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Producing Wells - are defined as those that have been drilled into a reservoir and are active, used to produce oil and/or gas from that reservoir including wells that are used for injection of fluids.

Producing Wells (Oil) - are all active wells that have been drilled into an oil or oil and gas reservoir and are used to produce oil (and any associated gas) from that reservoir. They include wells that are used for injection of fluids.

Producing Wells (Gas) - are all active wells that have been drilled into a gas reservoir that has no associated liquids (including condensates stable at the surface). The wells are used to produce only gas and include wells that are used for injection of fluids.

Drilled Wells - are defined as those drilled by drilling rigs with intent to locate and exploit oil and gas resources. They are allocated to the year of spud, except for pre-spudded development wells, allocated to the year of return to the hole.  Sidetracks, drilled from existing well bores, become drilled wells if the original well has seen its rig stand down and the intent is to acquire new data and production.

Exploratory Wells - are defined as the sum of exploration and appraisal wells.

Exploration Wells - are defined as those drilled where a field is suspected (a prospect), to determine the presence of hydrocarbons and collect data to assess the merit of a prospect.

Appraisal Wells - are defined as those drilled during appraisal of a prospect that has been drilled by a successful exploration well.

Development Wells - are defined as all those drilled to produce a field once volumes have been proven by exploratory wells, including producers and injectors.

Surface-Completed Wells - are defined as those offshore wells on (usually fixed) platforms where the valve set (Christmas Tree) is above sea level (dry).

Subsea-Completed Wells - are defined as those offshore wells on (usually floating) platforms where the Christmas Tree is located on the sea floor (wet) and a riser runs to the production platform.


There are 4 drilled well types, quantified and forecast in this website and in the datafiles by Globalshift.

They are split onshore and offshore by water depth, with active wells also recorded

Wells

Vertical axis in chart corresponds to number of wells spudded in year, including stand-alone sidetracks.

Wells in chart include those drilled in exploratory and development categories in onshore environments but excluding CBM.

Full breakdowns are available in datafiles.

Drilled Wells (Onshore) - are defined as those that are not defined as ‘Drilled Wells (Offshore)’. They include wells drilled from shallow water barges in lakes and swamps and wells drilled from onshore sites to tap offshore accumulations.

Drilled Wells (Offshore) - are defined as those that are drilled with rigs in marine environments, including land rigs, such as platform rigs, erected on platforms and artificial islands. The location of the wellhead defines the water depth. ‘Very shallow waters’ have a seabed location beneath marine water depths down to 100m, ‘medium shallow waters’ from >100 to 500m, ‘medium deep waters’ from >500 to 1000m, ‘very deep waters’ from >1000 to 2000m, and ‘ultra deep waters’ from >2000m.

Vertical axis in chart corresponds to number of wells spudded in year, including stand-alone sidetracks.

Wells in chart include those drilled in exploratory and development categories in offshore environments at selected water depths.

Full breakdowns are available in datafiles.

Drilled Wells (Types) Drilled Wells (Locations) Producing (Active) Wells

Oils

Gases

Wells

Reserves