塔河油田奥陶系定容体油藏压井技术探讨

Discussion on Killing Technology of Ordovician Fixed Volume Reservoir in Tahe Oilfield

塔河油田奥陶系油藏以微裂缝、溶蚀孔隙、裂缝及溶洞为主要储集空间,缝洞关系分布复杂,地层非均质性严重。定容体油藏是没有纵深断裂沟通深部大水体的封闭缝洞系统,能量保持程度低,衰减速度快,在定容体油藏井进行井下作业过程中普遍存在漏失现象,随着漏失量的增大,定容体油藏能量得到补充,出现又漏又涌现象,压井难度大。简要分析了塔河油田奥陶系定容体的油藏特征及压井难点,并结合现场压井经验对此类油藏的压井技术进行探讨。

The Ordovician reservoirs in Tahe oilfield have the characteristics of micro-fractures,dissolution pores,cracks and caves as the main reservoir space.The distribution of fractures is complex and the heterogeneity of strata is serious.The fixed volume reservoir is a closed crevice system with deep deep fault without deep fault.The energy retention degree is low and the decay rate is fast.In the process of underground operation,The fixed capacity of the reservoir to be added to the energy,there are leakage and Chung Chung phenomenon,difficult to roll.This paper briefly analyzes the characteristics of reservoirs and the difficulties of wellding in the Ordovician system of Tahe Oilfield,and discusses the killing technology of such reservoirs with the experience of field welding.