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A coalbed methane well upper and lower three-dimensional combined extraction method

A coalbed methane well and three-dimensional technology, applied in mining equipment, earthwork drilling, gas discharge, etc., can solve the problems of limited effective pressure relief area, difficulty in achieving multi-purpose wells, and difficult maintenance of wellbore stability, so as to improve underground drainage efficiency effect

Active Publication Date: 2016-10-12
CHINA UNIV OF MINING & TECH
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Problems solved by technology

Due to the limited effective pressure relief area of ​​vertical wells and the bottom of the wellbore being close to the caving zone, it is not easy to maintain the stability of the wellbore after coal mining, and ultimately it is difficult to achieve the goal of "one well for multiple purposes".

Method used

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  • A coalbed methane well upper and lower three-dimensional combined extraction method
  • A coalbed methane well upper and lower three-dimensional combined extraction method
  • A coalbed methane well upper and lower three-dimensional combined extraction method

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Embodiment Construction

[0027] In the figure, the coalbed methane well upper and lower three-dimensional joint extraction method includes vertical well 1, horizontal well and vertical well joint 2, horizontal well section 3, caving zone 4, curved subsidence zone 5, and horizontal well 6 , fissure zone 7, air return lane 8, air inlet lane 9, partition 11, coal seam 12, sealing device 14, underground extraction borehole 15, goaf 16, vertical well 1 constructed on the ground and mining along the coal seam The horizontal well 6 in the horizontal direction, the bottom of the vertical well 1 shaft and the horizontal section 3 of the horizontal well are all located in the transition zone between the fracture zone 7 and the curved subsidence zone 5. The diameter of the bottom of well 1 is expanded to reduce the difficulty of connecting horizontal well 6 and vertical well 1. The diameters of the extraction pipes of vertical well 1 and horizontal well 6 are both larger than 200 mm. The length of the roof is di...

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Abstract

A coalbed methane well upper and lower three-dimensional combined drainage method, in the transition area between the fractured zone and the curved subsidence zone, a horizontal well and a vertical well are connected, and the horizontal section of the horizontal well is properly close to the side of the return airway of the recovery working face; the diameter of 200 Large-diameter drainage pipes of more than mm, using staged hydraulic fracturing, staged sealing, and gradient negative pressure extraction techniques, select different extraction wells for coalbed methane extraction at different stages of coal mining. After coal recovery, this method can realize synchronous drainage in different areas in time, and three-dimensional drainage in different areas in space, which improves the extraction efficiency of coalbed methane, and at the same time can extract the surrounding rock gas on the roof of the coal seam. Combined extraction of different types of gases and "one well for multiple purposes" are realized.

Description

technical field [0001] The invention relates to a coal bed gas extraction method, in particular to a coal bed gas well upper and lower three-dimensional joint extraction method. Background technique [0002] Coalbed methane is a clean energy source, and its development and utilization is conducive to the adjustment of my country's energy structure. Since my country's coal reservoirs have the characteristics of "three lows and one high" (low saturation, low permeability, low reservoir pressure, and high degree of metamorphism) (Yuan Liang, 2013), to improve the efficiency of CBM development, it is imperative to overcome the above Conundrums arising from the characteristics of coal reservoirs. For the low permeability of my country's coal reservoirs, hydraulic fracturing is mostly used for surface mining; underground drainage adopts the method of pressure relief, mining protective layers above the coal seam or special drainage tunnels to extract coal seam gas. At present, ver...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21F7/00
Inventor 吴财芳刘小磊李腾周琦忠张晓阳霍战波刘强王宇航
Owner CHINA UNIV OF MINING & TECH
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