Shale gas

Shale gas

Shale gas is natural gas produced from shale which has become an increasingly important source of energy due to recent development with drilling technology that makes the extraction of shale gas economically viable.

Industry: Energy

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Shale gas

Source water

Energy; Shale gas

Operators may withdraw water from surface or ground water sources themselves or may purchase it from suppliers.

High volume fracking

Energy; Shale gas

A technique developed in the 1990s that uses a different blend of chemicals than earlier forms of fracking with less gelling agents and more friction‐reducing chemicals called hydraulic fracturing ...

Anulus

Energy; Shale gas

The empty space or gap between the rock face and the steel pipe in a borehole is called anulus. It's about an inch wide and is usually filled with cement to prevent methane from escaping.

Biocide

Energy; Shale gas

Any substance the kills or retards the growth of microorganisms.

Biocides

Energy; Shale gas

Chemicals used to kill bacteria. They are necessary to prevent bacteria, which are present naturally in the fresh water used for fracking, from forming colonies on the rock face and causing serious ...

Acidizing

Energy; Shale gas

A process performed either before or during fracking. It involves pumping acid—usually hydrochloric acid—into the rock formation so that the fractures in the well can be opened more effectively.

Aquitard

Energy; Shale gas

A geological formation that may contain ground water but is not capable of transmitting significant quantities of it under normal hydraulic gradients.