耐温抗盐稠油降黏剂的室内实验研究

Study on Heat Resistant and Salt Tolerent Viscosity Reducer for Heavy Oil

本文针对中原油田稠油油藏地质及稠油特征,应用正交实验设计方法,实验筛选出了耐温抗盐稠油乳化降黏剂体系,最佳配方如下:0.05%聚氧乙烯壬基苯酚醚NP-10+0.1%两性离子表面活性剂CS-B+0.1%十二烷基苯磺酸钠ABS,即在复配降黏荆体系中NP-10、CS-B、ABS的质量比为1:2:2时的降黏效果最佳。研究了pH值、含水量、水矿化度,二价阳离子浓度、温度、配伍性等稠油降黏剂性能的影响。结果表明:在油水比7:3、50℃下所筛选的最佳降黏剂体系对稠油的降黏率达99%,耐温110℃,耐盐,可满足于中原油田的稠油井的降黏需要。

According to the heavy oil reservoir geology and the characteristics of heavy oil of Zhongyuan oilfield, through the orthogonal experimental design method, the optimal recipe of the titled viscosity reducer system was obtained as follows： 0.05% nonylphenol polyethylene ether NP-10＋0.1% amphoteric ionic surface active agent CS-B＋0.1% sodium ABS, in other words, when the mass ratio of NP-10, CS-B and ABS was 1：2：2, the viscosity-reducing effect of the system was the best. Moreover, the effects of pH value, water content, water salinity, bivalent cation concentration, temperature, et al, on the viscosity reduction of the heavy oil were investigated. The viscosity reduction rate of the heavy oil was up to 99% when the mass ratio of the heavy oil to the viscosity reducer solution was 7：3, in addition, the system was resistant to high temperature of 110℃, and tolerant to Ca2＋ and Mg2＋. In a word, the viscosity reducer was suitable for the heavy oil well of Zhongyuan oilfield.