The resin-based plugging and adjustment system is one of the effective methods to improve oil recovery attribute to their ability to generate insoluble and immiscible Polymer materials with high strength, excellent temperature and salt resistance. The urea formaldehyde resin (Poly-UF) was prepared firstly, then, the melamine was introduced into Poly-UF to synthesize melamine resin (Poly-UF-m), and the preparation technical parameters were further established depends on single factor experimental method. As a result, the performances of Poly-UF-m were enhanced, the free formaldehyde content is reduced by 47.15 %, the solid content and viscosity are increased by 3.47 and 37.93 %. Based on the preparation and investigation of Poly-UF and Poly-UF-m, the 0.01 wt% HPAM, 4 wt% NH4Cl solution (25 wt%), 3 wt% nano-SiO2 and 0.3 wt% C6H6O were introduced into Poly-UF-m to prepare resin plugging agent. As a result, it was confirmed that the Poly-UF-m plugging agent with excellent application properties, such as well temperature, shear, salt, water, kerosene, acid and alkali resistance. Moreover, the Poly-UF-m plugging agent with a denser structure, smoother surface, higher mechanical strength, smaller pores and better thermal stability. Furthermore, based on the core plugging experiments, the quartz sand as the simulation object for permeable rock core, and the results show that the plugging rate is 98.0 % by adding 20 wt% Poly-UF-m plugging agent to quartz sand, which indicates that the developed Poly-UF-m plugging agent has a good sealing effect on fractured and caved reservoirs.

中文翻译：

---

脲醛树脂用作裂缝和崩落储层堵漏剂的制备、优化和改性


基于树脂的封堵和调节系统是提高石油采收率的有效方法之一，因为它们能够生成具有高强度、优异温度和耐盐性的不溶性和不混溶性聚合物材料。首先制备脲醛树脂（Poly-UF），然后将三聚氰胺引入Poly-UF中合成三聚氰胺树脂（Poly-UF-m），并依靠单因素实验方法进一步建立制备技术参数。结果，Poly-UF-m 的性能得到增强，游离甲醛含量降低了 47.15 %，固体含量和粘度分别增加了 3.47 和 37.93 %。在制备和研究Poly-UF和Poly-UF-m的基础上，将0.01 wt% HPAM、4 wt% NH4Cl溶液（25 wt%）、3 wt%纳米SiO2和0.3 wt% C6H6O引入Poly-UF-m中制备树脂堵塞剂。结果证实，Poly-UF-m 堵漏剂具有优异的应用性能，如井温、剪切、盐、水、煤油、耐酸碱。此外，Poly-UF-m 堵塞剂具有更致密的结构、更光滑的表面、更高的机械强度、更小的孔隙和更好的热稳定性。此外，基于岩心封堵实验，以石英砂为透水岩心的模拟对象，结果表明，在石英砂中加入20 wt%的Poly-UF-m堵漏剂，封堵率为98.0 %，表明所研制的Poly-UF-m堵漏剂对裂缝和崩落储层具有良好的密封效果。