Exploiting device and method for horizontal well of coalbed methane

Abstract

The invention relates to the field of exploiting of coalbed methane, in particular to an exploiting device and method for a horizontal well of coalbed methane. The device comprises a sifting pipe, a casing pipe and a connecting assembly; the sifting pipe is put into the position of the horizontal well of a coalbed; the casing pipe is connected with the sifting pipe, and put into the position of aplumb shaft section; the connecting assembly is connected with the sifting pipe and the casing pipe, and comprises a packing device and salvageable interior accessories, the packing device is connected with a shell, and the shell is connected with the casing pipe through a connecting device; the packing device is used for abutting against the well wall after expanding. According to the device andmethod, during well completion, the sifting pipe is put into the horizontal well of the coalbed, the coalbed methane is collected through the sifting pipe, and the casing pipe is put into the interference stratum above the coalbed; meanwhile, the casing pipe and the annulus band of the well wall are sealed in a well cementation mode, so that the situation that development of the coalbed methane isinterfered by the interference stratum; meanwhile, normal well completion of the plumb shaft section can be achieved, lossless work of the coalbed of the horizontal section can also be guaranteed, and the requirement for efficient development of the coalbed methane is completely met.

Description

technical field [0001] The invention relates to the field of coal bed gas mining, in particular to a mining device and method for a coal bed gas horizontal well. Background technique [0002] Coalbed methane refers to the hydrocarbon gas that is adsorbed on the surface of coal matrix particles in the coal seam, or partly dissociated in the coal pores or dissolved in the coal seam water. It is a clean, high-quality energy and chemical raw material that has risen internationally in the past ten or twenty years. The development and utilization of coalbed methane can produce huge economic benefits, and has become an important national strategic resource. [0003] The development of coalbed methane generally adopts the method of drilling and collecting, and cementing is required after drilling. The existing cementing technology is to run the casing in the drilled open hole, and inject the prepared cement slurry into the wellbore and the casing. After the cement slurry has solid...

AI Technical Summary

Problems solved by technology

The completion technology of utilizing horizontal wells to develop coalbed methane is still in the exploratory stage. For coalbeds containing coalbed methane, the geological characteristics are cracked or porous, and cement slurry will pollute the coalbed, which will affect the exploitation of coalbed methane. It is not suitable Well cementing, while other interfering layers above the coal seam need to be sealed and separated to avoid affecting the development of coalbed methane and coal seam

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