Research on the fracture mechanics model of deep hole pre-splitting for forced caving

Authors

LI Jinhua, College of Architecture and Civil Engineering, Xi'an University of Science and Technology, Xi'an 710054, China
CHEN Wenxiao, College of Architecture and Civil Engineering, Xi'an University of Science and Technology, Xi'an 710054, ChinaFollow
SU Peili, College of Architecture and Civil Engineering, Xi'an University of Science and Technology, Xi'an 710054, China
DUAN Dong, College of Architecture and Civil Engineering, Xi'an University of Science and Technology, Xi'an 710054, China
SONG Yongjun, College of Architecture and Civil Engineering, Xi'an University of Science and Technology, Xi'an 710054, China

Abstract

Tight radius drilling technology based on high pressure water jet is an important technical means to realize low-cost and efficient development of oil and gas resources. According to the research and application of tight radius drilling technology based on high pressure water jet, the equipment buildup, drilling theory, technical process and application effect of three tight radius drilling technologies and equipments(i.e., forging milling and reaming hydraulic type, forging milling and reaming jet thrust type and casing window type) are summarized systematically, and the advantages, disadvantages and adaptability of different technologies are included. From the point of view of increasing production of coalbed methane wells, the tight radius drilling technology based on forging milling and reaming jet thrust type is a suitable technology and should be further studied, and the difficulties and solutions in the process of coal seam drilling and turning are put forward. Finally, in view of the bottleneck problems of the tight radius drilling technology and equipment in formation applicability, drilling efficiency, productivity increase and so on, and energy development demand under present new situation, specific development suggestions are proposed, including the tight radius drilling compound stimulation technology, the tight radius drilling of drilling rate-increasing and efficiency-enhancing technology, the tight radius drilling and screen completion integration technology, the automated, informatized and intelligent tight radius drilling technology.

Keywords

tight radius drilling, rotary multihole jet, status, prospect, coalbed methane

DOI

10.3969/j.issn.1001-1986.2020.06.029

Recommended Citation

LI Jinhua, CHEN Wenxiao, SU Peili, et al. (2020) "Research on the fracture mechanics model of deep hole pre-splitting for forced caving," Coal Geology & Exploration: Vol. 48: Iss. 6, Article 30.
DOI: 10.3969/j.issn.1001-1986.2020.06.029
Available at: https://cge.researchcommons.org/journal/vol48/iss6/30

Reference

[1] 赵峰,齐俊德,丁自伟. 华亭煤矿强矿压动力灾害防治技术分析[J]. 煤田地质与勘探,2015,43(6):75-79. ZHAO Feng,QI Junde,DING Ziwei. Control of dynamic disasters induced by strong mine pressure in Huating Mine[J]. Coal Geology & Exploration,2015,43(6):75-79.

[2] 黄森林. 浅埋煤层覆岩结构稳定性数值模拟研究[J]. 煤田地质与勘探,2007,35(3):25-28. HUANG Senlin. Study on stability of overburden stratum structure by numerical simulation for shallow coal seam[J]. Coal Geology & Exploration,2007,35(3):25-28.

[3] 郭卫彬,刘长友,吴锋锋,等. 坚硬顶板大采高工作面压架事故及支架阻力分析[J]. 煤炭学报,2014,39(7):1212-1219. GUO Weibin,LIU Changyou,WU Fengfeng,et al. Analyses of support crushing accidents and support working resistance in large mining height workface with hard roof[J]. Journal of China Coal Society,2014,39(7):1212-1219.

[4] 王开,康天合,李海涛,等. 坚硬顶板控制放顶方式及合理悬顶长度的研究[J]. 岩石力学与工程学报,2009,28(11):2320-2327. WANG Kai,KANG Tianhe,LI Haitao,et al. Study of control caving methods and reasonable hanging roof length on hard roof[J]. Chinese Journal of Rock Mechanics and Engineering, 2009,28(11):2320-2327.

[5] 于斌,刘长友,杨敬轩,等. 坚硬厚层顶板的破断失稳及其控制研究[J]. 中国矿业大学学报,2013,42(3):342-348. YU Bin,LIU Changyou,YANG Jingxuan,et al. Research on the fracture in stability and its control technique of hard and thick roof[J]. Journal of University of Mining & Technology,2013,42(3):342-348.

[6] 王汉军,黄风雷,张庆明. 岩石定向断裂爆破的力学分析及参数研究[J]. 煤炭学报,2003,28(4):399-402. WANG Hanjun,HUANG Fenglei,ZHANG Qingming. Mechanics effect analysis and parameters study on borehole directional fracture blasting[J]. Journal of China Coal Society, 2003,28(4):399-402.

[7] 左建平,孙运江,刘文岗,等. 浅埋大采高工作面顶板初次断裂爆破机理与力学分析[J]. 煤炭学报,2016,41(9):2165-2172. ZUO Jianping,SUN Yunjiang,LIU Wengang,et al. Mechanical analysis and blasting mechanism of main roof initial fracturing in shallow depth mining face with large cutting height[J]. Journal of China Coal Society,2016,41(9):2165-2172.

[8] 方新秋,郝宪杰,兰奕文. 坚硬薄基岩浅埋煤层合理强制放顶距的确定[J]. 岩石力学与工程学报,2010,29(2):388-393. FANG Xinqiu,HAO Xianjie,LAN Yiwen. Determination of reasonable forced caving interval in shallow-buried seam with hard and thin bedrock[J]. Chinese Journal of Rock Mechanics and Engineering,2010,29(2):388-393.

[9] 高木福. 坚硬顶板处理步距的数值模拟[J]. 辽宁工程技术大学学报,2006,25(5):649-651. GAO Mufu. Numerical simulation of hard roof processing step[J]. Journal of Liaoning Technical University,2006,25(5):649-651.

[10] 李金华,段东,岳鹏举,等. 坚硬顶板强制放顶断裂力学模型研究[J]. 煤田地质与勘探,2018,46(6):128-132. LI Jinhua,DUAN Dong,YUE Pengju,et al. Study on the fracture mechanics model of forced caving of hard roof[J]. Coal Geology & Exploration,2018,46(6):128-132.

[11] 张杰,侯忠杰. 浅埋煤层非坚硬顶板强制放顶实验研究[J]. 煤田地质与勘探,2005,33(2):15-17. ZHANG Jie,HOU Zhongjie. Experimental research on non-hard overhead caving in shallow buried coal seam[J]. Coal Geology & Exploration,2005,33(2):15-17.

[12] 张杰. 浅埋煤层顶板深孔预爆强制初放研究[J]. 采矿与安全工程学报,2012,29(3):339-343. ZHANG Jie. Study on forced roof caving to hard roof by deep-hole pre-blasting in shallow coal seam[J]. Journal of Mining & Safety Engineering,2012,29(3):339-343.

[13] 邓广哲,王世斌,黄炳香. 煤岩水压裂缝扩展行为特性研究[J]. 岩石力学与工程学报,2004,23(20):3489-3493. DENG Guangzhe,WANG Shibin,HUANG Bingxiang. Research on behavior character of crack development induced by hydraulic fracturing in coal-rockmass[J]. Chinese Journal of Rock Mechanics and Engineering,2004,23(20):3489-3493.

[14] 姜婷婷,张建华,黄刚. 煤岩水力压裂裂缝扩展形态试验研究[J]. 岩土力学,2018,39(10):3677-3684. JIANG Tingting,ZHANG Jianhua,HUANG Gang. Experimental study of fracture geometry during hydraulic fracturing in coal[J]. Rock and Soil Mechanics,2018,39(10):3677-3684.

[15] 康红普,冯彦军. 定向水力压裂工作面煤体应力监测及其演化规律[J]. 煤炭学报,2012,37(12):1953-1959. KANG Hongpu,FENG Yanjun. Monitoring of stress change in coal seam caused by directional hydraulic fracturing in working face with strong roof and its evolution[J]. Journal of China Coal Society,2012,37(12):1953-1959.

[16] 冯彦军,康红普. 定向水力压裂控制煤矿坚硬难垮顶板试验[J]. 岩石力学与工程学报,2012,31(6):1148-1155. FENG Yanjun,KANG Hongpu. Test on hard and stable roof control by means of directional hydraulic fracturing in coal mine[J]. Chinese Journal of Rock Mechanics and Engineering, 2012,31(6):1148-1155.

[17] 黄炳香,赵兴龙,陈树亮,等. 坚硬顶板水压致裂控制理论与成套技术[J]. 岩石力学与工程学报,2017,36(12):2954-2970. HUANG Bingxiang,ZHAO Xinglong,CHEN Shuliang,et al. Theory and technology of controlling hard roof with hydraulic fracturing in underground mining[J]. Chinese Journal of Rock Mechanics and Engineering,2017,36(12):2954-2970.

[18] 宫世文,张荪茗,孙震,等. 深孔预裂爆破强制放顶技术的应用[J]. 煤矿安全,2007,38(1):21-22. GONG Shiwen,ZHANG Sunming,SUN Zhen,et al. Application of forced caving technology in deep hole pre-splitting blasting[J]. Safety in Coal Mines,2007,38(1):21-22.

[19] 中国航空研究院. 应力强度因子手册增订版[M]. 北京:科学出版社,1993. Chinese Aeronautical Establishment. Stress intensity factor manual[M]. Beijing:Science Press,1993.

[20] 杨登峰,张凌凡,柴茂,等. 基于断裂力学的特厚煤层综放开采顶板破断规律研究[J]. 岩土力学,2016,37(7):2033-2039. YANG Dengfeng,ZHANG Lingfan,CHAI Mao,et al. Study of roof breaking law of fully mechanized top coal caving mining in ultra-thick coal seam based on fracture mechanics[J]. Rock and Soil Mechanics,2016,37(7):2033-2039.

[21] 于骁中. 岩石和混凝土断裂力学[M]. 长沙:中南工业大学出版社,1991. YU Xiaozhong. Fracture mechanics of rock and concrete[M]. Changsha:Central South University of Technology Press,1991.