Method for removing blockage, increasing permeability and well-completing of horizontal well of coalbed methane

Abstract

The invention relates to a method for removing blockage, increasing permeability and well-completing of a horizontal well of coalbed methane, and aims to solve the problems that when a mud drilling method is used, a hole wall is blocked by mud, the coalbed methane in a coal bed cannot penetrate through the mud, and low mining efficiency is caused. The method of removing the blockage, increasing the permeability and well-completing of the horizontal well of the coalbed methane comprises the following steps that drilling is conducted, and after well completion, a screen pipe is put down; a horizontal section of the horizontal well of the coalbed methane is divided into a plurality of coal bed sections for removing the blockage and increasing the permeability; the operation scheme of controllable shock wave equipment is determined; the controllable shock wave equipment is sent to a coal bed section to be transformed, and water is injected into a coal bed gas well; implement of operation of removing the blockage and increasing the permeability to an operation point is conducted through the controllable shock wave equipment; operation times of the controllable shock wave equipment is monitored by a monitoring probe; after the operation of removing the blockage and increasing the permeability in the coal bed section is finished, shock wave operation of the next coal bed section to betransformed is conducted in a method of layer and layer returning; and after operation of removing the blockage and increasing the permeability of all of the coal bed sections is finished, the controllable shock wave equipment is pulled out.

Description

technical field [0001] The invention belongs to the field of energy exploitation, and in particular relates to a method for removing plugging and enhancing permeability of a coalbed gas horizontal well. Background technique [0002] The coalbed methane (gas) disaster caused by coal is the most serious and frequent major vicious accident in my country's coal mines, which seriously threatens the safe production of mines. Coalbed methane is also a source of atmospheric environmental pollution such as greenhouse effect and destruction of the ozone layer. Its greenhouse effect is 20 to 24 times that of an equivalent volume of carbon dioxide, and its ability to destroy the atmospheric ozone layer is 7 times that of carbon dioxide. [0003] It has been three years since the "13th Five-Year Plan" was released. Although the coalbed methane industry continues to struggle, due to various factors, its actual development is far below expectations. However, the potential of coalbed methan...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a coalbed methane horizontal well deblocking and anti-permeability completion method to solve the problem that when mud drilling is used, the mud will block the hole wall, so that the coalbed methane in the coal seam cannot pass through the mud, resulting in low mining efficiency The problem

Images