Underground drilling and fracturing-integrated staged fracturing device and gas drainage process

A technology of staged fracturing and weight-on-bit, which is applied in gas discharge, earth-moving drilling, safety devices, etc., can solve the problems of affecting the permeability coefficient of coal seams, reducing the efficiency of single-hole fracturing, and increasing the cost of single-hole fracturing. Achieve the effect of improving single-hole drainage capacity, enhancing coal seam permeability, and eliminating gas disasters

Inactive Publication Date: 2011-05-25
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, downhole drilling hydraulic fracturing, an effective coal seam anti-permeability technology, has been applied on a large scale. However, the current downhole drilling hydraulic fracturing only fracturing a single borehole, and high-pressure water can easily The weak section in the borehole opens and extends cracks, and the cracking of the entire hole section is not well achieved, thereby reducing the fracturing efficiency of a single hole, increasing the cost of single-hole fracturing, and failing to generate a single hole More cracks and extensions have affected the further improvement of the coal seam permeability coefficient; in

Method used

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  • Underground drilling and fracturing-integrated staged fracturing device and gas drainage process
  • Underground drilling and fracturing-integrated staged fracturing device and gas drainage process
  • Underground drilling and fracturing-integrated staged fracturing device and gas drainage process

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Depend on Figure 1-Figure 7 Shown is an integrated staged fracturing device for downhole drilling and pressure drilling, which includes a drill bit 1, a first packer 3, a first segmented drill pipe 4, an interception and water diversion rod 5, The second packer 6, the second segmented drill pipe 7, and the function conversion rod 9 are connected with an orifice anchor 8 between the second segmented drill rod 7 and the function conversion rod 9, and the function conversion rod 9 is Hollow tubular, the function conversion rod 9 is connected to the high-pressure water pump 12 through the pipeline 11, the high-pressure water pump 12 is connected to the water tank for water injection (not shown in the water tank figure), and the pipeline 11 connected to the high-pressure water pump 12 is connected to one side of the outer wall of the function conversion rod 9 A second ball valve 10 is provided on the pipeline 11 at the rear side of the connection between the pipeline 11 and...

Embodiment 2

[0034] Depend on Figure 8-Figure 10 The downhole drilling and pressure-drilling integrated staged fracturing gas drainage process shown is implemented on the basis of Example 1, and the steps are as follows: first select the fracturing site; then determine the drilling parameters to construct the drilling, drilling Parameters include hole length, hole height, hole diameter, inclination angle, and azimuth angle; then design hydraulic fracturing, including the number of fracturing stages, the length of each fracturing stage, fracturing time, the amount of water injected into each stage of fracturing, and the injection pressure; After the downhole drilling pressure integrated staged fracturing device described in Example 1 is assembled, the drilling rig 13 is opened to drill into the coal seam drilling, and then the drilling is stopped, and a ball 24 is put into the second ball valve 10 to close the second ball valve 13. A ball valve 14, open the second ball valve 10, open the h...

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Abstract

The invention discloses an underground drilling and fracturing-integrated staged fracturing device. The device comprises a drill, a first packer, a first staged drill stem, an interception water distribution rod, a second packer, a second staged drill stem and a function conversion rod which are communicated from front to back sequentially, a first ball, a second ball, and a third ball; an underground drilling and fracturing-integrated staged fracturing gas drainage process is implemented on the basis of the technology of the underground drilling and fracturing-integrated staged fracturing device. Through the underground drilling and fracturing-integrated staged fracturing device and the underground drilling and fracturing-integrated staged fracturing gas drainage process, the integrationof drilling and fracturing is realized, the drill hole wall in a wider range can be opened and is extended and cracked, and fracturing can be can be performed more pertinently; and compared with a non- staged fracturing method, the process has the advantage that the air permeability coefficient of a coal bed is improved greatly.

Description

technical field [0001] The invention relates to a subsection fracturing device integrated with drilling pressure for downhole drilling and a process for gas drainage using the device. Background technique [0002] my country's coal mine gas disaster is serious, seriously restricting the safe production of coal enterprises. Gas drainage is the main technical means for gas control in my country at present, but due to the generally low air permeability coefficient of coal seams in my country, ideal drainage effects have not been achieved. At present, downhole drilling hydraulic fracturing, an effective coal seam anti-permeability technology, has been applied on a large scale. However, the current downhole drilling hydraulic fracturing only fracturing a single borehole, and high-pressure water can easily The weak section in the borehole opens and extends cracks, and the cracking of the entire hole section is not well achieved, thereby reducing the fracturing efficiency of a sin...

Claims

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Application Information

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IPC IPC(8): E21B43/26E21B43/17E21B7/00E21B17/00E21B17/042E21F7/00
Inventor 刘晓苏现波倪小明张丽梅宋金星郭红玉蔺海晓
Owner HENAN POLYTECHNIC UNIV
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