Interlayer interference mechanism of multi-seam drainage in a CBM well:An example from Zhucang syncline

作     者：Jiang Wei Wu Caifang Wang Qiao Xiao Zhenghui Liu Yang Jiang Wei;Wu Caifang;Wang Qiao;Xiao Zhenghui;Liu Yang

作者机构：Hunan Provincial Key Laboratory of Shale Gas Resource UtilizationHunan University of Science and Technology Institute of GeologySchool of Civil EngineeringHunan University of Science and Technology School of Resource & GeoscienceChina University of Mining and Technology 

出 版 物：《International Journal of Mining Science and Technology》 (矿业科学技术学报（英文版）)

年 卷 期：2016年第26卷第6期

页      面：1101-1108页

核心收录：

学科分类：0808[工学-电气工程] 0709[理学-地质学] 0819[工学-矿业工程] 081903[工学-安全技术及工程] 08[工学] 0807[工学-动力工程及工程热物理] 0708[理学-地球物理学] 0818[工学-地质资源与地质工程] 0815[工学-水利工程] 0813[工学-建筑学] 0814[工学-土木工程] 

基　　金：supported by the National Major Special Project of Science and Technology of China (No.2011ZX05034) the Innovation Projects of University Graduates in Jiangsu Province (No.CXLX13_948) the National Natural Science Foundation of China (No.41272178) the Natural Science Foundation of Hunan Province (No.2016JJ4031) 

主　　题：Zhucang syncline CBM Multi seam drainage Interlayer interference Influencing factors 

摘      要：Based on the characteristics of the strong volatility of physical property in vertical direction, high gas content, high resource abundance and large exploitation potentiality of coal reservoir in Bide-Santang basin of Zhina coal field, we study the generation mechanism of interlayer interference, propagation rules of reservoir pressure drop and influencing factors of gas productivity in CBM multi-seam drainage in the paper. On the basis of the actual production data of X-2 well of Zhucang syncline in Bide-Santang basin,by simulating the gas production process of a CBM well under the condition of multiple seam with COMET3 numerical simulation software, we analyze the influencing factors of gas productivity during the process of multi-seam drainage, and illuminate the interlayer interference mechanism of multiseam drainage. The results show that permeability, reservoir pressure gradient, critical desorption pressure and fluid supply capacity of stratum have great influence on gas productivity of multi-seam drainage while coal thickness has little influence on it. Permeability, reservoir pressure gradient and fluid supply capacity of stratum affect the propagation velocity of reservoir pressure drop and thereby affect the final gas productivity. Moreover, the influence of critical desorption pressure on gas productivity of multiseam drainage is reflected in the gas breakthrough time and effective desorption area.