Company lists · Data refreshed November 2026

Top 25 Oilfield consultancy services worldwide

Name: Oilfield consultancy services worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Nov 5, 2026 23,286 companies tracked

RevenueBase identified 23,286 company matches for oilfield consultancy services worldwide as of November 2026 and tracks 826,458 professional contacts across them, including 143,794 with verified work emails. The United States is the largest market and Houston the largest hub.

This list covers company matches for oilfield consultancy services 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 oilfield consultancy services 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

23,286Companies

826,458Contacts tracked

143,794Verified emails

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The 25 largest oilfield consultancy services worldwide

Ranked by team size

Top 25 of 23,286 company matches for oilfield consultancy services 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	Transocean	Exact match	Zug, SwitzerlandHQ recorded Nov 5, 2026	1,001-5,000	11,020 contacts →
	Exact match “Transocean is a leading international provider of offshore contract drilling services for oil and gas wells.” 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	Nabors Industries	Exact match	Houston, TX, United StatesHQ recorded Nov 5, 2026	10001+	6,404 contacts →
	Exact match “Nabors Industries is a leading provider of advanced technology for the energy industry.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
6	Seadrill	Exact match	Houston, United StatesHQ recorded Nov 5, 2026	1,001-5,000	5,319 contacts →
	Exact match “Seadrill is setting the standard in deepwater oil and gas drilling.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
7	Seatrium	Exact match	United StatesHQ recorded Nov 5, 2026	10001+	5,162 contacts →
	Exact match “A Premier Global Player with Deep Engineering Expertise in the offshore, marine and energy industries Engineering our Future Together.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
8	Bilfinger	Exact match	Mannheim, GermanyHQ recorded Nov 5, 2026	10001+	4,349 contacts →
	Exact match “Bilfinger is an international industrial services provider with a vision to be the No.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
9	PT Elnusa TBK	Exact match	Jakarta Selatan, IndonesiaHQ recorded Nov 5, 2026	1,001-5,000	4,263 contacts →
	Exact match “We are the one and only national company that possesses combined competencies in oil & gas services: seismic, drilling and oilfield.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
10	NESR	Exact match	Houston, United StatesHQ recorded Nov 5, 2026	5,001-10,000	3,989 contacts →
	Exact match “National Energy Services Reunited Corp.(NESR) was founded in 2017 as one of the largest national oilfield services providers in the MENA and Asia Pacific regions and was the first…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
11	ENPPI	Exact match	Nasr City 1, United StatesHQ recorded Nov 5, 2026	1,001-5,000	3,542 contacts →
	Exact match “Enppi is globally recognized as a major engineering, EPC main contractor, and management contractor, with decades of experience in onshore and offshore projects in the oil and…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
12	Valaris Limited	Exact match	Houston, United StatesHQ recorded Nov 5, 2026	5,001-10,000	3,352 contacts →
	Exact match “We Are Valaris With decades of expertise and strategic commitment built on efficiency, capability and ingenuity, our sights are continually set toward a future built with purpose…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
13	Gran Services S.A	Exact match	Macaé, BrazilHQ recorded Nov 5, 2026	1,001-5,000	3,117 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
14	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
15	Estrutural	Exact match	Porto Alegre, BrazilHQ recorded Nov 5, 2026	1,001-5,000	2,955 contacts →
	Exact match “Quem somos: Somos uma empresa nacional, com mais de 30 anos no segmento da construção, montagem e manutenção industrial.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
16	Precision Drilling	Exact match	Calgary, TX, CanadaHQ recorded Nov 5, 2026	5,001-10,000	2,730 contacts →
	Exact match “Precision is a leading provider of safe and High Performance, High-Value services to the oil and gas industry.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
17	Patterson-Uti	Exact match	Houston, TX, United StatesHQ recorded Nov 5, 2026	10001+	2,552 contacts →
	Exact match “Patterson-UTI is a leading provider of drilling and completion services to oil and natural gas exploration and production companies in the United States and other select…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
18	Zamil Offshore Services Company	Exact match	Al-khobar, Saudi ArabiaHQ recorded Nov 5, 2026	1,001-5,000	2,473 contacts →
	Exact match “Zamil Offshore Services Company has been offering diversified offshore and marine support services to the oil and gas industry since 1977.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
19	Archer	Exact match	Sandnes, NorwayHQ recorded Nov 5, 2026	5,001-10,000	2,455 contacts →
	Exact match “Archer is a company providing drilling and well services to the global energy industry.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
20	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
21	Oilserv	Exact match	Dubai, United Arab EmiratesHQ recorded Nov 5, 2026	1,001-5,000	2,408 contacts →
	Exact match “OiLSERV is a provider of an expanding range of oilfield services, including well logging, well testing, production enhancement, drilling services, surface production management…” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
22	Free Lancer	Exact match	BrazilHQ recorded Nov 5, 2026	n/a	2,408 contacts →
	Exact match “Rov company.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
23	OCYAN	Exact match	Rio De Janeiro, BrazilHQ recorded Nov 5, 2026	1,001-5,000	2,402 contacts →
	Exact match “A OCYAN atua há décadas na prestação de serviços para o setor de óleo e gás upstream, estruturando suas operações em três frentes de atuação.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
24	Ensign Energy Services	Exact match	Calgary, AB, CanadaHQ recorded Nov 5, 2026	1,001-5,000	2,359 contacts →
	Exact match “Ensign Energy Services Inc.” Recorded in the RevenueBase company graph · Nov 5, 2026 · View company records in RevenueBase
25	SAN Antonio Internacional	Exact match	Comuna 1, ArgentinaHQ recorded Nov 5, 2026	1,001-5,000	2,324 contacts →
	Exact match “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…” 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 “oilfield consultancy services”. 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 23,286 oilfield consultancy services worldwide

See the full list, filter by size, metro and specialty, and access 143,794 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Oilfield consultancy services worldwide at a glance

As of Nov 5, 2026

17.4%Verified-email coverage

35.5Average contacts per company

11-50Median size (employees)

3.5%Largest-city concentration · Houston

Nov 5, 2026Page data refreshed

Companies by employee count

1-10

9,242

11-50

7,569

51-200

3,868

201-500

1,360

501-1,000

518

1,001-5,000

446

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 oilfield consultancy services are linked below.
What qualifies: Company records worldwide whose business descriptions match “oilfield consultancy services” 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 143,794 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.

Oilfield consultancy services by location

144 lists · largest first

Every Oilfield consultancy services 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 “oilfield consultancy services”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many oilfield consultancy services are there worldwide?

RevenueBase identified 23,286 company matches for oilfield consultancy services 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 oilfield consultancy services?

The United States leads with 3,734 companies, followed by the United Kingdom (1,477) and Nigeria (1,331). Every oilfield consultancy services list by country and city is linked on this page.

Which city has the most oilfield consultancy services?

Houston leads with 819 company records, followed by Calgary (414) and Port Harcourt (364).

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 143,794 professional contacts with verified work emails tracked across these 23,286 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.