Netherland, Sewell & Associates

What Netherland, Sewell & Associates does

Netherland, Sewell & Associates, Inc. (NSAI) is a privately held, Dallas-headquartered petroleum consulting firm founded in 1961 by Clarence Netherland, with a second office in Houston established in the early 1990s. The firm provides fully integrated engineering, geological, geophysical, petrophysical, and economic analyses of upstream oil and gas properties for industry, financial organizations, and government agencies. Its core service offering — SEC-compliant reserves reports and audits — is delivered to more companies than any other petroleum consulting firm in the market, with the company claiming thousands of completed assignments across 100+ countries.

The firm's technical platform combines a proprietary in-house economics system with industry-standard reservoir simulation software (Eclipse, tNavigator, IMEX, GEM, Rubis, Nexus) and supports multi-decade history-match models. Practice areas span acquisition and divestiture evaluations, equity determinations, project finance certifications, deepwater development studies, enhanced recovery, gas storage, coal seam gas, prospective resources assessments, and unconventional oil and gas. The firm has extended its offering into the energy transition via CCUS certifications, GHG management, and helium resources evaluations, and runs a global seminar program that doubles as a relationship-development channel.

NSAI operates a relationship-driven, sales-led professional-services model. Engagements are project-based and quoted by scope; pricing is not publicly disclosed. Demand is driven by recurring SEC reporting cycles, M&A and A&D activity, reserves-based lending, capital-markets transactions (IPOs and bond offerings), and litigation support. The leadership team is composed almost entirely of senior engineers and geoscientists recruited from major oil and gas companies including ExxonMobil, Chevron, BP, ConocoPhillips, and BG plc. Ownership is private with no disclosed institutional investors or parent company.

Name

Netherland, Sewell & Associates

Legal name

Netherland, Sewell & Associates, Inc.

Website

https://netherlandsewell.com

Company type

Private

Founded year

1961

Operating status

Operating

Headcount range

251–500 employees

Short description

Netherland, Sewell & Associates is a privately held, Dallas- and Houston-based petroleum consulting firm founded in 1961 that provides integrated engineering, geological, geophysical, petrophysical, and economic analyses — most notably SEC-compliant reserves reports and audits — to oil and gas companies, NOCs, financial institutions, and government agencies worldwide.

Ownership category

akta.pro rank

Product category

Petroleum Consulting Services

NAICS

Other Scientific and Technical Consulting Services (54169)

SIC

Services-Engineering, Accounting, Research, Management (8700), Oil & Gas Field Exploration Services (1382)

akta.pro primary industry

Instrumentation, Controls & Automation Engineering Consulting (BPAHAIAM)

Keywords

• Petroleum property analysis
• SEC reserves reporting
• Reservoir simulation services
• Upstream energy consulting
• Oil and gas reserves audits

Headquarters

HQ city

Dallas

HQ country

United States

HQ region

North America

Offices2 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Marketing or Sales, Technology or R&D, Infrastructure

Revenue model

1. Professional Consulting Services: NSAI generates revenue through professional consulting fees for reserves reports and audits, technical studies, economic evaluations, and advisory services. Services include SEC reserves reports, acquisition and divestiture evaluations, reservoir simulation, equity determinations, and project finance certifications. Revenue is project-based with engagements ranging from single-property evaluations to comprehensive multi-disciplinary field studies.
2. Government and National Oil Company Contracts: Contracts with government agencies and national energy companies for petroleum property assessments, such as the contract with Barbados National Energy Company (BNECL) for Woodbourne oilfield evaluation.

Pricing tiers

Go-to-market motion3 records

Distribution channels3 records

Marketing channels5 records

Core offering

NSAI is an integrated petroleum consulting firm that provides engineering, geological, geophysical, petrophysical, and economic analysis of upstream oil and gas properties for industry, financial organizations, and government agencies. Its flagship offering is SEC-compliant reserves reporting and audits, complemented by services spanning acquisition/divestiture evaluations, project finance certifications, reservoir simulation, equity determinations, and unconventional resource analyses delivered by approximately 55 reservoir engineers, geoscientists, and petrophysicists plus 70 engineering and geology analysts.

Product overview

Netherland, Sewell & Associates, Inc. (NSAI) is a petroleum consulting firm offering a comprehensive suite of integrated engineering, geological, geophysical, petrophysical, and economic services for the upstream energy industry. The company's core offerings include SEC Reserves Reports & Audits (the firm's #1 recognized service), alongside 16 specialized consulting services covering the full asset lifecycle: acquisition/divestiture evaluations, carbon capture/utilization/storage certifications, coal seam gas studies, competent person's reports, deepwater development studies, enhanced recovery projects, equity determinations, gas storage studies, GHG management, helium resources evaluations, litigation support, midstream consulting, operations engineering, project finance certifications, prospective resources assessments, reservoir simulation, and unconventional oil & gas evaluations. Additionally, NSAI offers educational seminars including Oil & Gas Property Evaluation Seminars and CCS Seminars as complementary training services. The company operates two Texas offices (Dallas and Houston) and serves clients in over 100 countries worldwide.

Differentiator

Problem solved

Functional benefit

Products and services

• SEC Reserves Reports & Audits SEC-compliant reserves reporting and audits trusted by the financial community for annual reporting, IPOs, and bond offerings, delivered as the firm's flagship and #1 recognized service.
• Acquisition and Divestiture Evaluations Integrated team of engineers and geologists advising clients on potential acquisitions and divestitures of oil and gas assets, including data room attendance, independent analysis, and comprehensive reserves reporting.
• Carbon Capture, Utilization & Storage (CCUS) Certifications Certification of subsurface aspects for carbon capture projects, including storage capacity assessment, dynamic modeling, and economic quantification for carbon injected into depleted hydrocarbon-bearing formations or aquifers.
• Coal Seam Gas Development Studies Comprehensive CSG/CBM project evaluations including geologic assessment, model construction, performance assessments, reservoir simulation, and development program planning for coal seam gas assets worldwide.
• Competent Person's Reports Expert reports prepared in accordance with international reporting standards for filing with regulatory authorities and stock exchanges including ASX, HKEX, LSE, OSE, SGX, TSX, and others.
• Deepwater Development Studies Focused experience in deepwater depositional environments including exploration studies, reserves estimation, development planning, field studies, and regional studies in Gulf of Mexico and international deepwater projects.
• Enhanced Recovery Projects Evaluations ranging from initial project screening to in-depth field studies for enhanced recovery methods including CO2, steam, polymer, nitrogen injection, SAGD, ASP processes, and WAG injection.
• Equity Determinations Independent evaluations to determine equity ownership of current and produced volumes, including preliminary reports, rebuttal documents, and advisory services for unitization laws and equity determination procedures.
• Gas Storage Studies Over 30 years of gas storage reservoir evaluation experience including geologic assessment, reservoir integrity analysis, hysteresis analysis, material balance, simulation, and optimization programs.
• Greenhouse Gas (GHG) Management and Carbon Intensity Services including Scope 1, 2, and 3 GHG emissions estimation, attestation reports, climate-related financial disclosures, emissions reduction programs, and carbon offset project evaluations.
• Helium Resources Evaluations Quantification of in-place and recoverable helium volumes from initial project screening and feasibility studies to in-depth field evaluations, utilizing standard engineering and geoscience methods.
• Litigation Support & Dispute Resolution Expert witness services and comprehensive technical assessments for arbitration, mediation, or litigation support including reserves valuations, lease validation, and operational disputes.
• Midstream Consulting Services Technical expertise to help midstream companies understand oil and gas acreage providing volumes to their assets, including development potential estimation and review/opinion letters.
• Operations Engineering Services Field operations, facilities planning and design, and drilling specialists providing strategic programs, cost reduction recommendations, and onsite facilities inspections.
• Project Finance Certifications Reserves certifications for project financing, serving as advisor to lending institutions, commercial banks, credit export agencies, and credit rating agencies.
• Prospective Resources Assessments Independent assessments of prospective resources including probabilistic volumetric assessments, prospect risk assessments, and ranked portfolio analysis for exploration decisions.
• Reservoir Simulation Over 30 years of reservoir simulation expertise using black oil and compositional models, proficient with major simulation software including Eclipse, Nexus, tNavigator, Rubis, IMEX, and GEM.
• Unconventional Oil & Gas Evaluations Expertise in all major unconventional plays including shale, tight gas, and coalbed methane, with regional mapping systems, public production databases, and development strategy optimization.
• Oil & Gas Property Evaluation Seminars Highly regarded educational seminars for non-technical financial professionals covering reserves evaluations, report interpretation, and petroleum industry fundamentals, offered in multiple global locations.
• Carbon Capture & Sequestration (CCS) Seminars Dedicated half-day seminars on CCS geologic evaluations, subsurface uncertainty, SRMS definitions, and case studies for professionals in the CCS industry and oil and gas finance.

Quantifiable outcome

• NSAI reports are highly trusted by the investing and financial community for annual reporting, IPOs, and bond offerings
• +2 more outcomes

Named customers28 records

Segments5 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

One partnership is on record.

• Barbados National Energy Company (BNECL)coreStrategic or Co-development Partner · 24 March 2026BNECL awarded a contract to NSAI to assess and maximize the remaining value of its mature Woodbourne oilfield, Barbados' primary onshore oil-producing asset. The contract covers reservoir performance evaluation, economic assessment, and potential projects including well rehabilitation, exploration, and secondary recovery, with current production at 300-400 barrels of oil per day and 0.7 million cubic feet of natural gas daily. Barbados is the Caribbean's third-largest oil and gas producer after Trinidad and Tobago and Cuba.

Scale indicators5 records

Recent moves5 records

Expansion highlights6 records

Direct peers

• Ryder Scott Company: Ryder Scott is a leading independent petroleum reserves and resource evaluation firm providing SEC-compliant reserves reports, A&D advisory, and reservoir studies. It is one of NSAI's closest direct competitors in the U.S. reserves-reporting market with a similar client base of E&Ps and financial institutions.
• DeGolyer & MacNaughton: DeGolyer & MacNaughton is a long-established petroleum consulting firm specializing in reserves evaluations, geological and engineering studies, and SEC reserves audits. It competes head-to-head with NSAI for major reserves-reporting mandates from supermajors, NOCs, and financial institutions globally.
• McDaniel & Associates Consultants: McDaniel & Associates is a Calgary-based petroleum consulting firm providing reserves audits, resource evaluations, and reservoir engineering services. It is a primary direct competitor to NSAI in Canadian and international markets, particularly for SEC reserves reporting and Competent Person's Reports.
• Sproule (now part of ERCE): Sproule, now operating under ERCE, provides independent reserves audits and resource evaluations for upstream oil and gas companies globally. It is a direct peer in the Competent Person's Report and reserves certification space, particularly for listings on international stock exchanges.
• Cawley, Gillespie & Associates: Cawley, Gillespie & Associates is a Texas-based petroleum engineering firm specializing in reserves evaluations, SEC audits, and acquisition/divestiture due diligence. It competes with NSAI for reserves-reporting and engineering advisory work from mid-sized and independent E&P companies.
• Forrest A. Garb & Associates: Forrest A. Garb & Associates is an international petroleum consulting firm offering reserves evaluations, economic analyses, and reservoir engineering. It competes with NSAI in reserves reporting and technical studies for global E&P and NOC clients.
• LaRoche Petroleum Consultants: LaRoche Petroleum Consultants provides independent petroleum engineering, reserves audits, and reservoir studies. It is a comparable specialty consultancy competing with NSAI in the mid-market reserves-reporting segment.
• Lee Keeling & Associates: Lee Keeling & Associates is a Tulsa-based independent petroleum engineering firm offering reserves evaluations, prospect appraisals, and economic analyses. It is a direct peer in U.S. onshore reserves-reporting and engineering consulting.

Broad incumbents

• Wood Mackenzie: Wood Mackenzie (a Verisk business) is a global energy research and consulting firm providing upstream commercial analysis, asset valuations, and energy transition insights. It is a broader incumbent that overlaps with NSAI on A&D due diligence, asset valuations, and reserves benchmarking for supermajors and NOCs.

Emerging players

• Rystad Energy: Rystad Energy is an independent energy research and business intelligence company providing upstream analytics, reserves databases, and asset-level evaluations. It is an emerging player that increasingly overlaps with NSAI on data-driven reserves analysis and upstream commercial intelligence for E&P and finance clients.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/netherlandsewellandassociatesinc

Revenue estimate

Valuation estimate

Number of profiles

Profiles9 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Netherland, Sewell & Associates