Medium and high permeability oil pool ultrahigh water content later low-cost equivalent water flooding method

Abstract

The invention provides a medium and high permeability oil pool ultrahigh water content later low-cost equivalent water flooding method. The medium and high permeability oil pool ultrahigh water content later low-cost equivalent water flooding method comprises the steps of: (1) evaluating the oil pool energy keeping condition; (2) evaluating the oil pool liquid production and water injection capacity and promotion potential; (3) evaluating the equivalent water flooding well distance range and the displacement pressure gradient; (4) establishing and performing the equivalent water flooding well pattern adjustment scheme; (5) evaluating the equivalent water flooding single well liquid production capacity and the production pressure difference; (6) establishing and performing the equivalent water flooding stratum pressure rising scheme; (7) establishing and performing the water channeling prevention scheme in the pressure recovery period; and (8) establishing and performing the oil well large liquid production scheme. The medium and high permeability oil pool ultrahigh water content later low-cost equivalent water flooding method exerts the stock oil water well effect to the greatest extent, can realize equivalent development effect to a dense well pattern on the basis of largely reducing the new well investment and the old well operation cost, and improves the economical benefit of old oil field development.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to a low-cost equivalent water flooding method in the late stage of extra-high water cut in medium-high permeability reservoirs. Background technique [0002] Medium-high permeability reservoirs are the main reservoir types of large oilfields in my country, and most of them belong to the fluvial-delta sedimentary system, with thick reservoirs, good physical properties, high permeability, and large-scale reserves. Since it was put into development, medium and high permeability reservoirs have mainly adopted water flooding, and the degree of water flooding and water flooding sweep coefficient have been continuously improved through the subdivision of development layers and the optimization and adjustment of well patterns. Among them, the formation subdivision technology mainly solves the conflict between layers in the development of medium and high permeability reservoirs...

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to provide a low-cost equivalent water flooding method for medium and high permeability reservoirs that solves the problems of high cost and poor benefit in the late stage of ultra-high water-cut in the current water-flood development method

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