Oil-water medium corrosion inhibitor for corrosion control on oilfield-production oil gas water collection and transmission system

A technology of gathering and transportation system and corrosion control, applied in wellbore/well components, earthwork drilling, etc., can solve problems such as more stringent requirements for corrosion inhibitor performance, high salinity of separated water, affecting crude oil dehydration, etc. To achieve the effect of good pharmaceutical effect, high input-output ratio, and low cost of dosing

Active Publication Date: 2014-10-01
XIAN HUANUO ENVIRONMENTAL PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are a large number of corrosion inhibitors on the market, but due to the complex medium of the oil well output fluid in the oil-gas-water gathering and transportation system of oilfield production, the separation water of the output fluid has high salinity, low pH value, contains a large amount of carbon dioxide, bacteria, and a certain amount Hydrogen sulfide, the medium is very corrosive, and since the produced liquid medium is a mixture of oil and water, the requirements for the performance of the corrosion inhibitor are more stringent. At the same time, it cannot emulsify the produced liquid, which will affect the later dehydration of crude oil

Method used

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  • Oil-water medium corrosion inhibitor for corrosion control on oilfield-production oil gas water collection and transmission system
  • Oil-water medium corrosion inhibitor for corrosion control on oilfield-production oil gas water collection and transmission system
  • Oil-water medium corrosion inhibitor for corrosion control on oilfield-production oil gas water collection and transmission system

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Experimental program
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Effect test

Embodiment 1

[0024] Formula composition: based on 100% of composition mass, 10% of bisquaternary ammonium salt of imidazoline and alkyl tertiary ammonium, 4% of mercaptoalkanoic acid, 5% of organic urea compound, 4% of thiocyanate, and quaternary ammonium salt of alkyl tertiary ammonium Ammonium salt 7%, fatty alcohol polyoxyethylene ether 3%, alkylphenol polyoxyethylene ether 2%, and the rest is water.

[0025] The synthesis process of the double quaternary ammonium salt of imidazoline and alkyl tertiary amine is: add dodecyl tertiary amine into the reaction kettle, then dropwise add equimolar p-dichlorobenzyl, and slowly heat up to 120°C after the dropwise addition , the stirring reaction time is 4 hours, and then equimolar naphthenic acid imidazoline is added dropwise, and the temperature is slowly raised to 150°C after the dropwise addition, and the stirring reaction time is 6 hours.

[0026] The optimized mass ratio of mercaptoalkanoic acid and its mixture is thioglycolic acid: mercap...

Embodiment 2

[0035] Formula composition: based on 100% of the composition mass, 12% of bisquaternary ammonium salt of imidazoline and alkyl tertiary ammonium, 3% of mercaptoalkyl acid, 4% of organic urea compound, 3% of thiocyanate, and quaternary ammonium salt of alkyl tertiary ammonium Ammonium salt 8%, fatty alcohol polyoxyethylene ether 2%, alkylphenol polyoxyethylene ether 4%, and the rest is water.

[0036] The synthesis process of the double quaternary ammonium salt of imidazoline and alkyl tertiary amine is as follows: add octaalkyl tertiary amine to the reaction kettle, then add equimolar p-dichlorobenzyl dropwise, and slowly heat up to 120°C after the dropwise addition, The stirring reaction time is 4 hours, and then equimolar oleic acid imidazoline is added dropwise, and the temperature is slowly raised to 150°C after the dropwise addition, and the stirring reaction time is 6 hours.

[0037] The mass ratio of the components in the optimized mixture of the mercaptoalkanoic acid i...

Embodiment 3

[0046] Formula composition: based on 100% of composition mass, 8% of imidazoline and alkyl tertiary ammonium diquaternary ammonium salt, 5% of mercaptoalkyl acid, 6% of organic urea compound, 5% of thiocyanate, alkyl quaternary ammonium Ammonium salt 10%, fatty alcohol polyoxyethylene ether 5%, and the rest is water.

[0047] Among them, the synthesis process of the double quaternary ammonium salt of imidazoline and alkyl tertiary amine is: add octaalkyl tertiary amine in the reaction kettle, then dropwise add equimolar p-dichlorobenzyl, slowly heat up to 120°C after the dropwise addition, The stirring reaction time was 4 hours, and then an equimolar imidazoline laurate was added dropwise, and the temperature was slowly raised to 150°C after the dropping, and the stirring reaction time was 6 hours.

[0048] The mass ratio of each component in the optimized mixture of mercaptoalkanoic acid is mercaptoacetic acid:mercaptopropionic acid=8:2.

[0049] The mass ratio of each compo...

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Abstract

The invention relates to an oil-water medium corrosion inhibitor for corrosion control on an oilfield-production oil gas water collection and transmission system, which comprises 1-25% of bis quaternary ammonium salts of imidazoline and alkyl-tert ammonium, 0.5-10% of sulfhydryl alkyl acid, 1-15% of organic urea compound, 1-10% of thiocyanide, 1-15% of alkyl quaternary ammonium salts, 0-10% of fatty alcohol polyethenoxy ether, 0-10% of alkylphenol polyoxyethylene and the balance of water. The corrosion inhibitor can control the corrosion of the oilfield-production oil gas water collection and transmission system with different oil-water ratio media; and when the charging amount reaches 100 mg / L, the corrosion inhibition rate can reach 75% above, and the corrosion rate can be controlled at 0.076mm / a below, thereby solving the problems of small property change application range of oil well production solution media, low corrosion inhibition rate and influence of emulsification on demulsification in the corrosion inhibitor on the market.

Description

technical field [0001] The invention relates to the technical field of oilfield production, in particular to an oil-water medium corrosion inhibitor used for corrosion control of oil-gas-water gathering and transportation systems in oilfield production, mainly used for oil-gas-water gathering and transportation system combined station equipment, export pipelines and oil wells in oilfield production Corrosion control of oil casing. technical background [0002] In the process of oilfield production, with the prolongation of the production time, the water content of the produced oil well production fluid continues to rise, and free water appears in the production fluid. Due to the high salinity and low pH of the free water in the production fluid, Contains a large amount of carbon dioxide, a certain amount of hydrogen sulfide, and a large amount of SRB sulfate-reducing bacteria, which will cause corrosion to oil well casings, gathering and transportation pipelines, pipe networ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/16C09K8/54
Inventor 杜素珍李建东尹志福张永强李辉余海棠白李郭学辉
Owner XIAN HUANUO ENVIRONMENTAL PROTECTION CO LTD
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