Company lists · Data refreshed September 2026

Reservoir engineering consultants: the worldwide list

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

Compiled by the RevenueBase Data Team Data refreshed Sep 17, 2026 1,814 companies across 14 countries

RevenueBase identified 1,814 reservoir engineering consultants across the 14 countries with a published list, as of September 2026, and tracks 89,926 professional contacts across them, including 25,385 with verified work emails and 0 with mobile numbers. The United States is the largest market and Houston the largest hub.

This is the worldwide list of reservoir engineering consultants: the 14 country lists RevenueBase publishes for the category, summed and ranked as one. The company count is that sum, not a census of every company on earth; a country with no published list is not counted. 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.

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

1,814Companies

89,926Contacts tracked

25,385Verified emails

0Mobile numbers

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The 25 largest reservoir engineering consultants across the 14 countries with a published list

Ranked by team size

Top 25 of 1,814 reservoir engineering consultants across the 14 countries with a published list, ranked by team size, largest first. Data refreshed Sep 17, 2026. RevenueBase Smart Search rates how each company's information relates to reservoir 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	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
3	Geolog International	Indirect evidence	Dubai, United Arab EmiratesHQ checked Sep 17, 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 17, 2026
4	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
5	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
6	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
7	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
8	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
9	AGR	Partial evidence	Oslo, NorwayHQ checked Sep 17, 2026	501-1,000	768 contacts →
	Partial evidence “AGR – an Aqualis company – is a multidisciplinary consultancy, specialising in drilling & wells, subsurface, marine and subsea solutions, resourcing, technical safety and software…” Source: RevenueBase Database · checked Sep 17, 2026
10	Nine Energy Service	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	1,001-5,000	712 contacts →
	Indirect evidence “With a culture built on high performance and flawless execution, Nine Energy Service is a unique kind of oilfield services company, offering industry-shaping completion solutions…” Source: RevenueBase Database · checked Sep 17, 2026
11	KBR Granherne	Strong evidence	Leatherhead, United KingdomHQ checked Sep 17, 2026	501-1,000	648 contacts →
	Strong evidence “KBR Consulting is one of the world's foremost engineering consultancies specializing in the hydrocarbon and energy industry.” Source: RevenueBase Database · checked Sep 17, 2026
12	Interwell	Indirect evidence	Røyneberg, United KingdomHQ checked Sep 17, 2026	501-1,000	637 contacts →
	Indirect evidence “At Interwell our mission is clear; we are committed to solving the toughest well challenges with unmatched expertise and dedication.” Source: RevenueBase Database · checked Sep 17, 2026
13	Sidvin Energy Engineering	Partial evidence	Bangalore, IndiaHQ checked Sep 17, 2026	201-500	441 contacts →
	Partial evidence “SIDVIN, a customer focused Engineering Service provider for Oil & Gas, Petrochemical & Process Industry has been delivering exacting solutions through its innovative, unleashing…” Source: RevenueBase Database · checked Sep 17, 2026
14	Neo2	Strong evidence	Levallois-perret, FranceHQ checked Sep 17, 2026	501-1,000	390 contacts →
	Strong evidence “NEO2 is an Engineering Consultancy and Resource Provider active in the Oil & Gas, Water Treatment & Desalination, and Power Generation industries.” Source: RevenueBase Database · checked Sep 17, 2026
15	Prodeng	Indirect evidence	Allen, ArgentinaHQ checked Sep 17, 2026	201-500	344 contacts →
	Indirect evidence “Es una compañía de servicios creada en el año 2009 para trabajar en el upstream de la industria petrolera.” Source: RevenueBase Database · checked Sep 17, 2026
16	DNV - OIL & GAS	Indirect evidence	Høvik, NorwayHQ checked Sep 17, 2026	1,001-5,000	332 contacts →
	Indirect evidence “DNV’s Oil & Gas business and GL Noble Denton have become DNV GL - Oil & Gas.” Source: RevenueBase Database · checked Sep 17, 2026
17	Asian Energy Services Limited	Partial evidence	Mumbai, IndiaHQ checked Sep 17, 2026	51-200	300 contacts →
	Partial evidence “ASIAN is a reservoir imaging company, offering a suite of geophysical services specializing in land and well seismic services.” Source: RevenueBase Database · checked Sep 17, 2026
18	Degolyer And Macnaughton	Partial evidence	Dallas, TX, United StatesHQ checked Sep 17, 2026	201-500	268 contacts →
	Partial evidence “Reserves assessments and appraisals • Prospective resources assessments • Unconventional resources assessments • Contingent resources assessments • Reservoir simulation •…” Source: RevenueBase Database · checked Sep 17, 2026
19	Computer Modelling Group	Indirect evidence	Calgary, AB, CanadaHQ checked Sep 17, 2026	201-500	267 contacts →
	Indirect evidence “Innovators in Simulation Technology CMG is a global software and consulting company that combines science and technology with deep industry expertise to solve complex subsurface…” Source: RevenueBase Database · checked Sep 17, 2026
20	Rock Flow Dynamics	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	201-500	263 contacts →
	Indirect evidence “New technologies developed by the research and product development teams of Rock Flow Dynamics are integrated into the company’s flagship product – tNavigator.” Source: RevenueBase Database · checked Sep 17, 2026
21	Intera Incorporated	Partial evidence	Austin, TX, United StatesHQ checked Sep 17, 2026	201-500	259 contacts →
	Partial evidence “Established in 1974, INTERA is a geosciences and engineering consulting firm focused on providing water resources and supply, environmental, mining, radioactive waste isolation…” Source: RevenueBase Database · checked Sep 17, 2026
22	M&h	Indirect evidence	Spring, TX, United StatesHQ checked Sep 17, 2026	201-500	253 contacts →
	Indirect evidence “For more than 40 years, M&H has been a trusted source for oil & gas consulting services that maximize value for clients.” Source: RevenueBase Database · checked Sep 17, 2026
23	PT Singgar Mulia	Strong evidence	Jakarta Selatan, IndonesiaHQ checked Sep 17, 2026	501-1,000	235 contacts →
	Strong evidence “Pt singgar mulia, engineering consultant in oil, gas and energy industry” Source: RevenueBase Database · checked Sep 17, 2026
24	Clear Petroleum	Indirect evidence	Buenos Aires, ArgentinaHQ checked Sep 17, 2026	1,001-5,000	231 contacts →
	Indirect evidence “For more than 30 years we have been a reliable partner in the oil and gas industry.” Source: RevenueBase Database · checked Sep 17, 2026
25	CVA Group	Indirect evidence	Bayonne, FranceHQ checked Sep 17, 2026	201-500	214 contacts →
	Indirect evidence “We believe that there is a human and technical value chain through the entire energy workflow.” 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: reservoir 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 reservoir engineering consultants.
Partial evidence: Its own public description names part of reservoir engineering consultants, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name reservoir 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 1,814 reservoir engineering consultants across the 14 countries with a published list

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Reservoir engineering consultants worldwide at a glance

As of Sep 17, 2026

28.2%Verified-email coverage

49.6Average contacts per company

1-10Median size (employees)

12.2%Largest-city concentration · Houston

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

1,029

11-50

525

51-200

182

201-500

501-1,000

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 reservoir 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: This worldwide list is the sum of the 14 country lists RevenueBase publishes for reservoir engineering consultants, largest first: the United States, the United Kingdom, Canada, Australia, Brazil, Nigeria, France, the United Arab Emirates, India, Argentina and 4 more. Its company and contact totals add up those lists, so they understate the true worldwide figures: a country with no published list is not counted. The ranked table is exact across the countries covered, the largest companies of every country list ranked together with duplicates removed.
What qualifies: Companies worldwide whose own description of what they do matches “reservoir 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 reservoir 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 reservoir 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, 25,385 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: The country lists behind this page 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.

Reservoir engineering consultants by location

14 lists · largest first

Every Reservoir engineering consultants list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date; the worldwide figures above are the sum of the 14 country lists.

Countries

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 reservoir 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 reservoir engineering consultants are there worldwide?

RevenueBase identified 1,814 reservoir engineering consultants across the 14 countries with a published list, as of September 2026, matched on each company's own description of what it does rather than its industry code. The figure is the sum of those country lists, not a census of every company worldwide.

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 reservoir engineering consultants?

The United States leads with 699 companies, followed by the United Kingdom (241) and Canada (216). Every country with a published reservoir engineering consultants list is linked on this page.

Which city has the most reservoir engineering consultants?

Houston leads with 221 headquartered companies, followed by Calgary (159) and London (59).

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 25,385 verified decision-maker contacts tracked across these 1,814 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. The country lists behind this page were pulled from the company graph 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.