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<p>Aiming at the engineering challenge of a casing deformation rate as high as 12% and a maximum diameter reduction of 64.53&#xa0;mm encountered during massive-scale fracturing of deep coalbed methane (CBM) wells in the Daning–Jixian Block of the Ordos Basin, this study reveals the casing deformation mechanism through a combination of numerical simulation and field data. Based on statistical analysis of engineering data from 13 casing deformation wells, a three-dimensional finite element model was established by using ABAQUS 2022 finite element software, incorporating bending stress, injection pressure, non-uniform external extrusion load, and the shear effect of natural fractures. Verification results show the model prediction error is less than 2%. Parametric analysis indicates that non-uniform external extrusion pressure is the primary controlling factor for casing plastic deformation. When the non-uniform external extrusion pressure exceeds 30&#xa0;MPa, a thin-walled casing (10.54&#xa0;mm) enters the yield stage, while the critical value for a thick-walled casing (12.7 mm) increases to 40 MPa. The research findings propose a collaborative control strategy involving optimization of casing wall thickness (recommended ≥ 12.7 mm) and control of the fracturing pressure gradient, providing a theoretical basis for the safe and efficient development of deep CBM resources.</p>

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Mechanism Investigation of Casing Deformation During Massive-Scale Hydraulic Fracturing in Deep Coalbed Methane Wells

  • 期刊论文

  • 发表日期：

    2025年10月23日

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  • Jianjun Wu,
  • Decai Yin,
  • Yu Yang,
  • Zhaoming Li,
  • Yinhua Liu,
  • Haifeng Zhao

摘要

Aiming at the engineering challenge of a casing deformation rate as high as 12% and a maximum diameter reduction of 64.53 mm encountered during massive-scale fracturing of deep coalbed methane (CBM) wells in the Daning–Jixian Block of the Ordos Basin, this study reveals the casing deformation mechanism through a combination of numerical simulation and field data. Based on statistical analysis of engineering data from 13 casing deformation wells, a three-dimensional finite element model was established by using ABAQUS 2022 finite element software, incorporating bending stress, injection pressure, non-uniform external extrusion load, and the shear effect of natural fractures. Verification results show the model prediction error is less than 2%. Parametric analysis indicates that non-uniform external extrusion pressure is the primary controlling factor for casing plastic deformation. When the non-uniform external extrusion pressure exceeds 30 MPa, a thin-walled casing (10.54 mm) enters the yield stage, while the critical value for a thick-walled casing (12.7 mm) increases to 40 MPa. The research findings propose a collaborative control strategy involving optimization of casing wall thickness (recommended ≥ 12.7 mm) and control of the fracturing pressure gradient, providing a theoretical basis for the safe and efficient development of deep CBM resources.