Company lists · Data refreshed September 2026

Top 25 Petroleum consulting firms worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Sep 29, 2026 7,454 companies tracked

RevenueBase identified 7,454 petroleum consulting firms worldwide as of September 2026 and tracks 300,409 professional contacts across them, including 67,793 with verified work emails. The United States is the largest market and Houston the largest hub.

This list covers petroleum 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 29, 2026. Country and city lists for petroleum 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 29, 2026 86% judged on-target in blind review

7,454Companies

300,409Contacts tracked

67,793Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest petroleum consulting firms worldwide

Ranked by team size

Top 25 of 7,454 petroleum consulting firms worldwide, ranked by team size, largest first. Data refreshed Sep 29, 2026. RevenueBase Smart Search rates how each company's information relates to petroleum 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 29, 2026	10001+	53,380 contacts →
	Indirect evidence “We collaborate and engineer solutions to maximize asset value for our customers.” Source: RevenueBase Database · checked Sep 29, 2026
2	NOV	Indirect evidence	Houston, TX, United StatesHQ checked Sep 29, 2026	10001+	29,577 contacts →
	Indirect evidence “NOV delivers technology-driven solutions to empower the global energy industry.” Source: RevenueBase Database · checked Sep 29, 2026
3	WOOD	Partial evidence	Aberdeen, United KingdomHQ checked Sep 29, 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 29, 2026
4	Aker Solutions	Indirect evidence	Fornebu, NorwayHQ checked Sep 29, 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 29, 2026
5	PT Elnusa TBK	Indirect evidence	Jakarta Selatan, IndonesiaHQ checked Sep 29, 2026	1,001-5,000	3,932 contacts →
	Indirect 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 29, 2026
6	Ortec Group	Indirect evidence	Aix-en-provence, FranceHQ checked Sep 29, 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 29, 2026
7	KEY Energy Services	Indirect evidence	Houston, TX, United StatesHQ checked Sep 29, 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 29, 2026
8	SRK Consulting	Partial evidence	Vancouver, CanadaHQ checked Sep 29, 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 29, 2026
9	Sinopec International Petroleum Service Corporation	Partial evidence	北京市, ChinaHQ checked Sep 29, 2026	10001+	1,952 contacts →
	Partial evidence “Sinopec International Petroleum Service Corporation SSC” Source: RevenueBase Database · checked Sep 29, 2026
10	Aarvi Encon	Indirect evidence	Mumbai, IndiaHQ checked Sep 29, 2026	5,001-10,000	1,890 contacts →
	Indirect 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 29, 2026
11	TGS	Indirect evidence	Houston, TX, United StatesHQ checked Sep 29, 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 29, 2026
12	Geolog International	Indirect evidence	Dubai, United Arab EmiratesHQ checked Sep 29, 2026	1,001-5,000	1,685 contacts →
	Indirect evidence “Every year, drilling teams make decisions worth millions of dollars on incomplete information.” Source: RevenueBase Database · checked Sep 29, 2026
13	Pt. Surveyor Indonesia	Indirect evidence	IndonesiaHQ checked Sep 29, 2026	1,001-5,000	1,537 contacts →
	Indirect evidence “Surveyor Indonesia was incepted on 1 August 1991.” Source: RevenueBase Database · checked Sep 29, 2026
14	Core Laboratories	Indirect evidence	Houston, TX, United StatesHQ checked Sep 29, 2026	1,001-5,000	1,500 contacts →
	Indirect 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 29, 2026
15	RENCO	Indirect evidence	Pesaro, ItalyHQ checked Sep 29, 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 29, 2026
16	ANTON	Indirect evidence	Dubai, United Arab EmiratesHQ checked Sep 29, 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 29, 2026
17	Forum Energy Technologies	Indirect evidence	Houston, TX, United StatesHQ checked Sep 29, 2026	1,001-5,000	1,262 contacts →
	Indirect evidence “FET (Forum Energy Technologies, Inc.) is a global company, serving the crude oil, natural gas, and renewable energy industries.” Source: RevenueBase Database · checked Sep 29, 2026
18	Abraj Energy Services	Indirect evidence	Muscat, OmanHQ checked Sep 29, 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 29, 2026
19	Knight Piesold	Partial evidence	Denver, CO, United StatesHQ checked Sep 29, 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 29, 2026
20	PT Pertamina Drilling Services Indonesia	Indirect evidence	South Jakarta, IndonesiaHQ checked Sep 29, 2026	1,001-5,000	1,200 contacts →
	Indirect evidence “PT Pertamina Drilling Services Indonesia (Pertamina Drilling) was established on June 13th, 2008.” Source: RevenueBase Database · checked Sep 29, 2026
21	Barr Engineering CO	Partial evidence	Minneapolis, MN, United StatesHQ checked Sep 29, 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 29, 2026
22	Queiroz Galvão Óleo E GÁS S.A	Indirect evidence	BrazilHQ checked Sep 29, 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 29, 2026
23	Gulf Companies	Indirect evidence	Houston, TX, United StatesHQ checked Sep 29, 2026	1,001-5,000	1,046 contacts →
	Indirect evidence “At Gulf Companies, we are driven by our mission to serve a vital role in the global energy industry.” Source: RevenueBase Database · checked Sep 29, 2026
24	Sertecpet	Indirect evidence	Quito - El Coca, EcuadorHQ checked Sep 29, 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 29, 2026
25	Capital Limited	Indirect evidence	Mauritius, AustriaHQ checked Sep 29, 2026	1,001-5,000	994 contacts →
	Indirect evidence “Capital Limited is a leading service provider for the exploration and mining industry.” Source: RevenueBase Database · checked Sep 29, 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: petroleum 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 petroleum consulting firms.
Partial evidence: Its own public description names part of petroleum consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name petroleum 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 7,454 petroleum consulting firms worldwide

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 67,793 reachable decision-makers.

Free signup · no credit card

View the full list →

Petroleum consulting firms worldwide at a glance

As of Sep 29, 2026

22.6%Verified-email coverage

40.3Average contacts per company

11-50Median size (employees)

5.1%Largest-city concentration · Houston

Sep 29, 2026Page data refreshed

Companies by employee count

1-10

3,671

11-50

2,272

51-200

998

201-500

258

501-1,000

101

1,001-5,000

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 petroleum 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 petroleum consulting firms are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “petroleum 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 petroleum 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 petroleum 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, 67,793 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 29, 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.

Petroleum consulting firms by location

46 lists · largest first

Every Petroleum 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 petroleum 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 petroleum consulting firms are there worldwide?

RevenueBase identified 7,454 petroleum 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 petroleum consulting firms?

The United States leads with 1,479 companies, followed by the United Kingdom (485) and Canada (407). Every petroleum consulting firms list by country and city is linked on this page.

Which city has the most petroleum consulting firms?

Houston leads with 379 headquartered companies, followed by Calgary (219) and London (144).

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 67,793 verified decision-maker contacts tracked across these 7,454 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 29, 2026.

Ready to reach these companies? Verified emails and direct dials for all 7,454 petroleum consulting firms worldwide. Start with a free account, no credit card.

Download this list →

Related lists

Browse the directory

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.