3-D Network™ Company
USA, 3D scouting and information services

4D Technology, Inc.
USA; out of Columbia University; advanced computer simulation technology for 4D seismic analysis and interpretation

A2D Technologies, Inc.
USA, well log data conversion, management, delivery, and interpretive software provider

Aberdeen Drilling Consultants Ltd.
UK, drilling consultants

Accenture
USA; management and technology consulting organization

ACDAT System Services Ltd.
Canada; database, networks and systems management to information system departments in the oil and gas industry

Adams Pearson Associates Inc.
Canada, theoretical and practical consultancy services

ADB Systems
Norway, software vendor focused on integrated eProcurement and Enterprise Asset Management software solutions

Advanced Data Solutions
USA, Geophysical Software Development, Seismic Imaging Services, Software Engineering

Advanced Extraction Technologies, Inc.
USA, technology licensing, engineering services, Enhanced NGL Recovery Plants to Refinery Off-Gas Recovery

Advanced Geomechanics
Australia, geotechnical design

Advanced Geotechnology Inc.
Canada, advanced modeling and simulation expertise for borehole stability, sand production, fractured reservoirs, casing integrity, hydraulic fracturing, permafrost