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中南大学学报(自然科学版)

Journal of Central South University

第49卷    第5期    总第285期    2018年5月

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文章编号:1672-7207(2018)05-1228-09
固液两相流粒子冲蚀钻头内流道磨损
赵健1, 2,张贵才1, 2,徐依吉1,王瑞和1,周卫东1,韩烈祥3

(1. 中国石油大学(华东) 石油工程学院,山东 青岛,266580; 2. 中国石油大学(华东) 科学技术研究院,山东 东营,257061; 3. 中国石油集团川庆钻探工程有限公司 钻采工程技术研究院,四川 德阳,618300)

摘 要: 针对固液两相流粒子冲蚀钻头内流道磨损机制,应用固液两相流离散相模型(discrete phase model,DPM),建立钻头内流道冲蚀磨损的物理模型,获得粒子参数对内流道磨损的影响规律,并进行室内实验,验证DPM模型的有效性。研究结果表明:粒子对钻头内流道冲蚀磨损主要分布在内流道收缩面,越靠近钻头中心轴线,磨损率越大;随粒子入口速度的增大,内流道平均磨损率增大;随粒子直径的增大,内流道平均磨损率先减小后增大,最后趋于稳定,当直径为2.0 mm时平均磨损率最小;随粒子体积分数的增大,内流道平均磨损率近似呈直线增加;当粒子入口角度为50°时,内流道平均磨损率最大;压力对于内流道磨损影响较小;进行100 h磨损实验后,钻头内流道的磨损率减小了0.80%。

 

关键词: 固液两相流;内流道磨损;离散相模型;粒子参数;钻头

Bit internal flow passage erosion by solid-liquid two-phase flow impact of particles
ZHAO Jian1, 2, ZHANG Guicai1, 2, XU Yiji1, WANG Ruihe1, ZHOU Weidong1, HAN Liexiang3

1. College of Petroleum Engineering, China University of Petroleum, Qingdao 266580, China; 2. Academy of Science and Technology, China University of Petroleum, Dongying 257061, China; 3. Drilling & Production Engineering Technology Research Institute, Chuanqing Drilling Engineering Co. Ltd., CNPC, Deyang 618300, China

Abstract:In order to identity the mechanism of bit internal flow passage erosion by solid-liquid two-phase flow impact of particles, the discrete phase model (DPM) was applied to establish the physical model of bit internal flow passage erosion, and the effects of particle parameters on the bit internal flow passage erosion were obtained. Furthermore, the indoor experiments were carried on to verify the validity of the DPM model. The results show that the bit internal flow passage erosion of particles mainly distributes on the contraction surface of bit internal flow passage, and the closer to the bit center axis, the higher the erosion rate is. The average erosion rate of the internal flow passage increases with the increase of the inlet velocity of particles. As the particle diameter increases, the average erosion rate of the internal flow passage decreases first and starts to increases, and then tends to be stable. The minimum average erosion rate is obtained with a particle diameter of 2.0 mm. Furthermore, the average erosion rate of the internal flow passage increases linearly with an increase of the particle volume fraction. When the inlet angle is 50°, the maximum average erosion rate of the internal flow passage appears. In addition, the average erosion rate of the internal has been less affected by the pressure. The erosion loss of the internal flow passage decreases by 0.80% after 100 h erosion experiment.

 

Key words: solid-liquid two-phase flow; bit internal flow passage erosion; discrete phase model (DPM); particle parameters; drilling bit

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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