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Horizontally butted well hydraulic scour migration pressure relief outburst elimination gas extraction method

A technology for docking wells and horizontal wells, applied in the field of gas outburst elimination and coalbed methane extraction, can solve problems such as failure to achieve expected results, and achieve the effects of shortening construction period, increasing extraction efficiency, and increasing permeability

Active Publication Date: 2015-09-16
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This "three low" reservoir conditions make the conventional surface vertical well mining technology gradually show its shortcomings in the development of coalbed methane in my country, and cannot achieve the expected results

Method used

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  • Horizontally butted well hydraulic scour migration pressure relief outburst elimination gas extraction method
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  • Horizontally butted well hydraulic scour migration pressure relief outburst elimination gas extraction method

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with an embodiment (accompanying drawing):

[0023] Such as figure 1 , figure 2 , image 3 , Figure 4 As shown, the specific implementation steps of the horizontal docking well hydraulic scouring migration, pressure relief and outburst gas recovery method of the present invention are as follows:

[0024] (1) Drill a vertical well 8 at the predetermined position. The well is drilled from the ground 1 to the bottom of the target coal seam 2. The well is completed with casing above the roof of the coal seam and completed with open hole below the roof of the coal seam.

[0025] (2) The horizontal well 3 is connected with the vertical well 8, and the vertical well 8 and the deflection section 4 are casing-fixed, and the screen 15 is lowered in the horizontal section 5 to ensure the unimpeded connection and prevent blockage. The screen hole 14 should be large to reduce fluid resistance.

[0026] (3) L...

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Abstract

The invention discloses a horizontally butted well hydraulic scour migration pressure relief outburst elimination gas extraction method. Firstly, a plumb shaft (8) is drilled, the cased hole completion is performed above a coal seam roof, and the barefoot completion is performed below the coal seam roof; an inclined section (4) of a horizontally butted well (3) is drilled, and the casing cementing is performed; then, a horizontal section (5) channel is drilled by a conventional method, and is in butt joint with the plumb shaft (8), and the barefoot completion is performed; a screen pipe (15) and a continuous play pipe (13) are put down onto the horizontal section (5), the screen pipe (15) has a screen hole (14), and a piston seal (12) is additionally mounted at the top end of the continuous play pipe (13); high-flow high-head clear water is continuously injected into the plumb shaft (8) to scour coal powder through the screen hole (14) to form coal powder slurry, and a plug head is moved to repeatedly operate; the coal powder slurry is discharged to the ground through a horizontal well mouth annulus part (3); and a gas, coal and water separation device (7) is used for separating, coal and gas are collected and stored, and water is circulated for downhole jetting and scouring. The horizontally butted well hydraulic scour migration pressure relief outburst elimination gas extraction method provides a new solution for low-permeation soft coal seam ground pressure relief outburst elimination gas extraction.

Description

technical field [0001] The invention relates to the fields of gas outburst reduction and coal bed gas extraction of soft, low permeability and high outburst coal reservoirs, and is especially suitable for coal seams with good coal powder water solubility and easy flow under pressure. Background technique [0002] Drilling technologies for surface mining of coalbed methane are mainly vertical wells and horizontal wells. Due to various reasons, my country's coalbed methane reservoirs generally show the characteristics of "three lows" of low pressure, low permeability and low gas saturation. This "three low" reservoir conditions make the conventional surface vertical well mining technology gradually insufficient in the development of coalbed methane in my country, and cannot achieve the expected results. The practice of coalbed methane development has proved that horizontal wells can effectively connect the fracture system of coal reservoirs, increase the gas and water conduct...

Claims

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Application Information

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IPC IPC(8): E21B43/00
Inventor 冯立杰翟雪琪王金凤潘云波岳俊举卢明张博王延锋王亚州安云飞刘振峰张世斌王宇彬
Owner ZHENGZHOU UNIV
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