R&D and experimental research of pressure-preserved triggering device for horizontal pressure-preserved coring in coal mines

Authors

HUANG Wei, School of Mechanical Engineering, Sichuan University, Chengdu 610065, ChinaFollow
CHEN Ling, School of Mechanical Engineering, Sichuan University, Chengdu 610065, ChinaFollow
LI Jianan, College of Water Resource and Hydropower, Sichuan University, Chengdu 610065, China
FAN Dong, CCTEG Xi’an Research Institute (Group) Co., Ltd., Xi’an 710077, China
YANG Mingqing, College of Water Resource and Hydropower, Sichuan University, Chengdu 610065, China
LIU Guikang, College of Water Resource and Hydropower, Sichuan University, Chengdu 610065, China
XU Qing, Jin Shi Drill Tech Co., Ltd, Tangshan 063004, China
MA Changliang, Jin Shi Drill Tech Co., Ltd, Tangshan 063004, China

Abstract

Gas content is an important evaluation index of safe coal mining, as well as the exploitation and utilization of coalbed methane resources. Pressure-preserved coring is an effective way to improve the measurement accuracy of gas content in coal seams. Aiming at the special operating conditions of horizontal pressure-preserved coring in coal mines and based on the principle and technology of pressure- and gas-preserved coring in coal mines, this study developed a pressure-preserved triggering device and systematically designed the key components of the device, such as the sealing and pressure-preserved unit, the hydraulic drive module, and the salvager-unstuck mechanism between the spearhead and horizontal fisher. The purpose is to improve the recovery rate of pressure-preserved core samples. Furthermore, this study developed the ground test system for the performance of the pressure-preserved triggering device and conducted experimental research on the technological performance of the device using this system. As shown by the results, various function modules of the device operated stably, and the pressure-preserved controller successively turned over in five typical directions of the controller’s valve cover. Meanwhile, the wire rope was successively taken from the coring drill rod, effectively avoiding equipment failures caused by the winding of the wire rope when the corer was lifted from the borehole bottom to the borehole head. After the performance test, the pressure chamber of the corer was tested using an electric pressure test pump. The test results show that under the maximum pressure of 4.1 MPa, the pressure gauge readings remained stable, and the pressure fluids inside the pressure chamber did not leak, further indicating that the device can trigger the sealing and pressure-preserved functions of the corer. Finally, this study carried out an industrial test of the device under practical operating conditions of a coal mine. The results also show that the pressure-preserved triggering device can achieve the sealing and pressure-preserved functions of the corer stably under the actual working conditions of coal seams, with a coal sample recovery rate of up to 90%. The results of this study can promote the development of horizontal pressure coring technology for coal mines and are of great significance for the accurate determination of gas content in the coal seam.

Keywords

horizontal well, pressure-preserved coring, pressure-preserved triggering device, experimental study, coal mine

DOI

10.12363/issn.1001-1986.22.12.0933

Recommended Citation

HUANG Wei, CHEN Ling, LI Jianan, et al. (2023) "R&D and experimental research of pressure-preserved triggering device for horizontal pressure-preserved coring in coal mines," Coal Geology & Exploration: Vol. 51: Iss. 8, Article 6.
DOI: 10.12363/issn.1001-1986.22.12.0933
Available at: https://cge.researchcommons.org/journal/vol51/iss8/6

Reference

[1] 谢和平,钱鸣高,彭苏萍,等. 煤炭科学产能及发展战略初探[J]. 中国工程科学,2011,13(6):44−50.

XIE Heping,QIAN Minggao,PENG Suping,et al. Sustainable capacity of coal mining and its strategic plan[J]. Strategic Study of CAE,2011,13(6):44−50.

[2] 谢和平,高明忠,张茹,等. 深部岩石原位“五保”取芯构想与研究进展[J]. 岩石力学与工程学报,2020,39(5):865−876.

XIE Heping,GAO Mingzhong,ZHANG Ru,et al. Study on concept and progress of in situ fidelity coring of deep rocks[J]. Chinese Journal of Rock Mechanics and Engineering,2020,39(5):865−876.

[3] 高明忠,刘军军,林文明,等. 特厚煤层超前采动原位应力演化规律研究[J]. 煤炭科学技术,2020,48(2):28−35.

GAO Mingzhong,LIU Junjun,LIN Wenming,et al. Study on in–situ stress evolution law of ultra–thick coal seam in advance mining[J]. Coal Science and Technology,2020,48(2):28−35.

[4] HUANG Wei,FENG Gan,HE Huilan,et al. Development of an ultra–high–pressure rotary combined dynamic seal and experimental study on its sealing performance in deep energy mining conditions[J]. Petroleum Science,2022,19:1305−1321.

[5] 高明忠,陈领,凡东,等. 深部煤矿原位保压保瓦斯取芯原理与技术探索[J]. 煤炭学报,2021,46(3):885−897.

GAO Mingzhong,CHEN Ling,FAN Dong,et al. Principle and technology of coring with in–situ pressure and gas maintaining in deep coal mine[J]. Journal of China Coal Society,2021,46(3):885−897.

[6] 谢和平. 深部岩体力学与开采理论研究进展[J]. 煤炭学报,2019,44(5):1283−1305.

XIE Heping. Research review of the state key research development program of China:Deep rock mechanics and mining theory[J]. Journal of China Coal Society,2019,44(5):1283−1305.

[7] 王恩元,张国锐,张超林,等. 我国煤与瓦斯突出防治理论技术研究进展与展望[J]. 煤炭学报,2022,47(1):297−322.

WANG Enyuan,ZHANG Guorui,ZHANG Chaolin,et al. Research progress and prospect on theory and technology for coal and gas outburst control and protection in China[J]. Journal of China Coal Society,2022,47(1):297−322.

[8] 任浩洋,王兆丰. 测定瓦斯含量取样方式存在问题分析及解决对策[J]. 煤矿安全,2015,46(4):148−151.

REN Haoyang,WANG Zhaofeng. Problem analysis and solutions about sampling way of gas content determination[J]. Safety in Coal Mines,2015,46(4):148−151.

[9] WANG Fakai,ZHAO Xusheng,LIANG Yunpei,et al. Calculation model and rapid estimation method for coal seam gas content[J]. Processes,2018,6(11):223.

[10] SAGHAFI A. Discussion on determination of gas content of coal and uncertainties of measurement[J]. International Journal of Mining Science and Technology,2017,27(5):741−748.

[11] 张振飞. 煤层瓦斯含量测定方法对比研究[D]. 淮南：安徽理工大学，2013.

ZHANG Zhenfei. Comparative study on the coal seam gas content assay method[D]. Huainan：Anhui University of Science & Technology，2013.

[12] 张群,冯三利,杨锡禄. 试论我国煤层气的基本储层特点及开发策略[J]. 煤炭学报,2001,26(3):230−235.

ZHANG Qun,FENG Sanli,YANG Xilu. Basic reservoir characteristics and development strategy of coalbed methane resource in China[J]. Journal of China Coal Society,2001,26(3):230−235.

[13] 胡千庭,邹银辉,文光才,等. 瓦斯含量法预测突出危险新技术[J]. 煤炭学报,2007,32(3):276−280.

HU Qianting,ZOU Yinhui,WEN Guangcai,et al. New technology of outburst danger prediction by gas content[J]. Journal of China Coal Society,2007,32(3):276−280.

[14] 贵宏伟,李学臣,郭艳飞,等. 千米钻机超深钻孔定点密闭取芯技术研究与应用[J]. 煤炭工程,2018,50(12):54−57.

GUI Hongwei,LI Xuechen,GUO Yanfei,et al. Research and application of fixed–point closed sampling technology for super deep drilling in 1000m drilling machine[J]. Coal Engineering,2018,50(12):54−57.

[15] 秦玉金. 地勘期间煤层瓦斯含量测定方法存在问题及对策分析[J]. 煤矿安全,2011,42(8):144−146.

QIN Yujin. Problems and countermeasures of coal seam gas content determination method during geological prospecting[J]. Safety in Coal Mines,2011,42(8):144−146.

[16] 陈绍杰,徐阿猛,陈学习,等. 反转密封取样装置[J]. 煤矿安全,2012,43(10):94−96.

CHEN Shaojie,XU Ameng,CHEN Xuexi,et al. Inversion seal sampling device[J]. Safety in Coal Mines,2012,43(10):94−96.

[17] 景兴鹏. 机械密闭取芯瓦斯含量测定集成技术研究[J]. 中国安全生产科学技术,2015,11(11):59−63.

JING Xingpeng. Study on integrate technique of mechanical sealed coring and methane content measuring[J]. Journal of Safety Science and Technology,2015,11(11):59−63.

[18] 齐黎明. 卸压密闭煤层瓦斯含量测定技术研究[D]. 北京：中国地质大学 (北京)，2011.

QI Liming. Research on the measuring gas content technology of stress−releasing and sealed coal core[D]. Beijing：China University of Geosciences (Beijing)，2011.

[19] 龙威成,孙四清,陈建. 碎软煤层井下长距离定点密闭取心技术研究[J]. 煤田地质与勘探,2022,50(8):93−98.

LONG Weicheng,SUN Siqing,CHEN Jian. Study on long–distance fixed–point sealed coring technology in broken–soft coal seam[J]. Coal Geology & Exploration,2022,50(8):93−98.

[20] 孙四清,张群,郑凯歌,等. 地面井煤层气含量精准测试密闭取心技术及设备[J]. 煤炭学报,2020,45(7):2523−2530.

SUN Siqing,ZHANG Qun,ZHENG Kaige,et al. Technology and equipment of sealed coring for accurate determination of coalbed gas content in ground well[J]. Journal of China Coal Society,2020,45(7):2523−2530.

[21] 龙威成,孙四清. 煤层气含量测定用绳索密闭取心装置及技术研究[J]. 煤田地质与勘探,2021,49(3):133−139.

LONG Weicheng,SUN Siqing. Research on wireline sealed coring equipment and technology for coalbed methane content determination[J]. Coal Geology & Exploration,2021,49(3):133−139.

[22] 孙四清,张群,龙威成,等. 煤矿井下长钻孔煤层瓦斯含量精准测试技术及装置[J]. 煤田地质与勘探,2019,47(4):1−5.

SUN Siqing,ZHANG Qun,LONG Weicheng,et al. Accurate test technology and device for coal seam gas content in long boreholes in underground coal mines[J]. Coal Geology & Exploration,2019,47(4):1−5.

[23] 成大先. 机械设计手册[M]. 北京：化学工业出版社，2016.