Research article of American Journal of Scientific Research and Essays
Force and Control Measures of Pulverized Coal Migration in Coalbe-d Methane Horizontal Wells
ZHANG Beibei1, SHEN Junping2, ZHANG Jin3*, SHEN Shuxing4, ZHANG Mingshan5
1School of Earth Science and Engineering, HUE, School of Hebei University of Engineering, Handan 0560382, China; 2Aksu Industrial Vocational and Technical College, Aksu, 842000, China; 3College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou 225009, China; 4 Aksu No. 17 Middle School, Aksu, 843000; 5Zhengzhou Zhencheng Energy Technology Service Co., Ltd., Zhengzhou 450018, China.
Pulverized coal production is a common problem in the process of coalbed methane drainage and production, which is one of the key factors restricting the continuous stability drainage and production of coalbed methane. The reasons and characteristics of pulverized coal output are summarized. Through a detailed analysis of the migration and stress of pulverized coal in the borehole, the migration of pulverized coal is controlled by the stress conditions of pulverized coal, which causes the migration position of pulverized coal to change. Under the action of total pressure difference ΔF, pulverized coal particles can be divided into three situations: downward inclination, upward inclination and near horizontal migration. Finally, a solution to the control of pulverized coal is put forward from two aspects: the control of drainage and mining system and the selection of drainage and mining equipment. The research shows that continuous stability drainage and mining is the key of drainage and mining system, and controlling the hydrodynamic difference ΔF is the means to control the migration of pulverized coal. Choosing a pump with strong adaptability to pulverized coal is beneficial to coalbed methane drainage and production and increase productivity. Two horizontal wells in Shizhuang South Area 2 were replaced by membrane pumps, and the diaphragm pump system guide cover scheme was adopted. The coalbed methane production increased by about 1000m3/d, and the number of well repair was significantly reduced.
Keywords: pulverized coal; migration; stress; control
How to cite this article:
ZHANG Beibei, SHEN Junping, ZHANG Jin, SHEN Shuxing, ZHANG Mingshan. Force and Con- trol Measures of Pulverized Coal Migration in Coalbe-d Methane Horizontal Wells. American Journal of Scientific Research and Essays, 2022; 7:5. DOI:10.28933/ajsre-2022-10-2505
References:
[1]. YANG Y, Cui S Q, Ni Y Y, et al. Key technology for treating slack coal blockage in CBM recovery: A case study from multi-lateral horizontal wells in the Qinshui Basin[J].. Natural Gas Industry, 2016(1): 89-93.
[2]. Xu Y Y. Comparative Analysis of Coalbed Methane Water and Mine Water Quality-Taking Qinshui Basin as an Example[J].. Petrochemical Industry Technology, 2022, 29(06): 153-155.
[3]. HAN G Q, LING K G, WU H X, et al. An experimental study of coal-fines migration in coalbed-methane production wells[J].. Journal of Natural Gas Science and Engineering, 2015, 26: 1542-1548.
[4]. Wang C F, Shao X J, Sun Y B, et al. Production decline types and their control factors in coalbed methane wells: a case from Jincheng and Hancheng mining areas[J].. Coal Geology & Exploration, 2013, 41(3): 23-28.
[5]. Xu Y F, Yan C, Lin C P, et al. Research progress and development direction of key technologies for efficient coalbed methane development in China[J].. Coal Geology & Exploration, 2022, 50(03): 1-14.
[6]. Zhang X M, Feng Q H, Zhang J Y, et al. Establishment and application of material balance equations for coalbed methane reservoirs considering adsorption hysteresis effect[J].. Journal of China Coal Society, 2017, 42(10): 2662-2669.
[7]. Yan Z H, Hu H Y, Lou Y, et al. Research on CBM drilling and completion technology of complicated strata in Jinjia Mining Area of Guizhou Province[J].. Safety in Coal Mines, 2022, 53(06): 83-88.
[8]. Zhang S A, Cao L H, Du C X, et al. Study on CBM production mechanism and control theory of bottom-hole pressure and coal fines during CBM well production[J].. Journal of China Coal Society, 2014, 39(09): 1927-1931.
[9]. Wei Y C, Li C, Dao Y , et al. Experiment on screening dispersants of pulverized coal with different sizes in CBM well-washing technology[J].. Journal of China Coal Society, 2017, 42(11): 2908-2913.
[10]. YANG Y H, TANG D Z, YANG Y L, et al. Influence on velocity sensitivity effect of coal reservoir to production law of pulverized coal and gas productivity[J].. Coal Science and Technology, 2015, 43(2): 96-99.
[11]. Wei Y C, Li C, Zhang D Y, et al. The output mechanism and control measures of the pulverized coal in coalbed methane development[J].. Coal Geology & Exploration, 2018, 46(02): 68-73.
[12]. Sang S X, Hang S J, Liu S Q, et al. Comprehensive study on the enrichment mechanism of coalbed methane in high rank coal reservoirs[J].. Journal of China Coal Society, 2022, 47(01): 388-403.
[13]. Peng T. Gas collection technology for coalbed methane well site[J].. Safety in Coal Mines, 2021, 52(04): 125-128.
[14]. Zhao J F, Wang S W, Qing Y, et al. Characteristics and Origin of Coal Powder in Coalbed Methane Well[J].. Natural Gas Geoscience, 2013, 24(06): 1316-1320.
[15].Li Q Z, Ni X M, Hu H Y. Influence of fracturing scale of CBM vertical well on typical indexes of drainage and mining[J].. Safety in Coal Mines, 2021, 52(05):182-187.
[16]. Cao L H, Zhang S A, Zhang Y L, et al. Investigation of coal powder generation and migration characteristics in coalbed methane horizontal well[J].. Coal Geology & Exploration, 2014, 42(03):31-35.
[17]. Gong M, Zhang Y, Wang Y, et al. Numerical Simulation and Analysis of Pipe Flow in CBM T-Pipeline With Pulverized Coal[J].. Contemporary Chemical Industry, 2016, 45(01): 112-114.
[18]. Mei Y G, Guo J, Shu L, et al. Appfication of rodless pump drainage technology to Qinshui Coalbed Methane Field[J].. Coal Science and Technology, 2016, 44(05): 64-67.
[19]. Yan Y W, Li G Z, Liu K, et al. Application of Hydraulic Drive Rodless Pump Drainage Gas Production Technology in Bao-Ping 10 Horizontal Multilateral Well[J].. Oil Field Equipment, 2021, 50(04):61-65.
[20]. Wang H, Bai L J. Control strategy of voltage fluctuations in DC microgrid consisting the rod pump drainage equipment in coalbed methane well[J].. Journal of Henan Polytechnic University(Natural Science), 2019, 38(05): 99-104.
[21]. Gong Y W, Liu K W, Bai Y, et al. Study on optimization of coalbed methane drainage equipment in Binchang Mining Area[J].. Coal Science and Technology, 2019, 47(12): 156-160.
[22]. Jiang Y P, Yang S. New technology of dewatering gas recovery for CBM wells in southern Yanchuan Block, eastern margin of Ordos Basin[J].. Petroleum Reservoir Evaluation and Development, 2021, 11(03): 384-389.
[23]. Qing Y, SHEN J, LI X G. Control degree and reliability of CBM resources in China[J].. Natural Gas Industry, 2022, 42(06): 19-32.
[24]. Liu S Q, Fang H H, Sang S X, et al. Numerical simulation of gas production for multilayer drainage coalbed methane vertical wells in southern Qinshui Basin[J].. Coal Geology & Exploration, 2022, 50(06): 20-31.
Terms of Use/Privacy Policy/ Disclaimer/ Other Policies:
You agree that by using our site/services, you have read, understood, and agreed to be bound by all of our terms of use/privacy policy/ disclaimer/ other policies (click here for details).
CC BY 4.0
This work and its PDF file(s) are licensed under a Creative Commons Attribution 4.0 International License.