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| Reducing bottom-hole differential pressure by hydraulic jet |
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ZHU Hai-yan1, DENG Jin-gen1, HE Yu-fa2, LI Bin3, XIE Yu-hong4, HUANG Kai-wen4, ZHAO Jing-ying1
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(1.State Key Laboratory of Petroleum Resource and Prospecting in China University of Petroleum, Beijing 102249, China;2.CNOOC Research Center, Beijing 100027, China;3.China Offshore Oil International Company Limited, Beijing 100010, China;4.Drilling Department of Zhanjiang Company, China National Offshore Oil Company Limited, Zhanjiang 524057, China)
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| Abstract: |
| 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. |
| Key words: jet jet pump differential pressure concentric jet pump jet pump joint jet pump bit hybrid grid |
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