Well and layer selection method for pouring measure of large-scale flooding solution into thin and poor layer water-injection well of sandstone reservoir

Abstract

The present invention relates to a well and layer selection method for a pouring measure of large-scale flooding solution into a thin and poor layer water-injection well of a sandstone reservoir. Themethod mainly solves the problem that stratum energy is not enough to form effective communication between oil-water wells, so as to cause poor water injection capacity of thin and poor layer of an oil well having deficit stratum production capacity and poor filtration capacity. The method is characterized in that: (1) optimizing a target well: selecting a well that has relatively complete well group injection-production relationship, bad oil-water well connectivity, and long-term deficit stratum, wherein the water-injection well is a well having a low porosity, low air permeability and havinga certain exploitation potential; and the water-injection well can satisfy the construction requirement for pouring large-scale fracturing flooding liquid into the water injection well; and (2) optimizing a target layer: selecting a deposition unit with poor producing and great potential as the target layer according to the parameters such as the injection-production relationship of the target well, a reservoir development thickness, a barrier layer thickness, a liquid production capacity, a liquid production intensity, a stratum pressure, producing situation and the like. The method improvesyield-increasing and development effects of the thin and poor 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 a

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