•  
  •  
 

Coal Geology & Exploration

Abstract

The resources of deep coalbed methane buried at depth of more than 1 200 m in the eastern Ordos basin are rich and the key point for further exploration and development of CBM in the future. Compared with shallow CBM fracturing, there are many challenges in deep CBM fracturing such as with high situ stress, high closure stress, breakdown pressure as well as complex mechanical parameters of rock. Combined with the existing practice of CBM fracturing, taking the deep CBM buried at depth of about 2 000 m in the eastern Ordos basin as an example, tubing+ circulating SSD +packer +tubing shoes were used as operation string and low concentration linear gel as fracturing fluid system. Through on-site operation in 2 wells, the construction is relatively smooth, gas production is quite satisfactory(the output is above 800 m3/d). It proves that the process is simple and easy and provides reference technology for deep CBM fracturing.

Keywords

deep CBM, eastern Ordos basin, fracturing technology

DOI

10.3969/j.issn.1001-1986.2019.01.013

Reference

[1] 顾娇杨,张兵,郭明强. 临兴区块深部煤层气富集规律与勘探开发前景[J]. 煤炭学报,2016,41(1):72-79. GU Jiaoyang,ZHANG Bing,GUO Mingqiang. Deep coalbed methane enrichment rules and its exploration and development prospect in Linxing block[J]. Journal of China Coal Society, 2016,41(1):72-79.

[2] 陈刚,秦勇,李五忠,等. 鄂尔多斯盆地东部深层煤层气成藏地质条件分析[J]. 高校地质学报,2012,18(3):465-473. CHEN Gang,QIN Yong,LI Wuzhong,et al. Analysis of geological conditions of deep coalbed methane reservoiring in the eastern Ordos basin[J]. Geological Journal of China Universities,2012,18(3):465-473.

[3] 杨兆中,杨苏,张健,等. 800 m以深直井煤储层压裂特征分析[J]. 煤炭学报,2016,41(1):100-104. YANG Zhaozhong,YANG Su,ZHANG Jian,et al. Fracturing characteristics analysis of 800 meters deeper coalbed methane vertical wells[J]. Journal of China Coal Society,2016,41(1):100-104.

[4] 陈刚,李五忠. 鄂尔多斯盆地深部煤层气吸附能力的影响因素及规律[J]. 天然气工业,2011,31(10):47-49. CHEN Gang,LI Wuzhong. Influencing factors and patterns of CBM adsorption capacity in deep Ordos basin[J]. Natural Gas Industry,2011,31(10):47-49.

[5] 秦勇,宋全友,傅雪海. 煤层气与常规油气共采可行性探讨:深部煤储层平衡水条件下的吸附效应[J]. 天然气与地球科学,2005,16(4):492-498. QIN Yong,SONG Quanyou,FU Xuehai. Discussion on reliability for co-mining the coalbed gas and normal petroleum and natural gas absorptive effect of deep coal reservoir under condition of balanced water[J]. Natural Gas Geoscience,2005,16(4):492-498.

[6] 李辛子,王运海,姜昭琛,等. 深部煤层气勘探开发进展与研究[J]. 煤炭学报,2016,41(1):24-31. LI Xinzi,WANG Yunhai,JIANG Zhaochen,et al. Progress and study on exploration and production for deep coalbed methane[J]. Journal of China Coal Society,2016,41(1):24-31.

[7] 杨兆中,韩金轩,付蔷,等. 煤储层不同尺寸孔中H2O对CH4 解吸扩散的分子模拟研究[J]. 天然气地球科学,2015,26(5):951-957. YANG Zhaozhong,HAN Jinxuan,FU Qiang,et al. The molecular simulation of the influence of H2O on CH4 desorption and diffusion in pores with different size of coal reservoirs[J]. Natural Gas Geoscience,2015,26(5):951-957.

[8] 张军涛,郭庆,汶锋刚. 深层煤层气压裂技术的研究与应用[J]. 延安大学学报(自然科学版),2015,34(1):78-80. ZHANG Juntao,GUO Qing,WEN Fenggang. Research and application of deep coalbed methane fracturing technology[J]. Journal of Yan'an University(Natural Science Edition),2015,34(1):78-80.

[9] 叶建平,张兵,韩学婷,等. 深煤层井组CO2 注入提高采收率关键参数模拟和试验[J]. 煤炭学报,2016,41(1):149-155. YE Jianping,ZHANG Bing,HAN Xueting,et al. Well group carbon dioxide injection for enhanced coalbed methane recovery and key parameter of the numerical simulation and application in deep coalbed methane[J]. Journal of China Coal Society,2016, 41(1):149-155.

[10] 申建,秦勇,张春杰,等. 沁水盆地深煤层注入CO2 提高煤层气采收率可行性分析[J]. 煤炭学报,2016,41(1):156-161. SHEN Jian,QIN Yong,ZHANG Chunjie,et al. Feasibility of enhanced coalbed methane recovery by CO2 sequestration into deep coalbed of Qinshui basin[J]. Journal of China Coal Society, 2016,41(1):156-161.

[11] 陈海汇,范洪富,郭建平,等. 煤层气井水力压裂液分析与展望[J]. 煤田地质与勘探,2017,45(5):33-40. CHEN Haihui,FAN Hongfu,GUO Jianping,et al. Analysis and prospect on hydraulic fracturing fluid used in coalbed methane well[J]. Coal Geology & Exploration,2017,45(5):33-40.

[12] 陈尚斌,朱炎铭,刘通义,等. 清洁压裂液对煤层气吸附性能的影响[J]. 煤炭学报,2009,34(1):89-93. CHEN Shangbin,ZHU Yanming,LIU Tongyi,et al. Impact of the clear fracturing fluid on the adsorption properties of CBM[J]. Journal of China Coal Society,2009,34(1):89-93.

[13] 王绪性,仲冠宇,郭布民,等. 沁水盆地南部3号煤压裂曲线特征及施工建议[J]. 煤田地质与勘探,2016,44(3):36-39. WANG Xuxing,ZHONG Guanyu,GUO Bumin,et al. Characteristic of fracturing curve of seam No.3 in south of Qinshui basin and suggestion about operation[J]. Coal Geology & Exploration,2016,44(3):36-39.

Share

COinS
 
 

To view the content in your browser, please download Adobe Reader or, alternately,
you may Download the file to your hard drive.

NOTE: The latest versions of Adobe Reader do not support viewing PDF files within Firefox on Mac OS and if you are using a modern (Intel) Mac, there is no official plugin for viewing PDF files within the browser window.