A method for tapping remaining oil in high water-cut reservoirs

Abstract

The invention relates to a method for tapping the remaining oil potential of high water-cut reservoirs, which includes: determining the quantitative characterization method of the reservoir flow field by analyzing the main control factors of the flow field geology of different reservoirs, and then determining the distribution law and mode of the initial flow field, and then combining the The distribution law and mode of the dominant flow field are analyzed by analyzing the post-development data of the oilfield such as the development dynamics, and finally the remaining oil is found and exploited by using the method of the difference between the dominant flow field and the initial flow field. The method for tapping the potential of remaining oil in high water-cut reservoirs provided by the present invention, on the basis of reservoir classification, deeply analyzes the influence of reservoir heterogeneity and structural characteristics on the initial flow field, and reanalyzes and compares the reservoir flow field in the later stage of development. Predominant flow field-initial flow field, forming an understanding of favorable areas for the distribution of remaining oil in the later stage of development, tapping the remaining oil in a targeted manner, improving the degree of production and ultimate recovery of out-of-control reserves in the reservoir, and effectively reducing the decline in oilfield production , significantly improving the ultimate oil recovery.

Description

Technical field[0001]The present invention belongs to the field of oil and gas field development, and specific relates to a high water reservoir residual oil excavation method.Background technique[0002](1) The meaning of the reservoir flow field[0003]Static distribution characteristics of fluid and fluid storage space in the reservoir and its dynamic variation law generally refer to the reservoir flow field. Advantageous flow fields generally refer to the flow field strength in the porous medium is significantly higher than the flow field strength in adjacent media. The advantageous flow field is significantly characterized by a large amount of concentrated liquid, and the ratio of the well-formed fluid amount and the injection wave and the volume is also large. In addition, it is possible to accompany the fluid flow rate, high water injection, and high water content. The initial flow field refers to the flow of oil in the oil field.[0004](2) Status of research on reservoir flow in ...

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