A coalbed methane multi-branch horizontal well system suitable for monocline structure
A multi-lateral and horizontal well technology, applied in directional drilling and other directions, can solve the problems of uncontrollable resources and horizontal wells that cannot be drilled in the well section, and achieve the effect of increasing the gas production of a single well, increasing the control area of a single well, and reducing the number of wells.
Inactive Publication Date: 2015-12-09
华北石油管理局有限公司
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[0003] The purpose of the present invention is to provide a coalbed methane multi-branch horizontal well system suitable for monocline structure, to solve the problem that in the development of monocline structure coalbed methane, the well section between the process well and the drainage well cannot drill horizontal well branches, resulting in Problems beyond the control of this part of resources
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[0011] The present invention will be further described below in conjunction with specific embodiments. A coalbed methane multi-branch horizontal well system suitable for monocline structure according to the present invention is composed of two or more multi-branch horizontal well groups, and this embodiment is composed of three multi-branch horizontal well groups, The accompanying drawings can be used as structural schematic diagrams of this embodiment.
[0012] There is a monoclinic structural coal seam in a sedimentary basin, the dip angle of the coal seam is 4°, the depth of the coal seam is 620m, and the thickness of the coal seam is 6.5m. Firstly, a vertical well is drilled at the high position of the monocline structure as the remote connecting well (3) of the first process well, and the well adopts a double-opening shaft structure. The D311.2mm roller cone bit was used to drill through the bedrock weathered zone for 20m, and the drilling was completed at a depth of 60m...
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The invention discloses a CBM (Coal-Bed Methane) multi-branch horizontal well system suitable for a uniclinal structure, and belongs to the field of mining ground CBM. The CBM multi-branch horizontal well system consists of two or more than two multi-branch horizontal well groups, wherein each multi-branch horizontal well group consists of a technology well, a near-end communicating well and a far-end communicating well, the far-end communicating well of the second multi-branch horizontal well group is the near-end communicating well of the first multi-branch horizontal well group, multiple multi-branch horizontal well groups are in series connection in sequence, and the multi-branch horizontal well system of which a main branch horizontal section length is the sum of main branch lengths of the multi-branch technology well groups is formed; all the near-end communicating wells and all the far-end communicating wells are approximately arranged on the same straight line and are respectively communicated with a main branch of each technology well. According to the CBM multi-branch horizontal well system suitable for the uniclinal structure, disclosed by the invention, the problem that resources of well sections between the technology wells and drainage and mining wells cannot be controlled in the CBM development of the uniclinal structure can be effectively solved, and meanwhile, the CBM multi-branch horizontal well system has the functions of mining together by multiple wells and monitoring in sections.
Description
technical field [0001] The invention relates to a horizontal well in the mining process of ground coal bed gas, in particular to a horizontal well system used in a monocline geological structure, and belongs to the field of ground coal bed gas mining. Background technique [0002] Monoclinic structure is one of the common structures in the development of coalbed methane, which refers to the stratum that always faces a certain direction. At present, conventional multi-branch horizontal wells are mostly used for mining. However, conventional multi-branch horizontal wells have many limitations: one is affected by the burial depth of the coal seam, the other is limited by the hook load capacity of the drilling rig, the third is limited by the phenomenon of drilling tool back pressure, and the fourth is limited by the drilling cost. Due to the above-mentioned limitations, the extension length of the horizontal section of conventional multi-branch horizontal wells in monoclinic c...
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IPC IPC(8): E21B7/04
Inventor 杨勇崔树清倪元勇王风锐魏宁
Owner 华北石油管理局有限公司