普通稠油多元热流体驱提高采收率机理及技术筛选研究

发布时间：2018-08-03 18:08

【摘要】：胜利油田孤岛中二中Ng5区块由于埋藏深,地层压力高,不适合蒸汽驱,而多种气体和化学剂辅助热力采油技术已被实验和数值模拟技术证明是开发该类油藏的有效开发方式。本文运用实验方法和数值模拟手段,模拟了二氧化碳、氮气泡沫、降粘剂组合辅助热水驱(多元热流体驱)提高采收率技术,详细分析了其提高采收率机理,并且建立了多元热流体驱油藏筛选标准,对该技术的推广应用以及进一步提高稠油油藏采收率具有重要意义。基于实验拟合和历史拟合所获得的气体和化学剂参数以及油藏地质参数,建立了典型区块数值模拟模型,分析了不同多元热流体驱开发方式开发效果。从提高采收率效果角度,对不同气体和化学剂的单独注入方式进行优化,运用正交实验设计方法对气体化学剂组合注入方式进行了优化;通过对优化结果的对比分析,发现泡沫和降粘剂组合辅助热水开发方式比泡沫、降粘剂单独辅助热水驱二者提高采收率总和更高,而二氧化碳和降粘剂组合辅助热水驱开发方式则是相反的效果,说明调剖后气体和化学剂在复合驱中才具有更强的复合增效作用。基于数值模拟技术,从受效剩余油分布角度分析了其提高采收率特征。从注入气体及化学剂分布和运移、温度分布以及热流体对原油降粘角度,研究了多元热流体驱提高采收率机理。认为单纯CO2与单纯降粘剂作用时,对原油的降粘效果无法对提高采收率做出明显贡献,而其它组合方式下,CO2和降粘剂的降粘能力均能得到充分发挥;在泡沫的作用下,添加剂的运移在动用剩余油方面起到了最主要的贡献,泡沫与降粘剂共同作用下油藏受热效果虽然一定程度上低于单独泡沫时的贡献,但总体仍然大于单纯热水驱时的受热效果。为了获得多元热流体驱开发的油藏参数经济界限,对普通稠油油藏分别进行了不同多元热流体驱技术影响因素的敏感性分析。基于不同油藏参数多元热流体驱开发效果的影响规律,结合经济评价方法,建立了多种多元热流体驱技术的油藏参数适应性界限,从而方便根据油价动态指导多元热流体驱经济有效开发。
[Abstract]:Because of its deep burial and high formation pressure, Gudao Zhongzhong Ng5 block in Shengli Oilfield is not suitable for steam drive, and many kinds of gas and chemical auxiliary thermal oil recovery technology has been proved to be an effective way to develop this kind of reservoir by experiment and numerical simulation technology. In this paper, by means of experimental method and numerical simulation method, the enhanced recovery technology of carbon dioxide, nitrogen foam and viscosity reducer combined with hot water flooding (multicomponent thermal fluid flooding) is simulated, and the mechanism of enhanced recovery is analyzed in detail. The screening criteria for multicomponent thermal fluid flooding reservoirs are established, which is of great significance to the popularization and application of this technology and the further improvement of oil recovery in heavy oil reservoirs. Based on the parameters of gas, chemical agent and reservoir geology obtained by experimental and historical fitting, the numerical simulation model of typical blocks is established, and the development effect of different multi-element thermal fluid flooding methods is analyzed. In order to improve the recovery efficiency, the single injection methods of different gases and chemical agents are optimized, and the combination injection mode of gas chemical agents is optimized by orthogonal experimental design, and the optimized results are compared and analyzed. It is found that the combination of foam and viscosity reducer is more effective than foam in assisting hot water flooding, while the combination of carbon dioxide and viscosity reducer is the opposite. It shows that only after profile control gas and chemical agent have stronger compound synergism in compound flooding. Based on the numerical simulation technique, the characteristics of enhanced oil recovery are analyzed from the point of view of the distribution of effective residual oil. Based on the distribution and migration of injected gas and chemical agent, temperature distribution and viscosity reduction of crude oil by thermal fluid, the mechanism of enhanced recovery by multicomponent thermal fluid flooding is studied. It is concluded that the viscosity reduction effect of crude oil can not be significantly contributed to the oil recovery by the action of simple CO2 and viscosity reducer, but the viscosity reduction ability of CO _ 2 and viscosity reducer can be brought into full play under the effect of foam, and the viscosity reduction ability of CO _ 2 and viscosity reducer can be brought into full play under the effect of foam. The migration of additives plays the most important role in the use of remaining oil. The effect of reservoir heating under the combined action of foam and viscosity reducer is to some extent lower than that of single foam. However, the overall heating effect is still greater than that of pure hot water flooding. In order to obtain the economic limits of reservoir parameters for multicomponent thermal fluid flooding development, the sensitivity analysis of different influencing factors of multi-element thermal fluid flooding technology for common heavy oil reservoirs was carried out. Based on the influence of different reservoir parameters on the development effect of multivariate thermal fluid flooding, combined with the economic evaluation method, the limits of reservoir parameter adaptability of multiple thermal fluid flooding techniques are established. Therefore, it is convenient to guide the economic and effective development of multiple thermal fluid flooding according to the oil price dynamics.
【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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