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Water produced with coal-bed methane

January 1, 2000

Natural gas produced from coal beds (coal-bed methane, CBM) accounts for about 7.5 percent of the total natural gas production in the United States. Along with this gas, water is also brought to the surface. The amount of water produced from most CBM wells is relatively high compared to conventional natural gas wells because coal beds contain many fractures and pores that can contain and transmit large volumes of water. In some areas, coal beds may function as regional or local aquifers and important sources for ground water. The water in coal beds contributes to pressure in the reservoir that keeps methane gas adsorbed to the surface of the coal. This water must be removed by pumping in order to lower the pressure in the reservoir and stimulate desorption of methane from the coal (fi g. 1). Over time, volumes of pumped water typically decrease and the production of gas increases as coal beds near the well bore are dewatered.

Publication Year 2000
Title Water produced with coal-bed methane
DOI 10.3133/fs15600
Publication Type Report
Publication Subtype USGS Numbered Series
Series Title Fact Sheet
Series Number 156-00
Index ID fs15600
Record Source USGS Publications Warehouse