Comprehensive analysis of CBM recovery in high rank coal reservoir of Jincheng area  

作　　者：Liu Aihua Fu Xuehai Luo Bin Luo Peipei Jiao Chunlin 

机构地区：[1]School of Resources and Geoscience, China University of Mining & Technology [2]Key Laboratory of CBM Resource and Reservoir-Generating Process, Ministry of Education [3]College of Geology and Exploration Engineering, Xinjiang University [4]Coal Geological Designing Institute of Jiangsu Province

出　　处：《International Journal of Mining Science and Technology》2013年第3期447-452,共6页矿业科学技术学报（英文版）

基　　金：supported by the National Basic Research Program of China (No. 2011ZX05034);the key program of the National Science and Technology of China (No. 2008ZX05034);the Tianshan Scholars Program Fund of Xinjiang Uygur Autonomous Region;the Priority Academic Program Development of Jiangsu Higher Education Institutions of China (PAPD)

摘　　要：Coalbed methane (CBM) predicting recovery in high rank coal reservoir varies greatly in Jincheng area and it seriously influences efficient and economic exploitation of CBM resource. In order to predict more accurate CBM recovery, we conducted history matching and productivity prediction of vertical well by using COMET 3 reservoir modeling software, innovatively adopted the gas desorption experiment of bulk coal at fixed test pressure, analyzed the recovery extent method of Daning multiple-hole horizontal well and Panzhuang well group, and calculated recovery by sorption isotherm method of 14 vertical CBM wells at the abandonment pressures 1.0, 0.7, 0.5 and 0.3 MPa, respectively. The results show that the reservoir simulation methods (numerical simulation method and the recovery extent method) is more reliable than the theoretical analysis of coal sample (sorption isotherm method and desorption experiment method). Also, desorption experiment method at fixed pressure is superior to sorption isotherm method. Through the comprehensive analysis and linear correction, CBM recovery ratios in high rank coal reservoir of Jincheng area were found to be 38.64%, 49.30%, 59.30%, and 69.20% at the abandonment pressures 1.0, 0.7, 0.5 and 0.3 MPa, respectively. The research results are of significant importance in the CBM exploration and development in Jincheng area.Coalbed methane (CBM) predicting recovery in high rank coal reservoir varies greatly in Jincheng area and it seriously influences efficient and economic exploitation of CBM resource. In order to predict more accurate CBM recovery, we conducted history matching and productivity prediction of vertical well by using COMET 3 reservoir modeling software, innovatively adopted the gas desorption experiment of bulk coal at fixed test pressure, analyzed the recovery extent method of Daning multiple-hole horizontal well and Panzhuang well group, and calculated recovery by sorption isotherm method of 14 vertical CBM wells at the abandonment pressures 1.0, 0.7, 0.5 and 0.3 MPa, respectively. The results show that the reservoir simulation methods (numerical simulation method and the recovery extent method) is more reliable than the theoretical analysis of coal sample (sorption isotherm method and desorption experiment method). Also, desorption experiment method at fixed pressure is superior to sorption isotherm method. Through the comprehensive analysis and linear correction, CBM recovery ratios in high rank coal reservoir of Jincheng area were found to be 38.64%, 49.30%, 59.30%, and 69.20% at the abandonment pressures 1.0, 0.7, 0.5 and 0.3 MPa, respectively. The research results are of significant importance in the CBM exploration and development in Jincheng area.

关 键 词：Abandoned wells Adsorption isotherms COAL Coal deposits DESORPTION Experiments Forecasting Horizontal wells Petroleum reservoirs Recovery Software testing 

分 类 号：TD87[矿业工程—非金属矿开采]