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Experimental Study on the Long-term Stability of Shale Rock Wellbore Under High Hydraulic Pressure by Baoyun Zhao; Xiaoping Wang; Wei Huang; Tianzhu Huang; Yang Liu is a Earth and Planetary Sciences article available to read on EtoBox.

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Hydraulic pressure is one of the important factors influencing the stability of well rock. In this paper, the sleeve typed shale rock specimens were used to laboratory simulate the long-term stability of shale rock wellbore under hydro-mechanical coupled condition. Based on the analysis of triaxial tests data, the strength characteristic of the saturated shale specimens was first studied. The results show that the strength presents an exponential decreasing trend with increasing hydraulic pressure; 5 MPa hydraulic pressure resulted in the axial compressive strength declined by around 12.20% and about 17.78% fell under the hydraulic pressure of 10 MPa. The creep behavior of the shale was also analyzed in detail. It was found that 60% of the triaxial compression strength can easily lead to rupture of specimen under hydraulic pressure of 5 MPa, while more than 73% of the triaxial compression strength is needed under the same confining pressure without hydraulic pressure. The hydraulic pressure as well as its action time obviously affects the wellbore failure characteristics, which may lead to the damage area appearing pulverized, seriously reducing its mechanical properties. A new vis

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Author

Baoyun Zhao; Xiaoping Wang; Wei Huang; Tianzhu Huang; Yang Liu

Publisher

Springer Science and Business Media LLC

Published

2021

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)