Productivity prediction of hypotonic CBM test well in Jiaozuo mining area under hydraulic fracturing

Authors

WANG Zhirong, College of Environmental and Hydraulic Engineering, Zhengzhou University, Zhengzhou 450001, China
YANG Jie, College of Environmental and Hydraulic Engineering, Zhengzhou University, Zhengzhou 450001, China
CHEN Lingxia, College of Environmental and Hydraulic Engineering, Zhengzhou University, Zhengzhou 450001, China
GUO Zhiwei, College of Environmental and Hydraulic Engineering, Zhengzhou University, Zhengzhou 450001, China

Abstract

In order to explore the permeable mechanism and the output law after fracturing of CBM in the "three soft" coal seam(soft coal, soft roof and soft bottom) of Jiaozuo under hydraulic fracturing, Based on the permeable model of reservoir fracture, considering the influence of fracture porosity on permeability after fracturing, a reservoir fracture penetration model was established, the application and analysis of the test well was carried out to obtain the characteristics of pressure cracks such as length, width, permeability and reservoir parameters after fracturing. Through the comprehensive analysis of isothermal adsorption curves and historical fitting, the recovery rate of CBM was predicted, finally, combined with the obtained index parameters and recovery rate, the production of test well GW-002 in the mining area was predicted by Fracpro PT software for 2 430 d. The results show the average daily gas production is 596.87 m³/d, the recovery rate is 32.86% and the cumulative gas production is 1.09×10⁶ m³, the gas production from the software is in good agreement with the actual production data, which meets the technical requirements of CBM and could be used to guide the fracturing drainage practice and production capacity in Jiaozuo mining area.

Keywords

hydraulic fracturing, “three soft” coal seam, permeable model, recovery rate, capacity prediction

DOI

10.3969/j.issn.1001-1986.2019.03.012

Recommended Citation

WANG Zhirong, YANG Jie, CHEN Lingxia, et al. (2019) "Productivity prediction of hypotonic CBM test well in Jiaozuo mining area under hydraulic fracturing," Coal Geology & Exploration: Vol. 47: Iss. 3, Article 13.
DOI: 10.3969/j.issn.1001-1986.2019.03.012
Available at: https://cge.researchcommons.org/journal/vol47/iss3/13

Reference

[1] 张新民,赵靖舟,张培河,等. 中国煤层气技术可采资源潜力[J]. 煤田地质与勘探,2007,35(4):23-26. ZHANG Xinmin,ZHAO Jingzhou,ZHANG Peihe,et al. China coalbed gas technically recoverable resource potential[J]. Coal Geology & Exploration,2007,35(4):23-26.

[2] 王志荣,贺平,郭志伟,等. 水力压裂条件下"三软"煤层压裂渗透模型及应用[J]. 天然气地球科学,2017,28(3):349-355. WANG Zhirong,HE Ping,GUO Zhiwei,et al. The research on permeable model of hydraulic fracture and its application in "three soft" coal seams[J]. Natural Gas Geoscience,2017,28(3):349-355.

[3] 孙越英,卢耀东,王佩钰,等. 焦作煤田煤层气资源特征及开发利用研究[J]. 河南理工大学学报(自然科学版),2007,26(1):46-51. SUN Yueying,LU Yaodong,WANG Peiyu,et al. Study on the characteristics and exploitation of CBM resources in Jiaozuo coal[J]. Journal of Henan University of Technology(Natural Science Edition),2007,26(1):46-51.

[4] 李寨东,常会珍,刘坤鹏. 焦作位村矿二1煤煤层气地质特征及采收率预测[J]. 中国煤层气,2012,9(6):25-28. LI Zhaidong,CHANG Huizhen,LIU Kunpeng. Geological characteristics and oil recovery prediction of coalbed methane in No.1 coal mine of Jiaozuo Weicun mine[J]. China Coalbed Methane,2012,9(6):25-28.

[5] 吴晓东,王国强,李安启,等. 煤层气井产能预测研究[J]. 天然气工业,2004,24(8):82-84. WU Xiaodong,WANG Guoqiang,LI Anqi,et al. Study on productivity prediction of CBM wells[J]. Natural Gas Industry,2004,24(8):82-84.

[6] 曹代勇,张守仁,任德贻. 构造变形对煤化作用进程的影响:以大别造山带北麓地区石炭纪含煤岩系为例[J]. 地质论评,2002,48(3):313-317. CAO Daiyong,ZHANG Shouren,REN Deyi. Effects of tectonic deformation on coalification process:An example from the Carboniferous coal-bearing rock series in Beilu area of the Dabie orogenic belt[J]. Geological Review,2002,48(3):313-317.

[7] 侯泉林,李会军,范俊佳,等. 构造煤结构与煤层气赋存研究进展[J]. 中国科学:地球科学,2012,42(10):1487-1495. HOU Quanlin,LI Huijun,FAN Junjia,et al. Research progress on structural coal structure and CBM generation[J]. Science of China:Earth Science,2012,42(10):1487-1495.

[8] 倪小明,苏现波,张小东. 煤层气开发地质学[M]. 北京:化学工业出版社,2012,27-36.

[9] 伊向艺,雷群,丁云宏. 煤层气压裂技术及应用[M]. 北京:石油工业出版社,2012,124-148.

[10] 吕玉民,汤达祯,李治平,等. 煤层气井动态产能拟合与预测模型[J]. 煤炭学报,2011,36(9):1481-1485. LYU Yumin,TANG Dazhen,LI Zhiping,et al. Modeling and predicting model for dynamic productivity of CBM wells[J]. Journal of China Coal Society,2011,36(9):1481-1485.

[11] AGARWAL A,MANDAL A,KARMAKAR B,et al. Modeling and performance prediction for water production in CBM wells of an eastern India coal field[J]. Journal of Petroleum Science and Engineering,2013,103:115-120.

[12] 徐兵祥,李相方,胡小虎,等. 煤层气典型曲线产能预测方法[J]. 中国矿业大学学报,2011,40(5):743-747. XU Bingxiang,LI Xiangfang,HU Xiaohu,et al. A method for forecasting typical CBM production capabilities[J]. Journal of China University of Mining & Technology,2011,40(5):743-747.

[13] KING G R. Material-balance techniques for coal-seam and Devonian shale gas reservoirs with limited water influx[J]. SPE Reservoir Engineering,1993:67-72.

[14] AHMED T,CENTILMEN A,ROUX B,et al. A generalized material balance equation for coalbed methane reservoirs[J]. SPE 102638,2006:24-27.

[15] 张健,汪志明. 物质平衡法在煤层气藏生产动态预测中的应用[J]. 煤田地质与勘探,2009,37(3):23-26. ZHANG Jian,WANG Zhiming. Application of material balance method to productivity forecast in CBM reservoir[J]. Coal Geology & Exploration,2009,37(3):23-26.

[16] 杨兴东. 煤层气开采过程中裂缝系统与渗透率演化关系[J]. 辽宁化工,2013,42(10):1187-1189. YANG Xingdong. Relationship between fracture system and permeability evolution during CBM exploitation[J]. Liaoning Chemical Industry,2013,42(10):1187-1189.

[17] 张琪. 采油工程原理与设计[M]. 青岛:中国石油大学出版社,2006,250-255.

[18] 李宏欣. 焦作九里山井田煤层气赋存特征分析[J]. 中州煤炭,2012(9):4-6. LI Hongxin. Analysis of occurrence characteristics of coalbed methane in Jiulishan mine field,Jiaozuo[J]. Zhongzhou Coal Mine,2012(9):4-6.

[19] 王晓梅,张群,张培河,等. 煤层气储层数值模拟研究的应用[J]. 天然气地球科学,2004,15(6):664-668. WANG Xiaomei,ZHANG Qun,ZHANG Peihe,et al. Application of coalbed methane reservoir simulation[J]. Natural Gas Geoscience,2004,15(6):664-668.

[20] 张小东,张鹏,刘浩,等. 高煤级煤储层水力压裂裂缝扩展模型研究[J]. 中国矿业大学学报,2013,42(4):573-579. ZHANG Xiaodong,ZHANG Peng,LIU Hao,et al. Fracture extended model under hydraulic fracturing engineering for high rank coal reservoirs[J]. Journal of China University of Mining & Technology,2013,42(4):573-579.