双煤层煤层气井四通道分层控压排采技术及试验

Drainage technology and test of stratified pressure control with four-channels of CBM well in double coal seams

针对双煤层煤层气井生产过程中层间相互干扰、储层伤害严重的问题,提出了双煤层四通道分层控压排采技术,排采过程中将两层煤控制在不同的压力系统中以达到分层生产的目的,研制出了一套双煤层四通道分层控压排采装置,包括四通道封隔器、监测设备、多通道油管扶正器、滚轮式抽油杆扶正器和辅助联通管。现场应用试验表明:四通道封隔器能够根据需要起到封隔效果,使两个产层处于两个不同的压力系统中,双煤层四通道分层控压排采技术具有现实可行性。

Aiming at the problems of mutual interference between layers and serious damage in reservoirs in the production process of double-coal CBM wells,a four-channel stratified pressure control drainage technology was proposed,in the process of drainage,two coal seams were controlled in different pressure systems to achieve the purpose of stratified production and CBM well drainage device with four-channel packer,monitoring equipment,multi-channel tubing centralizer,roller sucker rod centralizer and auxiliary communication tube for double coal seams was developed.Field application test shows that the four-channel packer can achieve the isolation effect according to the needs,so that the two production layers are in two different pressure systems,and the four-channel layered pressure-controlled drainage technology has practical feasibility.