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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。
During oilfield development, clay minerals tend to swell and migrate. To reduce the damage to reservoir permeability, clay stabilizers need to be added to the fracturing fluid. Based on the classification and characteristics of clay stabilizers, this paper conducts a screening test of clay stabilizer for volumetric fracturing to determine the criteria and evaluation methods for evaluating clay stabilizers. The effects of temperature and heating time on the anti-swelling effect of clay stabilizers and The clay stabilizer is screened for its resistance to washing with water. The results show that the centrifugal method can be used to measure the anti-swelling capacity. It can be seen that potassium chloride in inorganic salts has the best anti-swelling effect but poor long-lasting effect. In the organic type, polydimethyl diallyl ammonium chloride and ethylenediamine Hydrochloride anti-swelling effect is better. The effect of temperature and heating time on the anti-swelling effect of clay stabilizers is small. Washable test method can generally explain the poor washability of inorganic, organic class is better; but its indoor evaluation methods have yet to be studied.