塔河油田高矿化度污水集输系统缓蚀剂SDH-1的研究

Study on Corrosion Inhibitor SDH-1 for High Salinity Wastewater Gathering and Transportation System in Tahe Oilfield

摘要:

针对高矿化度条件下油田污水集输系统腐蚀特点，利用松香、油酸、羟乙基乙二胺及氯乙酸钠，通过酰胺化、环化及季铵化反应，加入乙二胺四亚甲基膦酸钠，研制出耐高矿化度缓蚀剂SDH-1。采用红外、气质联谱对缓蚀剂SDH-1进行了结构表征，评价了其对20#钢的缓蚀性能，考察了其阻垢性能、破乳性能；通过等温吸附行为研究和极化曲线测定，分析了缓蚀机理。结果表明，缓蚀剂SDH-1浓度为30 mg/L时，在矿化度为243063 mg/L地层水体系中缓蚀率达90.47%，阻垢率为85.96%，分水率为96.3%；缓蚀剂在金属表面的吸附符合Langmuir吸附等温式，是一种以抑制阳极腐蚀为主的复合型缓蚀剂。与市售缓蚀剂相比，缓蚀剂SDH-1缓蚀效率提高12%以上，可有效减缓高矿化度条件下管道钢材的腐蚀速率。

Abstract:

According to the the characteristics of high salinity oilfield sewage collection system corrosion, using rosin and oleic acid, hydroxyethylethylene diamine and sodium chloroacetate, through amidation, cyclization and quaternization reactions, adding sodium ethylenediamine tetramethylenephosphonate, developed a corrosion inhibitor SDH-1 for high salinity. The structural characterization of the corrosion inhibitor SDH-1 was characterized by IR and GC-MS, the corrosion inhibition performance of it for 20# steel was evaluated, and it’s scale inhibition performance and demulsification performance were investigated; the inhibition mechanism was analyzed by isothermal adsorption behavior and polarization curve measurement. The results show that when the inhibitor concentration of SDH-1 was 30 mg/L, the corrosion inhibition efficiency was 90.47% in the formation water system with salinity of 243063 mg/L, the antiscale rate was 85.96%, the water diversion rate was 96.3%; the adsorption of corrosion inhibitor on the metal surface is in accordance with Langmuir adsorption isotherm, which is a kind of compound corrosion inhibitor mainly for suppressing anode corrosion . Compared with the commercially available corrosion inhibitors, the corrosion inhibition efficiency of corrosion inhibitor SDH-1 was increased by more than 12%, which could effectively reduce the corrosion rate of pipeline steel under high salinity.