Company lists · Data refreshed September 2026

Top 25 Petroleum engineering consultants worldwide

Name: Petroleum engineering consultants worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 17, 2026 7,146 companies tracked

RevenueBase identified 7,146 petroleum engineering consultants worldwide as of September 2026 and tracks 278,357 professional contacts across them, including 62,411 with verified work emails and 0 with mobile numbers. The United States is the largest market and Houston the largest hub.

This list covers petroleum engineering consultants 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 17, 2026. Country and city lists for petroleum engineering consultants 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 17, 2026 86% judged on-target in blind review

7,146Companies

278,357Contacts tracked

62,411Verified emails

0Mobile numbers

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The 25 largest petroleum engineering consultants worldwide

Ranked by team size

Top 25 of 7,146 petroleum engineering consultants worldwide, ranked by team size, largest first. Data refreshed Sep 17, 2026. RevenueBase Smart Search rates how each company's information relates to petroleum engineering consultants: 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 17, 2026	10001+	53,380 contacts →
	Indirect evidence “We collaborate and engineer solutions to maximize asset value for our customers.” Source: RevenueBase Database · checked Sep 17, 2026
2	WOOD	Partial evidence	Aberdeen, United KingdomHQ checked Sep 17, 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 17, 2026
3	PT Elnusa TBK	Indirect evidence	Jakarta Selatan, IndonesiaHQ checked Sep 17, 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 17, 2026
4	KEY Energy Services	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 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 17, 2026
5	SAN Antonio Internacional	Indirect evidence	Comuna 1, ArgentinaHQ checked Sep 17, 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 17, 2026
6	Aarvi Encon	Strong evidence	Mumbai, IndiaHQ checked Sep 17, 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 17, 2026
7	Robtstone ME LLC	Indirect evidence	Abu Dhabi, United Arab EmiratesHQ checked Sep 17, 2026	1,001-5,000	1,638 contacts →
	Indirect evidence “At Robt.” Source: RevenueBase Database · checked Sep 17, 2026
8	Tp-Otc	Partial evidence	Çankaya, TürkiyeHQ checked Sep 17, 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 17, 2026
9	Core Laboratories	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 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 17, 2026
10	Vulcain Engineering Group	Partial evidence	Neuilly-sur-seine, FranceHQ checked Sep 17, 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 17, 2026
11	RENCO	Indirect evidence	Pesaro, ItalyHQ checked Sep 17, 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 17, 2026
12	Audubon Companies	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	1,001-5,000	1,488 contacts →
	Indirect evidence “Founded in 1997, Audubon Companies LLC provides EPC, consulting, fabrication, and field services to energy and industrial operators across the globe.” Source: RevenueBase Database · checked Sep 17, 2026
13	ANTON	Indirect evidence	Dubai, United Arab EmiratesHQ checked Sep 17, 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 17, 2026
14	Partner Engineering & Science, INC	Indirect evidence	Torrance, CA, United StatesHQ checked Sep 17, 2026	1,001-5,000	1,358 contacts →
	Indirect evidence “Partner Assessment Corp.” Source: RevenueBase Database · checked Sep 17, 2026
15	Atwell, LLC	Partial evidence	Southfield, MI, United StatesHQ checked Sep 17, 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 17, 2026
16	Abraj Energy Services	Indirect evidence	Muscat, OmanHQ checked Sep 17, 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 17, 2026
17	Knight Piesold	Indirect evidence	Denver, CO, United StatesHQ checked Sep 17, 2026	1,001-5,000	1,231 contacts →
	Indirect 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 17, 2026
18	PT Pertamina Drilling Services Indonesia	Indirect evidence	South Jakarta, IndonesiaHQ checked Sep 17, 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 17, 2026
19	Zuhair Fayez	Partial evidence	Riyadh, Saudi ArabiaHQ checked Sep 17, 2026	1,001-5,000	1,113 contacts →
	Partial 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 17, 2026
20	Barr Engineering CO	Partial evidence	Minneapolis, MN, United StatesHQ checked Sep 17, 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 17, 2026
21	Excellence Logging	Indirect evidence	London W2 2es, United KingdomHQ checked Sep 17, 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 17, 2026
22	Qualidados Engenharia	Indirect evidence	Salvador, BrazilHQ checked Sep 17, 2026	501-1,000	927 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 17, 2026
23	Pares&alvarez	Partial evidence	Santiago, ChileHQ checked Sep 17, 2026	501-1,000	807 contacts →
	Partial evidence “We are Pares & Alvarez, our extensive experience and the recognition of our clients makes us one of the leading Engineering Companies in environmental, consulting, engineering and…” Source: RevenueBase Database · checked Sep 17, 2026
24	BGC Engineering INC	Partial evidence	Vancouver, BC, CanadaHQ checked Sep 17, 2026	501-1,000	798 contacts →
	Partial evidence “BGC Engineering is an international consulting firm that provides professional services in applied earth sciences.” Source: RevenueBase Database · checked Sep 17, 2026
25	Bolashak Atyrau LLP & Bolashak International LTD	Partial evidence	Atyrau, KazakhstanHQ checked Sep 17, 2026	5,001-10,000	793 contacts →
	Partial 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 17, 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 engineering consultants. 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 engineering consultants.
Partial evidence: Its own public description names part of petroleum engineering consultants, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name petroleum engineering consultants. 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 7,146 petroleum engineering consultants worldwide

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Petroleum engineering consultants worldwide at a glance

As of Sep 17, 2026

22.4%Verified-email coverage

39.0Average contacts per company

11-50Median size (employees)

5.6%Largest-city concentration · Houston

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

3,280

11-50

2,222

51-200

1,083

201-500

303

501-1,000

121

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 petroleum engineering consultants, 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: 35 countries, largest first: the United States, the United Kingdom, Canada, Brazil, India, Nigeria, Iran, Australia, the United Arab Emirates, Italy and 25 more. Country and city lists for petroleum engineering consultants are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “petroleum engineering consultants”. 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 engineering consultants), 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 engineering consultants, 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, 62,411 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 17, 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 engineering consultants by location

47 lists · largest first

Every Petroleum engineering consultants 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 engineering consultants, 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 engineering consultants are there worldwide?

RevenueBase identified 7,146 petroleum engineering consultants 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 engineering consultants?

The United States leads with 1,683 companies, followed by the United Kingdom (558) and Canada (504). Every petroleum engineering consultants list by country and city is linked on this page.

Which city has the most petroleum engineering consultants?

Houston leads with 398 headquartered companies, followed by Calgary (273) and Tehran (198).

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 62,411 verified decision-maker contacts tracked across these 7,146 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 17, 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.