Company lists · Data refreshed September 2026

Top 25 Petroleum engineering firms based in Houston, United States

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

Compiled by the RevenueBase Data Team Data refreshed Sep 17, 2026 337 companies tracked

RevenueBase identified 337 petroleum engineering firms headquartered in Houston, United States as of September 2026 and tracks 78,909 professional contacts across them, including 21,727 with verified work emails. Houston is the largest hub.

This list covers petroleum engineering firms headquartered in Houston, United States, 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.

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

337Companies

78,909Contacts tracked

21,727Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest petroleum engineering firms based in Houston, United States

Ranked by team size

Top 25 of 337 petroleum engineering firms based in Houston, United States, ranked by team size, largest first. Data refreshed Sep 17, 2026. RevenueBase Smart Search rates how each company's information relates to petroleum engineering firms: 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	Nabors Industries	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	10001+	5,865 contacts →
	Indirect evidence “Nabors Industries is a leading provider of advanced technology for the energy industry.” Source: RevenueBase Database · checked Sep 17, 2026
3	NESR	Indirect evidence	Houston, United StatesHQ checked Sep 17, 2026	5,001-10,000	3,683 contacts →
	Indirect evidence “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…” 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	Patterson-Uti	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	10001+	2,317 contacts →
	Indirect evidence “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…” Source: RevenueBase Database · checked Sep 17, 2026
6	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
7	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
8	Enervest, LTD	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	201-500	424 contacts →
	Indirect evidence “EnerVest is a top-tier, low-cost oil and natural gas operating company.” Source: RevenueBase Database · checked Sep 17, 2026
9	Express Energy Services	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	501-1,000	379 contacts →
	Indirect evidence “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…” Source: RevenueBase Database · checked Sep 17, 2026
10	AIR Drilling Associates	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	201-500	328 contacts →
	Indirect evidence “ADA is a global energy services company specializing in advanced drilling solutions for oil, gas, and geothermal applications.” Source: RevenueBase Database · checked Sep 17, 2026
11	NCS Multistage	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	201-500	301 contacts →
	Indirect evidence “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.” Source: RevenueBase Database · checked Sep 17, 2026
12	Greene's Energy Group	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	201-500	285 contacts →
	Indirect evidence “Greene’s Energy Group offers a range of support services and products to the oil and gas industry.” Source: RevenueBase Database · checked Sep 17, 2026
13	Casedhole-Solutions, Inc.- A C&j Energy Company	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	501-1,000	191 contacts →
	Indirect evidence “Getting it done right.” Source: RevenueBase Database · checked Sep 17, 2026
14	Zentech Incorporated	Partial evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	51-200	181 contacts →
	Partial evidence “Zentech, Inc, an engineering consulting and software development company, headquartered in Houston, TX, is comprised of experienced professionals specializing in providing…” Source: RevenueBase Database · checked Sep 17, 2026
15	Perc Engineering	Partial evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	51-200	124 contacts →
	Partial evidence “PERC Engineering is a full-service engineering & project management firm in the oil & gas energy sector.” Source: RevenueBase Database · checked Sep 17, 2026
16	Edge Engineering And Science, LLC	Partial evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	51-200	116 contacts →
	Partial evidence “Edge Engineering & Science, LLC (EDGE) is a privately owned professional services firm headquartered in Houston, Texas.” Source: RevenueBase Database · checked Sep 17, 2026
17	Bedrock	Partial evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	501-1,000	115 contacts →
	Partial evidence “Bedrock Petroleum Consultants was formed in 2011 with the goal of providing the highest level of quality service to both our consultants and operator clients.” Source: RevenueBase Database · checked Sep 17, 2026
18	Ryder Scott Co. L.P	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	51-200	109 contacts →
	Indirect evidence “Ryder Scott Company, L.P.” Source: RevenueBase Database · checked Sep 17, 2026
19	Enertia Software	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	51-200	108 contacts →
	Indirect evidence “Enertia Software continues to lead the upstream oil and gas industry with integrated enterprise solutions for the upstream oil and gas industry.” Source: RevenueBase Database · checked Sep 17, 2026
20	Moduspec	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	201-500	101 contacts →
	Indirect evidence “ModuSpec first introduced the concept of rig inspection to the market in 1986 and since then, has been providing unrivalled expertise and assurance to support safe operations…” Source: RevenueBase Database · checked Sep 17, 2026
21	Stonebridge Consulting	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	51-200	101 contacts →
	Indirect evidence “Stonebridge Consulting provides business advisory and technology services for next-gen oil and gas.” Source: RevenueBase Database · checked Sep 17, 2026
22	Upstream International LLC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	501-1,000	87 contacts →
	Indirect evidence “Upstream International provides drilling, completions/work-over, directional, MWD, safety, fluids and MPD professionals to the oil and gas industry.” Source: RevenueBase Database · checked Sep 17, 2026
23	Strategy Engineering And Consulting, LLC	Partial evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	51-200	76 contacts →
	Partial evidence “Strategy Engineering is a privately-owned technical services company located within the Energy Corridor in Houston, TX.” Source: RevenueBase Database · checked Sep 17, 2026
24	Pinnacle Engineering	Partial evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	51-200	62 contacts →
	Partial evidence “Since 1993, Pinnacle has remained focused on providing practical and complete engineering services to the offshore oil and gas industry.” Source: RevenueBase Database · checked Sep 17, 2026
25	F&c Engineers	Indirect evidence	Houston, TX, United StatesHQ checked Sep 17, 2026	51-200	60 contacts →
	Indirect evidence “F&C Engineers provides full services from concept to start up for the oil and gas upstream, midstream, and turbomachinery industries.” 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 firms. 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 firms.
Partial evidence: Its own public description names part of petroleum engineering firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name petroleum engineering firms. 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 337 petroleum engineering firms based in Houston, United States

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 21,727 reachable decision-makers.

Free signup · no credit card

View the full list →

Petroleum engineering firms based in Houston, United States at a glance

As of Sep 17, 2026

27.5%Verified-email coverage

234.2Average contacts per company

11-50Median size (employees)

100.0%Largest-city concentration · Houston

Sep 17, 2026Page data refreshed

Companies by employee count

1-10

149

11-50

117

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency for this list is measured across the whole United States list rather than for Houston, so it is reported there. Company counts and contact totals on this page are exact for Houston, over 337 companies.

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 firms, 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.
What qualifies: Companies headquartered in Houston, United States whose own description of what they do matches “petroleum engineering firms”. 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 firms), 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 firms, and records with no verified work email. Companies headquartered outside Houston are excluded even when they keep an office there.
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, 21,727 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 firms by metro in the United States

Petroleum engineering firms in Houston337
Petroleum engineering firms in Denver45
Petroleum engineering firms in Midland41
Petroleum engineering firms in Dallas31
Petroleum engineering firms in The Woodlands28

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 firms, 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 firms are there based in Houston, United States?

RevenueBase identified 337 petroleum engineering firms headquartered in Houston, United States 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 city has the most petroleum engineering firms?

Houston leads with 337 headquartered companies, 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 the top results, verified emails and direct dials included. Upgrading unlocks all 21,727 verified decision-maker contacts tracked across these 337 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.

Ready to reach these companies? Verified emails and direct dials for all 337 petroleum engineering firms based in Houston, United States. Start with a free account, no credit card.

Download this list →

Related lists

Petroleum engineering firms by geography

Browse the directory

Browse: Companies home · Petroleum engineering firms in United States · All United States lists · All Petroleum engineering firms lists · New lists

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.