The Effects of Pore Pressure and Temperature Difference Variation on Borehole Stability

AI Chi, LI Yuwei, LIU Yu


Considering that drilling fluid filtration and the temperature difference between borehole wall rock and drilling fluid can cause the stress variation of the borehole wall. The stress distribution model was derived under the effect of thermal-flow-solid coupling. The safe mud density window calculating model considering pore pressure and temperature difference variation was established according to Moore-Coulomb criterion and borehole wall rock tensile failure criterion. The result calculated by the model can be expressed as follow. (1) When the temperature difference between borehole rock and drilling fluid is constant, with the enhancement of fluid filtration, borehole rock pore pressure increasing, the collapse pressure increasing, breakdown pressure decreasing, the stability of the borehole becomes deteriorating. (2) When the borehole wall rock pore pressure is constant, if drilling fluid makes wall rock temperature decreasing, with the temperature difference increasing, both the collapse pressure and breakdown pressure decreasing, the stability of the borehole becoming deteriorating, it is not conducive to drilling safely. If drilling fluid make wall rock temperature increasing, with the temperature difference increasing, both the collapse pressure and breakdown pressure increasing, the borehole tending to stabilize, it is conducive to drilling safely.
Key words: Pore pressure; Temperature difference; Borehole stability; Safe mud density window


Pore pressure; Temperature difference; Borehole stability; Safe mud density window

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[1] Aadnow, B. S., Rogaland, U., & Chenevert, M.E. (1987). Stability of Highly Inclined Boreholes. SPE 16052.

[2] Yew, C. H. (1989). On Fracturing Design of a Deviated Wells. SPE 19722.

[3] Jia, G. Y., Zhang, L. S., & Duan, Y. X. (2006). Drilling in High Density and Thin Pressure Windows Complex Formation. SPE 104411.

[4] Wang, Q., Zhou, Y. C., Wang, G., et al. (2012). The Flow-Solid-Thermal Coupling Model for Shale Borehole Stability. Petroleum Exploration and Development, 39(4), 475-480.

[5] Li, Y. F., Fu, Y. Q., Tang, G., et al. (2012). The Regulations of Stress Type Affecting Borehole Stability for Directional Wells. Natural Gas Industry, 32(3), 78-80.

[6] Li, H. F., & Chen, M. (2011). Real-Time Prediction of Borehole Instability Based on Actual Drilling Data. Acta Petrolei Sinica, 32(2), 324-328.

[7] Wang, X. L., Cheng, Y. F., & Zhao, Y. Z. (2007). The Effect of Temperature on Wellbore Stability in Shale During Drilling. Petroleum Drilling Techniques, 35(2), 42-45.

[8] Wei, B. H., Lu, X. F., Wang, B. Y., et al. (2004). The Effect of Formation Temperature Variation on Wellbore Stability in High Temperature Wells. Drilling Fluid and Completion Fluid, 21(6), 15-18.

[9] Zhang, L. W., Qiu, D. H., & Cheng, Y. F. (2009). Research on the Wellbore Stability Model Coupled Mechanics and Chemistry. Journal of Shandong University (Engineering Science), 39(3), 111-114.

[10] Chen, M., Jin, Y., & Zhang, G. Q. (2008). Petroleum Engineering Rock Mechanics (pp. 62-65). Beijing: Science Press.



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