Device and method for leaking stoppage of open hole in coal-series gas exploration well

Abstract

The invention relates to a device for leaking stoppage of an open hole in a coal-series gas exploration well, which comprises a grouting pump, a water injection pump, hollow drill rods and a packer, wherein the wellhead of the coal-series gas exploration well is provided with a surface sleeve, multiple sections of hollow drill rods extend into the coal-series gas exploration well from the wellheadof the coal-series gas exploration well, the packer is arranged outside the lower end of one section hollow drill rod, the grouting pump is connected with the upper end of the uppermost section hollow drill rod through a grouting pipe, the water injection pump is connected with an air inlet of the inner wall of the packer through a water injection pipe, the water injection pipe is arranged alongthe inner wall of the hollow drill rods, and the water injection pipe penetrates out of the grouting pipe at the wellhead of the coal-series gas exploration well and is connected with the grouting pipe in a sealing way. The invention also discloses a leaking stoppage method of the device. The method effectively solves the limitation of leakage stoppage methods using inert materials, conventional cement, casing sealing and the like, provides a new leakage stoppage device and method for a coal-series gas exploration well, optimizes a pumping procedure method and achieves the purpose of leakage stoppage, and has important practical significance for exploration and development of coal-series gas resources.

Description

technical field [0001] The invention belongs to the technical field of coal-measure gas exploration, and in particular relates to an open-hole plugging device and method for coal-measure gas exploration wells. Background technique [0002] How to deal with drilling loss in complex formation drilling is the most common problem. Due to the leakage of the borehole, the drilling construction is difficult, the borehole is seriously leaked, and the water gushing causes the borehole to collapse, the drill tool is stuck, and the drilling is forced to stop for treatment. Improper handling of drilling leakage will cause other accidents in the hole, affect the quality of drilling and construction efficiency, and even scrap the drilling. Traditional treatment methods mainly include inert material plugging, gel or cement plugging, casing running for plugging, etc. In the specific implementation process, the plugging effect of inert materials is limited; plugging materials such as cemen...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the disadvantages of conventional coal-measure gas exploration wells in the prior art that the length of the cement plug is difficult to control, the time for plug sweeping is increased, repeated leakage occurs, and the casing isolation process is complicated and the cost is high, the present invention provides a Open-hole plugging device and method for various coal-measure gas exploration wells

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