Company lists · Data refreshed September 2026

Top 25 Petroleum engineering firms based in the United States

Name: Petroleum engineering firms based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 17, 2026 1,462 companies tracked

RevenueBase identified 1,462 company matches for petroleum engineering firms associated with the United States as of September 2026 and tracks 107,706 professional contacts across them, including 31,269 with verified work emails. Houston is the largest hub.

This list covers company matches for petroleum engineering firms associated with the United States, 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 September 17, 2026.

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 Sep 17, 2026 How this list was built

1,462Companies

107,706Contacts tracked

31,269Verified emails

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The 25 largest petroleum engineering firms based in the United States

Ranked by team size

Top 25 of 1,462 company matches for petroleum engineering firms based in the United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 17, 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, TX, United StatesHQ recorded Sep 17, 2026	10001+	53,380 contacts →
	Exact match “We collaborate and engineer solutions to maximize asset value for our customers.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
2	Nabors Industries	Exact match	Houston, TX, United StatesHQ recorded Sep 17, 2026	10001+	5,865 contacts →
	Exact match “Nabors Industries is a leading provider of advanced technology for the energy industry.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
3	NESR	Exact match	Houston, United StatesHQ recorded Sep 17, 2026	5,001-10,000	3,683 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 · Sep 17, 2026 · View company records in RevenueBase
4	KEY Energy Services	Exact match	Houston, TX, United StatesHQ recorded Sep 17, 2026	1,001-5,000	2,755 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 · Sep 17, 2026 · View company records in RevenueBase
5	Patterson-Uti	Exact match	Houston, TX, United StatesHQ recorded Sep 17, 2026	10001+	2,317 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 · Sep 17, 2026 · View company records in RevenueBase
6	Core Laboratories	Exact match	Houston, TX, United StatesHQ recorded Sep 17, 2026	1,001-5,000	1,500 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 · Sep 17, 2026 · View company records in RevenueBase
7	Partner Engineering & Science, INC	Exact match	Torrance, CA, United StatesHQ recorded Sep 17, 2026	1,001-5,000	1,358 contacts →
	Exact match “Partner Assessment Corp.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
8	Atwell, LLC	Exact match	Southfield, MI, United StatesHQ recorded Sep 17, 2026	1,001-5,000	1,290 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
9	Cudd Energy Services	Exact match	The Woodlands, TX, United StatesHQ recorded Sep 17, 2026	1,001-5,000	1,285 contacts →
	Exact match “Cudd offers a broad range of technical and specialized oilfield services to companies engaged in the exploration and production of oil and natural gas worldwide.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
10	Newpark	Exact match	Katy, TX, United StatesHQ recorded Sep 17, 2026	1,001-5,000	1,244 contacts →
	Exact match “Newpark Fluids Systems is the world’s leading pure-play oil & gas and geothermal fluid solutions provider.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
11	Knight Piesold	Exact match	Denver, CO, United StatesHQ recorded Sep 17, 2026	1,001-5,000	1,231 contacts →
	Exact match “Knight Piésold is an employee-owned, global consulting firm providing specialist services to the mining, power, water resources, and infrastructure industries.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
12	Barr Engineering CO	Exact match	Minneapolis, MN, United StatesHQ recorded Sep 17, 2026	1,001-5,000	1,088 contacts →
	Exact match “Barr provides engineering and environmental consulting services to clients across the Midwest, throughout the Americas, and around the world.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
13	Nine Energy Service	Exact match	Houston, TX, United StatesHQ recorded Sep 17, 2026	1,001-5,000	712 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
14	EDG	Exact match	Metairie, LA, United StatesHQ recorded Sep 17, 2026	501-1,000	700 contacts →
	Exact match “EDG Inc.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
15	Fesco, LTD	Exact match	Alice, TX, United StatesHQ recorded Sep 17, 2026	1,001-5,000	651 contacts →
	Exact match “FESCO is a diversified energy services company providing quality equipment and experienced personnel since 1949.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
16	Consultec International INC	Exact match	Miami, FL, United StatesHQ recorded Sep 17, 2026	501-1,000	580 contacts →
	Exact match “Somos una empresa multinacional líder en servicios de Consultoría de Oil & Gas, IT, Ingeniería, Recursos Humanos, Head Hunter y Proyectos” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
17	E2 Consulting Engineers, INC	Exact match	Emeryville, CA, United StatesHQ recorded Sep 17, 2026	501-1,000	526 contacts →
	Exact match “Dedicated to “Excellence in Engineering,” E2 Consulting Engineers, Inc.(E2) is a professional services firm established in 1988 specializing in a full spectrum of engineering…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
18	Anvil Corporation	Exact match	Bellingham, WA, United StatesHQ recorded Sep 17, 2026	201-500	460 contacts →
	Exact match “Founded in 1971, Anvil Corporation is a 100% employee-owned engineering firm providing multi-discipline engineering, design, project management, procurement, and construction…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
19	Cactus Drilling CO	Exact match	Oklahoma City, OK, United StatesHQ recorded Sep 17, 2026	1,001-5,000	440 contacts →
	Exact match “As the largest privately-held domestic land drilling contractor in the United States, Cactus provides competent, motivated personnel utilizing premium equipment to meet and exceed…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
20	Enervest, LTD	Exact match	Houston, TX, United StatesHQ recorded Sep 17, 2026	201-500	424 contacts →
	Exact match “EnerVest is a top-tier, low-cost oil and natural gas operating company.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
21	Recon Management Services, INC	Exact match	Sulphur, LA, United StatesHQ recorded Sep 17, 2026	501-1,000	420 contacts →
	Exact match “ReCon was established in 1995 and has matured as a high quality and competitive engineering consulting firm providing engineering design and project management services to the…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
22	Express Energy Services	Exact match	Houston, TX, United StatesHQ recorded Sep 17, 2026	501-1,000	379 contacts →
	Exact match “Express Energy Services, a leading oilfield services company, is active in every major hydrocarbon basin in the United States and is a premier provider of products and services…” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
23	Manhard Consulting	Exact match	Lincolnshire, IL, United StatesHQ recorded Sep 17, 2026	201-500	365 contacts →
	Exact match “Manhard Consulting has joined Atwell, a national consulting, engineering, and construction services firm with 2,100 technical professionals across the country.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
24	AIR Drilling Associates	Exact match	Houston, TX, United StatesHQ recorded Sep 17, 2026	201-500	328 contacts →
	Exact match “ADA is a global energy services company specializing in advanced drilling solutions for oil, gas, and geothermal applications.” Recorded in the RevenueBase company graph · Sep 17, 2026 · View company records in RevenueBase
25	NCS Multistage	Exact match	Houston, TX, United StatesHQ recorded Sep 17, 2026	201-500	301 contacts →
	Exact match “Since our founding in 2006, NCS Multistage has grown to be a leading provider of engineered products and support services for oil and natural gas wells around the world.” Recorded in the RevenueBase company graph · Sep 17, 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 “petroleum engineering 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 1,462 petroleum engineering firms based in the United States

See the full list, filter by size, metro and specialty, and access 31,269 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Petroleum engineering firms based in the United States at a glance

As of Sep 17, 2026

29.0%Verified-email coverage

73.7Average contacts per company

11-50Median size (employees)

23.1%Largest-city concentration · Houston

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

685

11-50

465

51-200

203

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 1,462 companies.

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.
What qualifies: Company records associated with the United States whose business descriptions match “petroleum engineering 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. Where headquarters information is recorded, preview rows are also filtered to this page’s location. 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 31,269 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 September 17, 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.

Petroleum engineering firms by metro

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 “petroleum engineering firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many petroleum engineering firms are there based in the United States?

RevenueBase identified 1,462 company matches for petroleum engineering firms associated with the United States as of September 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 city has the most petroleum engineering firms?

Houston leads with 337 company records, followed by Denver (45) and Midland (41).

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 31,269 professional contacts with verified work emails tracked across these 1,462 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 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 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.