Antonio Calleri

Society of Petroleum Engineers, Inc. provides petroleum engineering services. The non-profit company is based in Allen, TX and has subsidiaries in United States, India and Canada.

Pinnacle Technologies, Inc. provides engineering, oil fracturing, and other oil and gas related services. It offers surface and downhole micro seismic monitoring, as well as surface and downhole micro deformation analysis. The company was founded in 1992 and is headquartered in Houston, TX.

Evolution Engineering, Inc. provides engineering services. It offers Next Generation Measurement-While-Drilling technology such as Evolution, EvoOne, and Evo Powered that provides products focused on innovation and reliability for the Measurement-While-Drilling (MWD) market, system for onshore oil and gas drilling, and communication and sensor systems technology. The company was founded in and is headquartered in Calgary, Canada.

W-Technology, Inc. provides tools for use with directional drilling equipment. Its products include wet connectors, rotatable connectors, running gear, centralizers and handling tools. The company was founded by Alan Carmichael and Harold Kreutzer in 1992 and is headquartered in Houston, TX.

Abrado, Inc. provides cleanout tools, chemical stimulation treatments and diagnostic technology services to the drilling sector. It offers well abandonment, and section milling services. The company was founded by Alexander Esslemont and C. Mitchell Cox in 2009 and is headquartered in Houston, TX.

Spears and Associates, Inc. provides business planning, analysis, activity forecasts, and market research-based consulting services to the worldwide petroleum equipment and service industry. Its services are divided between off-the-shelf products such as the oilfield market report; drilling and production outlook; oilfield Logix; and private and multi-client consulting. The company was founded by Robert Spears in 1965 and is headquartered in Tulsa, OK.

Gaffney, Cline & Associates, Inc. provides global oil and gas consulting services to clients across the upstream, midstream, and downstream sectors of the oil and gas industry. The company is headquartered in Houston, TX.

Gaffney, Cline & Associates Ltd. provides consultancy services to the oil and gas industries. It offers technical, operational, management, and commercial advice services. The firm serves oil and gas companies, national oil companies, government, and private investors. The company was founded by Peter D. Gaffney and Ben Cline in 1962 and is headquartered in Alton, the United Kingdom.

WellDynamics BV provides well completion technology to the oil industry. It provides interval control valves, zonal isolation products, completion components, electrical and hydraulic systems, optical fiber products, and reservoir solutions. The company was founded in 2001 and is headquartered in Hague, the Netherlands.

Scientific Drilling International, Inc. provides directional drilling and wellbore navigation, surveying and logging services. It also provides survey and steering, measurement and logging while drilling, production logging, ranging, directional drilling, wellbore navigation, and surveying and logging services. The company was founded in 1969 and is headquartered in Woodlands, TX.

Resman AS engages in the provision of wireless reservoir surveillance. It offers continuous reservoir monitoring, inter-well water and gas diagnostics, inter-well saturation, and near-well oil saturation services. The company was founded by Fridtjof Nyhavn and Anne Dalager Dyrli in 2005 and is headquartered in Trondheim, Norway.

Geodynamics Corp. provides computer system design services. The company is headquartered in Torrance, CA

Sperry Drilling Services provides directional drilling services to oil and gas customers. The company also offers measurement-while-drilling and logging-while-drilling systems used to collect geographical surveys and drilling information. The firm is headquartered in Houston, TX.

Varel International Energy Services, Inc. manufactures and distributes specialty drill bits through its subsidiaries. It produces bits used for drilling oil and gas wells, mines, and geothermal infrastructure. The company was founded in 2008 and is headquartered in Carrollton, TX.