塔河油田为世界上最深的碳酸盐岩油藏,井深6500m,油田为典型的高H2S、高矿化度水腐蚀环境,近年来频频发生井口附近套管腐蚀断裂、悬挂器窜漏。目前只能通过取换方式处理井口段套管与悬挂器,取换作业难度大、要求高。本文针对套损井固井工艺,结合作业难度,提出了两套井口套管取换方案,推荐优先采用套管倒扣直接对扣回接的方案。 Tahe Oilfield is the deepest carbonate reservoir in the world with a well depth of 6500m. The oilfield is a typical high-H2S, high-salinity water corrosive environment. In recent years, casing corrosion and fracture near the wellhead and hanger leakage have frequently occurred. At present, the casing section and hanger of the well head section can only be dealt with by way of replacement, which is difficult and requires high replacement. In this paper, according to the technology of casing damage well cementing, combined with the difficulty of operation, two sets of wellhead casing replacement schemes are proposed.