石油钻采工艺2024，Vol.46Issue(1)：53-59,7.DOI:10.13639/j.odpt.202304024
考虑井筒完整性的固井方案风险评价方法
Risk assessment method for cementing program considering well integrity
摘要
Abstract
The development of the Jimsar shale oil is found with severe issues of well integrity failure due to fracturing,and the failure position and rate are highly differentiated among different cementing programs.To investigate the effects of cementing programs on well integrity during fracturing,two horizontal well models(ⅠandⅡ)were built in accordance with the characteristics of the cementing for the horizontal wells with two casing sections in the study area.The same positions of the 1st and 2nd casing sections and the solid-fluid interface between the cement sheath and drilling fluids in WellⅠwere selected for analysis.The effects of fracturing on the well were simulated using a finite element simulator.In cases of different cementing programs,the stress distribution patterns of the casing and cement sheath along the well during fracturing were clarified,the full-well multi-node failure risks were assessed,and the cementing program was optimized.The results showed that with the B annulus filled with drilling fluids,the Mises stress of the production casing is considerably higher than that with the B annulus occupied by the cement sheath,indicating higher damage risks.The stress of the cement sheath in the B annulus is higher than that in the C annulus.Moreover,the top of the B annulus cement sheath is prone to tensile failure,while the bottom is prone to compressive failure.TheⅠcementing program is found with lower risks of well integrity failure,compared with the Ⅱcementing program.The performed risk assessment and optimization provide guidance for the designs of cementing and well completion of wells to be fractured to deliver safe and cost-effective cementing and well completion programs.关键词
页岩油/固井方案/井筒完整性/套管变形/水泥环失效/风险评价Key words
shale oil/cementing program/well integrity/casing deformation/cement sheath failure/risk assessment分类
能源科技引用本文复制引用
张俊成,李军,谢士远,王雪刚,张浩,宋琳..考虑井筒完整性的固井方案风险评价方法[J].石油钻采工艺,2024,46(1):53-59,7.基金项目
国家自然科学基金联合基金集成项目"复杂环境下水泥环全生命周期密封理论与控制方法"(编号:U22B6003) （编号:U22B6003）
国家自然科学基金企业创新发展联合基金项目"构造应力集中区页岩气井套管载荷模型及结构完整性失效机理"(编号:U19B6003-05) （编号:U19B6003-05）
国家自然科学基金青年科学基金项目"页岩气井多级压裂诱发断层滑移量化计算模型与套管变形控制方法研究"(编号:52204018) （编号:52204018）
中国石油大学(北京)克拉玛依校区引进人才基金"页岩油气井全生命周期井筒完整性分析与优化体系构建"(编号:XQZX20220019). （北京）
