环氧树脂改性多异氰酸酯微胶囊的制备及其防砂性能

Preparation of epoxy resin modified polyisocyanate microcapsules and its anti-sand properties

为提高疏松油田的采油率,研发高性能防砂是必须要采取的工艺措施,本论文通过二苯基甲烷二异氰酸酯多聚体(MDIP)与环氧树脂(E-51)反应,制备环氧树脂改性多异氰酸酯(EMP).通过物理化学法中复相乳液法对EMP进行微胶囊化.进行红外、核磁、扫描电镜等结构表征,证明EMP的成功制备.同时EMP微胶囊固砂液平均粒径为0.1359μm和动力学稳定指数(TSI)为0.468,表明该微胶囊的粒径分布均一,且体系稳定.在达到油井粉细砂固结要求的同时最环保和节约成本条件下,得到最佳固砂配方和条件下固结砂柱的抗压强度为6.563 MPa,渗透率为1476 mD,出砂量为6 mg,出砂率为0.006%,同时还具备良好的耐酸、耐盐、耐氧化性,显著提高油井采油率.

In order to improve the oil recovery rate in sparse oil fields,the development of high performance anti-sand is a necessary process measure.In this thesis,epoxy-modified polyisocyanate(EMP)was prepared by reacting diphenylmethane diisocyanate multimer(MDIP)with epoxy resin(E-51).Microencapsulation of EMP was carried out by the complex emulsion method in the physicochemical method.Infrared,NMR and SEM characterizations were performed to demonstrate the successful preparation of EMP.The average particle size of EMP microencapsulated sand solidification solution was 0.1359μm and the kinetic stability index(TSI)was 0.468,which indicated that the particle size distribution in the microencapsulated sand solidification solution was uniform and the system was stable.Under the conditions of environmental protection and cost saving,the compressive strength of the cemented sand column was 6.563 MPa,the permeability was 1476 mD,the sand output was 6 mg,and the sand output was 0.006%,which also had good resistance to acid,salt and oxidation,and significantly improved the oil recovery rate.