油井堵水用高强度酚醛树脂预聚体封堵剂的合成

Synthesis of phenolic resin prepolymer plugging agent with high strength for oil well plugging

以苯酚、甲醛为原料,氢氧化钠为催化剂,采用两步碱催化方法合成了一种高强度酚醛树脂预聚体封堵剂。考察了甲醛与苯酚摩尔比、体系pH值、反应温度和反应时间等对酚醛树脂预聚体性能的影响。结果表明：当甲醛与苯酚摩尔比为3：1、体系pH值为9-10、反应温度为90℃、反应时间为30 min时,得到水溶性好、黏度较低的酚醛树脂预聚体,且该预聚体固化后,形成的固体强度高;封堵剂强度随酚醛树脂预聚体用量的增加而增大,当酚醛树脂预聚体的质量分数为50.0%时,填砂管模拟实验测得的突破压力梯度为40.65 MPa/m,具有很强的封堵能力。

A kind of phenolic resin prepolymer plugging agent with high strength was synthesized by twostep alkali catalytic method with phenol and formaldehyde as raw materials and sodium hydroxide as a catalyst.The effects of the molar ratio of formaldehyde to phenol,pH value of the system,reaction temperature and reaction time on the seal performance of the plugging agent were studied.The results show that the resin prepolymer obtained has good water solubility and low viscosity,and the solid formed after curing of the prepolymer has high strength when the molar ratio of formaldehyde to phenol is 3：1,pH value of the system is 9-10,reaction temperature is 90℃ and reaction time is 30 min.The strength of the plugging agent increases with the increase of the prepolymer dosage.The breakthrough pressure gradient determined in the sand filling tube simulation experiment is 40.65 MPa/m,and the resin plugging agent has strong sealing ability when the mass fraction of the resin prepolymer is 50.0%.