A method for dividing dynamic flow units of reservoirs in ultra-high water-cut period

Abstract

The present invention relates to a method for realizing dynamic flow unit division in an extra-high water-cut period for water injection development reservoirs. The method includes: step (1): according to the existing phase permeability curves in the oilfield, the phase permeability curves under different absolute permeability are obtained by regression expression, and then calculate the water phase relative permeability of each grid point; step (2): calculate the water phase seepage coefficient, obtain the water phase relative permeability of each grid point from step (1), and calculate according to the definition of seepage coefficient The water phase seepage coefficient of each grid point in the model; step (3): determine the division boundary, draw the semi-logarithmic cumulative curve of the water phase seepage coefficient, find two parallel segments (the slope is small, almost 0) and The section with a larger slope between two parallel sections is used as the division boundary of the dynamic flow unit; step (4): determine the partition to which the grid belongs, and on the basis of the division boundary in step (3), the water phase seepage coefficient Carry out partition judgment, and then divide the flow unit.

Description

technical field [0001] The invention relates to the technical field of comprehensive adjustment of reservoirs for water injection development, in particular to a method for dividing flow units based on reservoir dynamic parameters after analyzing geological parameters after the reservoir enters an ultra-high water-cut period. Background technique [0002] At present, most oilfields in eastern my country have entered the stage of high water cut and ultra-high water cut. Under the situation that it is more and more difficult to find new reserve reserves and the reserve-production ratio is seriously out of balance, the development of remaining oil in old oilfields has become the sustainable development of old oilfields in eastern my country. major strategy. Revealing the quantity and distribution of remaining oil is an important basis for designing and optimizing water flooding development schemes and tertiary oil recovery schemes, while the quantity and spatial distribution of ...

AI Technical Summary

Problems solved by technology

A flow unit is defined as a reservoir that is continuously distributed in space and has similar petrophysical and seepage characteristics. The study of a flow unit is of great practical significance for analyzing the distribution of oil and water in the ground and predicting the distribution of remaining oil. However, as a geological Quantitative means of volume description, the existing flow unit division method does not well combine geology and reservoir, and cannot describe and solve the problem of ineffective driving in the later stage of development, and provide a basis for oilfield development adjustment

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