Reservoir Group is a World-Class Niche Oilfield Services Company
Addressing customer challenges for more than 70 years, we partner with E&P Operators and large services companies to provide tools and expertise during drilling, completions, and production operations. Combining our technical experts, proprietary products, and a high-standard of customer care, we deliver safe, high-quality, and cost-effective solutions. Reservoir Group is a global company headquartered in Houston.
BUILT UPON 70+ YEARS OF EXPERIENCE FROM LEGACY BRANDS

- 1948
DOWDCO
DOWDCO
April 11, 1948DOWDCO provided highly specialized formation evaluation through coring services.
- 1983
Geosearch Logging
Geosearch Logging
April 11, 1983GeoSearch Logging, Inc. provided well logging and environmental testing services for the oil exploration industry in the continental United States.
- 1986
The Mud Logging Company USA
The Mud Logging Company USA
April 9, 1986The Mud Logging Company USA provided expert surface logging services and equipment for the North American oil and gas market.
- 1988
Corpro
Corpro
April 9, 1988Corpro was an international industry leader of coring technologies, with worldwide experience in the most challenging oil and gas offshore provinces including the North Sea, West Africa, Caspian, Middle East, Australasia and Brazil.
- 1992
Canada Tech
Canada Tech
April 17, 1992Canada Tech Corp. designed and manufactured memory tools, gauges, and downhole instruments for the oil and gas industry. The company also offered permanent monitoring tools.
- 1996
StoreCore
StoreCore
April 9, 1996StoreCore provided geo-laboratory services and offered storage/viewing facilities, core preparation and handling (onshore/offshore), and core and sample material tracking in core and sample management.
- 1998
Omega Well Monitoring
Omega Well Monitoring
April 9, 1998Omega Well Monitoring was originated in Aberdeen, UK and manufactured and serviced memory gauges. It offered permanent monitoring systems and solutions as well.
- 2001
X Drilling Tools
X Drilling Tools
April 9, 2001Based in Australia, X Drilling Tools was a niche drilling tool and services company.
- 2001
Total Gas Detection
Total Gas Detection
April 29, 2001Founded in 2001, Total Gas Detection (TGT) provided wireless, pit-based, infrared hydrocarbon detection solutions to the Oil and Gas industry.
- 2002
InfoAsset
InfoAsset
April 17, 2002InfoAsset was an information services company that provided data management services and solutions to the energy sector.
- 2003
WellTools
WellTools
April 17, 2003WellTools designed, manufactured, and supplied well bore tools for the oil and gas industry in the United States, South East Asia, the Middle East, and Europe.
- 2004
Warren & Christian Inc.
Warren & Christian Inc.
April 17, 2004Based in Oklahoma, Warren & Christian Inc. was experienced in the US mudlogging sector, with a fleet of more than 40 wellsite trailers, gas detection equipment and industry standard logging software.
- 2007
Reservoir Group
Reservoir Group
April 17, 2007Reservoir Group is a global provider of specialist oil and gas services and equipment that assists with the evaluation, development and optimization of oil and gas discoveries.
- 2009
Quest Coring
Quest Coring
April 17, 2009Quest Coring was a provider of wireline and conventional coring systems. The company offered drilling tools and provided coring, core handling, diamond bits and on site core measurement services.
- 2009
Wellvention
Wellvention
April 17, 2009Wellvention Ltd. provides well intervention and thru-tubing services for the oil and gas industry worldwide. It provides thru-tubing intervention solutions ranging from sale, rental, and service of thru-tubing fishing, milling, cutting, manipulation, and casing exit tools and equipment to design, engineering, and manufacture
- 2011
Empirica
Empirica
April 9, 2011Reservoir Group forms Empirica as the premier surface logging brand to consolidate its other surface logging companies.
- 2013
ALS Oil and Gas
ALS Oil and Gas
April 17, 2013ALS acquires Reservoir Group.
- 2017
Reservoir Group
Reservoir Group
April 17, 2017Madison Industries acquires Reservoir Group. Reservoir Group is built upon more than 70 years of experience in the Oil and Gas industry through expert companies that are part of the Reservoir Group portfolio.
OUR CORE VALUES GUIDE US IN EVERYTHING WE DO.
Integrity
We believe in winning with integrity and employ the highest ethical standards, demonstrating honesty and integrity in every aspect of our business.
Bias for Action
We act with intention and urgency because we believe decision speed creates tremendous value.
Results
We focus on key metrics that matter to our customers and company, and endeavor to deliver results despite the challenges which inevitably arise.