-5,000	1,211 contacts →
	Strong evidence “HUNTING is an energy services provider to the world's leading national and international oil and gas companies, manufacturing and distributing products that enable the extraction…” Source: RevenueBase Database · checked Sep 21, 2026
19	TGS	Strong evidence	Comuna 1, ArgentinaHQ checked Sep 21, 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 21, 2026
20	Zuhair Fayez	Strong evidence	Riyadh, Saudi ArabiaHQ checked Sep 21, 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 21, 2026
21	Madina WLL	Indirect evidence	Doha, QatarHQ checked Sep 21, 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 21, 2026
22	Queiroz Galvão Óleo E GÁS S.A	Indirect evidence	BrazilHQ checked Sep 21, 2026	1,001-5,000	1,069 contacts →
	Indirect evidence “A Queiroz Galvão Óleo e Gás (QGOG) é a maior companhia privada de prestação de serviços de perfuração e produção do Brasil.” Source: RevenueBase Database · checked Sep 21, 2026
23	Emdad Group	Strong evidence	Abu Dhabi, United Arab EmiratesHQ checked Sep 21, 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 21, 2026
24	Sertecpet	Indirect evidence	Quito - El Coca, EcuadorHQ checked Sep 21, 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 21, 2026
25	Carso Perforación	Indirect evidence	United StatesHQ checked Sep 21, 2026	1,001-5,000	994 contacts →
	Indirect evidence “Empresa líder en el Sector Petrolero, con presencia a Nivel Nacional, principales clientes PEMEX Y CFE, con servicios como perforación de pozos terrestres, Marinos, Geotérmicos…” Source: RevenueBase Database · checked Sep 21, 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 companies. 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 companies.
Partial evidence: Its own public description names part of oil and gas consulting companies, 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 companies. 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 8,719 oil and gas consulting companies worldwide

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Oil and gas consulting companies worldwide at a glance

As of Sep 21, 2026

17.7%Verified-email coverage

30.3Average contacts per company

11-50Median size (employees)

5.3%Largest-city concentration · Houston

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

3,996

11-50

2,695

51-200

1,279

201-500

404

501-1,000

142

1,001-5,000

127

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 oil and gas consulting companies, 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 oil and gas consulting companies are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “oil and gas consulting companies”. 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 companies), 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 companies, 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, 46,603 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 21, 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 companies by location

45 lists · largest first

Every Oil and gas consulting companies 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 companies, 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 companies are there worldwide?

RevenueBase identified 8,719 oil and gas consulting companies 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 companies?

The United States leads with 1,743 companies, followed by the United Kingdom (596) and Nigeria (578). Every oil and gas consulting companies list by country and city is linked on this page.

Which city has the most oil and gas consulting companies?

Houston leads with 461 headquartered companies, followed by Calgary (245) and Port Harcourt (157).

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 46,603 verified decision-maker contacts tracked across these 8,719 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 21, 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.