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Turning radial well device and method for extracting coal bed gas of segmented guide horizontal fracturing well

A technology for radial wells and horizontal wells, applied in directional drilling, wellbore/well components, drilling equipment and methods, etc., can solve the problems of low coalbed methane extraction efficiency, improve the expansion area and fracturing effect, The effect of widening the restriction of selection and improving the drilling quality

Active Publication Date: 2021-10-22
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the defects and insufficiencies in the prior art, the present invention provides a turning radial well device and a method for extracting coalbed methane from horizontal fracturing wells with segmental guidance, so as to solve the problem of coalbed methane extraction efficiency in broken, soft and low-permeability coal seams in the prior art low technical issues

Method used

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  • Turning radial well device and method for extracting coal bed gas of segmented guide horizontal fracturing well
  • Turning radial well device and method for extracting coal bed gas of segmented guide horizontal fracturing well
  • Turning radial well device and method for extracting coal bed gas of segmented guide horizontal fracturing well

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Embodiment 1

[0045] Follow the above technical scheme, such as Figure 2 to Figure 4 As shown, the present invention provides a turning radial well device, including an interactive spur bridge plug mechanism 1, a plug-in inverted tooth injector mechanism 2 and a plug-in inverted tooth turning radial well mechanism 3;

[0046] The interactive spur bridge plug mechanism 1 is connected with the plug-in inverted tooth injector mechanism 2, and is used for the directional injection construction operation of the horizontal section of the horizontal well to communicate with the rock formation;

[0047] The interactive spur bridge plug mechanism 1 is connected with the plug-in inverted tooth turning radial well mechanism 3, and is used for the directional radial well construction operation of communicating coal seams in the horizontal section of the horizontal well;

[0048] The overall structure of the interactive spur bridge mechanism is as follows: figure 2 As shown, it includes a combined ru...

Embodiment 2

[0063] Such as figure 1 As shown, the target mining coal seam in this embodiment is a high-gas outburst coal seam in a certain coal mine in Shanxi, the firmness coefficient f of the coal seam is 0.4, the roof of the coal seam is interbedded with sand and mudstone, which is broken and has poor drillability, and the gas content of the coal seam is 16~18m 3 / t, has been identified as a high gas outburst mine, which seriously threatens the safety and production of coal seams, so it is necessary to carry out the pre-extraction work of ground coal bed methane.

[0064] This embodiment discloses a method for extracting coalbed methane from horizontal fracturing wells guided by stages. The method is realized by the turning radial well device disclosed in Embodiment 1, and includes the following steps:

[0065] Step 1. Determine the layout position of the horizontal section of the horizontal well in the overlying stable rock formation or easy-drilling rock formation on the top surface...

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Abstract

The invention discloses a turning radial well device. The turning radial well device comprises an interactive type positive tooth bridge plug mechanism, an inserted type inverted tooth ejector mechanism and an inserted type inverted tooth turning radial well mechanism. The interactive type positive tooth bridge plug mechanism is connected with the inserted type inverted tooth ejector mechanism and used for conducting directional jet construction operation of a communication rock stratum on a horizontal section of a horizontal well. The interactive type positive tooth bridge plug mechanism is connected with the inserted type inverted tooth turning radial well mechanism and used for conducting directional radial well construction operation of a communication coal bed on the horizontal section of the horizontal well. The invention further discloses a method for extracting coal bed gas of a segmented guide horizontal fracturing well. The horizontal well is arranged in a stable rock stratum covering the top boundary of a broken and soft coal bed or an easily-drilled rock stratum, and then directional perforation, directional radial well construction, segmented fracturing, well dredging and washing, open flow reverse drainage and drainage gas recovery operation are conducted. According to the method, a drilling layer is arranged in the stable rock stratum covering the coal bed, and the drilling quality of the horizontal well is improved through special equipment.

Description

technical field [0001] The invention belongs to the technical field of surface coalbed methane development, and relates to a device and method for extracting coalbed methane, in particular to a turning radial well device and a method for extracting coalbed methane from segmentally guided horizontal fracturing wells. Background technique [0002] At present, ground vertical wells and horizontal wells are mainly used for extraction of coalbed methane from broken soft low permeability coal seams. Surface vertical wells have the disadvantages of low gas production per well, high operating costs, low gas production efficiency, and large land occupation; horizontal wells are drilled in coal seams with good coal structure, and most horizontal wells are completed with open holes. There are only a few horizontal downhole casings and no cementing, so the fracturing scale is limited, which ultimately leads to poor reservoir stimulation effects; a large amount of coal powder is produced...

Claims

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Application Information

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IPC IPC(8): E21B43/00E21B43/114E21B43/26E21B43/267E21B33/134E21B7/04
CPCE21B43/006E21B43/114E21B43/26E21B43/267E21B33/134E21B7/046
Inventor 刘磊姜在炳张群程斌舒建生范耀李渊庞涛
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP