Devices & techniquies for coal-bed methane well test
Zhang Shi-fu,LI Zhijun (No. 1 Exploration Bureau of China National Adminis.of Coal Geology, Handan 056004, China)
The devices for coal-bed methane well test are as follows:an injection pump system, a shut-off system,an underground tool string, a packer and pressure giving system, an oil tubing, a high accuracy electronics pressure gauge, a computor and an interpretation software. Injection/fall off well test is a kind of single well pressure transient measurement, which can provide parameters like follows: permeability, reservoir's pressure, skin factor, well-bore storage factor, reservoir's pressure gradient, in-situ stress gradient, breakout and close pressure of coal seam, reservoir's temp., radius of investigation,and so on.
【CateGory Index】： TD712