舍女寺油田高压注水引起的套管水泥环应力变化及泥岩蠕变对套管的影响

Casing Effect with Cement Sheath Stress Variation and Mudstone Creep by the Influence of High Pressure Water Injection in SHE NV SI Reservoir

高压注水将会引起套管内压的变化,在这些不同条件影响下,对套管、水泥环应力场、位移场的变化规律的认识将有助于我们深入理解套管损坏的机理,设计合理的注水压力界限。文章拟采用三维有限元方法,研究以上不同因素对套管、水泥环应力的影响规律,并且分别从地应力的非均匀性引起的套管应力变化规律、泥岩断层蠕变位移引起的应力变化规律以及注水引起地层吸水软化引起的应力变化规律进行研究,以加深对高压注水导致地层、套管破环机理的认识。

High pressure water injection will cause the change of the casing pressure,in the influence of different conditions,the awareness of casing、cement sheath stress and displacement field will contribute to understanding the mechanism of casing damage,designing reasonable injection pressure boundary.This paper uses the 3-D finite element method,studying the influence of different factors on the casing stress and cement sheath stress,researching the changing regularity of casing stress with non-uniform crustal stress、mudstone fault creep displacement and water injection,deepening the understanding of the mechanism by high-pressure water injection on formation and casing damage.