High-water-content oil reservoir residual oil diving method

Abstract

The invention relates to a high-water-content oil reservoir residual oil diving method. The method comprises the steps of determining an oil reservoir flow field quantitative characterization method by analyzing flow field geological main control factors of different oil reservoirs, further determining an initial flow field distribution rule and mode, analyzing a dominant flow field distribution rule and mode by combining development dynamics and other oilfield development later-stage data, and finally utilizing the dominant flow field-mode to analyze the dominant flow field distribution rule and mode; adopting a dominant flow field-initial flow field difference method to find residual oil, and exploiting the residual oil. According to the high-water-content oil reservoir remaining oil diving method provided by the invention, on the basis of oil reservoir classification, the influence of reservoir heterogeneity and structural characteristics on an initial flow field is deeply analyzed, and by re-analyzing the oil reservoir flow field in the later development stage, a dominant flow field is compared with the dominant flow field. The initial flow field forms a knowledge of a region beneficial to the distribution of residual oil in the later period of development, potential residual oil is dug in a targeted manner, the utilization degree and the final recovery ratio of the out-of-control reserves of the oil reservoir are improved, the oil field yield decreasing amplitude is effectively reduced, and the final recovery ratio of the oil reservoir is obviously improved.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field development, and in particular relates to a method for tapping the remaining oil potential of high water-cut oil reservoirs. Background technique [0002] (1) Meaning of reservoir flow field [0003] The static distribution characteristics and dynamic changes of fluids and fluid storage spaces in reservoirs are collectively referred to as reservoir flow fields. The dominant flow field generally means that the flow field strength in the porous medium body is significantly higher than that in the adjacent medium body with the same volume. The obvious characteristic of the dominant flow field is that the fluid conductance between injection and production wells is large, and the ratio of the fluid conduction between wells to the swept volume of injection wells is also large. In addition, it may also be accompanied by the characteristics of fast fluid flow rate, large water injection multip...

AI Technical Summary

Problems solved by technology

[0011] The existing technology lacks the research on the initial flow field of undeveloped oil reservoirs, and the lack of understanding of the flow field changes in the remaining oil distribution area, which seriously affects the adjustment of oil and gas field development technology policies in the middle and later stages of development and the potential tapping of remaining oil

Judging from the current research situation at home and abroad, there are relatively few evaluation methods for the initial flow field in the undeveloped period, and it is difficult to evaluate multiple factors affecting the initial flow field at the same time; at the same time, for late-stage reservoirs, there is a lack of combination of dynamic characteristics and other factors. Method of Comprehensive Analysis of Production Data

Images