A well selection and layer selection method for injecting large-scale oil displacement fluid into water injection wells in thin and poor oil layers in sandstone reservoirs

Abstract

The invention relates to a method for selecting wells and layers for injecting large-scale oil displacement fluid into water injection wells in thin and poor oil layers of sandstone reservoirs. It mainly solves the problem that the formation energy is insufficient and effective communication between oil and water wells cannot be formed, resulting in insufficient formation of oil well production capacity and poor water injection capacity of thin and poor layers with poor seepage capacity. Its characteristics are: (1) Optimizing the target wells: select wells with relatively perfect injection-production relationship, poor connectivity between oil and water wells, and long-term deficits in the formation; water injection wells should be porosity, low air permeability, and have certain potential tapping Potential wells; water injection wells can meet the construction requirements of injecting large-scale fracturing fluid flooding into water injection wells; (2) Target layer selection: According to the injection-production relationship of the target well, the thickness of the oil layer development, the thickness of the interlayer, the fluid production rate, the production Based on parameters such as fluid strength, formation pressure, and producing conditions, the sedimentary units with poor production and high potential are selected as target layers. The method improves the production stimulation development effect of the thin differential layer.

Description

technical field [0001] The invention relates to the technical field of oil field development, in particular to a method for selecting wells and layers for injecting large-scale oil displacement fluid into water injection wells in thin and poor oil layers of sandstone reservoirs. Background technique [0002] At present, conventional fracturing well selection and layer selection is mainly to select wells that are polluted and seepage in the oil layer needs to be improved, and change the seepage conditions of the fluid in the formation in a small range, remove oil layer pollution, improve the seepage capacity of the oil layer, and improve the production capacity of the well. The new technology mainly selects thin poor layers, formation energy deficit layers and well layers with poor seepage capacity, injects large-scale oil displacement fluid through water injection wells to replenish formation energy, and changes the seepage capacity between oil production wells and water inje...

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Problems solved by technology

[0003] The present invention is to overcome the problems existing in the background technology that due to the large well spacing and poor seepage capacity of the thin differential layer, the lack of formation energy cannot form an effective connection between the water injection well and the oil production well, so that the production capacity of the oil layer is low and the production capacity of the oil well is low. problem, and provide a method of well selection and layer selection for injecting large-scale oil displacement fluid into water injection wells in thin and poor oil layers in sandstone reservoirs

The well selection and layer selection method for injecting large-scale oil displacement fluid into water injection wells in thin and poor oil layers in sandstone reservoirs is aimed at the well selection and layer selection method for injecting large-scale oil displacement fluid into water injection wells in thin and poor layers to solve formation deficit and poor seepage capacity The problem of poor water injection ability of the thin poor layer can improve the effect of production stimulation development of the thin poor layer

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