控水防砂剂室内评价及现场应用研究

Laboratory Evaluation and Field Application of Water Plugging and Sand Control Agent

水驱油藏进入开发后期以后,控水和防砂是油田开发过程中急需解决的两大难题。以水介质分散形聚丙烯酰胺乳液为交联主剂,水溶性酚醛树脂为交联剂,树脂涂覆砂为防砂剂,按比例混合形成控水防砂体系。其作用机理为聚丙烯酰胺和酚醛树脂经交联反应形成冻胶控水,稳砂剂通过稳砂和挡砂控制油田出砂。在室内以成冻时间、成冻强度、抗压强度为主要评价指标,分别采用目测代码法、突破真空度法和黏度法,并分别考察聚合物浓度、交联剂浓度、温度等因素对控水防砂体系的影响,优选出控水防砂体系的配方为0.5%聚丙烯酰胺+0.8%酚醛树脂。现场控水防砂作业表明,该配方对油井的控水防砂措施效果明显。

When water drive reservoir has been into the late stage of development, water plugging and sand control are two problems that need to be resolved in the oidfield development process. Water plugging and sand control system are made of polyacrylamide emulsion as the key cross-linking agent, Watersoluble phenolic resin as a crosslinking strength and agent, and the resin-coated sand as sand control agent mixed in proportion. The gelling time and gell compression strength were as the main evaluated index and optimize formula by compartition of gel strength, BV value device and viscosity tion, temperature, and surfactant on the measurement. The effect of polymer concentration, crosslinker concentra- performance of the water plugging and sand control system are investigated. Based on the results of indoor test, on-site tests of water plugging and sand control integration are carried out in field application, and the effect is obvious