What Geolog International does

Geolog International B.V. is a Dutch private limited company headquartered in Amsterdam that provides wellsite geosciences and drilling optimization services to the international oil and gas industry. Founded in 1982, the company delivers end-to-end Real Time Operations Center (RTOC) solutions built on WITSML and ETP real-time data transmission technology, combined with wellsite geology, operations geology, and advanced pore pressure and fracture gradient analysis. Its service offering targets complex drilling environments, particularly HPHT (high-pressure, high-temperature) wells and deepwater operations, with the core value proposition being drilling optimization and non-productive time mitigation for international oil and gas operators.

The company operates a global service platform spanning more than 40 countries and supported by 230 mobile laboratories deployed at client well sites, with a headcount in the 1,001-5,000 range. Revenue is generated primarily through professional services contracts for wellsite geosciences personnel and subsurface support, with pricing not publicly disclosed. The business model is asset-light in technology but capital-intensive in its mobile laboratory fleet and globally distributed field workforce. In January 2026, Geolog expanded its specialized services portfolio through the bolt-on acquisition of Quad Ltd and QO Inc., adding advanced pore pressure and fracture gradient analysis capabilities. In February 2026, it formed a strategic digital alliance with Bardasz Group LLC, including a minority equity investment, to integrate Bardasz's real-time data transmission technology with Geolog's wellsite service footprint. Leadership includes Richard A. Calleri as Chief Executive Officer, though detailed management team information is not disclosed in the source data.

Name

Geolog International

Legal name

GEOLOG International B.V.

Website

https://geolog.com

Company type

Private

Founded year

1982

Operating status

Operating

Headcount range

1,001–5,000 employees

Short description

Geolog International B.V. is a Netherlands-based private provider of wellsite geosciences and drilling optimization services to international oil and gas operators, operating across 40+ countries with 230 mobile laboratories.

Ownership category

akta.pro rank

Product category

Oilfield Services

NAICS

Geophysical Surveying and Mapping Services (541360), Support Activities for Oil and Gas Operations (213112), Support Activities for Mining (2131)

SIC

Oil & Gas Field Exploration Services (1382), Oil & Gas Field Services, Nec (1389)

akta.pro primary industry

Seismic & Geoscience Services (Acquisition, Processing, Interpretation) (EUALABAK)

akta.pro secondary industries

Geotechnical & Subsurface Engineering Consulting (BPAHAIAB), Mineral Exploration & Geoscience Services (Geology, Geophysics, Geochemistry, Resource Modeling) (IMAKAKAA)

Keywords

• Wellsite geosciences services
• Drilling optimization solutions
• Pore pressure analysis
• Real-time operations center
• Oilfield geology services

Headquarters

HQ city

Amsterdam

HQ country

Netherlands

HQ region

Europe

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Wellsite Geosciences Services: Professional services revenue from providing wellsite geology, operations geology, and subsurface support services to oil and gas operators

Core offering

GEOLOG provides wellsite geosciences and drilling solutions to international oil and gas operators, delivering real-time operations center (RTOC) support, drilling optimization, non-productive time mitigation, and specialized wellsite geology services. Its offering is enhanced by pore pressure prediction and fracture gradient analysis, executed through 230 mobile laboratories and field personnel deployed across 40+ countries. The portfolio is supported by real-time data transmission technology (WITSML/ETP) integrated via its strategic alliance with Bardasz Group LLC.

Product overview

Geolog International B.V. is a leading independent provider of wellsite geosciences and drilling solutions to the energy industry, operating a platform-plus-services model. The company offers a unified portfolio consisting of its core wellsite geosciences and drilling solutions platform combined with specialized pore pressure and fracture gradient analysis services acquired through Quad Ltd and QO Inc. This integrated suite delivers comprehensive solutions for complex drilling environments including HPHT wells and deepwater operations, supported by a global operational footprint spanning over 40 countries and 230 mobile laboratories.

Differentiator

Problem solved

Functional benefit

Products and services

• Wellsite Geosciences and Drilling Solutions
• Wellsite Geology and Pore Pressure Analysis Services Specialized wellsite geology, operations geology, and advanced pore pressure and fracture gradient analysis services for complex drilling environments including HPHT wells and deepwater operations, integrated via the Quad Ltd and QO Inc. acquisition.

Segments1 record

Ideal customer profiles1 record

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Partnerships

One partnership is on record.

• Bardasz Group LLCcoreStrategic or Co-development Partner · 11 February 2026Strategic digital alliance combining Bardasz's WITSML and ETP real-time data transmission technology with GEOLOG's global operational footprint spanning over 40 countries and 230 mobile laboratories. The partnership strengthens delivery of end-to-end RTOC solutions for drilling optimization and non-productive time mitigation. As part of the alliance, GEOLOG has made a minority investment in Bardasz, providing financial flexibility to accelerate Bardasz's product roadmap and global expansion.

Scale indicators2 records

Recent moves4 records

Expansion highlights5 records

Direct peers

• AGR (Aker Solutions): AGR, part of Aker Solutions, is a well management and subsurface consulting firm that supports oil and gas operators across drilling programs. It overlaps with GEOLOG in wellsite geology, operations geology, and pore pressure / fracture gradient services for international drilling campaigns.
• Core Laboratories: Core Laboratories is a global provider of reservoir description and production enhancement services to the oil and gas industry, with a strong portfolio of wellsite and laboratory-based geosciences. Highly comparable to GEOLOG given the overlap in formation evaluation, reservoir and pore pressure analysis, and global wellsite service delivery.
• RPS Group (Tetra Tech): RPS Group, now part of Tetra Tech, provides subsurface, geoscience, and well engineering consulting to the energy sector. Comparable to GEOLOG in offering project-based wellsite geosciences and subsurface analysis services to international oil and gas clients.
• Expro Group: Expro Group provides well construction, well intervention, and flow measurement services to oil and gas operators globally. It is comparable to GEOLOG as a focused, technology-led OFS provider serving complex drilling environments with specialized wellsite expertise.

Broad incumbents

• Halliburton: Halliburton is a major global OFS provider with significant drilling services, drilling optimization, and formation evaluation capabilities. It overlaps with GEOLOG in wellsite geology and pore pressure-related services, but addresses a much wider customer base and product set.
• SLB (Schlumberger): SLB is the world's largest oilfield services company with deep capabilities in drilling, evaluation, and digital wellsite solutions. It competes with GEOLOG across wellsite geosciences, real-time drilling optimization, and pore pressure / fracture gradient services, but as part of a much broader portfolio.
• CGG: CGG is a global geoscience company providing seismic acquisition, subsurface imaging, and reservoir characterization to oil and gas operators. Comparable to GEOLOG on the geoscience / subsurface analysis dimension, though it is much larger and more focused on seismic data services.

Emerging players

• Ikon Science: Ikon Science provides rock physics, pore pressure prediction, and geomechanical analysis software and services to oil and gas operators. It is a partial overlap peer to GEOLOG's pore pressure and fracture gradient analysis business, focused on a more software-centric delivery model.
• Paradigm (Emerson E&P Software): Paradigm, part of Emerson's E&P software business, provides subsurface modeling, reservoir characterization, and drilling-related geoscience software. Comparable to GEOLOG in the subsurface and geoscience services domain, but with a primarily software-based delivery model.

Regional players

• Petroleum Development Oman (PDO) — Drilling Services / Well Engineering Function: Several national oil companies and integrated service firms (e.g., ADNOC Drilling, Saudi Aramco's drilling function) operate captive or in-house wellsite geosciences and drilling optimization capabilities in the Middle East that directly compete with the kind of services GEOLOG provides in complex HPHT and deepwater environments in the region.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat4 records

Key risks5 records

Key highlights6 records

Customer concentration

• Xx.com/_geolog

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Subsidiaries2 records

Funding overview

Funding rounds

Investors

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

M&A2 records

Investments3 records

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

Frequently asked questions about Geolog International