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

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

机构地区：[1]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 [2]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 [3]State Key Laboratory of Hydraulics and Mountain River Engineering,Sichuan University,Chengdu,610065,Sichuan,China [4]School of Mechanical Engineering,Sichuan University,Chengdu,610065,Sichuan,China [5]Jinshi Drilltech Co.,Ltd.,Tangshan,063004,Hebei,China

出　　处：《Petroleum Science》2024年第5期3517-3534,共18页石油科学（英文版）

基　　金：supported by National Natural Science Foundation of China (Nos. 51827901, 52104096);the Shenzhen National Science Fund for Distinguished Young Scholars (No. RCJC20210706091948015);Open Fund of State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University (No. SKHL2216);National Key R & D Program of China (No. 2022YFB3706605);Youth Foundation of Sichuan Natural Science Foundation (No. 2023NSFSC0780)。

摘　　要：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 distribution and gas migration was simulated and validated by FLAC^(3D) 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 concentration 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 controlling. 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.

关 键 词：In-situ fidelity coring In-situ pressure preserved coring Gas content Drilling disturbance Coring depth Excavation damage zone 

分 类 号：TE244[石油与天然气工程—油气井工程]