Dana Technical Services
Process Design, Gas Processing and Sulphur Recovery Expertise

Darby Equipment Company
"Serving the world's pipeline industry since 1982."

DARTT Valve Company, Ltd.

Darwin Oil Company, LLC
"explores for hydrocarbons nationally and internationally by marketing high grade prospects. Area of emphasis domestically is the Permian Basin of West Texas and S.E. New Mexico. International emphasis is in Ecuador and Argentina."

Data Retrieval Corporation
makers of SPIDR, "a self-powered, portable system that ... permit(s) pressure transient testing of gas wells without going down-hole...."

Data Storage Technologies
"we specialize in the reading and reformatting of workstation and mainframe magnetic tape" (including well log tapes)

Datalog Technology Inc.
"a Canadian oil & gas service company, supplying the international petroleum industry with mud logging and data acquisition equipment and services for the maximum evaluation of our clients' drilling projects."

Dave Easom Production Company "located in historic Natchez, Mississippi, where our company philosophy is to generate, drill, develop, and produce oil and gas profitably."

David Fox Associates
"an upstream petroleum consultancy. We can demonstrate an extensive track record of adding value to international upstream petroleum projects at every phase of their life cycle"

Davis-Lynch Inc.

Dawson Geophysical
"acquires and processes 3-D seismic data used in determining whether subsurface geologic conditions appear favorable for accumulations of oil and natural gas."

DeGolyer and MacNaughton
"Worldwide Petroleum Consulting"

Deep South Chemical, Inc.
"a worldwide provider and leading single source of first class chemicals and specialty wellbore cleanup tools for the oil and gas industry."

Delmar Systems Inc.
"the leading provider of mooring services to the offshore industry. "

Delta Environmental Consultants, Inc.
"Solving Environment - related business problems worldwide."

Denbury Resources Inc.
"oil and gas exploration, acquisition, development, and production company."

Derek Resources Corporation
"defined a corporate strategy focused on establishing new production from reservoirs containing significant quantities of oil, which were previously uneconomic to recover using conventional means. "

Desco International
"an oilfield equipment repairs/supply workshop based in United Arab Emirates servicing oil & gas sector and drilling contractors in the region and neighboring countries"

Descon Engineering
"a premier engineering and construction firm offering a comprehensive package of services to clients in Pakistan and the Middle East"

Detechtion Technologies LLC
"The future of compressor optimization"

Deutsche Montan Technologie GmbH
"Independent technology services in testing, certification, consulting, engineering, measuring and development in Germany and abroad with emphasis on raw material, safety and infrastructure"

Devin International, Inc.
"built a reputation on having unique and hard to find specialty equipment. Our experienced staff insures you are provided equipment that make your job site safer, allow you to save time and work more efficiently. Whether your project is on land or offshore, shelf or deep water, DEVIN's inventory of products provide the solution for costly down time."

Devon Energy

Dexsil Corp.
"manufactures portable test kits and instruments for the detection and quantification of contaminants in soil, water and oil."

DH Instruments, Inc.
"founded in 1980 with one objective... to provide superior calibration solutions through innovative technology, first rate service and uncompromising metrological integrity."

DHV International
"provides downhole video services to the oil and gas industry for fast, accurate diagnosis of wellbore problems. "

Diamond Products International
" a global supplier of quality PDC Bits, Natural Diamond Bits, and Coring Services. "

Diamond Services Corporation
"Serving the entire Gulf Coast"

Diaz Resources Ltd.
"a newly re-organized oil and gas company managed and controlled by a team with considerable experience and success in the exploration field... presently focusing its efforts on natural gas exploration in southern Alberta."

Dickirson Corp.
" a full-line manufacturer and distributor of drilling, well service and transportation products for the oil and gas fields of northeastern United States and the World."

Digital Oilfield
"real business solutions for real people"

Dion & Sons
"founded in 1930 ... to supply fuels and oils to Southern California's drilling industry. Today, we are proud to continue a tradition of providing quality products and superior service to a wide variety of industrial users"

Directional Drilling Contractors LLC
", a leader in innovation design and implementation of oilfield tools and are continually striving to find the most effective way to fulfill the needs of our customers in all aspects of directional drilling."

Directional Technologies, Inc.
"provides horizontal directional drilling, horizontal well installations, and well installations related services such as well placement, design, and development. "

Dolphin a.s.
"a Fred. Olsen related Company providing the offshore industry with efficient and reliable services within the areas of Rig Management, Well Services, Subsea Contracting and Engineering"

Domain Engineering
"provides engineering services for the petroleum, gas processing and petro-chemical industries. Services include process modeling, detailed design, debottlenecking, optimization, procurement, construction and project management. "

Dominion Exploration and Production
"the natural gas exploration and production subsidiary of Dominion. The company is one of the largest independent natural gas and oil operators. "

Dormer Engineering
"Soil Drilling, Soil Sampling & Associated Equipment....design and/or manufacture special equipment to your requirements with minimal delay."

Double Eagle Petroleum and Mining Company
"with principal activities in the Rocky Mountain Region .... The company acquires, drills, develops, and operates oil and gas properties."

Douglas Drill Services, Inc.
"As international specialists in parts, service, and repairs, we can ship parts, do repairs in-house, or send field service. From Texas to Thailand, Columbia to China, we'll do whatever it takes to get you up and running quickly. We service and sell new an used waterwell, oil & gas drills and drill parts."

Dravis Interests, Inc.
"Consulting and Training Services in Carbonate Geology Applied to Petroleum Exploration and Reservoir Development "

Drill Core Measurements [Germany]
"Rock stress measurements"

Drilling Records
"over 30 years of data services experience and is well recognized by Operators, Drilling Contractors and Service Companies as a major source of "Offset Drilling Data" used in formulating "AFE'S", "Bidding", and "Programming" for the drilling of new wells. "

Drilling Systems (UK), Ltd.

Drives, Incorporated
"has become a leading manufacturer of ANSI Precision Roller Chain, Pintle Chain, Agricultural Conveyor Chain, Engineering Class Chain, Oil Field Roller Chain and Auger products. "

Drucker Inc.
"an international petroleum resource company specializing in the exploration and development of oil and gas projects."

Due North Resources
"Geological and Environmental consulting."

Dunelm Drilling Company Ltd.
"has been successfully operating for over 30 years in the specialist field of Site Investigations and Geotechnical Engineering"

Dynalco Controls
"designs and manufactures rugged industrial instrumentation and control equipment. Our products are at work in a multitude of extreme environments including temperature, vibration, moisture, dust, and hazardous locations."

Dynamic Oil & Gas, Inc.
"a rapidly growing, ...natural gas based energy company with a strong position in Western Canada."

Dynatec Drilling Services Division
"offers a complete range of exploration and general drilling services to the international mining, geothermal and geoscientific communities."