Hydroelectric simulation test of coalbed methane in symmetric multi branch horizontal wells

被引：0
|
作者：
Li Y. [1 ,2 ]
Liu H. [1 ,2 ]
Jia J. [1 ,2 ]
机构：
[1] School of Safety Science and Engineering, Liaoning Technical University, Fuxin
[2] Key Laboratory of Mine Thermodynamic Disasters and Control, Ministry of Education, Fuxin
来源：
Meitan Kexue Jishu/Coal Science and Technology (Peking) | 2022年 / 50卷 / 10期
关键词：
coalbed methane; hydropower simulation; inter-branch interference phenomenon; multi-branch horizontal well; permeability law of coalbed methane; production efficiency;
D O I：
10.13199/j.cnki.cst.2020-1580
中图分类号：
学科分类号：
摘要：
Since multi-branch horizontal wells are wells with complex structures, the seepage law of underground fluids can’t be described accurately by conventional numerical simulation methods and mathematical analysis. In order to observe the flow of coal bed methane(CBM) more intuitively under complex conditions, hydropower simulation experiment platform is designed and built on base of the theory of porous media to comprehensively study the influence of borehole structural parameters such as branch number, branch length, branch angle, etc. on the distribution of coal-bed pressure, total productivity and productivity per unit length, and analyze to veri⁃ fy whether there is branch interference between multi branch horizontal wells. The results show that the influence of borehole structure pa⁃ rameters on the pressure curve of CBM mainly includes that the value of isobars of pressure distribution of CBM decreases continuously with the increase of the number and length of branches corresponding to the same coordinate points and isobars of pressure distribution be⁃ come sparse on the whole, which means that the isobars of pressure distribution of CBM and the pumping range increase with the increase of the number of branches;When the branch angle is 30°, 45° and 60°, the deformation amplitude of 45° branch angle is the most obvi⁃ ous; The pressure curve of coalbed methane is greatly affected by the fingertip effect of branches. There is interference between symmetric multi-branch horizontal wells and its branches. The key to control the interference is to reasonably control the relationship of branch num⁃ ber, branch length and branch angle by adjusting the comprehensive shape parameters. The optimization level among the branch number, branch length and branch angle is branch number>branch length>branch angle; When the test parameters are 4 branches, 200 mm branch length and 45 ° branch angle, the borehole structure parameters can control the branch interference extremely, the production efficiency and production cost of CBM can reach the best state. © 2022 China Coal Society. All rights reserved.
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页码：135 / 142
页数：7
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