Coiled-tubing fracturing effectively stimulates multiple coal seams

Coiled-tubing fracturing provides a way to stimulate multiple coal seams economically and effectively in the Black Warrior basin in Alabama, according to Joseph Legenza of Halliburton Energy Services, Tuscaloosa, Ala., in an account of the technology provided to Oil & Gas Journal.He explained that the challenges for commercializing coalbed methane (CBM) wells in Alabama are to keep costs low and to stimulate effectively all the potential productive coal seams in a given wellbore.Alabama coalbedsCommercial coalbed methane production in Alabama started in the early 1980s. The 113 bcf/year of coalbed methane produced in the state represents about 28% of Alabama's total natural gas produc...

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