Advancements and Considerations of Chemo-Mechanical Coupling for Wellbore Stability in Deep Hard Brittle Shale

JIN Yan; BO Kehao; ZHANG Yazhou; LU Yunhu

doi:10.11911/syztjs.2023024

Volume 51 Issue 4

Aug. 2023

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Petroleum Drilling Techniques > 2023 > 51(4): 159-169. > DOI: 10.11911/syztjs.2023024

JIN Yan, BO Kehao, ZHANG Yazhou, et al. Advancements and considerations of chemo-mechanical coupling for wellbore stability in deep hard brittle shale [J]. Petroleum Drilling Techniques，2023, 51(4)：159-169. DOI: 10.11911/syztjs.2023024

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Advancements and Considerations of Chemo-Mechanical Coupling for Wellbore Stability in Deep Hard Brittle Shale

JIN Yan^{1, 2,},
BO Kehao^{1, 2},
ZHANG Yazhou^{1, 2},
LU Yunhu^{1, 2}

1.
College of Petroleum Engineering, China University of Petroleum (Beijing), Beijing, 102249, China
2.
State Key Laboratory of Petroleum Resources and Prospecting (China University of Petroleum (Beijing)), Beijing, 102249, China

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Received Date: December 18, 2022
Revised Date: February 12, 2023
Available Online: February 23, 2023

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Abstract

The oil and gas resources from deep and ultra-deep reservoirs in China are the most important target of exploration and development. However, pervasive and ubiquitous wellbore instability in hard brittle deep shale seriously compromises the efficient development of deep and ultra-deep oil and gas resources. Wellbore instability in deep hard brittle shale under the chemo-mechanical coupling is a complicated problem involving multi-scale evolution among micro-scale, meso-scale and macro-scale. The basic principle of wellbore instability in hard brittle shale under chemo-mechanical coupling was briefly introduced. In addition, the previous studies on the mechanism between hard brittle shale and drilling fluid, quantitative description of the evolution of damage in mesocosm structures, macroscopic mechanical deterioration of shale after hydration, and quantitative analysis of wellbore stability, were reviewed in terms of micro-scale, meso-scale and macro-scale. Moreover, a new idea was proposed for wellbore stability in hard brittle shale from the perspective of fracture mechanics considering chemical effects.
- deep formation,
- hard brittle shale,
- wellbore instability,
- multi-scale evolution,
- chemical induced fracture,
- chemo-mechanical coupling effect

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References

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Advancements and Considerations of Chemo-Mechanical Coupling for Wellbore Stability in Deep Hard Brittle Shale

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Advancements and Considerations of Chemo-Mechanical Coupling for Wellbore Stability in Deep Hard Brittle Shale

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