自乳化深部调驱体系研制与性能评价
发布时间：2018-11-12 11:44
【摘要】：我国的不少油田也相继进入了开发的中后期,产水率增加,产油率快速下降,经过一次采油、二次采油和三次采油油藏中仍有仍有40%~60%左右的剩余油。可见,提高采收率的途径需要寻找新的方法驱油。由于毛细管阻力等因素的作用,油藏中的残余油不容易渗流通过岩石中很小的毛细管,这种流动体系使油相的相对渗透率较低,残余油增加,导致原油采收率降低。如果我们能使地下的原油就地自发乳化,使原油变成粒径小于多孔介质孔喉直径的乳状液,那么油相就非常容易地通过岩石中的毛细管,使残余油饱度下降,从而提高原油采收率。针对胜利油藏地质条件,本文筛选优化出一种自发乳化调驱体系,并对该体系进行了界面张力、油膜收缩性能、洗油砂性能、自渗吸性能等性能评价,同时开展了室内物模驱油试验研究。研究结果表明:实验温度为80℃时,自乳化体系2000 mg/L Z1+2000mg/L A2在轻微外力作用下,不需要达到超低界面张力,即可与原油发生乳化,将油滴从油砂中清洗出来,形成的乳状液滴平均粒径为15μm,在显微镜下可观察到明显的液滴聚并和桥接现象。通过室内物模驱油试验,得出:该体系在水驱至含水98%后,仍可大幅度提高采收率,采收率增值仍然大于20%。
[Abstract]:Many oilfields in our country have entered the middle and late stage of development one after another. The water production rate increases and the oil production rate decreases rapidly. After the first oil recovery, the secondary oil recovery and the tertiary oil recovery reservoir, there are still 40% or 60% of the remaining oil. Therefore, the way to improve oil recovery needs to find a new way to drive oil. Because of the effect of capillary resistance, the residual oil in the reservoir is not easily percolated through the small capillary in the rock. This flow system makes the relative permeability of the oil phase lower and the residual oil increase, resulting in the decrease of oil recovery. If we can make the underground crude oil spontaneously emulsify in situ and turn the crude oil into an emulsion with a diameter smaller than the diameter of the pore throat of the porous medium, then the oil phase will very easily pass through the capillary tube in the rock and reduce the saturation of the residual oil. In order to improve oil recovery. According to the geological conditions of Shengli reservoir, a spontaneous emulsification and flooding system was selected and optimized, and the interfacial tension, oil film shrinkage, oil sand washing and self-permeability were evaluated. At the same time, the laboratory model oil displacement test was carried out. The results show that when the experimental temperature is 80 鈩，
本文编号：2327017
[Abstract]:Many oilfields in our country have entered the middle and late stage of development one after another. The water production rate increases and the oil production rate decreases rapidly. After the first oil recovery, the secondary oil recovery and the tertiary oil recovery reservoir, there are still 40% or 60% of the remaining oil. Therefore, the way to improve oil recovery needs to find a new way to drive oil. Because of the effect of capillary resistance, the residual oil in the reservoir is not easily percolated through the small capillary in the rock. This flow system makes the relative permeability of the oil phase lower and the residual oil increase, resulting in the decrease of oil recovery. If we can make the underground crude oil spontaneously emulsify in situ and turn the crude oil into an emulsion with a diameter smaller than the diameter of the pore throat of the porous medium, then the oil phase will very easily pass through the capillary tube in the rock and reduce the saturation of the residual oil. In order to improve oil recovery. According to the geological conditions of Shengli reservoir, a spontaneous emulsification and flooding system was selected and optimized, and the interfacial tension, oil film shrinkage, oil sand washing and self-permeability were evaluated. At the same time, the laboratory model oil displacement test was carried out. The results show that when the experimental temperature is 80 鈩，
本文编号：2327017
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