A well drilled as part of an appraisal drilling programme which is carried out to determine the physical extent, reserves and likely production rate of a field.

A well drilled as part of an appraisal drilling program which is carried out to determine the physical extent, reserves and likely production rate of a field.

A well drilled as part of an appraisal drilling program which is carried out to determine the physical extent, reserves and likely production rate of a field.   

uh-prey-zuhl well A well drilled as part of an appraisal drilling programme which is carried out to determine the physical extent, reserves and likely production rate of a field.

A well drilled to evaluate the quality of a hydrocarbon discovery.

A well drilled as part of an appraisal drilling programme which is carried out to determine the physical extent, reserves and likely production rate of a field.  

a well drilled as part of an appraisal drilling programme.

A well or wells drilled to follow up a discovery and evaluate its commercial potential.

a well drilled as part of an appraisal of a field

A Well drilled pursuant to an Appraisal Programme.  

A well drilled to further confirm and evaluate the presence of hydrocarbons in a reservoir that has been found by a wildcat well.

A well drilled to evaluate the size or quality of a hydrocarbon discovery

A well (often more than one) drilled after successful exploratory drilling and hydrocarbon discovery. Appraisal wells help better understand the geology of the reservoir and locate production wells.

Exploration well drilled near a well already in production as part of an appraisal campaign, which is carried out to determine the physical extent and likely production potential of a field.

A well drilled to determine the extent of hydrocarbons discovered inprevious well on the same structure. 

Well drilled after the discovery of oil or gas to establish the limits of the reservoir, the productivity of wells in it and the properties of the oil or gas. See also development well