坨28断块油水井套管损坏的地质因素分析

套管损坏是影响油田安全高效生产的制约因素,坨28断块及其周围断裂发育、地层结构复杂,套管损坏较为严重。断层蠕滑、岩性变化、地下水腐蚀是导致坨28断块套管损坏严重的主要地质因素,其中断层对套管损坏的影响最大,有约2/3的套管损坏与断层有关。长期注水开发使得岩性发生较大变化,导致随开发程度加深而套管损坏严重。地质环境是油气田赖以存在的物质基础,是客观存在的,只有尽可能多地了解套管损坏的地质因素并有针对性地采取适当预防措施,才能最大程度地减轻套管损坏的损失乃至避免套管损坏,有效控制和降低修井施工成本。

Analysis of Geological Factors of Casing Damage in Tuo 28 Fault Block

Casing damage is the restrict factor of safe and high efficacious production in oilfield. The fault systems and stratum structure in Tuo28 fault block are very complex. Casing damage in Tuo28 is quite serious. There are 3 cardinal geological factors lead to the serious casing damage in the well Tuo28, which are the fault wriggle, the lithology change and the groundwater erode. All of factors, fault exert most influence on casing damage. About 2/3 casing damage has relationship with fault. While the variety of lithology is relatively large by long-term waterflood development, the casing damage is more serious with further development. Geological environment is physical basement of existing oilfield. Only when knowing more about geological setting and taking appropriate preventive pertinently, the loss of casing damage could be furthest abated, the cost of workover could be fall down and controlled effectively.