Reducing bottom-hole differential pressure by hydraulic jet

被引：5

作者：

Zhu, Hai-Yan ^{[1
]}

Deng, Jin-Gen ^{[1
]}

He, Yu-Fa ^{[2
]}

Li, Bin ^{[3
]}

Xie, Yu-Hong ^{[4
]}

Huang, Kai-Wen ^{[4
]}

Zhao, Jing-Ying ^{[1
]}

机构：

[1] State Key Laboratory of Petroleum Resource and Prospecting in China University of Petroleum

[2] CNOOC Research Center

[3] China Offshore Oil International Company Limited

[4] Drilling Department of Zhanjiang Company, China National Offshore Oil Company Limited

来源：

Zhongguo Shiyou Daxue Xuebao (Ziran Kexue Ban)/Journal of China University of Petroleum (Edition of Natural Science) | 2013年 / 37卷 / 02期

关键词：

Concentric jet pump; Differential pressure; Hybrid grid; Jet; Jet pump; Jet pump bit; Jet pump joint;

D O I：

10.3969/j.issn.1673-5005.2013.02.008

中图分类号：

学科分类号：

摘要：

Reducing the bottom-hole differential pressure (BHDP) and the cuttings hold-down effect can significantly improve the rate of penetration (ROP). Based on the jet hydraulic pressure drawdown theory, the current research and development situation of the jet hydraulic pressure drawdown tools including annular jet pump, jet pump joint and jet pump bit, a peripheral nozzle jet pump bit was designed. Using hybrid grid method, the key factors affecting the depressurization capacity of the bit were analyzed. The results show that the main reason of reducing the depressurization capacity of the jet pump bit is the backflow of the bottom-hole fluid. The backflow rate is in direct proportion to the bit clearance and in inverse proportion to the angle between the reverse nozzle axis and the bit axis. To seal the bit clearance is the key point to improving the performance of the jet pump bit. The new vortex and jet pump combination bit can reduce the BHDP about 0.45-0.88 MPa, which is 3-4 times the depressurization effect of existing jet pump bit.

引用

页码：50 / 56

页数：6

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