Study On Mechanism Of Injection-production Cycle And Mathematical Modeling

Mechanism of injection-production cycle and mathematical model study are following the four kinds of water injection and oil production : Stable water-Stable exploitation; Stable water-Cycle extract; cyclicwaterflooding-Stable exploitation; cyclicwaterflooding-Cycle extract, we study mechanism of injection-production cycle in detail and establish integrated mathematical model.In this paper, we study in a deep-going way the source of additional pressure difference, form and function ,Demonstrated additional pressure difference is the presence of a disturbance wave, conduct a comprehensive study for the conventional injection, periodic water, and cycle oil injection of the mechanism, In the case of a stable injection, Density difference between oil and water produced by the force of gravity and the oil-water two phases the role of capillary force, so that oil and water movement in the vertical and produce vertical balance, Potential difference without taking into account, the level of vertical reservoir permeability layers between segments of each phase pressures are equal, In the case of injection-production cycle, Capillary force and elastic force caused by interlayer crossflow, Capillary force can cause high and low permeability layers bit reverse flow between the oil-water exchange, Elastic force in stopping the initial injection and stop mining can cause oil and water from low-permeability layers with high permeability layer to the channeling flow, In the re-injection and the early resumption of mining can cause oil and water from high-permeability layers with low permeability layers to the channeling flow, Cyclical changes in pressure field can activate additional"dead oil", Predecessors has been studied on the basis of the physical model based on Darcy's law and mass conservation principle to establish mathematical model , Model took into account the capillary force, the additional pressure difference and the effect of gravity, and boundary conditions are attached to form a complete mathematical model , With the dimensional analysis method to validate its correctness, discrete partial differential equations of conventional injection, weekly injection stability mining, mining and stable injection-week cycle of injection and establish difference model, and simplify the processing to be differential equations.This paper studies the cycles and cycle injection oil seepage and its relationship with the law of the distinction between conventional injection, based on percolation theory show that the movement of underground reservoir ,which has a comparative analysis on cyclical disturbances and conventional oil-water flows .In this paper, studing the cycle of injection, the cycle oil recovery mechanism and model by the additional pressure of pressure waves generated by disturbances, For the first time the article study the cycle of injection mechanism and model for cycle of injection and production in oil field development and provide a theoretical basis for further applications.