Oil reservoir layered water injection efficiency evaluation method, medium, terminal and device

Abstract

The invention provides an oil reservoir layered water injection efficiency evaluation method, a medium, a terminal and a device. An oil reservoir system is simplified and represented as an interconnected node network considering a series of complex geological characteristics such as a well point, a water body and a fault; an inter-well communication network model represented by two inter-well communication parameters of conductivity and communication volume is constructed, a reservoir is simplified into a communication unit between a group of single wells, then the water injection splitting coefficient of a water injection well on each layer is calculated, and injection increase or injection decrease is performed according to the water injection efficiency of the water injection well on each layer and the average water injection efficiency of the same layer. According to the invention, the parameter dimension of the required solution is reduced; the calculation and fitting time is greatly reduced, and the splitting amount and the water injection efficiency of the water well in each communication unit can be directly calculated, so that the method has obvious advantages in evaluating the stratified water injection efficiency of the large oil reservoir, Meanwhile, the effects of relieving interlayer contradiction, regulating and controlling the stratified water injection well, improving the water injection efficiency and increasing and stabilizing the yield can be achieved.

Description

【Technical field】 [0001] The invention relates to the field of oil reservoir production, in particular to a method, a medium, a terminal and a device for evaluating the layered water injection efficiency of an oil reservoir. 【Background technique】 [0002] Water injection development is widely used in the secondary development stage of onshore oil reservoirs in my country. With the expansion of the injected water and the influence of reservoir heterogeneity, the flow field in the layer is constantly changing, resulting in water channeling and dead oil zones. And other issues. Accurate evaluation of the water injection efficiency of each water injection well is helpful to identify the corresponding relationship between injection and production between oil and water wells, and to determine a reasonable injection and production system, which is the key basic work for realizing the increase of reservoir production and efficiency. [0003] Commonly used water injection efficiency...

AI Technical Summary

Problems solved by technology

[0004] The present invention provides a layered water injection efficiency evaluation method, medium, terminal and device for oil reservoirs, which solves the above-mentioned technical problems of inaccurate water injection efficiency calculation results, complicated calculation process and long time consumption

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