Cyratron Ltd.
- Manufacturer of instrumentation and mud logging units for hydrocarbon and rock analysis.
- http://www.cyratron.com/

Horizon Well Logging, Inc.
- Provides mudlogging, wellsite geology, rig instrumentation, and H2S safety.
- http://www.horizon-well-logging.com/

PetroServices
- Mud logging services, equipment, and field personnel for Europe, Middle East and Russia.
- http://www.petroservices.de/

The Mudlogging Company, Inc.
- Equipment manufacturing and field service personnel for computerized mud logging with real time data transmission.
- http://www.mudloggingco.com/

GEO-RS Inc.
- Mud logging, geology of near-surface rocks, ground water geology. Based in Toulouse, France.
- http://perso.orange.fr/geo-rs/

Automated Mudlogging Systems
- Mudlogging services or providing automated equipment operated by your staff. Also providing geologic and engineering well-site supervision and consulting.
- http://www.mudlogger.com

Petroleum Mud logging Data Exploration Services
- Petroleum exploration mud logging and geological data recording services.
- http://www.petroleummudlogging.com

Stratagraph Inc.
- Complete mud logging and pressure detection services. Domestic and international work. Gulf Coast emphasis.
- http://www.stratagraph.com/

Geoservices
- Provides mud logging, well testing, DST and reservoir evaluation, early production facilities and well data acquisition.
- http://www.geoservices.com/

Drill-Lab Ltd.
- Mudlogging equipment and services. Operating in Europe.
- http://www.drill-lab.com.pl/

Running Horse Resources Inc.
- Provides well site geologists for mud logging, sample and core collection and supervision of horizontal drilling. Based in Calgary, Alberta.
- http://www.wellsitegeologists.com/

HRH Limited
- Wellsite geology and mud logging. Create logs and charts from customer data. Based in Aberdeen, Scotland
- http://www.hrh.ltd.uk/index.html