Company lists · Data refreshed November 2026

Top 25 Subsurface technical consulting firms worldwide

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

Compiled by the RevenueBase Data Team Data refreshed Nov 5, 2026 9,468 companies tracked

RevenueBase identified 9,468 company matches for subsurface technical consulting firms worldwide as of November 2026 and tracks 302,273 professional contacts across them, including 79,623 with verified work emails. The United States is the largest market and Houston the largest hub.

This list covers company matches for subsurface technical consulting firms worldwide, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed November 5, 2026. Country and city lists for subsurface technical consulting firms follow the table.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 RevenueBase SmartSearch · Exact Recorded Nov 5, 2026 How this list was built

9,468Companies

302,273Contacts tracked

79,623Verified emails

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The 25 largest subsurface technical consulting firms worldwide

Ranked by team size

Top 25 of 9,468 company matches for subsurface technical consulting firms worldwide, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Nov 5, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Halliburton	Exact match	Houston, United StatesHQ recorded Nov 5, 2026	10001+	58,281 contacts →
	Exact match “We collaborate and engineer solutions to maximize asset value for our customers.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
2	WOOD	Exact match	Aberdeen, United KingdomHQ recorded Nov 5, 2026	10001+	16,375 contacts →
	Exact match “Wood is a global leader in consulting and engineering, delivering critical solutions across energy and materials markets.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
3	FUGRO	Exact match	Nootdorp, NetherlandsHQ recorded Nov 5, 2026	10001+	8,737 contacts →
	Exact match “We are the world’s leading Geo-data specialist, collecting and analysing comprehensive information about the Earth and the structures built upon it.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
4	EXPRO	Exact match	Houston, United StatesHQ recorded Nov 5, 2026	5,001-10,000	6,924 contacts →
	Exact match “Long recognized for extraordinary performance, superb safety and long-standing partnerships, and now incorporating Frank’s International, Expro is focused on enabling our…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
5	Terracon	Exact match	Olathe, NE, United StatesHQ recorded Nov 5, 2026	5,001-10,000	6,576 contacts →
	Exact match “Terracon is a 100 percent employee-owned consulting engineering firm providing quality services to clients.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
6	KEY Energy Services	Exact match	Houston, TX, United StatesHQ recorded Nov 5, 2026	1,001-5,000	2,991 contacts →
	Exact match “Headquartered in Houston, Texas, Key Energy Services provides a wide array of leading edge energy production solutions and services.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
7	SRK Consulting	Exact match	Vancouver, CanadaHQ recorded Nov 5, 2026	1,001-5,000	2,428 contacts →
	Exact match “SRK Consulting is an independent, international group providing specialised consultancy services.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
8	ECS Group Of Companies	Exact match	Chantilly, VA, United StatesHQ recorded Nov 5, 2026	1,001-5,000	2,363 contacts →
	Exact match “ECS Group of Companies is a Chantilly, VA-based consulting engineering firm.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
9	J.S. Held LLC	Exact match	Jericho, NY, PalestineHQ recorded Nov 5, 2026	1,001-5,000	2,131 contacts →
	Exact match “J.S.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
10	Aarvi Encon	Exact match	Mumbai, IndiaHQ recorded Nov 5, 2026	5,001-10,000	1,982 contacts →
	Exact match “Aarvi Encon has established it's leadership in providing Engineering Consultancy and Technical Assistance to Oil & Gas, Refinery, Petrochemical, Pipelines, Power & Infrastructure…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
11	TGS	Exact match	Houston, TX, United StatesHQ recorded Nov 5, 2026	1,001-5,000	1,926 contacts →
	Exact match “TGS provides advanced data and intelligence to companies active in the energy sector.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
12	Geolog International	Exact match	Dubai, United Arab EmiratesHQ recorded Nov 5, 2026	1,001-5,000	1,792 contacts →
	Exact match “Every year, drilling teams make decisions worth millions of dollars on incomplete information.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
13	RENCO	Exact match	Pesaro, ItalyHQ recorded Nov 5, 2026	1,001-5,000	1,722 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
14	Vulcain Engineering Group	Exact match	Neuilly-sur-seine, FranceHQ recorded Nov 5, 2026	5,001-10,000	1,705 contacts →
	Exact match “Vulcain Engineering Group is a multi-specialist engineering and consulting group serving industrial companies across the globe, focused on critical sectors: energy, health…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
15	Capital Limited	Exact match	Mauritius, AustriaHQ recorded Nov 5, 2026	1,001-5,000	1,681 contacts →
	Exact match “Capital Limited is a leading service provider for the exploration and mining industry.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
16	Exponent	Exact match	Menlo Park, FL, United StatesHQ recorded Nov 5, 2026	1,001-5,000	1,679 contacts →
	Exact match “In an era of accelerating change, Exponent is the only premium engineering and scientific consulting firm with the depth and breadth of expertise to solve our clients’ most…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
17	Core Laboratories	Exact match	Houston, TX, United StatesHQ recorded Nov 5, 2026	1,001-5,000	1,601 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
18	Knight Piesold	Exact match	Belvedere, United StatesHQ recorded Nov 5, 2026	1,001-5,000	1,378 contacts →
	Exact match “Knight Piésold is an employee-owned, global consulting firm delivering specialist services to the mining, power, water resources, and infrastructure industries.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
19	PT Pertamina Drilling Services Indonesia	Exact match	South Jakarta, IndonesiaHQ recorded Nov 5, 2026	1,001-5,000	1,344 contacts →
	Exact match “PT Pertamina Drilling Services Indonesia (Pertamina Drilling) was established on June 13th, 2008.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
20	Abraj Energy Services	Exact match	Muscat, OmanHQ recorded Nov 5, 2026	1,001-5,000	1,315 contacts →
	Exact match “Abraj Energy Services ("Abraj"), was founded in May 2006 and has taken major strides.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
21	Lycopodium	Exact match	Perth, AustraliaHQ recorded Nov 5, 2026	1,001-5,000	1,250 contacts →
	Exact match “Lycopodium is an Australian headquartered engineering and project management consultancy which provides a complete range of services for the evaluation, development…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
22	BGP	Exact match	Hebei, ChinaHQ recorded Nov 5, 2026	10001+	1,238 contacts →
	Exact match “BGP is one of the world's leading geophysical service companies, delivering a wide range of technologies, services and equipment to the oil and gas industry worldwide.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
23	Excellence Logging	Exact match	London W2 2es, United KingdomHQ recorded Nov 5, 2026	1,001-5,000	866 contacts →
	Exact match “Excellence Logging is an established energy services provider focused on optimizing well performance.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
24	Bolashak Atyrau LLP & Bolashak International LTD	Exact match	Atyrau, KazakhstanHQ recorded Nov 5, 2026	5,001-10,000	859 contacts →
	Exact match “Bolashak Group is a market leader in the provision of Technical & Engineering solutions to Kazakhstan’s Oil & Gas, Petrochemical, Construction, Mining, Telecommunication…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
25	Pioneer Energy Services	Exact match	San Antonio, TX, United StatesHQ recorded Nov 5, 2026	1,001-5,000	852 contacts →
	Exact match “Pioneer Energy Services is now Patterson-UTI” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “subsurface technical consulting firms”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 9,468 subsurface technical consulting firms worldwide

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Subsurface technical consulting firms worldwide at a glance

As of Nov 5, 2026

26.3%Verified-email coverage

31.9Average contacts per company

1-10Median size (employees)

3.5%Largest-city concentration · Houston

Nov 5, 2026Page data refreshed

Companies by employee count

1-10

5,117

11-50

2,828

51-200

1,024

201-500

256

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency is reported on each country list linked below.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
Coverage: Every country. Country and city lists for subsurface technical consulting firms are linked below.
What qualifies: Company records worldwide whose business descriptions match “subsurface technical consulting firms” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 79,623 professional contacts with verified work emails across the full matched dataset. 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 November 5, 2026. Lists refresh periodically as the graph is re-checked.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Subsurface technical consulting firms by location

59 lists · largest first

Every Subsurface technical 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 SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “subsurface technical consulting firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many subsurface technical consulting firms are there worldwide?

RevenueBase identified 9,468 company matches for subsurface technical consulting firms worldwide as of November 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Halliburton tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which country has the most subsurface technical consulting firms?

The United States leads with 1,597 companies, followed by the United Kingdom (620) and Canada (503). Every subsurface technical consulting firms list by country and city is linked on this page.

Which city has the most subsurface technical consulting firms?

Houston leads with 327 company records, followed by Calgary (198) and London (151).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 79,623 professional contacts with verified work emails tracked across these 9,468 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on November 5, 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 SmartSearch, 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.