Method for enhancing water injecting capacity of hypotonic oil field by utilizing nano-powder material

Abstract

The invention relates to a method for enhancing the water injecting capacity of a hypotonic oil filed by utilizing a nano-powder material. A turbid liquid injection increasing agent with the concentration of 2 percent is prepared by nano-powder and an oil-soluble solvent and injected into an injection increasing segment stopper of the nano-powder material from a water injection well pipe pillar, the injection increasing agent of 5 cubic meters is injected in an oil layer of every meter by thickness, a pump is stopped and a well is closed for 72 hours, isometric inverted discharged liquid is injected in well opening production and then water is injected. According to the method for enhancing the water injecting capacity of the hypotonic oil field by utilizing the nano-powder material, the selective and moistening nano-powder material is injected to the hypotonic oil layer, by absorption of the surfaces of rock hole gaps with the material, the properties of the surfaces of the rock hole gaps are changed, therefore, aqueous phase permeability is improved, improvement of the water injection capacity of a hypotonic oil reservoir is achieved, and the problem of difficulty in water injection of the hypotonic oil layer is solved.

Description

【Technical field】 [0001] The invention relates to an oil field water injection technology, in particular to a method for enhancing the water injection capacity of a low-permeability oil field by using a nanometer powder material, and belongs to the technical field of oil field development. 【Background technique】 [0002] With the increasing global demand for oil and natural gas, the oil and gas resources stored in medium and high permeability reservoirs can no longer fully meet the demand. In recent years, among the proven oil and gas reservoirs in my country, the proportion of low permeability oil and gas reservoirs is as high as 60-70%. Due to the small size of seepage channels and complex seepage law in low-permeability oil and gas reservoirs, the production difficulty is much greater than that of conventional oil and gas reservoirs, and the recovery factor is low. [0003] At present, the water injection development method is the most important development method for lo...

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Problems solved by technology

Due to the small size of seepage channels and complex seepage rules in low-permeability oil and gas reservoirs, the production difficulty is much greater than that of conventional oil and gas reservoirs, and the recovery rate is low

[0003] At present, the water injection development method is the most important development method for low-permeability oilfields, but on the one hand, due to the inherent low-permeability characteristics of this type of reservoir; Severe pollution in the zone, decreased formation permeability, decreased oil well production, decreased water well injection rate or no injection, and decreased formation energy have seriously affected the ultimate recovery of oilfields

Fracturing and acidizing are common injection stimulation measures, but oil reservoir fracturing can lead to severe heterogeneity, and even lead to "water channeling" between injection and production wells, reducing the water injection sweep coefficient, and acidizing measures can also cause environmental pollution and corrosion problems

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