Influencing factors and technology optimization of coalbed methane well fracturing:Taking Hancheng mining area as an example
Received date: 2016-05-26
Revised date: 2016-11-19
Online published: 2017-02-10
Based on a large number of fracturing data at home and abroad,through theoretical and experimental data,the influences of different parameters on hydraulic fracture formation and extension are studied.The parameters include the difference coefficient of horizontal principal stress within layers,the difference of minimum horizontal principal stress between layers,the rock mechanics parameters,the difference coefficient of internal coal and rock fracture pressures and the properties of rock interface.According to field fracturing and production data,the influences of geological and fracturing engineering parameters on gas production are analyzed,such as the earth stress conditions,the fracturing technology,the volume of fracturing fluid,the amount of sand,the system of fracturing fluid,the interval of fracturing perforation and the technology of secondary fracturing,all of which have important influences on the production.Through the optimization of the technology,the reasonable fracturing technology and parameters are offered for Hancheng mining area.The ideal effects have been achieved in the practical field application.This work provides a theoretical basis and a reference index for the implementation of the middle-high rank coal reservoirs fracturing technology in China.
Key words： Coal bed methane; Fracturing; Gas production; Principal stress; Cracks
Ma Ping-hua，Huo Meng-ying，He Jun，Peng Ying-ming，Shao Xian-jie，Jie Jing-tao . Influencing factors and technology optimization of coalbed methane well fracturing:Taking Hancheng mining area as an example[J]. Natural Gas Geoscience, 2017 , 28(2) : 296 -304 . DOI: 10.11764/j.issn.1672-1926.2016.12.011
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