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Self-rotating jet drilling device

A drilling device and self-rotation technology, which is applied in the direction of liquid/gas jet drilling, drill bits, drilling equipment, etc., can solve the problems of low drilling efficiency and poor hole quality

Active Publication Date: 2012-10-10
山西尚道能源开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the above two jet drilling methods use the rock-breaking effect of high-pressure water jets and the quasi-static pressure to spray high-pressure liquid through nozzles or nozzles to drill holes. Therefore, the drilling efficiency is low and the quality of the aperture poor

Method used

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Embodiment Construction

[0021] In order to have a clearer understanding of the technical features, objects and effects of the present invention, the specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0022] like figure 1 , figure 2 , image 3 As shown, the present invention provides a self-rotating jet drilling device 100, the self-rotating jet drilling device 100 includes a cylindrical shell 1, the rear end of the shell 1 is provided with a tubular connecting portion 11 for connecting A high-pressure hose in the jet drilling tool string; a rotating body 2 can be rotatably set in the housing 1, and the outer diameter of the rotating body 2 is the same as the inner diameter of the housing 1 (forming a dynamic fit, which can make the rotating body 2 Rotating freely in the housing 1), the front end of the rotating body 2 is provided with a cylindrical extension 21 along its axial direction, and the extension 21 extends out of the front e...

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Abstract

The invention relates to a self-rotating jet drilling device, which comprises a cylindrical shell, wherein the back end of the shell is provided with a tubular connecting part; a rotating part is rotatably arranged in the shell; the outer diameter of the rotating part is corresponding to the inner diameter of the shell; the front end of the rotating part is provided with a cylindrical extending section along the axial direction; the extending section extends out of the front end of the shell and is fixedly connected to a sprayer along the axial direction; the periphery of the rotating part isprovided with a plurality of helical grooves; an axial through hole is arranged on the rotating part; blind holes are arranged in the sprayer from back to forth; the blind holes are communicated withthe through hole; and the surface of the front end of the sprayer is provided with a plurality of jet holes connected to the blind holes and is also fixed with a cutter. The device can increase the drilling efficiency and the aperture quality, can form a jet hole unloading strip having a certain of diameter and depth on a coal layer by the double action of the cut drilling and jetting, can efficiently increase the gas well capacity on the coal layer and can increase the gas recovery ratio of the coal layer.

Description

technical field [0001] The invention relates to a drilling device for coal bed gas exploitation, in particular to a self-rotating jet drilling device. Background technique [0002] The development of coalbed methane is carried out in the form of coalbed methane wells, and the amount of gas production is directly related to the area of ​​gas production. The existing mining method is to mine coalbed methane after drilling, and the gas production area is only the circumferential area of ​​the drilling hole. In order to increase the gas production area, it is necessary to open holes (also known as windowing) on ​​the casing of the coalbed methane well, and then use high-pressure water or sand mixing fluid (which can be silt, quartz sand, ceramsite or other types of abrasives) to pass through and continuously The nozzle connected to the oil pipe sprays the formation to form a perforation hole with a certain diameter and depth, so as to release the stress of the coal seam and imp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B7/18E21B10/42E21B10/60E21B43/114E21B43/119
Inventor 刘升贵
Owner 山西尚道能源开发有限公司
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