Abstract
The mechanical properties of hydrate-bearing sand-well interface are essential for the stability of hydrate reservoir, the stability of exploitation well and the safe exploitation of hydrate. However, hydrate decomposition and interface roughness evolution change the mechanical properties of hydrate-bearing sand-well interface, which causes the futility of conventional mechanical properties analysis methods. Based on the self-designed test device, a series of shear tests were carried out considering hydrate saturation, hydrate dissociation, and interface roughness. The results show that the interfacial shear strength, cohesion, and dilatancy of hydrate-bearing samples and hydrate-decomposed samples increase with the increase of interfacial roughness and hydrate saturation. After the dissolution of hydrate, the shear strength, cohesion, and dilatancy of the interface decrease, and the weakening behavior becomes more obvious with the increase of interface roughness and hydrate saturation. In addition, based on the statistical damage theory and Duncan-Chang interface constitutive model, a mechanical model of hydrate-bearing sand-well interface is proposed. The results show that the model is in good agreement with the experimental results, and the model can better simulate the stress-displacement relationship of the sample under different conditions. The research results can provide reference for the stability evaluation of hydrate-bearing reservoirs and exploitation wells in the exploitation process.
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The authors wish to thank the two reviewers and the editor for their kind advice, which has significantly enhanced the soundness of this paper.
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The financial support was provided by Natural Science Foundation of China (No. 51890914; No. 52179119).
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Li, J., Zhang, Y., Lin, L. et al. Study on the shear mechanics of gas hydrate-bearing sand-well interface with different roughness and dissociation. Bull Eng Geol Environ 82, 404 (2023). https://doi.org/10.1007/s10064-023-03432-9
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DOI: https://doi.org/10.1007/s10064-023-03432-9