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混相气水交替注入已在世界上很多油田实施,同时开展了大量的数值模拟来研究速度、重力、段塞尺寸、非均质性对气水交替的影响。本文报道了在玻璃珠人造岩心的模型上进行的一系列气水交替驱替试验的研究结果,研究中使用玻璃珠人造岩心是为了能够直观地观察每个气水交替试验过程中流体的相互作用。一系列的间接混相气水交替驱油试验是按气水比分别为1∶1、4∶1、1∶4进行的。在一定的流速范围内完成这些试验以研究毛管数对驱油效率的影响,并把它们的驱替动态与水驱和简单的混相驱试验相比较。结果表明驱油效率是速度和气水比的函数,还发现模拟用油水和溶剂水相对渗透率是不同的,尽管事实上油和溶剂是一次接触混相。如果这一结论对油藏流体成立的话,则清楚地表明一次接触混相将影响气水交替驱油效率的预测。
Alternate mixing of gas and water has been carried out in many oilfields in the world. At the same time, a large number of numerical simulations have been carried out to study the effects of velocity, gravity, slug size and heterogeneity on gas-water alternation. In this paper, we report the results of a series of experiments on alternating displacement of gas and water on a model of glass bead man-made core using glass bead artificial cores in order to be able to visually observe the fluid interaction during each gas-water alternating test . A series of indirect mixed gas-water displacement tests were conducted at gas-water ratios of 1: 1, 4: 1 and 1: 4, respectively. These tests were performed at a range of flow rates to investigate the effect of capillary numbers on flooding efficiency and to compare their displacement dynamics with waterflooding and simple miscible flooding experiments. The results show that flooding efficiency is a function of velocity and gas-water ratio, and also shows that the relative permeability of simulated and solvent water is different, despite the fact that the oil and solvent are in one contact phase. If this conclusion is valid for reservoir fluids, it is clear that a single contact with a miscible phase will affect the prediction of alternate displacement of gas and water.