Well completion process method for increasing gas production of ground horizontally butted well of soft coal stratum

Abstract

The invention relates to a well completion process method for increasing gas production of a ground horizontally butted well of a soft coal stratum. The method comprises the following steps of: constructing a group of U-shaped horizontally butted well, wherein the horizontal parts are required to extend in soft coal, and the safety in a well is guaranteed by using a proper well drilling technology; then, gradually descending a special drilling tool and drilling bit into an expanding section of a vertical well along a horizontal well; and injecting sand grains of a certain specification along the drilling tool while pulling-out. Thus, the method has the following advantages of easiness in operation and promotion, capability of expanding a ground horizontally butted well drilling technology to a soft and loose coal stratum, and capability of greatly increasing the efficiency of coal bed gas drainage of a directionally butted well of the soft and loose coal stratum while expanding the application range of the ground horizontally butted well drilling technology.

Description

technical field [0001] The invention relates to a well completion process, in particular to a well completion process for improving the gas production rate of a horizontal butt joint well on the surface of a soft coal stratum. Background technique [0002] With the rapid development of the economy, my country's demand for coal-based energy is increasing day by day. At the same time, from the perspective of advocating environmental protection, energy saving and coal mine safety, the exploration, development and utilization of coalbed methane is becoming increasingly urgent. Among them, the ground horizontal docking well technology is used for coalbed methane drainage, which has high extraction efficiency and relatively low input and output. It has been fully applied in foreign countries and regions such as the United States, Australia, Europe, and South Africa. my country's Qinshui Basin has also achieved relatively good results. On the basis of good application effects, it h...

AI Technical Summary

Problems solved by technology

[0004] The present invention mainly solves the problems existing in the prior art that the hole is easy to collapse during the drilling process of the horizontal butt joint well in the soft coal seam, resulting in difficulty in forming the hole, or the hole collapses after the drilling is completed, resulting in low extraction efficiency and extraction volume, etc. Problem: Provide a kind of simple operation, easy to popularize, can expand the drilling technology of ground horizontal butt joint well to soft coal seam, expand its application scope, at the same time, a kind of efficiency of coalbed methane extraction of directional butt joint well of very soft coal seam improves soft Well Completion Technology for Gas Production Rate of Ground Horizontal Butt Wells in Coal Strata

Images