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Coal-bed gas well vertical three-dimensional united extraction method

A coalbed methane well and extraction technology, applied in mining equipment, earthwork drilling, gas discharge and other directions, can solve the problems of limited effective pressure relief area, difficult to maintain wellbore stability, difficult to achieve, etc. Effect

Active Publication Date: 2014-11-05
CHINA UNIV OF MINING & TECH
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Problems solved by technology

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

Method used

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  • Coal-bed gas well vertical three-dimensional united extraction method
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  • Coal-bed gas well vertical three-dimensional united 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 and the horizontal section 2 of the horizontal well are all located in the transition zone between the fracture zone 7 and the curved subsidence zone 5. The height of this zone from the coal seam roof is generally 5 to 8 times the thickness of the coal seam. The diameter of the bottom of vertical well 1 is expanded to reduce the difficulty of connecting horizontal well 6 and vertical well 1. The extraction pipes of vert...

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Abstract

A coal-bed gas well vertical three-dimensional united extraction method comprises the steps that a horizontal well and a vertical well are connected in a butt-joint mode in a transition area between a fractured zone and a curved sinking zone, and the horizontal section of the horizontal well is properly close to the return airway side of a stope working face; a large-diameter extraction pipe with the diameter larger than 200 mm is adopted, segmentation hydraulic fracturing, segmentation sealing and the gradient negative pressure extraction technology are used, and different extraction wells are selected to conduct coal-bed gas extraction in different coal mining stages. According to the method, after coal stoping, synchronous extraction in different zones can be achieved in time, three-dimensional type extraction in different zones can be achieved in space, the coal-bed gas extraction efficiency is improved, meanwhile, surrounding rock gas of top plates of a coal bed can be extracted, and the united extraction of different types of gases and multiple purposes of one well are achieved.

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 Applications(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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