Practice and understanding of multi-layer drainage of CBM wells in Liupanshui area

Authors

LIU Jiang, School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China
SANG Shuxun, School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, ChinaFollow
ZHOU Xiaozhi, School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China
BI Caiqin, Oil and Gas Survey, China Geological Survey, Beijing 100089, China
JIN Jun, Coal Geological Bureau of Guizhou, Guiyang 550009, China
SHAN Yansheng, Oil and Gas Survey, China Geological Survey, Beijing 100089, China

Abstract

To improve the effect of drainage and extraction of coalbed methane wells, it is necessary to divide the drainage and production stages reasonably and formulate corresponding control measures. Based on the previous exploration and trial production of coalbed methane in Liupanshui area, this paper analyzed the geological characteristics of coalbed methane and the development characteristics of coal reservoirs in the area, and studied the drainage effect of the combined layers of two wells comparatively. The research shows that the area has several basic characteristics, including many coal seams, thin single-layer thickness, high gas content, high reservoir pressure, low coal seam permeability, and local developed tectonic coal, which leads to the pressure-sensitive effect and obvious Jiamin effect in the drainage process, so it caused serious reservoir damage, short production time and low production of coalbed gas wells. Therefore, it is preferable to perform perforating fracturing for a native structure with excellent media and good gas-bearing properties. During the combined mining and drainage process, the phases of combined mining and drainage was clearly divided, and it was pointed out that according to the drainage and mining stage, the flow pressure, casing pressure, flow pressure drop, sleeve pressure drop and liquid height should be controlled to reduce reservoir damage such as pressure sensitivity effect, Jiamin benefit, and speed sensitivity effect; The steady rise in gas production should be controlled, and long-term stable production and high production of coalbed gas wells should be achieved.

Keywords

CBM, development of multi-layer section, multi-layer drainage, drainage control, Liupanshui area in Guizhou

DOI

10.3969/j.issn.1001-1986.2020.03.014

Recommended Citation

LIU Jiang, SANG Shuxun, ZHOU Xiaozhi, et al. (2020) "Practice and understanding of multi-layer drainage of CBM wells in Liupanshui area," Coal Geology & Exploration: Vol. 48: Iss. 3, Article 15.
DOI: 10.3969/j.issn.1001-1986.2020.03.014
Available at: https://cge.researchcommons.org/journal/vol48/iss3/15

Reference

[1] 黄华州,桑树勋,苗耀,等. 煤层气井合层排采控制方法[J]. 煤炭学报,2014,39(增刊2):422-431. HUANG Huazhou,SANG Shuxun,MIAO Yao,et al. Drainage control of single vertical well with multi-hydraulic fracturing layers for coalbed methane development[J]. Journal of China Coal Society,2014,39(S2):422-431.

[2] 吴国代,郭东鑫,程礼军,等. 松藻矿区多煤层合采储层压降特征及启示[J]. 煤田地质与勘探,2018,46(5):123-128. WU Guodai,GUO Dongxin,CHENG Lijun,et al. Characteristics and revelation of pressure drop of reservoir during combined CBM production of multi-coal seams in Songzao mining area[J]. Coal Geology & Exploration,2018,46(5):123-128.

[3] 徐宏杰. 贵州省薄-中厚煤层群煤层气开发地质理论与技术[D]. 徐州:中国矿业大学,2012. XU Hongjie. Geological theory and technology for coalbed methane development with thin and medium coal seam zones in Guizhou[D]. Xuzhou:China University of Mining and Technology,2012.

[4] 周培明,金军,罗开艳,等. 黔西松河井田多层叠置独立含煤层气系统[J]. 煤田地质与勘探,2017,45(5):66-69. ZHOU Peiming,JIN Jun,LUO Kaiyan,et al. Unattached multiple layer superimposed coalbed methane system in Songhe mine,west Guizhou[J]. Coal Geology & Exploration,2017,45(5):66-69.

[5] 陈本金,温春齐,曹盛远,等. 贵州六盘水煤层气勘探开发有利目标区优选[J]. 西南石油大学学报(自然科学版),2010,32(3):56-60. CHEN Benjin,WEN Chunqi,CAO Shengyuan,et al. Determination of favorable target areas of coalbed methane exploration and production in Liupanshui,Guizhou[J]. Journal of Southwest Petroleum University(Science and Technology Edition),2010,32(3):56-60.

[6] 蔡佳丽,汤达祯,许浩,等. 黔西上二叠统煤的孔隙特征及其控制因素[J]. 煤田地质与勘探,2011,39(5):6-10. CAI Jiali,TANG Dazhen,XU Hao,et al. Pore characteristics and controlling factors of Upper Permian coal in western Guizhou[J]. Coal Geology & Exploration,2011,39(5):6-10.

[7] 韩文龙,王延斌,刘度,等. 煤层气直井产气曲线特征及其与储层条件匹配性[J]. 煤田地质与勘探,2019,47(3):97-104. HAN Wenlong,WANG Yanbin,LIU Du,et al. The matching of gas production curve characteristic and reservoir conditions in vertical coalbed methane wells[J].Coal Geology & Exploration,2019,47(3):97-104.

[8] 易同生,李新民. 贵州省六盘水煤田盘关向斜煤层气开发地质评价[J]. 中国煤田地质,2006,18(2):30-32. YI Tongsheng,LI Xinmin. Development geology assessment on coalbed methane in Panguan syncline of Liupanshui coal field[J]. Coal Geology of China,2006,18(2):30-32.

[9] 易同生,高为,周培明. 贵州省煤层气资源特征及开发技术[J]. 中国煤炭地质,2018,30(6):35-40. YI Tongsheng,GAO Wei,ZHOU Peiming. CBM resource features and exploitation technology in Guizhou Province[J]. Coal Geology of China,2018,30(6):35-40.

[10] 易同生,周效志,金军. 黔西松河井田龙潭煤系煤层气-致密气成藏特征及共探共采技术[J]. 煤炭学报,2016,41(1):212-220. YI Tongsheng,ZHOU Xiaozhi,JIN Jun. Reservoir forming characteristics and co-exploration and concurrent production technology of Longtan coal measure coalbed methane & tight gas in Songhe field,western Guizhou[J]. Journal of China Coal Society,2016,41(1):212-220.

[11] 康永尚,邓泽,刘洪林. 我国煤层气井排采工作制度探讨[J]. 天然气地球科学,2008,19(3):423-426. KANG Yongshang,DENG Ze,LIU Honglin. Discussion about the CBM well draining technology[J]. Natural Gas Geoscience,2008,19(3):423-426.

[12] YANG Zhaobiao,QIN Yong,YI Tongsheng,et al. Analysis of multi-coalbed CBM development methods in western Guizhou,China[J]. Geosciences Journal,2019,23(2):315-325.

[13] 姜杉钰,康永尚,杨通保,等. 云南恩洪煤层气区块单井多煤层合采方式探讨[J]. 煤田地质与勘探,2018,46(2):80-89. JIANG Shanyu,KANG Yongshang,YANG Tongbao,et al. Combined CBM drainage of multiple seams by single well in Enhong block,Yunnan Province[J]. Coal Geology & Exploration,2018,46(2):80-89.

[14] 杨建超,李贵红,刘钰辉,等. 晋城地区煤层气井多层合采效果评价[J]. 煤田地质与勘探,2019,47(6):26-31. YANG Jianchao,LI Guihong,LIU Yuhui,et al. Evaluation of coalbed methane drainage effect for multi-target seams in Jincheng region[J]. Coal Geology & Exploration,2019,47(6):26-31.

[15] 徐晓乾,孟应芳,段正鹏,等. 贵州省煤层气(瓦斯)开发适用性技术分析[J]. 煤田地质与勘探,2019,47(6):8-13. XU Xiaoqian,MENG Yingfang,DUAN Zhengpeng,et al. Analysis of suitable development technology of CBM(gas) in Guizhou[J]. Coal Geology & Exploration,2019,47(6):8-13.

[16] 侯登才,周效志,黄华州. 黔西土城区块煤层气井合层排采工艺研究[J]. 煤炭科学技术,2016,44(2):78-83. HOU Dengcai,ZHOU Xiaozhi,HUANG Huazhou. Study on gas drainage technique for combined seam with coalbed methane well in Tucheng b1ock of west Guizhou[J]. Coal Science and Technology,2016,44(2):78-83.

[17] 李国彪,李国富. 煤层气井单层与合层排采异同点及主控因素[J]. 煤炭学报,2012,37(8):1354-1358. LI Guobiao,LI Guofu. Study on the differences and main controlling factors of the coalbed methane wells between single layer and multi-layer drainage[J]. Journal of China Coal Society,2012,37(8):1354-1358.

[18] 姜玮. 多煤层区煤层气单井压裂/排采模式研究:以织纳煤田为例[D]. 徐州:中国矿业大学,2015. JIANG Wei. Study on the CBM single wells fracturing/drainage model of multi-coalbeds area in Zhina coal field[D]. Xuzhou:China University of Mining and Technology,2015.

[19] JU Wei,YANG Zhaobiao,QIN Yong,et al. Characteristics of in-situ stress state and prediction of the permeability in the Upper Permian coalbed methane reservoir,western Guizhou region,SW China[J]. Journal of Petroleum Science and Engineering,2018,165:199-211.

[20] LIU Huihu,SANG Shuxun,XUE Junhua,et al. Evolution and geochemical characteristics of gas phase fluid and its response to inter-well interference during multi-well drainage of coalbed methane[J]. Journal of Petroleum Science and Engineering,2017,162:491-501.