Method for drilling coal-bed gas well penetrating through goaf by means of composite blocking of hole-bottom broken rock masses

A technology for coalbed methane wells and goafs, which is applied in drilling equipment and methods, drilling equipment, wellbore/well components, etc., can solve problems such as drilling difficulties, hidden dangers, and drilling existence, and achieve simplified grouting equipment. Effect

Active Publication Date: 2017-11-03
SHANXI JINCHENG ANTHRACITE COAL MINING GRP CO LTD +2
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Problems solved by technology

[0004] The present invention aims at the problems of drilling difficulties and potential safety hazards when drilling coalbed methane wells through goafs, and further provides a drilling method for coalbed methane wells crossing goafs with composite plugging of broken rock mass at the bottom of the hole

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  • Method for drilling coal-bed gas well penetrating through goaf by means of composite blocking of hole-bottom broken rock masses
  • Method for drilling coal-bed gas well penetrating through goaf by means of composite blocking of hole-bottom broken rock masses
  • Method for drilling coal-bed gas well penetrating through goaf by means of composite blocking of hole-bottom broken rock masses

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Embodiment Construction

[0042] Aiming at the unfavorable geological conditions of coalbed methane well drilling with a large number of broken rock masses or cavities in the goaf, the present invention is based on the pneumatic down-the-hole hammer drilling method, combined with injection of foam liquid at the bottom of the hole, grouting at the bottom of the key broken rock mass, and casing Auxiliary technologies such as follow-up and technical casing end grouting stabilization have solved the drilling technical problems that it is difficult for coalbed methane wells to penetrate the broken rock mass or hollow section of the goaf. The key point of the technique is that the coalbed methane wells are drilled in stages with three opening diameters in sequence, and the second drilling stage passes through the goaf. Among them, in the moderately broken rock mass section (middle and upper part of the fissure zone), the auxiliary measures of injecting foam liquid at the bottom of the hole are implemented; in...

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Abstract

The invention belongs to the technical field of coal-bed gas resource exploitation and provides a method for drilling a coal-bed gas well penetrating through a goaf by means of composite blocking of hole-bottom broken rock masses. According to the method, the problems that when the coal-bed gas well is constructed through the goaf, drilling is difficult, and potential safety hazards exist during drilling are solved. The second spud-in drilling stage is conducted through the goaf, and the broken rock masses of drilling surrounding rock of the coal-bed gas well are blocked in sectioned and composite modes; the broken rock masses of the drilling surrounding rock are constructed by three stages, specifically, an auxiliary measure of injecting foam liquid into a hole bottom is carried out on a medium broken rock mass section, an auxiliary measure of injecting slurry into the hole bottom is carried out on a significant broken rock mass section, and a pipe-following drilling measure is carried out on a caving zone cavity section; and accordingly safe and efficient passing-through of the broken rock mass sections and caving zone cavities is achieved. Meanwhile, through the compressive stabilizing technology of a surface layer casing, an intermediate casing and a production casing, the overall rigidity and stability of the drilled well are greatly strengthened

Description

technical field [0001] The invention belongs to the technical field of mining of coalbed methane resources, and in particular relates to a drilling method for coalbed methane wells passing through goafs through composite plugging of broken rock mass at the bottom of holes, mainly adopting pneumatic down-the-hole hammers and auxiliary technologies to excavate and drill wells to form coalbed methane wells, and for drainage and mining. CBM in underground coal seams or gobs. Background technique [0002] To drill coalbed methane wells in goafs, it is necessary to overcome the problem of drilling broken rock masses in goafs. Usually, the drilling methods for coalbed methane wells mainly include mud circulation drilling and pneumatic down-the-hole hammer drilling. The surface casing is used in the upper part, and the technical casing wall can also be used in the broken rock mass section to prevent the hole from collapsing. The gap between the casing and the borehole wall is fille...

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Application Information

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IPC IPC(8): E21B7/00E21B7/20E21B21/14E21B33/13E21B33/14
CPCE21B7/00E21B7/208E21B21/14E21B33/13E21B33/14
Inventor 孟召平姚爱军郭向前田永东李超
Owner SHANXI JINCHENG ANTHRACITE COAL MINING GRP CO LTD
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