A Model for Predicting Borehole Wall Stability in High Stress Fractured Formations
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摘要: 针对顺北及川西海相碳酸盐岩破碎性地层井壁坍塌失稳技术难题，建立了可视化真三轴井壁失稳物模实验平台，开展了破碎性地层微观结构特征、理化特性及力学性能研究，明确了地应力集中、地层破碎、钻井液与岩石间力化耦合作用是破碎地层井壁失稳主控因素。引入地层完整性系数，建立了“地层完整性系数+钻井液浸泡”与力学参数关系，基于有限元模拟，揭示了破碎性地层地应力分布规律，基于等效岩体力学参数，考虑钻井液-岩石间化学作用，构建了基于M-C准则的坍塌压力预测模型。SHB9X、PZ5-3D、PZ6-5D等典型井坍塌压力预测精度高达86.0%～93.9%。Abstract: To deal with the wellbore collapse and instability problems encountered in drilling the broken marine carbonate formations in Shunbei and western Sichuan, a visual true triaxial wellbore instability physical simulation experimental platform was prepared and used to study the microstructural characteristics, physiochemical characteristics and mechanical properties of the broken formations, and it was understood that concentrated geostress, formation fragmentation and the mechanical-chemical coupling effect between the drilling fluid and the rocks are the main controlling factors for wellbore instability. By introducing a formation integrity coefficient, a parameter relationship between the “formation integrity coefficient + drilling fluid soaking” and formation mechanics was established. Based on finite element simulation, the distribution of the geostress of the broken formations was revealed. Based on equivalent rock mechanics parameters and taking into account the chemical interaction between drilling fluid and rock, a collapse pressure prediction model based on M-C criterion was constructed. The prediction accuracy of collapse pressure in typical wells, such as the well SHB9X, PZ5-3D and PZ6-5D, is as high as 86.0%-93.9%.
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Key words:
- Broken formation /
- Wellbore instability /
- High stress /
- Carbonate rock /
- Prediction model
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