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Scale removal and prevention online acidizing method for water injection well

A technology for on-line cleaning and anti-scaling, water injection wells, applied in cleaning appliances, earth-moving drilling, wellbore/well components, etc. Effective time of acidification, reduction of construction procedures, and optimization of the effect of acidification work

Inactive Publication Date: 2018-04-13
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the disadvantages of long construction period, high labor intensity and complicated construction procedures in the conventional acidification construction in the prior art, and because the formation scaling is not eliminated and suppressed, the acidification effect is poor and the acidification validity period Short and other questions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] An on-line acidification method for cleaning and preventing scale in water injection wells, comprising the following construction steps:

[0019] 1) The water injection well does not stop injecting. During construction, the wellhead of the water injection well is closed, the inlet of the injection equipment is connected to the acid tank, and the outlet of the injection equipment is connected to the wellhead of the water injection well;

[0020] 2) Mix the acid and water in the acid tank into a mixed liquid, open the wellhead of the water injection well, and use the injection equipment to inject the mixed liquid into the wellbore of the water injection well through the original water injection string;

[0021] 3) Inject the cleaning and anti-scaling liquid into the wellbore of the water injection well through the injection equipment;

[0022] 4) Close the wellhead of the water injection well, disassemble the injection equipment, and then open the wellhead of the water in...

Embodiment 2

[0030] An on-line acidification method for cleaning and preventing scale in water injection wells, comprising the following construction steps:

[0031] 1) The water injection well does not stop injecting. During construction, the wellhead of the water injection well is closed, the inlet of the injection equipment is connected to the acid tank, and the outlet of the injection equipment is connected to the wellhead of the water injection well;

[0032] 2) Mix the chelating acid and water in the acid tank into a mixed solution, open the wellhead of the water injection well, and use injection equipment to inject the mixed solution into the wellbore of the water injection well through the original water injection string; the mass ratio of the chelating acid to water is It is 1:1; described chelating acid comprises following components and content: hydrochloric acid 27%, hydrofluoric acid 45%, acetic acid 10%, triacetoxylindole 5% and aminotriacetic acid 13% balance; When the mixtu...

Embodiment 3

[0038] An on-line acidification method for cleaning and preventing scale in water injection wells, comprising the following construction steps:

[0039] 1) The water injection well does not stop injecting. During construction, the wellhead of the water injection well is closed, the inlet of the injection equipment is connected to the acid tank, and the outlet of the injection equipment is connected to the wellhead of the water injection well;

[0040] 2) Mix the chelating acid and water in the acid tank into a mixed solution, open the wellhead of the water injection well, and use injection equipment to inject the mixed solution into the wellbore of the water injection well through the original water injection string; the mass ratio of the chelating acid to water is It is 1:1.7; described chelating acid comprises following components and content: hydrochloric acid 32%, hydrofluoric acid 40%, acetic acid 15%, triacetoxylindole 3% and aminotriacetic acid 10%; described acid When ...

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PUM

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Abstract

The invention belongs to the technical field of water injection well acidizing in downhole operation engineering of the field of oil field water injection exploitation and particularly relates to a scale removal and prevention online acidizing method for a water injection well. The scale removal and prevention online acidizing method comprises the following construction steps that in construction,a wellhead of the water injection well is closed, an inlet of injection equipment is connected with an acid tank, and an outlet of the injection equipment is connected with the wellhead of the waterinjection well; acid in the acid tank and water are mixed into a mixing solution, the wellhead of the water injection well is opened, and the mixing solution is injected into a shaft of the water injection well through the injection equipment; scale removal and prevention liquid is injected into the shaft of the water injection well through the injection equipment; and the wellhead of the water injection well is closed, the injection equipment is detached, and then, the wellhead of the water injection well is opened for recovering normal water injection. The defects of long construction period, large labor intensity, complicated construction process and the like of the construction process in conventional acidizing construction are overcome; the generating number of scale in a stratum is decreased, the acidizing operation effect is optimized, and the effective acidizing time is prolonged; and meanwhile the construction process is reduced, the labor intensity is reduced, and the construction efficiency is improved greatly.

Description

technical field [0001] The invention belongs to the technical field of water injection well acidification in downhole operation engineering in the field of oil field water injection development, and in particular relates to an online acidification method for water injection well cleaning and preventing scale. Background technique [0002] At present, during the development of low-permeability reservoirs in domestic oilfields, after a period of water injection development, problems such as water injection capacity decline and near-wellbore pollution often occur. For reservoirs where the injected water and formation water are not compatible, formation scaling still exists . At present, to solve this problem, conventional acidizing operations are often used in China to remove plugs, but in conventional acidizing construction, a four-step treatment process is required, namely "injecting pre-fluid → injecting treatment fluid → injecting post-fluid → injecting displacement fluid" ...

Claims

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Application Information

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IPC IPC(8): E21B37/06E21B43/20E21B43/22
CPCE21B37/06E21B43/16E21B43/20
Inventor 宋昭杰陆红军姚斌张随望陆小兵王勇隋蕾王尔珍邓志颖
Owner PETROCHINA CO LTD
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