Multiple coal bed independent gas-containing system pressure control single pump type drainage gas mining device and drainage gas mining method

摘要

The present invention relates to a multi-coal bed independent gas-containing system pressure control single pump type drainage gas mining apparatus and a drainage gas mining method, comprising an inner sleeve and an outer sleeve, an oil pipe is installed inside the inner sleeve, and an oil pipe inside a sucker rod is installed, and a conduit pump is connected to a lower end of the sucker rod, a sand precipitation pipe is installed at the bottom of the conduit pump, and a sieve pipe is further installed above the sand precipitation pipe; a packer 1 and a packer 2 are installed between the inner sleeve and the outer sleeve; A pressure gauge cable and annular flow limiting valve cable are further fixedly installed on the inner pipe wall of the inner sleeve, and a pressure gauge is connected to the lower end of the pressure gauge cable, the pressure gauge is fixedly installed on the lower end of the inner sleeve inner wall, and the annular flow limiting valve cable It is characterized in that an annular flow limiting valve is connected for each independent gas-containing system at the lower stage. The present invention controls the amount of water flowing into the inner sleeve pump inlet by installing an annular flow limiting valve; The same level auxiliary pipe isolates the gas produced by each stand-alone gas-containing system, and a gas flow meter is installed on top of the equal level auxiliary pipe to monitor the gas output of each gas-containing system.