新型环氧-酚醛树脂体系的固砂原理与技术

为了在低成本下解决低温油井中的化学防砂问题,采用共混的方法制备了一种以环氧树脂和酚醛树脂为主要原料,且无需其他固化剂的新型树脂固砂剂,并在固砂剂的研究基础上初步研制了树脂涂覆砂.通过红外光谱分析,研究了树脂固化的机理.实验结果表明,固砂剂可在50?℃的水浴中将砂石固结,固结砂样具有较高的抗压强度和渗透率,而且随着树脂用量的增加,固结砂样的抗压强度可以进一步得到提高.涂覆砂可以在酚醛树脂作为外固化剂的情况下固结,其性能满足使用要求.酚醛树脂中的酚羟基和羟甲基与环氧树脂中的环氧基的反应是固化反应的主要机理.

Principle and technique of sand consolidation with novel epoxy-phenolic resins system

To solve the problem of chemical sand control in low-temperature oil wells cost-effectively, a novel sand consolidation agent was prepared with epoxy resin and phenolic resin as the primary raw material and without any other curing agents by means of the blending method. On the basis of the sand consolidation agent, a kind of resin-coated sand was developed initially. By analysis of Fourier transform infrared spectroscopy(FT-IR), the cure mechanism of resins was investigated. The results show that thesand consolidation agent can consolidate sandstone in water at 50℃ and consolidated specimens have high compression strength and permeability. As the quantity of resins is increased, the compression strength of consolidated specimens can be further increased. The resin-coated sand can consolidate with the phenolic resin as an external curing agent and the properties of consolidated specimens can satisfy use requirements. The reaction of phenolic hydroxyl and hydroxyl methyl in phenolic resin with epoxy in epoxy resin is the major mechanism of the curing reaction.