Lease is held by production and rental payments cease.

Gas producing formation similar to the Barnett Shale.

Guarantee of a price to protect against market volatility

The wellbore. Mouse holes and rat holes are shallow bores under the derrick in which the kelly joint and joints of pipe are temporarily suspended while making a connection.

An underground geological formation which is the portion of the larger formation which has sufficient porosity and permeability to constitute a reservoir.

An assignment of an interest in the minerals above or below or between specified depths, or in a given stratum or horizon.

Deviation drilling that ultimately is horizontal or near horizontal to increase the length of the well bore penetrating the target formation.

Poured down a well to stimulate production - a form of tertiary recovery.

An organic compound of hydrogen and carbon.

A chemical reaction in which hydrogen is added to a material.

The pressure exerted in a well by the drilling fluid in opposition to the formation pressure to keep the gas from blowing out the hole.

A process unit used to treat transportation fuels. More specifically, the unit is designed to reduce the sulfur and nitrogen contents of the feedstock and improve combustion.