Low-cost equivalent water flooding method in the late stage of ultra-high water cut in medium-high permeability reservoirs

Abstract

The present invention provides a low-cost equivalent water flooding method in the late period of ultra-high water cut of medium and high permeability oil reservoirs. The low-cost equivalent water flooding method of medium and high permeability oil reservoirs in the late stage of ultra-high water cut comprises: step 1, evaluating the energy retention status of the reservoir; 2. Evaluate the liquid production, water injection capacity and promotion potential of the reservoir; Step 3, evaluate the equivalent water flooding well spacing range and displacement pressure gradient; Step 4, prepare and implement the equivalent water flooding well pattern adjustment plan; Step 5, evaluate Equivalent water flooding single well fluid production and production pressure difference; step 6, formulate and implement equivalent water flood formation pressure recovery plan; step 7, formulate and implement water channeling prevention plan during pressure recovery; step 8, formulate and implement Extraction program. The low-cost equivalent water flooding method in the late stage of ultra-high water cut in medium-high permeability reservoirs maximizes the role of stock oil and water wells, and can achieve the equivalent development effect of dense well pattern on the basis of greatly reducing the investment in new wells and operating costs of old wells , to improve the economic benefits of old oilfield 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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