Well definitions

Source: Regulations relating to resource management in the petroleum activities (the Resource Management Regulations).

Appraisal well: exploration well drilled to establish the extent and size of a petroleum deposit that has already been discovered by a wildcat well.

Development well: a generic term for wells used for production of petroleum, production wells, injection wells and observation wells, and possible combinations thereof. 

Exploration well: a well drilled in order to establish the existence of a possible petroleum deposit or to acquire information in order to delimit an established deposit. Exploration well is a generic term for wildcat and appraisal wells.

Injection well: a development well or test development well used for injection of gas, water or other medium.

Junked well: a well, which during the drilling phase, has been permanently plugged for technical reasons.

Multilateral well: well drilled to produce and/or inject from several well paths simultaneously.

Observation well: a development well or test development well used to measure specific well parameters.

Other boreholes: holes drilled in order to acquire information on the rock characteristics and/or carry out geotechnical examinations for the location of installations and which are not drilled to discover or delimit a petroleum deposit or to produce or inject petroleum, water or other medium.

Production well: a development well used for production of petroleum or of water for injection purposes.

Subsea completed well: development well completed with the wellhead either on the seabed or on a template, and connected to a production or injection facility.

Technical sidetracking: necessary drilling sideways (new well track) in order to bypass unforeseen obstacles in the well and where the geological and drilling operational well target remains unaltered.

Test development well: a well used for test development.

Well: a well is a borehole which is drilled in order to discover or delimit a petroleum deposit and/or to produce petroleum or water for injection purposes, to inject gas, water or other medium, or monitor well parameters. There are several categories of wells. A well may consist of one or several well paths and may have one or several termination points.

Well path (well bore): designates the location of the well from one termination point to the wellhead. A well path may consist of one or more well tracks.

Well target: geological well target: that or those geological unit(s) into which the well is to be drilled, drilling operational well target: the termination point of the well path (includes geographical coordinates and depths in meters).

Well track: that part of a well path which extends from a point of drilling out on the existing well path to a new termination point for the well.

Wildcat well: exploration well drilled to establish (prove) whether petroleum exists in a potential petroleum deposit.

Updated: 12/11/2021

Did you find what you were looking for?

Do not enter personal information here.

We don't answer request from this form. We only use this response to improve the website.