Company lists · Data refreshed September 2026

Top 25 Oil gas consulting firms worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 15,351 companies tracked

RevenueBase identified 15,351 oil gas consulting firms worldwide as of September 2026 and tracks 430,848 professional contacts across them, including 84,750 with verified work emails. The United States is the largest market and Houston the largest hub.

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

15,351Companies

430,848Contacts tracked

84,750Verified emails

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The 25 largest oil gas consulting firms worldwide

Ranked by team size

Top 25 of 15,351 oil gas consulting firms worldwide, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to oil 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 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	WOOD	Partial evidence	Aberdeen, United KingdomHQ checked Sep 21, 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 21, 2026
3	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
4	Bilfinger	Indirect evidence	Mannheim, GermanyHQ checked Sep 21, 2026	10001+	4,035 contacts →
	Indirect evidence “Bilfinger is an international industrial services provider with a vision to be the No.” Source: RevenueBase Database · checked Sep 21, 2026
5	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
6	Ortec Group	Indirect evidence	Aix-en-provence, FranceHQ checked Sep 21, 2026	10001+	3,436 contacts →
	Indirect evidence “En conjuguant depuis sa création audace et rigueur, le groupe Ortec est devenu aujourd’hui un des leaders des services à l’industrie, l’énergie et l’environnement.” Source: RevenueBase Database · checked Sep 21, 2026
7	دار الرياض DAR AL Riyadh	Indirect evidence	Riyadh, Saudi ArabiaHQ checked Sep 21, 2026	1,001-5,000	2,720 contacts →
	Indirect evidence “Founded in the mid-1970s by Prince Turki bin Abdullah bin Abdulrahman Al Saud, a forward-thinking engineering pioneer, Dar Al Riyadh has evolved into the Kingdom's leading…” Source: RevenueBase Database · checked Sep 21, 2026
8	SRK Consulting	Partial evidence	Vancouver, CanadaHQ checked Sep 21, 2026	1,001-5,000	2,259 contacts →
	Partial evidence “SRK Consulting is an independent, international group providing specialised consultancy services.” Source: RevenueBase Database · checked Sep 21, 2026
9	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
10	J.S. Held LLC	Indirect evidence	Jericho, NY, PalestineHQ checked Sep 21, 2026	1,001-5,000	1,954 contacts →
	Indirect evidence “J.S.” Source: RevenueBase Database · checked Sep 21, 2026
11	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
12	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
13	Pt. Surveyor Indonesia	Indirect evidence	IndonesiaHQ checked Sep 21, 2026	1,001-5,000	1,537 contacts →
	Indirect evidence “Surveyor Indonesia was incepted on 1 August 1991.” Source: RevenueBase Database · checked Sep 21, 2026
14	Chiyoda Corporation	Strong evidence	Yokohama, JapanHQ checked Sep 21, 2026	5,001-10,000	1,514 contacts →
	Strong evidence “Since its establishment in 1948, Chiyoda's business field has covered the energy sector such as oil and gas industry including energy conservation, and chemicals, environment…” Source: RevenueBase Database · checked Sep 21, 2026
15	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
16	Vulcain Engineering Group	Partial evidence	Neuilly-sur-seine, FranceHQ checked Sep 21, 2026	5,001-10,000	1,496 contacts →
	Partial evidence “Vulcain Engineering Group is a multi-specialist engineering and consulting group serving industrial companies across the globe, focused on critical sectors: energy, health…” Source: RevenueBase Database · checked Sep 21, 2026
17	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
18	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
19	Partner Engineering & Science, INC	Indirect evidence	Torrance, CA, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,358 contacts →
	Indirect evidence “Partner Assessment Corp.” Source: RevenueBase Database · checked Sep 21, 2026
20	Atwell, LLC	Partial evidence	Southfield, MI, United StatesHQ checked Sep 21, 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 21, 2026
21	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
22	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
23	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
24	Knight Piesold	Partial evidence	Denver, CO, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,231 contacts →
	Partial evidence “Knight Piésold is an employee-owned, global consulting firm providing specialist services to the mining, power, water resources, and infrastructure industries.” Source: RevenueBase Database · checked Sep 21, 2026
25	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

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 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 gas consulting firms.
Partial evidence: Its own public description names part of oil 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 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 15,351 oil gas consulting firms worldwide

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Oil gas consulting firms worldwide at a glance

As of Sep 21, 2026

19.7%Verified-email coverage

28.1Average contacts per company

1-10Median size (employees)

3.7%Largest-city concentration · Houston

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

7,687

11-50

4,560

51-200

1,969

201-500

601

501-1,000

225

1,001-5,000

187

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 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: Every country. Country and city lists for oil gas consulting firms are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “oil 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 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 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, 84,750 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 gas consulting firms by location

68 lists · largest first

Every Oil 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 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 gas consulting firms are there worldwide?

RevenueBase identified 15,351 oil 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 gas consulting firms?

The United States leads with 2,368 companies, followed by the United Kingdom (1,105) and Brazil (756). Every oil gas consulting firms list by country and city is linked on this page.

Which city has the most oil gas consulting firms?

Houston leads with 574 headquartered companies, followed by Calgary (321) and London (290).

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 84,750 verified decision-maker contacts tracked across these 15,351 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.