Response relation between fracturing curve and reservoir pollution degree of coalbed methane wells

Authors

ZHUANG Dengdeng, School of Geoscience and Surveying Engineering, China University of Mining and Technology(Beijing), Beijing 100083, China
WANG Yanbin, School of Geoscience and Surveying Engineering, China University of Mining and Technology(Beijing), Beijing 100083, China
TAO Chuanqi, School of Geoscience and Surveying Engineering, China University of Mining and Technology(Beijing), Beijing 100083, China
CHEN Yan, School of Geoscience and Surveying Engineering, China University of Mining and Technology(Beijing), Beijing 100083, China; Department of Petroleum Geology, Research Institute of Petroleum Exploration Development, Beijing 100083, China

Abstract

In order to study the relationship between response curve and the pollution degree of fractured reservoir, taking Shizhuang block in Qinshui basin as an example, wells with different sensitivity of reservoir in the block were selected, through comparison of the difference of the dropping trace characteristics after the hydraulic curve reaches the fracture pressure in the fracturing curves of fracturing operation in different wells, the response law of hydraulic dropping trace and the reservoir sensitivity was summed up. Then in the same block according to the dropping trace of the hydraulic curves, the sensibility of reservoir was judged in several wells. According to the calculation model of reservoir permeability damage ratio, the permeability damage ratio of several well development sections was calculated. The results found that the wells with strong predicted reservoir sensibility had higher reservoir permeability damage ratio, and reservoir was seriously polluted. Wells with weak reservoir sensibility was slightly polluted. It shows that the dropping trace after the hydraulic curve reaches the fracture pressure can reflect the reservoir pollution degree, and provides the basis for later engineering development.

Keywords

fracturing curve, dropping trace, reservoir sensitivity, permeability damage ratio, contamination degree

DOI

10.3969/j.issn.1001-1986.2019.01.014

Recommended Citation

ZHUANG Dengdeng, WANG Yanbin, TAO Chuanqi, et al. (2019) "Response relation between fracturing curve and reservoir pollution degree of coalbed methane wells," Coal Geology & Exploration: Vol. 47: Iss. 1, Article 15.
DOI: 10.3969/j.issn.1001-1986.2019.01.014
Available at: https://cge.researchcommons.org/journal/vol47/iss1/15

Reference

[1] 卢国军,刘彬,王力,等. 中国煤层气储层伤害分析及钻井液储层保护研究现状[J]. 煤田地质与勘探,2016,44(2):121-126. LU Guojun,LIU Bin,WANG Li,et al. Analysis of CBM reservoir damage and status of research on reservoir protection with drilling fluids in China[J]. Coal Geology & Exploration, 2016,44(2):121-126.

[2] 吕帅锋,王生维,张晓飞,等. 煤层气钻井固相物污染特征及评价[J]. 煤田地质与勘探,2017,45(1):162-167. LYU Shuaifeng,WANG Shengwei,ZHANG Xiaofei,et al. Pollution characteristics and evaluation of solid-phase materials in CBM drilling[J]. Coal Geology & Exploration,2017,45(1):162-167.

[3] 许明标,宋建建,由福昌. 固井水泥浆对储层损害的再认识[J]. 断块油气田,2017,24(5):731-734. XU Mingbiao,SONG Jianjian,YOU Fuchang. Re-recognition of cement slurry damage to reservoir[J]. Fault-Block Oil & Gas Field,2017,24(5):731-734.

[4] 陈军,马玄,岳前升,等. 沁水盆地清水钻井液对煤储层损害机理[J]. 煤矿安全,2014,45(11):68-71. CHEN Jun, MA Xuan, YUE Qiansheng, et al. Damage mechanism of clear water drilling fluid on coal reservoir in Qinshui basin[J]. Safety in Coal Mines,2014,45(11):68-71.

[5] 杨帆,彭小龙,莫非,等. 沁水盆地柿庄南区块煤层气开发现状分析[J]. 内蒙古石油化工,2016,42(4):34-36. YANG Fan,PENG Xiaolong,MO Fei,et al. Coalbed methane development status of south block in Shizhuang of Qinshui basin[J]. Inner Mongolia Petrochemical Industry,2016,42(4):34-36.

[6] 林鑫,张士诚,张劲,等. 柳林煤层气储层敏感性评价实验[J]. 煤田地质与勘探,2011,39(6):28-31. LIN Xin,ZHANG Shicheng,ZHANG Jin,et al. Sensitivity evaluation experiment of Liulin CBM reservoir[J]. Coal Geology & Exploration,2011,39(6):28-31.

[7] 田永东,武杰. 沁水盆地南部高煤阶煤储层敏感性[J]. 煤炭学报,2014,39(9):1835-1839. TIAN Yongdong,WU Jie. Sensitivity of high-rank coalbed methane reservoir in the southern Qinshui basin[J]. Journal of China Coal Society,2014,39(9):1835-1839.

[8] 耿昀光,汤达祯,许浩,等. 安泽区块煤储层孔裂隙特征及水敏效应损害机理[J]. 煤炭科学技术,2017,45(5):175-180. GENG Yunguang,TANG Dazhen,XU Hao,et al. Pore cracking features of coal reservoir in Anze block and water sensitive effect failure mechanism[J]. Coal Science and Technology,2017, 45(5):175-180.

[9] 张永平,杨艳磊,唐新毅,等. 沁南地区高煤阶煤储层流速敏感性及影响因素[J]. 煤田地质与勘探,2015,43(4):36-40. ZHANG Yongping,YANG Yanlei,TANG Xinyi,et al. Velocity sensitivity and its influencing factors of high-rank coal reservoirs in southern Qinshui basin[J]. Coal Geology & Exploration, 2015,43(4):36-40.

[10] 高向东,王延斌,张崇崇. 钻井中煤体结构特征与井壁稳定性分析研究[J]. 煤炭科学技术,2016,44(5):95-99. GAO Xiangdong,WANG Yanbin,ZHANG Chongchong. Study and analysis on coal structure features during drilling operation and well wall stability[J]. Coal Science and Technology,2016, 44(5):95-99.

[11] 刘勇,卢义玉,魏建平,等. 降低井下煤层压裂起裂压力方法研究[J]. 中国安全科学学报,2013,23(9):96-100. LIU Yong,LU Yiyu,WEI Jianping,et al. A novel method for decreasing coal seam fracture initiation pressure[J]. China Safety Science Journal,2013,23(9):96-100.

[12] 计勇,曹砚锋,于继飞,等. 煤层气井高破裂压力因素分析及解决措施[J]. 重庆科技学院学报(自然科学版),2016,18(3):74-77. JI Yong,CAO Yanfeng,YU Jifei,et al. Exploration of solutions and analysis on the factors of high fracturing pressure of coalbed methane well[J]. Journal of Chongqing University of Science and Technology(Natural Science Edition),2016,18(3):74-77.

[13] 胡奇,王生维,张晨,等. 沁南地区煤体结构对煤层气开发的影响[J]. 煤炭科学技术,2014,42(8):65-68. HU Qi,WANG Shengwei,ZHANG Chen,et al. Coal structure affected to coalbed methane development in Qinnan region[J]. Coal Science and Technology,2014,42(8):65-68.

[14] 范翔宇,龚明,夏宏泉,等. 裂缝性致密砂岩储层钻井液侵入深度的定量计算方法[J]. 天然气工业,2012,32(6):60-64. FAN Xiangyu,GONG Ming,XIA Hongquan,et al. A quantitative calculation method of the invasion depth of drilling fluids into the fractured tight sandstone reservoirs[J]. Natural Gas Industry,2012,32(6):60-64.

[15] 范翔宇,夏宏泉,陈平,等. 钻井泥浆污染储层程度的测井评价方法研究[J]. 天然气工业,2005,25(10):100-102. FAN Xiangyu,XIA Hongquan,CHEN Ping,et al. Logging evaluation mechanism of reservoir pollution level by drilling fluid[J]. Natural Gas Industry,2005,25(10):100-102.