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Technology method for deblock of oil field oil-water well using biological acid

A process method, bio-acid technology, applied in the direction of earthwork drilling, wellbore/well components, production fluids, etc., can solve problems such as oil layer clogging, achieve the effect of small influence, prevent particle migration, and small corrosion

Inactive Publication Date: 2006-09-13
SUNCOO PETROLEUM TECH
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a process for removing clogging of oil and water wells in oilfields using bio-acid to solve the problem of clogging of oil layers caused by the above-mentioned existing stimulation techniques

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] For further disclosing the technical scheme of the present invention, the following are described in detail by the examples:

[0023] The process method of the present invention is to formulate biological acid, water and auxiliary agent into blockage-removing fluid, and inject the agent into oil well or water well at normal temperature, biological acid penetrates into the pore throat of the oil layer, enters the microscopic pores, is adsorbed on the surface layer of the rock core, squeezes into the radius 0.5-15 meters, stable pressure for 0-1.5 hours, open well for 4-12 hours, no liquid drainage, improve core performance, restore formation permeability, improve water wetting effect, enhance anti-swelling and sand stabilization effect, and prevent scale from forming again Sedimentation, enhanced oil recovery.

[0024] As a water-soluble product, bio-acid can transform the wettability of the reservoir rock surface from oil-wet to water-wet, thereby changing the wet state...

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PUM

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Abstract

The invention is a process method for unblocking water and oil wells in an oil field by biological acid, characterized by mixing biological acid and water as well as assistant into unblocking agent, squeezing the unblocking agent into oil or water well at normal temperature, so that the unblocking agent gradually seeps into strata, the biological acid seeps into throats to enter in micro-scopical holes and are absorbed on the surface layers of cores, where the squeezing radius is 1-15 m, pressure is stabilized for 0-1.5 h, and 4-18 h later, opening the well,and not discharging fluid, thus improving core property, recovering stratum permeability, stopping stains redeposition, reducing oil and water interface tension and raising crude oil recovery.

Description

1. Technical field [0001] The invention relates to a method for removing plugging of oil and water wells in oil field development, in particular to a process for removing plugging of oil and water wells in oil fields by using biological acid. 2. Background technology [0002] At present, in order to improve the ultimate recovery of oilfields, many production stimulation measures are taken in the development. Among them, the acidification and plugging removal of the oil layer to improve the porosity and permeability of the oil layer is one of the main production stimulation measures. The method of acidification and plugging removal to increase production is feasible, but different The acidizing plugging removal process has different effects and defects, such as fracturing and acidizing, which has a certain effect of increasing production, but the corrosion of the oil well string is relatively large, which reduces the service life of the oil and casing, causes collapse of the f...

Claims

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Application Information

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IPC IPC(8): E21B43/22
Inventor 盖海防
Owner SUNCOO PETROLEUM TECH
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