What is coal seam gas and how is it extracted?

How is coal seam gas used to produce energy?

On the surface, the gas is separated from the water. The produced water is safely disposed of, or treated and recycled for industrial purposes or irrigation. The gas is sent to a compressor station and may then be used in power stations, or it may join the natural gas supply for use by households and businesses.

Why coal seam gas is bad?

Coal seam gas extraction can affect water in a number of ways: it could contaminate underground water if there’s a leak that enters a water source; affected water could travel between underground water sources; loss of pressure could cause fluid to move between connected underground sources; or it could contaminate the …

Is coal seam gas fracking?

In some cases hydraulic fracturing, or ‘fracking’, is used to extract coal seam gas. Hydraulic fracturing is the process of injecting fluid under high pressure into a coal seam to widen existing fractures and create new ones.

Is coal seam gas good or bad?

Some chemicals used in drilling and hydraulic fracturing, and naturally occurring contaminants released from the coal seam during mining, could harm human health, given sufficient dose and duration of exposure. This potential harm includes increased risk of cancer.

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How do you extract gas from coal?

The process involves pumping oxygen and steam through a small borehole into the coal seam to produce a small and controlled combustion. Unlike coal-bed methane, therefore, the actual coal is converted from a solid state into gas.

What are the two types of coal seam gas?

CSG is almost pure methane; conventional gas is around 90 per cent methane with ethane, propane, butane and other hydrocarbons making up the remainder. The difference between CSG/shale gas and conventional gas is the type of geological rock they are found in.

How does a CSG well work?

A CSG well is created by drilling through layers of earth and rock as deeply as 1000 metres below the surface. Multiple layers of steel casing and cement are pressure injected so the well adheres to the surrounding rock. A strong seal prevents gas or fluid leakage into permeable layers, including aquifers.