This describes the recovery of oil or gas from a reservoir by artificially maintaining or enhancing the reservoir pressure by injecting gas, water or other substances into the reservoir rock.

This describes the process of separating liquid and gas hydrocarbons and water. This is typically accomplished in a pressure vessel at the surface, but newer technologies allow separation to occur in the wellbore under certain conditions.

This describes the gas that remains after its separation from condensate.

This describes the process to cement casing into the hole. The cement is pumped downhole to the bottom of the well and is forced up a certain distance into the annular space between casing and the rock wall of the drill hole.

Shale gas is a natural gas that is found trapped in within shale formations. Because shales ordinarily have insufficient permeability to allow significant fluid flow to a well bore, most shales are not commercial sources of natural gas. Horizontal drilling is often used with shale gas wells.

This is a natural gas which contains chemical impurities. A usual outcome of this would be a disagreeable odour.

Pipe which is set with cement through the shallow water sands to avoid polluting the water and keep the sand from caving in while drilling a well.

A swab is a tool which is lowered down a pipe on a wire line and then pulled out of the hole. As it travels up the pipe, rubber elements expand so that the fluid in the pipe is trapped above the swab and pushed to the surface. This  is necessary when the formation pressure is not high enough to blow the fluids in the pipe to the surface.

This describes natural gas that is free of significant amounts of hydrogen sulfide when produced.

Synthetic gas or SNG is a gas which is obtained by heating coal or refining heavy hydrocarbons.