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榆树林油田为特低渗透油田 ,油田开发的主要特征为高压注水开发 ,套管损坏较多 .分析了榆树林油田套损状况 ,套损原因主要为 :高压注水导致区块压力不平衡 ,没有建立有效的驱替压力系统 ;高压注水加速泥岩吸水速度 ,改变了套管周围外载荷的分布 ,导致外载超过套管抗挤强度 ;套管设计依据不足 ,没有充分考虑开发过程中套管的外挤力和非均匀外载等因素
The Yushulin Oilfield is an ultra-low permeability oilfield, with the main features of oilfield development being high-pressure water injection development and more casing damage.Through the analysis of Yushulin oilfield casing damage conditions, the main causes of casing damage are: high pressure water injection causes unbalanced block pressure, To establish an effective displacement pressure system; high pressure water injection to speed up the absorption rate of mudstone, changing the distribution of external load around the casing, resulting in external load exceeds the casing extrusion strength; inadequate casing design basis, did not fully consider the casing during the development process External force and uneven external load and other factors