Initiation and extension of gas-driven fracture during compound perforation

Li Hai-tao; Luo Wei; Jiang Yu-sheng; Zhang Jun-song

doi:10.11883/1001-1455(2014)03-0307-08

Volume 34 Issue 3

Aug. 2014

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Li Hai-tao, Luo Wei, Jiang Yu-sheng, Zhang Jun-song. Initiation and extension of gas-driven fracture during compound perforation[J]. Explosion And Shock Waves, 2014, 34(3): 307-314. doi: 10.11883/1001-1455(2014)03-0307-08

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Li Hai-tao, Luo Wei, Jiang Yu-sheng, Zhang Jun-song. Initiation and extension of gas-driven fracture during compound perforation[J]. Explosion And Shock Waves, 2014, 34(3): 307-314. doi: 10.11883/1001-1455(2014)03-0307-08

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Initiation and extension of gas-driven fracture during compound perforation

doi: 10.11883/1001-1455(2014)03-0307-08

1.
State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, Sichuan, China
2.
CNOOC Energy Technology-Drilling & Production Co, Tianjin 300452, China
3.
Downhole Service Branch of Southwest Petroleum Engineering Company, Sinopec Corp, Deyang 618000, Sichuan, China

Received Date: 2012-11-13
Publish Date: 2014-05-25

Abstract

Abstract

Combined with the crack tip stress intensity factor criterion of linear elastic fracture mechanics, the model of initiation and extension of gas-driven fractures by compound perforation is established.A function with multiple variables describing gas pressure distribution in crack is proposed herein to realize the numerical resolution of the model using the iteration method, and the dynamic change law of gas pressure distribution in fracture with time is obtained.In addition, the effect of different characteristic parameters on the process of fracture initiation and extension as well as fracture arrest is analyzed.The example calculation shows: (1)with the progress of fracture extension, the leading edge of the flow and the fracture tip will experience the process from coincidence to noncoincidence and then to coincidence; (2)the fracture initiation and extension are more difficult as in-situ stress is greater, which makes the effective time of gas-driven and the fracture shorter; (3)the fracture initiation and extension are easier and the utilization of gas energy is higher as the initial crack is longer, resulting in the longer crack; (4)the change of fracture toughness has no obvious influence on the crack initiation and extension as well as the fracture arrest; (5)both the effective time of gas-driven and the fracture are longer as the rate of pressure rise is smaller, but its change has nearly no impact on the pressure of the fracture initiation and arrest.
- mechanices of explosion,
- fracture initiation and extension,
- numerical coupled solution,
- compound perforation,
- gas pressure distribution in fracture,
- fracture arrest

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References(16)

References

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