部分水解聚丙烯酰胺/乳酸铬在油田污水条件下的成胶特性研究

Gelling Characteristic of Partially Hydrolyzed Polyacrylamide/Lactic Acid Chromium Gel in Oilfield Sewage

王克亮 孔 辉 付国强 李维亮

WANG Keliang， KONG Hui，FU Guoqiang，LI Weiliang

为了采用油田污水配制性能优良的聚合物弱凝胶调驱剂， 研究了油田污水中各组分对部分水解聚丙烯酰胺/乳酸铬成胶性能的影响， 优选出适合污水条件下的部分水解聚丙烯酰胺/乳酸铬凝胶体系， 考察了该凝胶体系对岩心的封堵作用。结果表明： 随着 Na+、 Mg2+、 Ca2+浓度及矿化度的增加， 部分水解聚丙烯酰胺/乳酸铬成胶时间缩短、 凝胶黏度增加； 随 S2-浓度增加， 成胶时间延长、 凝胶黏度降低， S2-加量大于 30 mg/L时， 体系难以成胶； 含油量对凝胶的成胶无影响； 凝胶最佳配方为： 三氯化铬与乳酸摩尔比 1∶8， 部分水解聚丙烯酰胺、 交联剂和硫脲的质量浓度分别为 2000、 200和 800 mg/L， 该凝胶体系的成胶时间为 25 h， 成胶后的黏度为 20 Pa·s， 对岩心的封堵率达 85%以上， 可用油田采出污水配制。表8参12

In order to prepare polymer weak gel profile control agent with high performance using oilfield sewage，the influence of sewage component on the gelling property of partially hydrolyzed polyacrylamide/lactic acid chromium gel was studied. The optimum formula of partially hydrolyzed polyacrylamide/lactic acid chromium gel system that was suitable for sewage was selected，and the plugging effect was investigated. The results showed that the gelling time of partially hydrolyzed polyacrylamide/lactic acid chromium gel system decreased and gel viscosity increased with the increase of Na+，Mg2+ and Ca2+ concentration and salinity. The gelling time increased and gel viscosity decreased with increasing concentration of S2-. When the concentration of S2+ was more than 30 mg/L，it was hard to gel. The oil content had no effect on gel. The optimum formula of gel was obtained as follows: 1∶8 the molar ratio of chromium trichloride to lactic acid，2 g/L partially hydrolyzed polyacrylamide，200 mg/L crosslinking agent，800 mg/L thiourea. The gelling time was 25 hrs and the viscosity of gel was 20 Pa·s. The core plugging rate could reach more than 85% in three different permeability cores，indicating good compatibility between the gel and sewage.

10.19346/j.cnki.1000-4092.2016.06.011