Oil well selective acidizing process system

Abstract

The invention discloses an oil well selective acidizing process system comprising an active water tanker, a mixed acid liquor tanker, a high pressure pumper and an oil production well. After a heterogeneous reservoir is put into a water injection exploitation stage, water appears in an oil well universally, and difficulties are brought to oil well acidizing. If conventional acidizing is adopted, due to the influence of relative permeability, formation plugging cannot be well removed, the difference of the longitudinal permeability can be increased on the contrary, a water layer is stimulated, consequently the water content of the oil well is increased, and contradiction between interlamination and in layers is intensified. According to the oil well selective acidizing process system, single well longitudinal reservoir plugging is effectively solved by adding an appropriate amount of mixed acid liquor, the reservoir permeability is increased, and the porosity of strata is increased, so that resistance of crude oil flowing into a well cylinder is reduced, oil well output is increased, and the oil recovery ratio is enhanced.

Description

technical field [0001] The invention relates to the technical field of acidizing plugging removal technology for oil-water wells in old oilfields in the petroleum field, in particular to an acidizing plugging removal technology between different layers and in the same oil-water layer. Background technique [0002] Acidizing is a widely used oil and gas layer stimulation measure to relieve damage in the near-well zone of the oil well. The main principle is to inject an acid system into the formation of the perforated section through the downhole pipe string, and chemically react with the organic blockage in the formation and the perforated section. , thereby removing clogging, improving oil and gas seepage capacity, increasing production of oil wells, and increasing injection of water wells. [0003] With the deepening development of oilfields, most oilfields have entered the middle and late stage of water flooding development, oil wells generally see water, and the effect of...

AI Technical Summary

Problems solved by technology

For the oil layer with developed bottom water, if no pretreatment is carried out before the plugging removal construction, most of the plugging removal agent injected during the plugging removal construction will enter the bottom water layer, and the purpose of removing the plugging of the middle and low permeability layers will not be achieved.

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