首页|Optimal depth of in-situ pressure-preserved coring in coal seams considering roadway excavation and drilling disturbance

Optimal depth of in-situ pressure-preserved coring in coal seams considering roadway excavation and drilling disturbance

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Using pressure-preserved coring technique to determine in-situ gas content provides a more precise assessment of gas resource reserves and safeguard of mining safety in coal seams.How coring technique and depth affect the determination of gas content is unclear due to borehole zoning rupture caused by roadway excavation and drilling disturbance.To this end,a proposed coupling model of stress distri-bution and gas migration was simulated and validated by FLAC3D and COMSOL Multiphysics considering superposition effects of roadway excavation and drilling disturbance.The findings indicate that the roadway surrounding rock displays distinct zoning features including stress relief zone,stress concen-tration zone that is composed of plastic zone,elastic zone,and original stress zone;and the broken situations depending on the borehole peeping are consistent with the corresponding simulation results.On this basis,this study proposes a set of drilling coring depth calculation and prediction model for the gas desorption affected area under engineering disturbance.Optimal depth of coring drilling is not only approach to the in-situ coal bulk,but also can get the balance of the drilling workload and cost con-trolling.According to the typical mine site geological conditions and the numerical simulation results in this study,if the roadway excavation time is-1 year,it is recommended that the pressure-preserved coring depth should be greater than 17 m.

In-situ fidelity coringIn-situ pressure preserved coringGas contentDrilling disturbanceCoring depthExcavation damage zone

Peng-Fei Cui、De-Lei Shang、Peng Chu、Ju Li、Da-Li Sun、Tian-Yu Wang、Ming-Zhong Gao、He-Ping Xie

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State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering,Institute of Deep Earth Sciences and Green Energy,Shenzhen University,Shenzhen,518060,Guangdong,China

Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization,Shenzhen Key Laboratory of Deep Underground Engineering Sciences and Green Energy,College of Civil and Transportation Engineering,Shenzhen University,Shenzhen,518060,Guangdong,China

School of Mechanical Engineering,Sichuan University,Chengdu 610065,Sichuan,China

Jin Shi Drill Tech Co.,Ltd,Tangshan,063004,Hebei,China

State Key Laboratory of Hydraulics and Mountain River Engineering,Sichuan University,Chengdu 610065,Sichuan,China

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2024

10.1016/j.petsci.2024.05.014

石油科学(英文版)
中国石油大学（北京）

石油科学(英文版)

EI
影响因子：0.88
ISSN：1672-5107
年,卷(期)：2024.21(5)