WANG Jianli, CHEN Dongdong, JIA Bingyi. Practice of gas drainage by hydraulic fracturing of roof pectination boreholes in broken soft coal seam in Hancheng mining area[J]. COAL GEOLOGY & EXPLORATION, 2018, 46(4): 17-21. DOI: 10.3969/j.issn.1001-1986.2018.04.003
Citation: WANG Jianli, CHEN Dongdong, JIA Bingyi. Practice of gas drainage by hydraulic fracturing of roof pectination boreholes in broken soft coal seam in Hancheng mining area[J]. COAL GEOLOGY & EXPLORATION, 2018, 46(4): 17-21. DOI: 10.3969/j.issn.1001-1986.2018.04.003

Practice of gas drainage by hydraulic fracturing of roof pectination boreholes in broken soft coal seam in Hancheng mining area

Funds: 

Science and Technology Innovation Fund of Xi'an Research Institute of CCTEG(2016XAYZD10, 2016XAYZD05, 2017XAYZD19)

More Information
  • Received Date: January 14, 2018
  • Published Date: August 24, 2018
  • Broken soft coal seams with poor permeability develop in Hancheng mining area, drilling in the coal seams is difficult, the effect of gas extraction is poor. The hydraulic fracturing technology of pectination boreholes in roof combines the advantages of the two technologies of hydraulic fracturing and directional drilling, it is an effective technical way to solve the problem of gas drainage in broken soft coal seams of low permeability. In Wangfeng coal mine, a long borehole was drilled in the roof siltstone of No. 3 coal seam, and had a branches in coal seams, casing and packer seal were used, hydraulic fracturing engineering test was carried out in the way of integral fracturing. The total length of the borehole was 344 m, the effective fracturing length was 284 m, the accumulative water injection was 874.79 m3, and the maximum pump pressure was 9.4 MPa. After the test, the relevant parameters of borehole gas drainage were continuously monitored for 86 days, the concentration of gas drainage was 27%-51%, 42.11% on average, the pure amount of gas drainage was 8.25-21.41 m3/min, 17.02 m3/min on average, the total amount of gas drainage was about 210×104 m3 by roof long boreholes. Compared with conventional hydraulic punching technology, of gas drainage of 100 meter borehole through this technology increased by 11.48 times, it preliminarily proves the applicability of the technology in the field of enhanced gas drainage in broken soft coal seam.
  • [1]
    刘新民,王力,王建利,等. 韩城桑树坪二号井松软煤层钻进技术研究与实践[J]. 煤田地质与勘探,2017,45(3):165-169.

    LIU Xinmin,WANG Li,WANG Jianli,et al. Research and practices on drilling in soft coal seams in Hancheng Sangshuping coal mine[J]. Coal Geology & Exploration,2017,45(3):165-169.
    [2]
    李彬刚. 芦岭煤矿碎软低渗煤层高效抽采技术[J]. 煤田地质与勘探,2017,45(4):81-84.

    LI Bingang. Technology of CBM extraction in the crushed and soft coal seam in Luling coal mine[J]. Coal Geology & Exploration,2017,45(4):81-84.
    [3]
    史晓勇. 韩城矿区松软突出煤层瓦斯抽采技术研究[J].煤炭工程,2012(1):109-110.

    SHI Xiaoyong. Study on gas drainage technology of soft and outburst coal seam in Hancheng mining area[J]. Coal Engineering,2012(1):109-110.
    [4]
    袁亮,秦勇,程远平,等.我国煤层气矿井中-长期抽采规模情景预测[J]. 煤炭学报,2013,38(4):529-534.

    YUAN Liang,QIN Yong,CHENG Yuanping,et al. Scenario predication for medium-long term scale of coal mine methane drainage in China[J]. Journal of China Coal Society,2013, 38(4):529-534.
    [5]
    周斌,郝晋伟,张春华. 松软煤层瓦斯钻孔失稳分析及动态密封技术[J]. 煤田地质与勘探,2016,44(4):161-166.

    ZHOU Bin,HAO Jinwei,ZHANG Chunhua. Analysis on borehole instability under coupled multiple stress and dynamic sealing technology in soft coal seam[J]. Coal Geology & Exploration,2016,44(4):161-166.
    [6]
    李孜军,陈艳丽,朱壮观. 顺煤层瓦斯抽采钻孔封孔新工艺[J]. 煤田地质与勘探,2015,43(3):115-117.

    LI Zijun,CHEN Yanli,ZHU Zhuangguan. Hole sealing method of bedding gas drainage borehole[J]. Coal Geology & Exploration,2015,43(3):115-117.
    [7]
    张帆,马耕,刘晓,等. 煤岩起裂压力和水力压裂裂缝扩展机制实验研究[J]. 煤田地质与勘探,2017,45(6):84-89.

    ZHANG Fan,MA Geng,LIU Xiao,et al. Experimental study on initiation pressure and mechanism of fracture propagation of hydraulic fracturing in coal and rock mass[J]. Coal Geology & Exploration,2017,45(6):84-89.
    [8]
    王耀锋,何学秋,王恩元,等.水力化煤层增透技术研究进展及发展趋势[J].煤炭学报,2014,39(10):1945-1955.

    WANG Yaofeng,HE Xueqiu,WANG Enyuan,et al.Research progress and development tendency of the hydraulic technology for increasing the permeability of coal seams[J]. Journal of China Coal Society,2014,39(10):1945-1955.
    [9]
    孙炳兴,王兆丰,伍厚荣. 水力压裂增透技术在瓦斯抽采中的应用[J]. 煤炭科学技术,2010,38(11):78-80.

    SUN Bingxing,WANG Zhaofeng,WU Hourong. Hydraulic pressurized cracking and permeability improvement technology applied to gas drainage[J]. Coal Science and Technology,2010, 38(11):78-80.
    [10]
    闫志铭. 低透煤层井下长钻孔水力压裂增透技术[J]. 煤田地质与勘探,2017,45(3):45-48.

    YAN Zhiming. Hydraulic fracturing technology for permeability improvement through underground long borehole along coal seam[J]. Coal Geology & Exploration,2017,45(3):45-48.
    [11]
    姚宁平,张杰,张国亮,等. 晋城矿区井下梳状钻孔瓦斯抽采技术体系[J]. 煤炭科学技术,2015,43(2):88-91.

    YAO Ningping,ZHANG Jie,ZHANG Guoliang,et al. System of gas drainage technology of comb-like directional drilling in Jincheng mining area[J]. Coal Science and Technology,2015,43(2):88-91.
    [12]
    付江伟,王公忠,李鹏,等.顶板水力致裂抽采瓦斯技术研究[J]. 中国安全科学学报,2016,26(1):109-115.

    FU Jiangwei,WANG Gongzhong,LI Peng,et al. Research on technique for gas frainage based on roof hydraulic fracturing[J]. China Safety Science Journal,2016,26(1):109-115.
    [13]
    王生全,李树刚,王贵荣,等. 韩城矿区煤与瓦斯突出主控因素及突出区预测[J]. 煤田地质与勘探,2006,34(3):36-39.

    WANG Shengquan,LI Shugang,WANG Guirong,et al. Control factors of coal and gas outburst and regional prediction in Hancheng mining area,Shaanxi[J]. Coal Geology & Exploration, 2006,34(3):36-39.
    [14]
    姬新强,要惠芳,李伟.韩城矿区构造煤红外光谱特征研究[J]. 煤炭学报,2016,41(8):2050-2056.

    JI Xinqiang,YAO Huifang,LI Wei. FTIR spectroscopic study on tectonically deformed coals in Hancheng mining area[J]. Journal of China Coal Society,2016,41(8):2050-2056.
    [15]
    雷毅. 松软煤层井下水力压裂致裂机理及应用研究[D]. 北京:煤炭科学研究总院,2014.
    [16]
    刘大锰,周三栋,蔡益栋,等. 地应力对煤储层渗透性影响及其控制机理研究[J]. 煤炭科学技术,2017,45(6):1-8.

    LIU Dameng,ZHOU Sandong,CAI Yidong,et al. Study on effect of geo-stress on coal permeability and its controlling mechanism[J]. Coal Science and Technology,2017,45(6):1-8.
  • Related Articles

    [1]ZHOU Lang, MA Zhenqian, HUANG Qingrong, SHUAI Yunlin, ZHANG Jimin, LIU Rongke. A nanoindentation-based study on the micromechanical properties of red shales[J]. COAL GEOLOGY & EXPLORATION, 2024, 52(11): 96-107. DOI: 10.12363/issn.1001-1986.24.06.0370
    [2]OUYANG Zhenhua, LIU Yang, LI Chunlei, SHI Qingwen, LI Wenshuai, YI Haiyang, QIN Hongyan, ZHANG Ningbo. An experimental study of the evolutionary patterns of mechanical properties of coals under multiple mining disturbances[J]. COAL GEOLOGY & EXPLORATION, 2024, 52(10): 72-84. DOI: 10.12363/issn.1001-1986.24.04.0274
    [3]ZHAO Huanshuai, PAN Yongtai, QIAO Xin, WANG Xingyu, YU Chao, HUANG Jiacheng. Fracturing evolutionary law and energy utilization efficiency of green sandstones under different loading rates[J]. COAL GEOLOGY & EXPLORATION, 2024, 52(6): 69-78. DOI: 10.12363/issn.1001-1986.24.03.0152
    [4]ZHANG Heyong, WANG Xuedong, ZHU Yongdong, WANG Haipeng, QI Lihui. Mechanical properties and strength deterioration mechanism of soil in inner dump of open-pit coal mine under the action of freeze-thaw cycles[J]. COAL GEOLOGY & EXPLORATION.
    [5]ZHANG Heyong, WANG Xuedong, ZHU Yongdong, WANG Haipeng, QI Lihui. Mechanical properties and strength deterioration mechanism of soil in inner dump of open-pit coal mine under the action of freeze-thaw cycles[J]. COAL GEOLOGY & EXPLORATION, 2023, 51(11): 119-131. DOI: 10.12363/issn.1001-1986.23.04.0210
    [6]HU Xin, SUN Qiang, YAN Changgen, ZHAO Chunhu, WANG Shaofei. Deterioration characteristics of water-rock interaction on combustion metamorphic rocks in northern Shaanxi[J]. COAL GEOLOGY & EXPLORATION, 2023, 51(4): 76-84. DOI: 10.12363/issn.1001-1986.22.06.0496
    [7]ZHANG Yin, LI Zhe, SONG Shikang, ZHAO Yi, LI Hao. Mechanical properties and acoustic emission characteristics of sandstone under natural and saturated conditions[J]. COAL GEOLOGY & EXPLORATION, 2022, 50(2): 98-105. DOI: 10.12363/issn.1001-1986.21.06.0341
    [8]LI Qiang, WANG Yansen, WANG Chunlin, XU Shengji, FAN Zhiqiang. Performance deterioration law of retarded cement slurry and its mixed slurry in freezing borehole mud replacement[J]. COAL GEOLOGY & EXPLORATION, 2021, 49(5): 182-189. DOI: 10.3969/j.issn.1001-1986.2021.05.020
    [9]DENG Niandong, YAO Ting, SHANG Hui, LIU Donghai. Surface subsidence law caused by fully mechanized caving mining under railway[J]. COAL GEOLOGY & EXPLORATION, 2019, 47(6): 121-125,134. DOI: 10.3969/j.issn.1001-1986.2019.06.019
    [10]XU Shuanhai, TIAN Yanzhe, LI Ning. Variation of physical and mechanical characteristics of coarse sandstone during freezing and thawing cycles[J]. COAL GEOLOGY & EXPLORATION, 2016, 44(5): 102-107. DOI: 10.3969/j.issn.1001-1986.2016.05.019
  • Cited by

    Periodical cited type(3)

    1. 梁艳玲,霍润科,宋战平,穆彦虎,秋添,宋子羿. 基于矿物溶解理论的砂岩化学损伤动态模型. 材料导报. 2024(08): 163-169 .
    2. 龙钰,韩文梅,关学锋,何天明,杜龙飞,葛彦鑫. 酸性矿井水作用下砂岩冲击特性变化分析. 中北大学学报(自然科学版). 2022(05): 460-466 .
    3. 王腾飞,蔺文豪,秦哲,王彤彤. 不同水化学条件下循环侵水砂岩劣化规律研究. 地质与勘探. 2022(06): 1281-1290 .

    Other cited types(3)

Catalog

    Article Metrics

    Article views (167) PDF downloads (11) Cited by(6)
    Related

    /

    DownLoad:  Full-Size Img  PowerPoint
    Return
    Return