耐高温深部调驱剂实验研究

Experimental Research on Thermostable Deep Oil Profile Control Agent

针对低度交联聚合物调驱剂耐温能力的不足,优选出合成耐温调驱剂的主要原料,并通过实验筛选出耐温调驱体系的最佳配方:聚合物HPAM 1 500 mg/L+酚醛树脂交联剂500 mg/L+有机铬交联剂20 mg/L+盐热稳定剂100 mg/L+除氧剂100 mg/L。此调驱体系采用二次交联技术,耐温可达100～110℃。实验结果表明,调驱剂的成胶时间随温度升高而缩短,温度为80～110℃时,胶体强度都在10 000 mPa·s以上。体系在110℃下成胶之后的老化过程中,随着时间的延长,黏度降低。老化至60 d时黏度保留率为70%左右,在110℃的热稳定性较好。此体系具有一定的封堵高渗透大孔道的能力,对于渗透率为(119～306)×10^(-3) μm^2的岩心,此调驱体系的封堵率均在90%以上,但堵而不死,可动性也较强,具有驱替基质中原油的潜力。

In view of the poor thermostability of profiling agent made from low major raw material for synthesizing thermostable profiling agent was selected, and crosslinking the optimum polymer, one formulation of the thermostable profile modification system was identified through experimental selection： 1 500 mg/L of polymer ＋ 500 mg/L of phenolic resin crosslinker ＋ 20 mg/L of organic chrome crosslinker ＋ 100 mg/L of salt thermal stabilizer ＋ 100 mg/L of deoxidizer. Secondary crosslinking technology was used for the preparation of the profile modification system, which can be stable at up to 100 to 110℃ for this reason. Experiment results have shown that the gelation time of the profiling strength of the gel is higher than 10 000 mPa.s at the agent reduces as the temperature increases, and the temperature of 80 to 110 ℃. During the aging process of the profile modification system at 110 ℃ after gelling , the viscosity reduces as the time increases. The viscosity retention percent is 70% after 60 days of aging, indicating that the thermalstability of the profile modification system is good at 110 ℃. The profile modification system is capable of plugging big channels of high permeability to some extent, and the plugging rate of this profile modification system is higher than 90% for the core with the permeability of 119 × 10^-3 to 306 × 10^-3. However, the plugging is not complete, the profile modification system is of strong mobility as well, and it has the potential of being used for displacing the crude oil in the substrate.