煤层气试井设备和试井技术

Devices & techniquies for coal-bed methane well test

煤层气注入 /压降试井设备包括注入泵系统、关井系统、井下工具串、封隔器加压系统、油管、高精度电子压力计、计算机及分析处理软件等。注入 /压降法试井是一种单井压力瞬变测试 ,试井通常提供的参数是渗透率、储层压力、表皮系统、井筒储集系数、储层压力梯度、地应力梯度、煤层的破裂压力和闭合压力、储层温度、调查半径等。

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.