A method for quantitatively dividing remaining oil of an oil field in a high water cut period

Abstract

The invention belongs to the technical field of oil exploitation, and particularly relates to a method for quantitatively dividing remaining oil of an oil field in a high water cut period, which comprises the following steps of: 1, determining remaining oil outside an overall control range which is not influenced by a well in a horizon according to a well-to-well communication relationship and a pressure distribution condition, and dividing the remaining oil into well network control incapable remaining oil; 2, dividing the water injection intensity into water absorption difference type residual oil when the water injection intensity is smaller than the whole average water injection intensity and the single well control area is smaller than the average single well control area; 3, screening out one third of the production well and the injection well with higher corresponding stratum permeability, analyzing the liquid production amount and the water injection amount of the production well and the injection well, and dividing the liquid production amount of the corresponding stratum into interlayer interference type remaining oil if the liquid production amount of the corresponding stratum can reach half of the water absorption amount; 4, finding out residual oil only in the control range of the production well or the injection well, and dividing the residual oil into injection-production imperfect residual oil; 5, If after step 1-4, the remaining oil that has not been distinguished, classifying the remaining oil as a planar heterogeneous residual oil..

Description

Technical field: [0001] The invention belongs to the technical field of petroleum exploitation, and in particular relates to a method for quantitatively dividing remaining oil in an oil field during a high water-cut period. Background technique: [0002] At present, the vast majority of oil fields in my country are already in the period of high water cut, and the difficulty of crude oil extraction is increasing day by day, while the degree of recovery is relatively low. How to further improve oil recovery has become the focus of oilfield development tasks. Fully grasping the distribution of remaining oil is conducive to the subsequent development and adjustment of oilfields in high water-cut periods, and further taps the remaining oil in the reservoir, thereby improving oil recovery. Therefore, the most critical task is how to realize quantitative division of remaining oil distribution simply and quickly. The distribution of remaining oil is affected by many factors, which ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to propose a method for quantitatively dividing the remaining oil in the high water-cut period of the oilfield, so as to solve the problems in the above-mentioned background technology that the division method has a large workload, great influence of subjective factors, low division efficiency, and poor accuracy.

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