新型三元复合驱分压注入工具数值模拟与实验研究

发布时间：2018-07-03 03:33

本文选题：三元复合驱 + CFD　；参考：《东北石油大学》2017年硕士论文

【摘要】：大庆油田主力油层已聚驱结束,驱替对象转为二、三类油层,由于其非匀质性强、层间差异大,采用笼统注入方式导致动用程度差,驱油效率低。三元复合驱分层注入工艺有效解决这一问题,提高整体开发效果,改善层间矛盾。若采用水驱、聚驱分注工具,三元复合体系机械降解率大。因此,研究开发高节流压差、低粘度损失的三元复合驱分注工具尤为重要。针对以上问题,本文开展对三元复合驱分压注入工具研究,通过改变降压槽内部结构及优化结构参数,显著提高分压注入工具经济适用性。本文应用FLUENT数值模拟方法在原环形分压注入工具的基础上,设计出新型分压注入工具结构,并通过压力场、速度场、湍动能分布、视粘度分布以及应变率分布对比两种工具工艺性能的优良,优选新型结构。针对新型分压注入工具,引入正交试验设计,以结构参数:降压槽外径、槽间距、前槽间角以及后槽间角为试验因素,设计出4因素3水平9组正交试验。根据数值模拟结果,结合综合平衡法和方差分析法,确定结构最优参数组合。此外,通过室内实验研究进一步测定三元复合溶液流经新型分压注入工具前后的压力值和粘度值,分析降压槽外径、槽间距及槽数对节流压差和粘损率的影响规律。通过以上研究,充分验证新型分压注入工具工艺性能优越,对油田开采具有重要的指导意义。
[Abstract]:The main reservoir of Daqing oil field has been closed by polymer flooding, and the displacement object is changed into two or three types of reservoirs. Because of its strong heterogeneity and great difference between layers, the general injection method leads to poor production degree and low oil displacement efficiency. The ASP flooding technology can effectively solve this problem, improve the overall development effect and improve the interlayer contradiction. If water flooding and polymer flooding are used, the mechanical degradation rate of ASP system is high. Therefore, it is very important to develop ASP flooding tools with high throttling pressure difference and low viscosity loss. In order to solve the above problems, this paper studies the pressure dividing injection tools for ASP flooding. By changing the internal structure and optimizing the structural parameters of the pressure relief tank, the economic applicability of the pressure distribution injection tool is improved significantly. In this paper, based on the original annular partial pressure injection tool, a new type of partial pressure injection tool structure is designed by using fluent numerical simulation method, and the distribution of pressure field, velocity field and turbulent kinetic energy is obtained by means of pressure field, velocity field and turbulent kinetic energy distribution. Compared with the apparent viscosity distribution and the strain rate distribution, the new structure is selected. The orthogonal test design was introduced to the new pressure dividing injection tool. Taking the structural parameters such as the external diameter of the depressurized trough, the spacing of the groove, the angle between the front slot and the rear slot as the test factors, 9 groups of orthogonal experiments were designed at 4 factors and 3 levels. According to the numerical simulation results, combined with the comprehensive equilibrium method and the variance analysis method, the optimal structure parameter combination is determined. In addition, the pressure and viscosity of the ASP solution before and after flowing through the new pressure injection tool were further measured through laboratory experiments, and the effects of the external diameter, the spacing and the number of channels on the pressure difference and the viscosity loss rate of the depressurized slot were analyzed. Through the above research, it is fully proved that the new pressure-dividing injection tool has superior technological performance and has important guiding significance for oilfield production.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE934

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