| Word | Definition |
| Warranty Contracts | Gas purchase agreements for the sale of natural gas by a producer to a pipeline company wherein the producer warrants it will have available sufficien... |
| Waste Coal | A material that is a byproduct of previous coal processing operations. Waste coal is composed primarily of coal fines, material in which extraneous no... |
| Waste Energy | Fuel from solid waste, landfill gas, methane, digester gas, liquid acetonitrile waste, tall oil, waste alcohol, medical waste, paper pellets, sludge w... |
| Water Injection (WI) | Water is pumped (injected) into infill wells in a producing field. This helps maintain or increase reservoir pressure so production can be maintained ... |
| Well | A hole drilled into the earth to find or produce crude oil or natural gas. |
| Well Logging Instruments | Instruments lowered into a well to provide specific information on the condition of the well. |
| Wellbore | A hole drilled or bored into the earth, usually cased with metal pipe, for the production of gas or oil. |
| Wellhead | The equipment used to maintain surface control of a well. |
| Wellhead Price | The value at the mouth of the well. In general, the wellhead price is considered to be the sales price obtainable from a third party in an arm's l... |
| Wellsite Geologist | A geologist hired by the oil company to monitor cuttings, and examine core samples at the drilling site. |
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