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| class name | description | member of ... | status |
|---|---|---|---|
| wildcat | A exploratory well drilled in an unproved area to test for a new field, a new pay, a deeper reservoir, or a shallower reservoir. Also known as an exploration well. | provisional | |
| new-field wildcat | An exploratory well drilled to search for an occurrence of hydrocarbon at a relatively considerable distance outside the limits of known pools of hydrocarbon, as those limits were understood at the time. | wildcat | provisional |
| new-pool wildcat | An exploratory well drilled to search for additional pools of hydrocarbon in close proximity and at the same stratigraphic level as known pools. | wildcat | provisional |
| shallower-pool wildcat | An exploratory well drilled to search for additional pools of hydrocarbon in close proximity, but at a shallower stratigraphic levels than the known pools. | wildcat | provisional |
| deeper-pool wildcat | An exploratory well drilled to search for additional pools of hydrocarbon in close proximity to known pools of hydrocarbon but at a deeper stratigraphic levels than the known pools. | wildcat | provisional |
| outpost wildcat | An exploratory well drilled to search for additional pools of hydrocarbon or to extend the limits of a known pool by searching in the same interval at some distance from a known pool. | wildcat | provisional |
| stratigraphic test | A research well drilled for the purpose of gathering geologic information on the stratigraphy of an area. A C.O.S.T. well would be included in this category. | research | provisional |
| appraisal | A well drilled into a formation shown to be potentially productive of oil or gas by an earlier well for the purpose of obtaining more information about the reservoir. Also known as a delineation well. | provisional | |
| exploratory appraisal | An appraisal well, generally drilled in an area unknown to be part of the reservoir, whose purpose is to determine the extent of the reservoir. | appraisal | provisional |
| confirmation appraisal | An appraisal well, generall drilled in a location interpreted to be in the reservoir, whose purpose is to confirm the interpretation. | appraisal | provisional |
| development | A well drilled in a zone in an area already proved productive. | provisional | |
| infill development | A development well drilled to fill in between established wells, usually part of a drilling program to reduce the spacing between wells to increase production. | development | provisional |
| injection | A well that is drilled with the purpose of injecting fluids into a reservoir, usually for enhanced recovery. | provisional | |
| general service | A well drilled to provide a service such as subsurface fluid monitoring, waste disposal, fluid storage, and blowout relief. Not necessarily an E & P well. | provisional | |
| monitor | A service well drilled to allow continuous or periodic measurement of a property of the subsurface through time. | general service | provisional |
| waste disposal | A service well drilled for the purpose of injection of sewage, industrial waste, or other waste fluids into the subsurface for disposal. | general service | provisional |
| fluid storage | A service well drilled for the purpose of injection of fluids into a reservoir for storage and later withdrawal. | provisional | |
| blowout relief | A service well drilled with the specific purpose to provide communication at some point below the surface to another well which is out of control. | provisional | |
| borehole re-acquisition | A service well drilled to intersect another well below the surface for the purpose of extending the life of a well whose surface borehole has been lost or damaged. | provisional | |
| drilling test | A research well drilled to test the suitablity of a particular type of equipment or drilling practice. | research | provisional |
| mineral | A non-E&P well drilled for the purpose of locating and/or extracting a mineral from the subsurface, usually through the injection and/or extraction of mineral-bearing fluids. | provisional | |
| research | A well drilled with the purpose of obtaining information on the stratigraphy, on drilling practices, for logging tests, or other such purpose. It is not expected to find economic reserves of hydrocarbons. | provisional |
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