| E&A |
Exploration and Appraisal. |
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| E&P |
Exploration and Production. |
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| Eccentralisation |
The degree by which a tool is displaced away from the centre of the well. |
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| Electron Density |
The parameter actually measured by the FDR, related to density by calibration and/or characterisation. |
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| Encoder |
An electrical device for measuring rotation. Fitted to a measure wheel on a winch unit to determine the amount of cable payed out. |
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| Enhanced oil recovery |
A process whereby oil is recovered other than by the natural pressure in a reservoir. |
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| Exploration drilling |
Drilling carried out to determine whether hydrocarbons are present in a particular area or structure. |
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| Exploration phase |
The phase of operations which covers the search for oil or gas by carrying out detailed geological and geophysical surveys followed up where appropriate by exploratory drilling. |
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| Exploration well |
A well drilled in an unproven area. Also known as a "wildcat well". |
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