| 摘要 |
<p>An exploitation system and method for displacing coal bed gas by mixed gas through a pumping drainage way which is under a well is disclosed. The exploitation system includes coal bed (5), a machine way (2), an air way (3), a pumping drainage way (4), and pumping drainage holes (6). The machine way (2) and the air way (3) are around a plane of the coal bed (5). The pumping drainage way (4) is at upper or lower side of the coal bed (5). Some pumping drainage holes (6) are located in the coal bed (5). Some injection holes (1) are sited in the pumping drainage way (4) which is connected with the coal bed (5). The exploitation method includes the following steps: ? enabling two or more gas to form a mixed gas which at least includes one or more of nitrogen, hydrogen, and helium; ? using high-pressure injection equipment to inject the mixed gas into the coal bed (5) via the injection holes (1); ? using pumping equipment to get gas containing coal bed gas from the pumping drainage hole (6). It's indicated for an exploitation field of low permeation and exploitable coal bed gas.</p> |
