Coal Seam Gas
Coal seams contain both gas and water. The amount of water will vary from location to location.
Once the water and gas are bought to the surface, it is separated at the well head.
Water that is extracted from coal seam gas (referred to as ‘produced water’) is generally very salty, and not suitable for reuse until it is treated. This water is generally stored in a tank at the wellhead for later transportation to either a holding pond for treatment and reuse, or directly to a reverse osmosis water treatment plant, where it undergoes rigorous treatment to remove any solids.
In some cases, the produced water can be used in water intensive industries such as cement and brick manufacturing.
Gas is sent to a processor plant where any remaining water is removed. The end product is then compressed, an odorant is added, and the gas is sent to the distribution network.
Shale and Tight Gas
Shale and tight sandstone don’t produce the same amount of water in the production process, but some separation still needs to take place in the same way as processing coal seam gas.
Once the gas has been processed, it is compressed, and odorant is added, and the gas is sent to the distribution network.