Movement of Pulverized Coal in Sucker Rod Pump in Coalbed Methane Well

doi:10.11885/j.issn.16745086.2014.10.31.05

Abstract

Abstract: Based on the solid-liquid two phase flows theory, the mathematical model of coal particles in sucker rod pump was built, and the motion law of coal particles in sucker rod pump was analyzed. Through the model and simulation analysis of the solid-liquid two phase flows in sucker rod pump, the influence of the parameters, including the diameter of coal particles, the inlet velocity of well fluid, and the concentration of coal particles in well fluid, on coal particles deposition in sucker rod pump was obtained. Based on the wearing character of solid particles in the space between pump barrel and plunger, the influence of coal particles on service life of sucker rod pump was analyzed and the measures to prolong the detection period and service life of pump was given. The results show that the concentration of coal particles in the bottom of pump is relatively big and the distribution is very uneven. In sucker rod pump, the velocity distribution of coal particles is uneven and the turbulence is obvious, with coal particles mainly depositing along the entrance of the standing valve. A smaller diameter of coal particles, bigger inlet velocity of well fluid, and smaller concentration of coal particles in well fluid can reduce coal particles deposition in sucker rod pump. In the process of production, a continuous, stable and slow depressurization can reduce the production of coal particles. The reasonable adjustment of stroke and rate of production system and improvement of inlet velocity by changing pump capacity can reduce the coal particles deposition in sucker rod pump, making the coal particles in sucker rod pump discharged into the annulus between pumping rod and tubing, and the influence of coal particles on the pump can be significantly reduced.

Key words: coalbed methane well, sucker rod pump, pulverized coal, initial velocity, service life

CLC Number:

TE132.2

MO Rihe, ZHANG Fenna, QI Yaoguang, HE Yongjie, ZHANG Guofu. Movement of Pulverized Coal in Sucker Rod Pump in Coalbed Methane Well[J]. 西南石油大学学报(自然科学版), 2016, 38(5): 143-150.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.16745086.2014.10.31.05

http://journal15.magtechjournal.com/Jwk_xnzk/EN/Y2016/V38/I5/143

References

[1] 万仁溥,罗英俊. 采油技术手册[M]. 北京:石油工业出版社, 1993:105-244.
[2] LIU Xinfu, QI Yaoguang, WU Jianjun, et al. An approach to the optimum design of sucker-rod pumping system[C]//International Conference On Information Engineering, 2010, 3:140-143.
[3] HIRSCHFELDT C M, RUIZ R. Selection criteria for artificial lift system based on the mechanical limits:Case study of Golfo San Jorge Basin[C]. SPE 124737, 2009.
[4] 齐俊林,郭方元,黄伟,等. 游梁式抽油机分析方法[J]. 石油学报, 2006, 27(6):116-124. QI Junlin, GUO Fangyuan, HUANG Wei, et al. Exact analysis on beam pumping unit[J]. Acta Petrolei Sinica, 2006, 27(6):116-124.
[5] 李琨,高宪文,仇治学,等. 有杆泵抽油系统井下工况诊断的物元分析方法[J]. 东北大学学报(自然科学版), 2013, 34(5):613-617. LI Kun, GAO Xianwen, QIU Zhixue, et al. Matterelement analysis method of downhole conditions diagnosis for suck rod pumping system[J]. Journal of Northeastern University(Natural Seienee),2013,34(5):613-617.
[6] 张宏录,刘海蓉. 中国页岩气排采工艺的技术现状及效果分析[J]. 天然气工业, 2012, 32(12):49-51. ZHANG Honglu,LIU Hairong. State of the art and effects of dewatering & recovery of shale gas in China[J]. Natural Gas Industry, 2012, 32(12):49-51.
[7] 敏政,王乐,邵翔宇. 泥沙颗粒直径及体积分数对高比转速离心泵的影响[J]. 兰州理工大学学报, 2009, 35(1):46-49. MIN Zheng, WANG Le, SHAO Xiangyu. Influence of silt particle diameter and volume fraction on centrifugal pumps with high specific speed[J]. Journal of Lanzhou University of Technology, 2009, 35(1):46-49.
[8] 李仁年,韩伟,刘胜,等. 小粒径固液两相流在螺旋离心泵内运动的数值分析[J]. 兰州理工大学学报, 2007, 33(1):55-58. LI Rennian,HAN Wei,LIU Sheng,et al. Numerical analysis of interior flow in screw centrifugal pump for liquidsolid two-phase medium with small size particles[J]. Journal of Lanzhou University of Technology, 2007, 33(1):55-58.
[9] 何伟强,李昳,张玉良,等. 固相体积分数对泵性能影响研究[J]. 浙江理工大学学报, 2010, 27(4):575-579. HE Weiqiang, LI Yi, ZHANG Yuliang, et al. Study on the influence of solid-phase volume fraction on performance of pump[J]. Journal of Zhejiang Sci-Tech University, 2010, 27(4):575-579.
[10] 朱祖超,崔宝玲,李昳,等. 双流道泵输送固液介质的水力性能及磨损试验研究[J]. 机械工程学报, 2009, 45(12):65-69. ZHU Zuchao, CUI Baoling, LI Yi, et al. Experimental study on hydraulic performance and wear of doublechannel pump delivering solid-liquid media[J]. Journal of Mechanical Engineering, 2009, 45(12):65-69.
[11] WEI X Y, LU Z R, WANG H Y, et al. The Discharge Characteristic Analysis and the Simulation of Axial Piston Pumps[J]. Advanced Materials Research, 2012, 490-495.
[12] 刘新福,吴建军,綦耀光,等. 煤层气井气体对有杆泵排采的影响[J]. 中国石油大学学报(自然科学版), 2011, 35(4):144-149. LIU Xinfu, WU Jianjun, QI Yaoguang, et al. Effect of gas on sucker rod pump for coalbed methane well[J]. Journal of China University of Petroleum, 2011, 35(4):144-149.
[13] MORSI S A, ALEXANDER A J. An investigation of particle trajectories in two-phase flow systems[J]. Fluid Mech, 1972, 55(2):193-208.
[14] 刘冰,杜继芸,綦耀光,等. 抽油机井杆管环空瞬态流场煤粉颗粒排出研究[J]. 中国石油大学学报(自然科学版), 2014, 38(1):117-123. LIU Bing, DU Jiyun, QI Yaoguang, et al. Research on coal particle carrying out in unsteady flow field of rod pumped well annulus[J]. Journal of China University of Petroleum, 2014, 38(1):117-123.
[15] 吴子牛. 计算流体力学基本原理[M]. 北京:科学出版社, 2001:15-52.
[16] 朱君,高源,王慧. 防冲距对抽油机井泵效的影响分析[J]. 油气田地面工程, 2009, 28(10):60-61. ZHU Jun, GAO Yuan, WANG Hui. Analysis of impingement distance the impact on pump efficiency of pumping unit well[J]. Oil-Gas Field Surface Engineering, 2009, 28(10):60-61.
[17] 张强,付云飞,袁智,等. 多相介质诱发柱塞泵内部磨损[J]. 科技导报2012, 30(6):44-47. ZHANG Qiang, FU Yunfei, YUAN Zhi, et al. Multimedium running induced piston pump erosion[J]. Science & Technology Review, 2012, 30(6):44-47.