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| Field-scale testing of hydraulic isolation in wellbore during hydra-jet fracturing |
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FAN Xin1, LI Gensheng1, HUANG Zhongwei1, NIU Jilei2, SONG Xianzhi1, SHENG Mao1
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(1.State Key Laboratory of Petroleum Resources and Prospecting in China University of Petroleum, Beijing 102249, China;2.Laboratory of High Pressure Water Jet in China University of Petroleum, Dongying 257061, China)
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| Abstract: |
| Hydraulic isolation can be used to isolate the wellbore sections during multiple hydra-jet fracturing. A field-scale testing on the hydraulic isolation was conducted to evaluate its isolation efficiency based on annulus pressure measurement. In the testing, the effects of jet velocity, ambient pressure, diameter of nozzle and perforation inlet, and annulus injection on isolation efficiency were investigated. The results show that the jet velocity and ambient pressure are the two key parameters to affect the annulus pressure drop-down, and it has a linear relationship with the jet velocity and an exponential relationship with the ambient pressure. In addition, the hydraulic isolation efficiency is directly proportional to the ratio of kinetic energy of the jet to the diameter of perforation inlet. Therefore, the isolation efficiency can be improved by enlarging the nozzle diameter or reducing the perforation inlet diameter, while the annulus injection can reduce the hydraulic isolation efficiency. |
| Key words: hydra-jet multistage fracturing hydraulic isolation annulus pressure |
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