破除聚合物凝胶的试验研究

EXPERIMENTAL RESEARCH ON BREAKING POLYMER GEL

郑延成 赵修太 赵维鹏

Zheng Yancheng Zhao Xiutai Zhao Weipeng

江汉石油学院 长城润滑油集团公司

在考察单一氧化剂H2O2、K2S2O8和氧化剂BH、CH对聚合物凝胶破解的基础上,采用了复配氧化剂,利用正交试验法探讨破胶剂的优化组成。评价试验结果表明,60℃环境温度下优选的破胶剂组成为:0.35%H2O2、0.4%K2S2O8、0.5%BN、0.6%CN,对粘度为2.3×105mPa·s的六次甲基四胺交联的聚丙烯酰胺凝胶的破胶效果理想,在pH=2时,可使凝胶聚合物的破解效率达99%以上,破胶后残液粘度低。岩心模拟试验结果表明,使用该破胶剂破胶前,堵水率98%以上,破胶后渗透率恢复值可达98%以上。能够有效解除聚丙烯酰胺凝胶的堵塞。

On the basis of investigation of breaking polymer gel with oxidizers such as H2O2,K2S2O8,BH,CH,this paper uses the orthogonal test method to probe the optimized composition of gel breaking agent.Test results show that the composition of the optimized agent at 60℃ is as follows:0.35% H2O2,0.4% K2S2O8,0.5% BH and 0.6% CH.The compounded oxidizer can effectively break the polyarylamide gel crosslinked by hexamethylene teramine with the viscosity of 2.3×105 mPa·s.When the pH is 2,the percentage of gel breaking can be up to 99%,and the viscosity of the post-breaking residual fluid is low.Core test results show that the water shutoff percentage is above 98% before breaking gel,and the recovered value of permeability after breaking gel can be more than 98%.

10.3969/j.issn.1000-7393.1999.05.017