普通稠油水驱后转高压蒸汽驱机理及技术界限研究

发布时间：2018-05-14 07:42

本文选题：数值模拟 + 油层加热　；参考：《中国石油大学(华东)》2015年硕士论文

【摘要】：蒸汽驱是一种能够改善水驱普通稠油油藏波及系数并提高其洗油效率的驱替方式。普通稠油油藏水驱后转蒸汽驱时通过对油层加热,可以降低原油粘度和流度比,同时蒸汽的超覆作用可以有效动用水驱后的顶部剩余油,提高油藏的波及程度,从而大幅度提高普通稠油油藏的采出程度。针对孤岛油田中二中Ng5先导试验区普通稠油埋藏较深,长期水驱造成油层压力高(吞吐降压后仍在7MPa左右)、含水率高,不适于水驱后转蒸汽驱开发的问题,本文运用油藏数值模拟技术,优化了水驱转蒸汽驱的井网形式和注汽参数,研究了水驱普通稠油油藏转高压蒸汽驱的可行性,提出了“等容同效”的概念,并通过孤岛油田中二中Ng5先导试验区的矿场实践验证了高压蒸汽驱具有较好的开发效果。为确定地层压力和蒸汽干度对水驱普通稠油油藏转高压蒸汽驱开发的影响规律,从油层加热和蒸汽扩展两方面研究了普通稠油水驱后转高压蒸汽驱的机理:通过热传递规律、温度前缘移动和平面、纵向温度场分布等研究了地层压力、蒸汽干度和转驱的含水率时机对蒸汽加热油藏的影响;通过含气饱和度前缘移动、蒸汽腔体积和平面、纵向含气饱和度场分布研究了地层压力和蒸汽干度对蒸汽在油层中扩展的影响。最后研究了不同油藏静态参数和动态参数对油层加热和蒸汽扩展两方面机理的影响规律。为确定普通稠油油藏水驱后转高压蒸汽驱开发的参数适应性界限,运用油藏数值模拟手段研究了不同油藏静态参数和动态参数对水驱普通稠油油藏转高压蒸汽驱开发效果的作用规律,并对这些影响因素进行了敏感性分析。在不同油藏静态参数对水驱普通稠油油藏转高压蒸汽驱开发效果的作用规律研究的基础上,结合动态经济评价方法,建立了水驱普通稠油油藏转高压蒸汽驱的油藏参数适应性界限和油价边界。
[Abstract]:Steam flooding is a kind of displacement method which can improve sweep efficiency and oil washing efficiency of water drive common heavy oil reservoirs. The viscosity and mobility ratio of crude oil can be reduced by heating the reservoir after water flooding and steam flooding. At the same time, the overlying effect of steam can effectively produce the remaining oil at the top of the reservoir after water flooding and improve the sweep degree of the reservoir. Thus, the recovery degree of ordinary heavy oil reservoir is greatly improved. In view of the deep burial of common heavy oil in the pilot area of Zhong-2 Ng5 pilot area in Gudao Oilfield, long term water flooding has resulted in high reservoir pressure (the reservoir pressure is still around 7MPa after stimulation and lowering pressure, and the water cut is high, so it is not suitable for the development of steam drive after water flooding. In this paper, the well pattern and steam injection parameters of water drive to steam drive are optimized by using reservoir numerical simulation technology. The feasibility of water drive heavy oil reservoir to high pressure steam flooding is studied, and the concept of "equal capacity and same effect" is put forward. The high pressure steam drive is proved to have good development effect through the field practice in the pilot area of the second middle Ng5 in Gudao Oilfield. In order to determine the influence of formation pressure and steam dryness on the development of high pressure steam flooding in water driven heavy oil reservoirs, the mechanism of high pressure steam flooding after water flooding of common heavy oil is studied from the aspects of reservoir heating and steam expansion. The influence of formation pressure, steam dryness and water cut of transposition on steam heating reservoir is studied by temperature front moving and plane and longitudinal temperature field distribution. The effects of formation pressure and steam dryness on the expansion of steam in reservoir are studied in the longitudinal distribution of gas saturation field. Finally, the influence of static and dynamic parameters on reservoir heating and steam expansion is studied. In order to determine the limits of parameter adaptability for the development of high pressure steam flooding after water flooding in common heavy oil reservoirs, The effects of static and dynamic parameters of different reservoir on the development effect of high pressure steam flooding in water-driven heavy oil reservoirs are studied by using reservoir numerical simulation method, and the sensitivity of these influencing factors is analyzed. On the basis of the study on the effect of static parameters of different reservoirs on the development effect of high pressure steam flooding in water drive common heavy oil reservoirs, combined with the method of dynamic economic evaluation, The limits of reservoir parameter adaptability and oil price of water drive heavy oil reservoir converted to high pressure steam flooding are established.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357.44

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