【摘要】 文章采用水泥石相态分析等方法 ,对水泥石腐蚀机理进行了探讨 ,指出地层水溶蚀基体Ca(OH) 2 、与Ca(OH) 2 作用生成非胶结相及扩散作用 ,是水泥石腐蚀和套管外壁腐蚀破坏的基本原因 ,提出用抗腐蚀水泥形成保护环防止套管外壁腐蚀的技术思想 ,研制开发出适应封固洛河地层的新型低密度水泥体系 ,应用该体系成功地解决了长庆油田洛河水层套管外壁腐蚀的技术难题 ,有效延长了油气井生产寿命。更多还原

【Abstract】 The mechanism of set cement corrosion is discussed by using phase analysis method in this paper. It is pointed out that the unconsolidated phase and diffusional effect as a result of the action of formation water solution matrix Ca(OH) 2 with Ca(OH) 2 are the basic reason causing the corrosion of the set cement and casings exterior wall and a technical idea of using corrosion resistant cement to from a protection ring to prevent casings exterior wall corrosion is put forward. A new low density cement system suited to sealing Luohe formation is developed and, by using it, the difficult problem of casings exterior wall corrosion in Luohe aqueous layer in Changqing Oil Field is successfully solved, effectively prolonging the production phase of oil and gas wells.更多还原