Theoretical basis of dredging and efficient development of high−rank coalbed methane in China: A case study of the Qinshui Basin

Authors

ZHU Qingzhong, PetroChina Huabei Oilfield Company, Renqiu 062552, ChinaFollow

Abstract

China is rich in high-rank coalbed methane(CBM) resources, which accounts for more than 90% of the total production of CBM in China. The efficient development and utilization of high-rank coal and coalbed methane(CBM) resources is of great practical significance for ensuring national energy strategic security and helping to achieve the strategic goals of “carbon peak and carbon neutrality”. The coalbed methane industry in China is generally characterized by low exploration and development degree, poor adaptability of main technology, low rate of return on investment and small development scale. The large-scale and efficient development of coalbed methane is faced with great challenges. Through in-depth analysis of the problems in exploration and development, it is concluded that the core problems restricting the efficient development of coalbed methane industry are all due to the unclear understanding of the characteristics of coal reservoir, especially the occurrence, migration and production of original gas and water, and the lack of matching development theory and supporting engineering technology. Aiming at these problems, the study on the regularity of occurrence and production of CBM water was carried out, and the theory of efficient development of CBM and supporting engineering technology were formed by combining laboratory test with field practice. The results show that: (1) The main factors affecting the efficient development of coalbed methane in China are complicated reservoir forming process, diverse gas reservoir types, strong objective conditions of heterogeneity, insufficient support of top design, and unclear adaptability of main technology; (2) The complex double pore structure of pore-fissure in coal seam and the inherent regularity of gas and water occurrence, production and migration determine that “dredging” and “guiding” must be taken as the leading ideas to realize the full communication between reservoir and wellbore and the efficient production of fluid; (3) Taking high-rank coal in Qinshui Basin as an example, the supporting development technology based on the dredging development theory can effectively realize efficient large-scale construction and production, and significantly improve the development effect of coalbed methane.

Funding Information

10.12363/issn.1001-1986.21.12.0845

Keywords

high-rank coal, water gas occurrence, dredging development theory, optimization of development mode, drainage control method

Recommended Citation

Z. (2022) "Theoretical basis of dredging and efficient development of high−rank coalbed methane in China: A case study of the Qinshui Basin," Coal Geology & Exploration: Vol. 50: Iss. 3, Article 9.
Available at: https://cge.researchcommons.org/journal/vol50/iss3/9

Reference

[1] 朱庆忠,杨延辉,左银卿,等. 对于高煤阶煤层气资源科学开发的思考[J]. 天然气工业,2020,40(1):55−60. ZHU Qingzhong,YANG Yanhui,ZUO Yinqing,et al. On the scientific exploitation of high-rank CBM resources[J]. Natural Gas Industry,2020,40(1):55−60.

[2] 陈跃,马卓远,马东民,等. 不同宏观煤岩组分润湿性差异及对甲烷吸附解吸的影响[J]. 煤炭科学技术,2021,49(11):47−55. CHEN Yue,MA Zhuoyuan,MA Dongmin,et al. Effects of wettability differences of different macroscopic composition of coal on methane adsorption and desorption[J]. Coal Science and Technology,2021,49(11):47−55.

[3] 李沛,马东民,张辉,等. 高、低阶煤润湿性对甲烷吸附/解吸的影响[J]. 煤田地质与勘探,2016,44(5):80−85. LI Pei,MA Dongmin,ZHANG Hui,et al. Influence of high and low rank coal wettability and methane adsorption/desorption characteristics[J]. Coal Geology & Exploration,2016,44(5):80−85.

[4] 村田逞诠. 煤的润湿性研究及其应用[M]. 朱春笙，龚祯祥译. 北京：煤炭工业出版社，1992.

[5] 孙晓晓,姚艳斌,陈基瑜,等. 基于低场核磁共振的煤润湿性分析[J]. 现代地质,2015,29(1):190−197. SUN Xiaoxiao,YAO Yanbin,CHEN Jiyu,et al. Determination of coal wettability by using low-field nuclear magnetic resonance[J]. Geoscience,2015,29(1):190−197.

[6] 董平,单忠健,李哲. 超细煤粉表面润湿性的研究[J]. 煤炭学报,2004,29(3):346−349. DONG Ping,SHAN Zhongjian,LI Zhe. Study on the surface wet characteristic of ultrafine coal powder[J]. Journal of China Coal Society,2004,29(3):346−349.

[7] 王诗萌. 润湿性岩石表面气体吸附行为的分子模拟研究[D]. 北京：中国石油大学(北京)，2016.

WANG Shimeng. Molecular dynamics investigation on the adsorption behaviors of gases on wetting rock surface[D]. Beijing：China University of Petroleum(Beijing)，2016.

[8] 刘谦,郭玉森,赖永明,等. 煤的吸附特性与表面能关系的实验研究[J]. 煤矿安全,2015,46(9):20−22. LIU Qian,GUO Yusen,LAI Yongming,et al. Experimental research on relationship between adsorption characteristics and surface energy of coal[J]. Safety in Coal Mines,2015,46(9):20−22.

[9] 谢松彬,姚艳斌,陈基瑜,等. 煤储层微小孔孔隙结构的低场核磁共振研究[J]. 煤炭学报,2015,40(增刊1):170−176. XIE Songbin,YAO Yanbin,CHEN Jiyu,et al. Research of micro-pore structure in coal reservoir using low-field NMR[J]. Journal of China Coal Society,2015,40(Sup.1):170−176.

[10] YAO Yanbin,LIU Dameng,CHE Yao,et al. Petrophysical characterization of coals by low-field nuclear magnetic resonance (NMR)[J]. Fuel,2010,89(7):1371−1380.

[11] ZHENG Sijian,YAO Yanbin,ELSWORTH D,et al. A novel pore size classification method of coals:Investigation based on NMR relaxation[J]. Journal of Natural Gas Science and Engineering,2020,81:103466.

[12] 李树刚,白杨,林海飞,等. CH₄,CO₂和N₂多组分气体在煤分子中吸附热力学特性的分子模拟[J]. 煤炭学报,2018,43(9):2476−2483. LI Shugang,BAI Yang,LIN Haifei,et al. Molecular simulation of adsorption thermodynamics of multicomponent gas in coal[J]. Journal of China Coal Society,2018,43(9):2476−2483.

[13] LONG Hang,LIN Haifei,YAN Min,et al. Molecular simulation of the competitive adsorption characteristics of CH₄,CO₂,N₂,and multicomponent gases in coal[J]. Powder Technology,2021,385:348−356.

[14] 刘冰,张松航,唐书恒,等. 无越流补给含水层对煤层气排采影响的数值模拟[J]. 煤田地质与勘探,2021,49(2):43−53. LIU Bing,ZHANG Songhang,TANG Shuheng,et al. Numerical simulation of the influence of no-flow recharge aquifer on CBM drainage[J]. Coal Geology & Exploration,2021,49(2):43−53.

[15] 孟艳军,汤达祯,许浩,等. 煤层气解吸阶段划分方法及其意义[J]. 石油勘探与开发,2014,41(5):612−617. MENG Yanjun,TANG Dazhen,XU Hao,et al. Division of coalbed methane desorption stages and its significance[J]. Petroleum Exploration and Development,2014,41(5):612−617.

[16] 胡友林,乌效鸣. 煤层气储层水锁损害机理及防水锁剂的研究[J]. 煤炭学报,2014,39(6):1107−1111. HU Youlin,WU Xiaoming. Research on coalbed methane reservoir water blocking damage mechanism and anti-water blocking[J]. Journal of China Coal Society,2014,39(6):1107−1111.

[17] SHANG Xiaopeng,ZHANG Xuan,NGUYEN T,et al. Direct numerical simulation of evaporating droplets based on a sharp-interface algebraic VOF approach[J]. International Journal of Heat and Mass Transfer,2022,184:122282.

[18] 宋帅,周劲辉,范德元,等. 高阶煤压裂液伤害机理研究[J]. 煤炭技术,2018,37(5):161−163. SONG Shuai,ZHOU Jinhui,FAN Deyuan,et al. Study on damage mechanism of fracturing fluid in high rank coal[J]. Coal Technology,2018,37(5):161−163.

[19] 白建平,武杰. 压裂液对煤储层伤害实验及应用:以沁水盆地西山区块为例[J]. 煤田地质与勘探,2016,44(4):77−80. BAI Jianping,WU Jie. Experiment and application of fracturing fluid damage to coal reservoir:A case of Xishan block in Qinshui Basin[J]. Coal Geology & Exploration,2016,44(4):77−80.

[20] MENG Ya,LI Zhiping,LAI Fengpeng. Influence of effective stress on gas slippage effect of different rank coals[J]. Fuel,2021,285:119207.

[21] YANG Yun,LIU Shimin. Estimation and modeling of pressure-dependent gas diffusion coefficient for coal:A fractal theory-based approach[J]. Fuel,2019,253:588−606.