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油田试验已经证明可以通过注入胶态分散凝胶(CDG)来提高原油采收率。这些试验的油藏特征表现出渗透率高、非均质性强和注入水的矿化度低等特征。在非均质油藏中应用CDG方法,提高原油采收率归结于改善水驱的波及效率。当前的研究介绍了CDG在高矿化度油藏特别是在北海油田的应用。较早涉及到CDG的实验室研究和油田试验都是在低的油藏温度和注入水矿化度(约5000μg/g)条件下进行的。这项研究涉及到较高的实验温度(85℃)和较高的矿化度(约35000μg/g)。交联结束后的CDG溶液黏度比相应的聚合物溶液黏度低,但它在高温下却比相应的聚合物溶液更稳定。在油田试验之前,室内研究了几组岩心流动实验为其提供准备。注入的CDG有效地增加了原油的采出程度。在线性流的岩心实验中,水驱后平均40%的剩余油通过注入CDG被采出,微观的分流机理可解释这些结果。CDG作为提高采收率方法之一,既能起到微观分流作用,又能提高宏观波及能力。
Oilfield trials have shown that oil recovery can be enhanced by injecting colloidal dispersion gels (CDGs). The reservoir characteristics of these experiments show high permeability, high heterogeneity and low salinity of injected water. Applying CDG in heterogeneous reservoirs to improve oil recovery is due to improved sweep efficiency. The current study describes the use of CDG in highly salinized reservoirs, especially in the North Sea. Laboratory studies and field trials involving CDG earlier have been conducted at low reservoir temperatures and water salinity (about 5000 μg / g). The study involved higher experimental temperatures (85 ° C) and higher salinity (about 35,000 μg / g). The viscosity of the CDG solution after crosslinking is lower than that of the corresponding polymer solution, but it is more stable at elevated temperatures than the corresponding polymer solution. Before the field experiment, several sets of core flow experiments were studied indoors to prepare for it. Injected CDG effectively increases the recovery of crude oil. In core-flow core experiments, an average of 40% of the residual oil after waterflooding is recovered by injection into the CDG, and microscopic diversion mechanisms explain these results. CDG as one of the methods to improve oil recovery, both to play the role of micro-diversion, but also improve the ability of macro wave.