| Word | Definition |
| Cable-Tool Rig | The birth of the modern drilling technique developed in 1848 by Russian engineer F.N. Semyenov. A heavy chisel-like bit which was suspended on a cable... |
| Cambrian | A geologic era that is 542 million years ago at the end of the Proterozoic eon and ended 488.3 million years ago with the beginning of the Ordovician ... |
| CAOF (Calculated Absolute Open Flow) | The flow rate of a gas well's theoretical producing capability per day. |
| Cap Rock | A layer of non-porous rock that prevents petroleum from migrating to the surface. Also referred to as a geological trap. |
| Capillaries | Minute spaces, cracks or pores in rock through which hydrocarbon fluids move in response to natural forces. |
| Carbon Dioxide CO2 | a non-toxic gas produced from decaying materials, respiration of plant and animal life, and combustion of organic matter, including fossil |
| Carbonate | Any member of a family of minerals that contain the carbonate ion, CO 3 2- , as the basic structural and compositional unit. The carbonates are among ... |
| Carboniferous | A geological period 300 - 400 million years old. |
| Casing | Also called tubing, it is pipe that is inserted into the well and then cemented into place. This prevents the contamination of any underground f... |
| Casing-Head Gasoline (Naphtha) | A highly volatile liquid which is separated from natural gas at the wellhead and was once used as unrefined gasoline. |
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