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Corrosion inhibitor composition for anticorrosion of high temperature oxygen-containing air foam flooding injection system

A technology of oxygen-containing air and injection system, applied in the field of oilfield chemistry

Inactive Publication Date: 2020-04-21
中国石油大港油田采油工艺研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for air foam flooding, it is difficult for traditional liquid corrosion inhibitors, rod-shaped and ring-shaped solid corrosion inhibitors to show good corrosion inhibition effects at high temperature without affecting foam performance.

Method used

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  • Corrosion inhibitor composition for anticorrosion of high temperature oxygen-containing air foam flooding injection system
  • Corrosion inhibitor composition for anticorrosion of high temperature oxygen-containing air foam flooding injection system
  • Corrosion inhibitor composition for anticorrosion of high temperature oxygen-containing air foam flooding injection system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1 Configuration of corrosion inhibitor composition for anticorrosion of high temperature oxygen-containing air foam flooding injection system

[0033] Weigh NiSO 4 8g, 3.5g sodium ethylenediamine tetramethylene phosphonate, 1g lactic acid, 0.6g citric acid, P-20.1g, dissolved in 986.8g water, kept stirring at 50℃ for 10min, and finally adjusted the pH value to 5.0 with NaOH solution ~5.5.

[0034] The P-2 is coconut amine polyoxyethylene ether phosphate sodium salt, the structure is shown in formula 1, and the synthesis method is:

[0035] a. First, add cocoamine polyoxyethylene ether to a three-necked round-bottomed flask, add polyphosphoric acid to the beaker and dissolve it with ethanol; slowly drop the polyphosphoric acid ethanol solution into the alkylamine polyoxyethylene ether under reflux and stirring Then, the temperature was raised to 70°C and the reaction continued for 3 hours;

[0036] b. Then, add 5% distilled water and hydrolyze for 12h;

[0037] c. Finall...

Embodiment 2

[0040] Example 2 Configuration of corrosion inhibitor composition for anticorrosion of high temperature oxygen-containing air foam flooding injection system

[0041] Weigh NiSO 4 9g, 3.2g sodium ethylenediamine tetramethylene phosphonate, 1.8g lactic acid, 0.8g citric acid, 0.18g P-2, dissolved in 985g water, kept stirring at 50℃ for 10min, and finally adjusted the pH value to with NaOH solution 5.0~5.5.

[0042] The P-2 is soybean oil amine polyoxyethylene ether phosphate sodium salt, the structure is shown in formula 2, and the synthesis method is:

[0043] a. First, add soybean oil amine polyoxyethylene ether into a three-necked round-bottom flask, add polyphosphoric acid to the beaker and dissolve it with ethanol; slowly drop the polyphosphoric acid ethanol solution into the alkylamine polyoxyethylene ether under reflux and stirring Then, the temperature was raised to 70°C and the reaction continued for 3 hours;

[0044] b. Then, add 5% distilled water and hydrolyze for 12h;

[00...

Embodiment 3

[0048] Example 3 Configuration of corrosion inhibitor composition for anticorrosion of high temperature oxygen-containing air foam flooding injection system

[0049] Weigh NiSO 4 10g, ethylenediamine tetramethylene phosphonate sodium 3g, lactic acid 1.5g, citric acid 1g, P-2 0.15g, dissolved in 984.35g water, kept stirring at 50℃ for 10min, finally adjusted the pH value to 5.0 with NaOH solution ~5.5.

[0050] The P-2 is tallow amine polyoxyethylene ether phosphate sodium salt, the structure is shown in formula 3, and the synthesis method is:

[0051] a. First, add tallow amine polyoxyethylene ether to a three-necked round-bottom flask, add polyphosphoric acid to the beaker and dissolve it with ethanol; slowly drop the polyphosphoric acid ethanol solution into the alkylamine polyoxyethylene ether under reflux and stirring , Then the temperature was raised to 70°C, and the reaction continued for 3 hours;

[0052] b. Then, add 5% distilled water and hydrolyze for 12h;

[0053] c. Finall...

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Abstract

The invention discloses an anti-corrosion corrosion inhibitor composition for a high-temperature oxygen containing air foam flooding injection system. The anti-corrosion corrosion inhibitor composition comprises, by mass percent, 0.01%-0.02% of P-2, 0.8%-1.2% of NiSO4, 0.25%-0.35% of EDTMPS, 0.10%-0.20% of lactic acid, 0.06%-0.12% of citric acid and the balance water. After pre-filming treatment is conducted through the corrosion inhibitor composition, the average corrosion rate of a casing pipe in high-temperature and normal-pressure foam is reduced to 0.021 mm / a-0.030 mm / a from 12.592 mm / a,the average corrosion rate of the casing pipe in high-temperature and high-pressure foam is reduced to 0.054 mm / a-0.055 mm / a from 25.232 mm / a, and it is shown that the casing pipe subjected to pre-filming through the corrosion inhibitor composition has a good corrosion inhibition function in the high-temperature and normal-pressure foam and the high-temperature and high-pressure foam.

Description

Technical field [0001] The invention belongs to the field of oil field chemistry, and specifically relates to a corrosion inhibitor composition for anticorrosion of a high-temperature oxygen-containing air foam flooding injection system. Background technique [0002] At present, the development of most oil reservoirs in my country is in the middle and late stages. The comprehensive water cut of oil wells is high, the development is difficult, and the production cost is high. How to maintain efficient production of oil fields has become the main problem facing development. The air injection technology for light oil reservoirs is a promising new technology for enhancing oil recovery. However, for the heterogeneous layers of most oil fields in my country, gas channeling and viscous fingering are prone to occur simply by gas injection. To solve this problem, a foam system was introduced to control fluidity. The air foam process combines the advantages of air flooding and foam flood...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F11/08
CPCC23F11/08
Inventor 程海鹰蒋官澄张杰柳敏任妍君姚旭阳章杨吴辉
Owner 中国石油大港油田采油工艺研究院
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