一种水溶性双基稠油降黏剂的制备及应用

Preparation and Application of Water-soluble Double-based Heavy Oil Viscosity-reducing Agent

石昀 安丽媛 谢富强 刘存辉 周传臣 王志宏 朱琳 孙凤萍

SHI Yun AN Liyuan XIE Fuqiang LIU Cunhui ZHOU Chuanchen WANG Zhihong ZHU Lin SUN Fengping

针对大港南部油田高温高矿化度、高含蜡、中低渗稠油油藏的开采需要，选择亲油单体乙烯基吡嗪、马来酸 十三酯和亲水单体AMPS，与丙烯酰胺进行反相乳液聚合反应，制备了一种水溶性双基稠油降黏剂乳液。研究 了不同合成条件对疏水单体酯化率的影响，通过考察疏水单体加量、各单体质量比、乳化剂质量比、引发剂加量 对合成降黏剂降黏、乳化效果的影响，确定了的降黏剂优化合成条件。研究了按优化合成条件所合成降黏剂的 耐温性能、抗盐性能、剥离稠油效果及对大港油田几类黏度偏高的稠油的降黏效果，并报道了合成降黏剂在大港 南部油田应用3 井次的矿场实验效果。降黏剂的优化合成条件为：马来酸十三酯加量为0.6%，AM、AMPS、乙烯 基吡嗪、马来酸十三酯质量比为7∶1∶3∶2，吐温80、斯盘60 质量比为1.5∶1，引发剂加量为400 mg/L，氧化剂、还原 剂与偶氮引发剂质量比为1∶0.5∶0.8。该降黏剂耐温达180 ℃，耐盐达50 000 mg/L，22 h 可实现稠油完全剥离。 用不同区块采出水配制质量分数为1%的降黏剂溶液，按油水比7∶3 与稠油混合后，稠油的降黏率均可达95%以 上。该产品在大港南部油田某区块开展了3 井次降黏试验，针对现场需求采取化学吞吐和井筒护理的形式开展 措施作业，措施后取得一定增油和降低载荷的效果。

In view of the exploitation needs of heavy oil reservoirs with high temperature，high mineralization，high wax content and low permeability in southern Dagang oilfield，lipophilic monomer vinyl pyrazine，tridecyl maleate and hydrophilic monomer AMPS were selected for inverse emulsion copolymerization with acrylamide，and a water-soluble double base heavy oil viscosity-reducing agent emulsion was prepared. The effect of different synthetic conditions on the esterification rate of the hydrophobic monomer was investigated，the optimized synthesis conditions of viscosity reducer were determined through investigating the influence of the amount of hydrophobic monomer，the mass ratio of each monomer，the mass ratio of emulsifiers and the amount of initiator on the viscosity reduction and emulsification effect of the synthetic viscosity reducer. The temperature resistance，salt resistance，stripping effect of heavy oil and viscosity reduction effect of several types of high viscosity heavy oil in Dagang oilfield were studied. The field test results of 3 well times of application of synthetic viscosity reducer in Dagang South Oilfield were reported. The optimum synthesis conditions of the viscosity reducer was as follows，the tridecyl maleate dosage was 0.6%，the mass ratio of theAM，AMPS， vinyl pyrazine，tridecyl maleate was 7∶1∶3∶2，mass ratio of Tween 80 and Span 60 was 1.5∶1，initiator dosage was 400 mg/L，and mass ratio of oxidant，reducing agent and azo initiator was 1∶0.5∶0.8. The viscosity reducer had a temperature resistance of 180 ℃ and a salt resistance of 50 000 mg/L. the heavy oil could be completely stripped within 22 h. after mixing in the oil-water ratio of 7∶ 3，the viscosity reducer solution with a mass fraction of 1%，prepared with produced water from different blocks，could make the viscosity of the heavy oil reduce by more than 95%. The viscosity reduction tests was carried out using the viscosity reducer in block of Dagang south oilfield，the operation of chemical huff and puff and wellbore care was adopted according to the site demand，and the effect of increasing the oil and reducing the load was obtained.

10.19346/j.cnki.1000-4092.2023.01.017