特高含水期微观剩余油启动条件及油膜变形机理研究

发布时间：2018-07-17 16:19

【摘要】：随着注水开发油田进入特高含水阶段,剩余油赋存状态、分布情况较之前发生了较大的变化,在中低含水期的一些开采理论已不适用于特高含水时期的实际开采,对特高含水期的剩余油进行合理的划分,决定了之后研究对象及其研究的复杂程度。特高含水期微观剩余油的动力由原来的驱替压力为主变为微观粘滞剪切力为主导,将剩余油微观状态的受力分析清楚直接关系着微观剩余油启动条件的确定。特高含水期剩余油滴启动条件及油膜变形机理研究对提高油田开发经济效益,保持油田的稳产、增产具有重要的意义。首先,本文阐述研究的必要性,明确了本文的研究目的及意义,追踪了研究过程及现状,给出了本文的主要研究内容、所采用的方法、原理及技术路线,最后给出了本文的创新点。综合调研情况及已知知识,分析总结了特高含水期剩余油的存在状态情况,将剩余油划分为油滴、油膜、片状油三种存在状态,并对三种状态的剩余油进行了受力分析。考虑了各种状态下剩余油的微观受力:浮力、毛细管力、重力、黏滞力、附加阻力、摩擦阻力及贾敏效应阻力等的作用,根据流体静力学与动力学知识建立了剩余油的状态方程。其次,在建立的各种状态下剩余油受力状态方程基础上,对剩余油的受力进行了敏感性分析,最终找出了对剩余油作用最为敏感的作用力即为影响剩余油状态的主要作用力,在此基础上分析了剩余油膜微观受力特征,运用微元思想并结合流体静力学与动力学知识对亲水型毛管壁剩余油膜各层的受力状态进行分析,提出了油膜的变形机理,在理论上得出了油膜变形的极限即破裂的初始点。本文在剩余油分布规律基础上将特高含水期剩余油分为油滴、油膜、片状油三种赋存状态,分析了各种状态剩余油在孔道附近的运移情况,根据剩余油在受不同作用力状况下的运动状况得出了特高含水期剩余油的孔道选择机理。最后,结合剩余油膜变形机理、剩余油的孔道选择理论及水驱油核磁实验针对特高含水期各种状态下剩余油的分布及受力情况,本文提出了剩余油启动的定义,并给出了各种分布状态下剩余油的启动条件。
[Abstract]:With the development of water injection oilfield entering the stage of super high water cut, the state of remaining oil exists and the distribution of remaining oil has changed more than before. Some production theories in the middle and low water cut period are not suitable for the actual exploitation in the period of extra high water cut. The reasonable division of the remaining oil in the super high water cut period determines the later research object and the complexity of the study. The dynamic force of the micro residual oil changed from the original displacement pressure to the micro viscous shear force in the super high water cut period. The mechanical analysis of the micro state of the remaining oil is directly related to the determination of the starting conditions of the micro residual oil. The study on the starting conditions of remaining oil droplets and the mechanism of oil film deformation in ultra-high water cut stage is of great significance in improving the economic benefit of oilfield development, maintaining the stable production of oil fields and increasing production. First of all, this paper expounds the necessity of the research, clarifies the purpose and significance of the research, tracks the research process and current situation, and gives the main research contents, methods, principles and technical routes of this paper. Finally, the innovation points of this paper are given. Based on the investigation and the known knowledge, this paper analyzes and summarizes the existing state of the remaining oil in the super high water cut period, divides the remaining oil into three existing states: oil droplet, oil film and flake oil, and analyzes the stress of the remaining oil in the three states. The effects of micro forces on the remaining oil in various states, such as buoyancy, capillary force, gravity, viscous force, additional resistance, friction resistance and resistance of the Jamin effect, are considered. According to the knowledge of hydrostatics and dynamics, the equation of state of remaining oil was established. Secondly, on the basis of the state equations of the remaining oil under various conditions, the sensitivity of the remaining oil to the force is analyzed, and the most sensitive force to the residual oil is found out, that is, the main force that affects the state of the remaining oil. On this basis, the microcosmic stress characteristics of the remaining oil film are analyzed, and the stress state of the remaining oil film of the hydrophilic capillary wall is analyzed by using the micro-element thought and hydrostatic and dynamic knowledge, and the deformation mechanism of the oil film is put forward. The limit of oil film deformation is obtained theoretically, that is, the initial point of fracture. On the basis of the distribution of residual oil, the remaining oil in super high water cut period is divided into three kinds of existing states: oil droplet, oil film and flake oil. The migration of remaining oil in various states near the pore channel is analyzed. According to the movement of residual oil under different forces, the mechanism of pore selection of residual oil in super high water cut period is obtained. Finally, according to the mechanism of residual oil film deformation, the pore selection theory of remaining oil and the nuclear magnetic field experiment of water drive oil, this paper puts forward the definition of remaining oil starting according to the distribution and stress of remaining oil in various states of super high water cut period. The starting conditions of the remaining oil in various distribution states are also given.
【学位授予单位】：西南石油大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE327

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