特高含水期微觀剩余油啟動條件及油膜變形機理研究
[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.
【學(xué)位授予單位】:西南石油大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TE327
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