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| Study on the distribution of "three zones" of roadway side and the sealing depth of borehole along the formation |
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Received:March 14, 2020
Revised:March 17, 2020
Accepted:March 23, 2020
Published Online:January 29, 2021
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| DOI： |
| KeyWord:Bedding drilling; Gas extraction; hole sealing; reasonable depth; gas content method |
| Author | Institution |
| WU Jin-qi |
Shanxi Lanhua Kechuang Yuxi Coal Mine Co.,Ltd.,Shanxi Jincheng ;China |
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| Abstract: |
| Based on the importance of reasonable sealing depth, in order to improve the gas extraction concentration and efficiency of drilling along the seam in Yuxi coal mine, according to the on-site measurement conditions of Yuxi coal mine, the gas content measurement method is used to study the distribution law of "three zones" in the roadway,which will determine the loose circle around the roadway and obtain the reasonable sealing depth range of drilling along the seam. Through the verification of the field drainage effect, it is proved that the reasonable sealing depth of the borehole should exceed the peak point of the stress in the concentrated stress zone. At last, it is determined that the reasonable sealing depth of the borehole in Yuxi coal mine is 12.5m, which greatly improves the drainage concentration of the gas, prolongs the drainage attenuation period, provides technical support for the long-term pre drainage of the coal seam gas, and realizes the high concentration gas in the mine. The stable utilization of the technology has increased the security and created economic benefits. |
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