压裂用黏土稳定剂的筛选及室内评价研究

Screening and Laboratory Evaluation of Clay Stabilizers for Fracturing

油田开发过程中,粘土矿物容易发生膨胀和运移,为了减少对储集层渗透率的伤害,需要在压裂液中加入粘土稳定剂。本文根据粘土稳定剂的分类和特点,进行体积压裂用粘土稳定剂的筛选试验,确定评价粘土稳定剂的标准和评价方法,研究温度和加热时间对粘土稳定剂的防膨效果的影响,以及对粘土稳定剂的耐水洗性能的评价,从而对粘土稳定剂进行筛选。研究表明:可以采用离心法测定防膨率,可知无机盐类中氯化钾的防膨效果最好,但是长效性差;有机类中聚二甲基二烯丙基氯化铵与乙二胺盐酸盐防膨效果较好。温度及加热时间对粘土稳定剂的防膨效果的影响较小。耐水洗实验方法大体可以说明无机类耐水洗性差,有机类较好;但是其室内评价方法还有待于研究。

The clay is easily to expand and migrate in oilfield development process, in order to reduce the damage to reservoir permeability, clay stabilizer need be added in the fracturing fluid. In this paper, based on classification and characteristics of clay stabilizer, clay stabilizers for volume fracturing were screened ,and the evaluation criteria and evaluation methods of clay stabilizer were determined .Influence of temperature and heating time on anti-swelling effect of clay stabilizer was studied, and washable performance of clay stabilizer was evaluated, at last suitable clay stabilizer was screened out. Research results show that, anti-swelling of potassium chloride in inorganic salt clay stabilizers is the best, but its long-term effect is poor; in organic clay stabilizers, anti-swelling rates of poly dimethyl diallyl ammonium chloride and 1,2-ethanediamine dihydrochloride are good. The temperature and heating time have less effect on the anti-swelling rate of. Washable experimental results show that, washable performance of inorganic clay stabilizer is poor, washable performance of organic clay stabilizer is better.