水驱油藏波及特征研究

发布时间：2018-04-19 04:29

本文选题：水驱油藏 + 波及特征　；参考：《中国石油大学(华东)》2015年硕士论文

【摘要】：水驱是目前广泛应用的油藏开发方式,在油藏特征和水驱开发方式不变的情况下,油藏驱油效率为定值。采收率定义为波及系数与驱油效率的乘积,当波及系数极高时,继续水驱将很难大幅度提高采收率。但矿场开发实践证实,在水驱开发方式不变的条件下,特高含水期油藏平面和纵向波及系数极高,继续水驱却仍能较大幅度提高采收率,这与传统认识相矛盾。因此,有必要对水驱油藏波及特征进行研究,建立新的波及评价方法,从而为制定开发措施提供技术依据。本文提出一套新的评价水驱油藏波及的方法,定义了孔隙波及程度与多孔介质驱油效率的概念,并在此基础上,从孔隙尺度、井组尺度及油藏尺度上对水驱油藏波及特征进行了研究。首先利用格子Boltzmann方法中的伪势模型,对单孔隙和多孔单元内的水驱油过程进行模拟,研究了其在不同润湿性及驱替压力梯度下的波及特征。随后建立井组尺度的数值模拟概念模型,对存在注采差异、平面非均质及纵向非均质情况的井组波及特征进行了研究,并与传统方法进行了对比。最后选取实际油藏的数值模拟模型,研究了存在断层及注采井网不完善等情况下油藏的波及特征。模拟研究发现,当多孔单元亲水性较强时,注入水能进入较小的孔隙和喉道内,孔隙波及程度较高;当多孔单元亲油性较强时,注入水沿孔隙中心部位突入,孔隙波及程度相对较低。随着驱替压力梯度和注入孔隙体积倍数的增大,孔隙波及程度逐渐增加。井组和油藏实际均由无数个微小的多孔单元组成,井组内的注采差异、平面非均质及纵向非均质,以及油藏的构造、井网不完善等均影响了每个多孔单元的孔隙波及程度,从而使其呈现不同的波及特征。
[Abstract]:Water flooding is a widely used reservoir development method at present. When the reservoir characteristics and water drive development mode remain unchanged, the reservoir displacement efficiency is constant.Oil recovery is defined as the product of sweep efficiency and oil displacement efficiency. When the sweep efficiency is very high, it is difficult to improve oil recovery by water flooding.But the practice of mine field development proves that under the condition of constant water drive development mode, the reservoir plane and vertical sweep coefficient are very high in the very high water cut period, but the oil recovery factor can still be greatly improved by continuing water flooding, which contradicts the traditional understanding.Therefore, it is necessary to study the swept characteristics of water-drive reservoirs and establish a new method of sweep evaluation, thus providing technical basis for the formulation of development measures.In this paper, a new method for evaluating water drive reservoir sweep is proposed, and the concepts of pore sweep degree and oil displacement efficiency in porous media are defined.The sweep characteristics of water-drive reservoirs are studied on well scale and reservoir scale.Firstly, the pseudopotential model of lattice Boltzmann method is used to simulate the water flooding process in single pore and porous unit, and its sweep characteristics under different wettability and displacement pressure gradient are studied.Then the numerical simulation conceptual model of well group scale is established, and the sweep characteristics of well group with different injection-production difference, plane heterogeneity and longitudinal heterogeneity are studied and compared with traditional methods.Finally, selecting the numerical simulation model of the actual reservoir, the sweep characteristics of the reservoir in the presence of faults and imperfect injection-production pattern are studied.The simulation results show that when the hydrophilicity of the porous unit is strong, the injected water can enter the smaller pore and throat, and the pore sweep degree is higher, and when the hydrophilicity of the porous unit is stronger, the injected water penetrates along the center of the pore.The pore sweep degree is relatively low.With the increase of displacement pressure gradient and pore volume multiple, the pore sweep degree increases gradually.Well groups and reservoirs are actually made up of countless tiny porous units. The differences between injection and production, plane heterogeneity and longitudinal heterogeneity, reservoir structure and well pattern imperfection all affect the pore sweep degree of each porous unit.So that it presents different sweep characteristics.
【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】：TE357.6

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