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哈6区块存在CO_2和H_2S含量高,地层水矿化度高、Cl~-含量高等腐蚀结垢恶劣条件,极易发生腐蚀结垢、影响油井正常生产。区块主要在CO_2/H_2S共存条件下造成腐蚀,其主要影响因素为p_(CO_2)/p_(H_2S)值,地层水中成垢离子受温度、压力降低导致溶解度降低而结垢,酸化措施是由于缓蚀剂被岩层矿物吸附,导致残酸返排时对管柱造成腐蚀结垢,注气替油措施是因为溶解氧的存在造成管柱腐蚀结垢。从部位、缝洞带、生产管柱、产出液含水、酸化措施共5个方面分析了腐蚀结垢现状,结果显示整体表现较轻微,但不容忽视。目前油管、套管使用以抗硫管柱为主,地面设备及管道防腐采用深井阳极强制电流阴极保护方法。在前人研究基础上,针对性地提出了根据p_(CO_2)/p_(H_2S)值确定使用油管材质、酸化顶替液改进、注气替油措施改进等8个方面治理对策,为保证油井正常生产奠定了良好基础。
There is high content of CO_2 and H_2S, high salinity of formation water and high corrosion rate of Cl ~ - content in Ha 6 block, which are prone to corrosion and scaling, affecting the normal production of oil well. The main corrosion is caused by the coexistence of CO_2 / H_2S, the main influencing factor is p_ (CO_2) / p_ (H_2S). The scale-forming ions in the formation water are reduced by the decrease of temperature and pressure, Corrosion inhibitors are adsorbed by rock minerals, resulting in residual acid back to the column caused by corrosion scaling, gas injection for oil because of the presence of dissolved oxygen causes corrosion column fouling. The corrosion and fouling status was analyzed from five aspects: the location, the seam hole, the production string, the hydration of the production fluid and the acidification measures. The results showed that the overall performance was slight but could not be ignored. At present, the tubing and casing are mainly used for anti-sulfur column, and the ground equipment and pipeline anticorrosive use the deep well anode forced current cathodic protection method. On the basis of the previous studies, we put forward some countermeasures for the prevention and cure of oil well according to the determination of p_ (CO_2) / p_ (H_2S) value, the improvement of acidizing displacement fluid, and the improvement of gas injection and replacement of oil. Production has laid a good foundation.