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基于油管和套管的腐蚀机理和防腐机理,开发了一种基于吡啶季铵盐为主剂的环空保护剂配方体系。性能评价结果表明:该环空保护剂对油管、套管和橡胶试件具有良好的腐蚀保护性能,对环套内腐蚀介质具有良好的阻垢性能和杀菌能力,能够有效地保护环套管空间;由于除硫剂的加入,使其抗硫化氢能力加强,可在含硫油气田中使用。该配方现场使用方便,可适应不同井深条件下的密度为1.30—1.35 g/cm3的油田盐水;该环空保护剂具有良好的热稳定性,抗高温能力强,可在高温深井中使用。
Based on the corrosion mechanism and anticorrosive mechanism of tubing and casing, an annular protectant formulation system based on pyridine quaternary ammonium salt was developed. The results of performance evaluation show that the annulus protectant has good corrosion protection performance for tubing, casing and rubber specimens, has good scale inhibition and bactericidal ability to corrosive media in the casing, and can effectively protect the casing space ; Due to the addition of desulfurization agent to enhance its ability to resist hydrogen sulfide, can be used in sulfur-containing oil and gas fields. The formula is easy to use on site and can adapt to oil field brine with the density of 1.30-1.35 g / cm3 under different well depth conditions. The annular space protectant has good thermal stability, high temperature resistance capability and can be used in high temperature and deep wells.