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中文摘要：
井眼稳定和地层出水问题限制着气体钻井技术的推广应用。采用细观损伤力学方法建立了气体钻井井眼稳定的力学模型，通过跟踪声发射信号研究了井壁围岩在应力下的损伤演化，着重探讨了井眼稳定的特殊杌理、均匀分布载荷和不均匀分布载荷下井眼周围的损伤特点。研究发现，气体钻井的井眼稳定存在一个临界状态，在该状态以内，井眼周围出现范围较小的损伤区（塑性区），但井眼是稳定的；超过该状态，损伤区（塑性区）大范围扩展导致井眼失稳，井眼周围损伤区内形成了微裂纹和裂缝，造成转换介质后井壁失稳。数值模拟结果和室内真三轴试验结果吻合。开发了利用综合测井资料进行钻前水层预测和气体钻井井壁稳定评估的软件，在几个区块的应用检验表明，预测结果和实际情况吻合。
英文摘要：
The application of gas drilling was restrained by wellbore stability and formation water production. A wellbore satiability mechanics model was crated using mesoscopic damage mechanics. The damage evolution around wellbore was investigated by tracking acoustic emissions. The particular mechanism of wellbore stability and wellbore damage under loading was investigated in detail. The study indicates that there is a critical condition of wellbore stability in gas drilling. Under this condition, the damage （plastic） zone may appear around wellbore, but the wellbore is stable. Over this condition, the damaged （plastic） zone would propagate and form minor fracture which caused wellbore collapse. Numerical results agree with true triaxial experiments. The software to predict formation water production using well logging and to evaluate wellbore stability was developed. The application results in several oil fields agree with the actual results.
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