关键词: 沁水盆地, 枣园井网, 煤层气, 采收率, 采出程度, 压降

Abstract: The recovery ratio, exploitation degree, drainage range and the production forecast of single coal-bed methane (CBM) well were discussed by using the production data of Zaoyuan well pattern. By the end of November 2003, the total accumulative production of CBM in Zaoyuan well pattern was 9.7979 million cubic meters. The recovered percentage was 2.2 percent. It is estimated that about 236 million cubic meters of recoverable CBM reserves has not been extracted from the coal beds of this well pattern. At present, Zaoyuan well pattern stands in initial stage of production. The range of single well drainage is less than 10 acres, and these wells have not been connected with pressure produced itself. It is predicted that the average gas rate of single well would be from 2500 cubic meters to 3000 cubic meters per day, after a larger range of pressure drop funnel was formed. So, the well space was suggested to be 20 acres to 25 acres.

Key words: Qinshui Basin, Zaoyuan well pattern, coal-bed methane, recovery ratio, recovered percentage, pressure drop