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Nitrogen injection gas well annular protection liquid capable of inhibiting oxygen corrosion and preparation method thereof

An annulus protection fluid and oxygen corrosion technology, which is applied in chemical instruments and methods, earthwork drilling, wellbore/well components, etc., can solve the problems of downhole string scaling, insufficient purity, and downhole string oxygen corrosion. Achieve the effects of improving the safe service life, reducing production costs, and good compatibility

Active Publication Date: 2017-11-07
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the insufficient purity of injected nitrogen, it is often accompanied by oxygen injection. The increase of oxygen content during injection and production will cause serious oxygen corrosion to the wellhead and downhole pipe string of oil and gas wells. At the same time, due to the high salinity of formation water, it may cause downhole fouling of the column
Corrosion and scaling problems in oil and gas wells will cause serious damage to oil and gas wells, resulting in a reduction in the safe service life of oil and gas wells, thereby increasing production costs, and corrosion and scaling of oil and gas wells will also cause serious damage to the production safety of oil and gas wells great threat

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The present invention is compounded by the following raw materials: 10% heptatenylamine ethyl imidazoline quaternary ammonium salt, 5-chloro-2-methyl-4-isothiazolin-3-one 0.5%, 2-amino- 2-Methyl-1-propanol 3%, sodium sulfite and methyl ketoxime 6%, potassium formate 10%, amino trimethylene phosphonate 0.5%, the balance is water.

[0018] The specific preparation steps are: (1) Add an appropriate amount of tap water in a closed reaction vessel; (2) Add 0.5% of 5-chloro-2-methyl-4-isothiazolin-3-one to tap water and stir to make it fully Dissolve; (3) Add 10% heptadecenylamine ethyl imidazoline quaternary ammonium salt to the above solution, stir to fully dissolve; (4) Finally, add 0.5% amino trimethylene phosphonate, sodium sulfite and methyl Base ketoxime 6%, potassium formate 10%, 2-amino-2-methyl-1-propanol 3%, and stir evenly to obtain the annular protection solution.

Embodiment 2

[0020] The present invention is compounded by the following raw materials: 11% of heptatenylamine ethyl imidazoline quaternary ammonium salt, 1.5% of 5-chloro-2-methyl-4-isothiazolin-3-one, 2-amino- 2-Methyl-1-propanol 4%, sodium sulfite and methyl ketoxime 7%, potassium formate 15%, amino trimethylene phosphonate 1%, the balance is water.

[0021] The specific preparation steps are as follows: (1) Add an appropriate amount of tap water into a closed reaction vessel; (2) Add 1.5% of 5-chloro-2-methyl-4-isothiazolin-3-one to tap water and stir to make it fully Dissolve; (3) Add 11% heptatenylamine ethyl imidazoline quaternary ammonium salt to the above solution, stir to fully dissolve; (4) Finally, add 1% amino trimethylene phosphonate, sodium sulfite and methyl 7% of base ketoxime, 15% of potassium formate, 4% of 2-amino-2-methyl-1-propanol, and stirring evenly to obtain the annular protection solution.

Embodiment 3

[0023] The present invention is compounded by the following raw materials: 12% heptatenylamine ethyl imidazoline quaternary ammonium salt, 5-chloro-2-methyl-4-isothiazolin-3-one 2.5%, 2-amino- 2-methyl-1-propanol 5%, sodium sulfite and methyl ketoxime 8%, potassium formate 20%, amino trimethylene phosphonate 1.5%, the balance is water.

[0024] The specific preparation steps are: (1) Add an appropriate amount of tap water in a closed reaction vessel; (2) Add 2.5% of 5-chloro-2-methyl-4-isothiazolin-3-one to tap water and stir to make it fully Dissolve; (3) Then add 12% heptatenylamine ethyl imidazoline quaternary ammonium salt to the above solution, stir to fully dissolve; (4) Finally, add 1.5% amino trimethylene phosphonate, sodium sulfite and methyl Base ketoxime 8%, potassium formate 20%, 2-amino-2-methyl-1-propanol 5%, stir evenly to obtain the annulus protection solution.

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Abstract

The invention provides a nitrogen injection gas well annular protection liquid capable of inhibiting oxygen corrosion and a preparation method thereof, and belongs to the technical field of corrosion protection of oil and gas wells. A nitrogen injection gas well annular protection liquid system is prepared from a corrosion inhibitor, a bactericide, a pH regulator, an oxygen scavenger, a density modifier and a scale inhibitor. The annular protection liquid comprises the following components in percentage by mass: 10%-12% of an imidazoline corrosion inhibitor, 0.5%-2.5% of an isothiazolinone fungicide, 3%-5% of an alkanes alcohol amine pH regulator, 6%-8% of a sulfite and oxime compound deoxidant, 10%-20% of an organic acid salt density regulator, 0.5%-1.5% of an organic phosphonic acid scale inhibitor, and the balance of water; and in necessary conditions, an appropriate amount of anti-swelling agent is added. The annular protection liquid provided by the invention can well control the annular oxygen corrosion problem of the nitrogen injection gas well and has the advantages of small damage to a reservoir, strong stability and environmental protection.

Description

Technical field [0001] The invention provides an annulus protection fluid capable of inhibiting oxygen corrosion for nitrogen injection wells and a preparation method thereof, belonging to the technical field of corrosion protection for oil and gas wells. Background technique [0002] With the deepening of oil and gas field development, the method of mixed injection of nitrogen and water is often used to improve oil and gas recovery. Because the purity of the injected nitrogen is not enough, it is often accompanied by the injection of oxygen. The increase in oxygen content during the injection and production process will cause serious oxygen corrosion on the wellhead and downhole pipe string of the oil and gas well. At the same time, the high salinity of the formation water may cause downhole Fouling of the pipe string. Corrosion and scaling problems in oil and gas wells can cause serious damage to oil and gas wells, resulting in a reduction in the safe service life of oil and g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/54C09K8/52
CPCC09K8/52C09K8/54C09K2208/32
Inventor 曾德智同航喻智明蔡乐乐董宝军李皓戚亚东施太和
Owner SOUTHWEST PETROLEUM UNIV
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