SPH-based numerical simulation and experimental study on rock breaking by particle impact

被引：0
|
作者：
Zhao J. [1 ,2 ]
Zhang G. [1 ,2 ]
Xu Y. [1 ]
Zhou Y. [1 ]
Wang R. [1 ]
Xing X. [1 ]
Li J. [3 ]
机构：
[1] College of Petroleum Engineering, China University of Petroleum, Qingdao, 266580, Shandong
[2] Academy of Science and Technology, China University of Petroleum, Dongying, 257061, Shandong
[3] CNOOC EnerTech-Safety and Environmental Protection Co., Tianjin
来源：
| 1600年 / Explosion and Shock Waves卷 / 37期
关键词：
Indoor experiment; Particle jet; Rock breaking by impact; SPH method;
D O I：
10.11883/1001-1455(2017)03-0479-08
中图分类号：
学科分类号：
摘要：
Added into the drilling fluid in a volume portion of 1% to 3%, particles are capable of striking the rock with a high velocity after erupting from the bit nozzle and breaking the rock by particle impact combined with the mechanical action of the bit nozzle, thus greatly increasing the rock breaking efficiency. Using the transient nonlinear dynamics finite element simulation software and considering the influence of water jet, we established the physical model of rock breaking by particle impact based on the smoothed particle hydrodynamics (SPH) method, investigated the influence of the particle jet's parameters on the rock breaking volume, and verified the simulation results by comparing them with those of the indoors experiment which could verify the effectiveness of the SPH simulation method. Our results show that a regulation V-shaped crater is formed by the particle jet impact; the rock breaking volume resulting from this particle jet impact is 2 to 4 times that of the volume from the water jet under identical conditions. The rock breaking volume increases over time, but in the meantime the rock breaking efficiency decreases. When the pressure of the particle jet is above 10 MPa, there is a great increase of the rock breaking efficiency. When the jet angle is above 6°, there is a quick decrease of the rock breaking efficiency. © 2017, Editorial Board of EXPLOSION AND SHOCK WAVES. All right reserved.
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页码：479 / 486
页数：7
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