岩性油气藏 ›› 2024, Vol. 36 ›› Issue (5): 114.doi: 10.12108/yxyqc.20240501
闫建平1,2,3, 来思俣1,2, 郭伟4, 石学文5, 廖茂杰5, 唐洪明1,2, 胡钦红6, 黄毅7
YAN Jianping1,2,3, LAI Siyu1,2, GUO Wei4, SHI Xuewen5, LIAO Maojie5, TANG Hongming1,2, HU Qinhong6, HUANG Yi7
摘要: 通过调研国内外大量页岩气井套管变形方面的文献,总结了页岩气井套管变形的类型,探讨了深、浅层页岩气套管变形影响因素差异及面临的问题,并提出了针对性的防治措施及下一步主要研究方向。研究结果表明:①页岩气井套管变形类型主要包括挤压缩径变形和剪切变形,深层页岩气井出现套管变形的概率较中浅层更大,主要为剪切变形。②造成套管变形的工程因素包括井筒降温、固井质量、套管疲劳、套管质量以及井眼狗腿度等,地质因素包括岩石力学特性、非均匀地应力以及天然裂缝/断层滑移等;深层页岩气井套管变形主要受天然裂缝/断层滑移的影响。③页岩气井套管变形风险防治措施包括控制井筒温度及注入强度,采用水泥环力学性能参数较低的水泥进行固井作业,适当减小套管外径、增大壁厚、提升钢级等提高套管质量,以及尽量让井轨迹平滑等;对深层页岩气井可通过将井眼水平段延伸方向与岩层层理方向设计为一致,掌握裂缝分布情况、尽量避开高风险剪切滑移层段,对不同级别滑移风险层段合理降低压裂规模、调整井筒方位等措施来降低套管剪切变形的风险。④页岩气井套管变形防治研究方向主要包括优选岩石力学特性好的压裂层段、最优井轨迹与地应力的关系分析、裂缝识别与评价、断层滑移量与套变量计算等方面。
中图分类号:
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