Corrosion and scale inhibitor

A kind of anti-corrosion and anti-scaling agent technology, applied in the field of anti-corrosion and anti-scaling agent, can solve the problems of increasing the production cost of oil field, poor anti-corrosion and anti-scaling effect, poor compatibility, etc., to improve the effect of anti-corrosion and anti-scaling, Good film-forming effect and large selectivity

Inactive Publication Date: 2020-07-31
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The first purpose of the corrosion and scale inhibitor provided by the invention is to overcome the poor compatibility of water-soluble scale inhibitors and oil-soluble corrosion inhibitors commonly used in the prior art; the second purpose is to overcome the typical commercial scale inhibitors in the prior art Corrosion inhibitors generally exhibit strong acidity, and corrosion inhibitors are generally cationic systems, which are alkaline, and the two are incompatible. When used, they tend to precipitate due to electrical neutralization, and the anti-corrosion and anti-scaling effects are poor. At the same time, it increases the cost of oil field production operations. question

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Experimental program
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Effect test

Embodiment 1

[0030] A corrosion and scale inhibitor, which is made of the following raw materials according to the following mass percentages: 1.6-10% of the water-phase scale inhibitor, 1-15% of the organic phase corrosion inhibitor, 0.1-0.3% of the thickener, emulsified Agent 9~15%, oil 52~65%, balance is water.

[0031] The water phase scale inhibitor is organic phosphonic acid, polycarboxylic acid acid scale inhibitor, and the organic phosphonic acid is aminotrimethylphosphonic acid, 2-phosphonic acid butane-1,2,4-tricarboxylic acid , one or several combinations of diethylenetriaminepentamethylphosphonic acid, polycarboxylic acid acid scale inhibitor is polymaleic anhydride.

[0032] The organic phase corrosion inhibitor is one or more combinations of imidazoline derivative corrosion inhibitors, phosphonic acid, phosphonic acid, mercaptobenzothiazole; the imidazoline derivative corrosion inhibitor is oleic acid sulfur One or more combinations of ureidoimidazoline and benzoic acid thio...

Embodiment 2

[0047]A kind of anticorrosion and antiscaling agent, it is made by following raw material by following mass percent: aqueous phase antiscaling agent 2-phosphonic acid butane-1,2,4-tricarboxylic acid (PBTCA) 8%, organic phase Corrosion inhibitor 12%, described organic phase corrosion inhibitor is the mixture of oleic acid thioureido imidazoline or phosphonic acid or oleic acid thioureido imidazoline and phosphonic acid, thickener 0.2%, described thickener is Carboxymethyl cellulose (CMC), starch, gelatin, sodium alginate, casein, guar gum, chitosan or one or more combinations, emulsifier sorbitan tristearate (Span-65 ) 9%, diesel oil 52%, and the balance is water.

[0048] The preparation method of described corrosion and scale inhibitor comprises the steps:

[0049] 1) First, in the emulsification reaction kettle, sequentially add the organic phase corrosion inhibitor oleic acid thioureidoimidazoline 12% and the emulsifier sorbitan tristearate (Span-65) 9%, secondly, the orga...

Embodiment 3

[0062] A kind of corrosion and scale inhibitor, it is made by following raw material by following mass percent: water phase scale inhibitor aminotrimethylphosphonic acid (ATMP) 5.8%, organic phase corrosion inhibitor 8%, described organic phase The corrosion inhibitor is one or more combinations of thioureidoimidazoline benzoate, phosphine carboxylic acid, and mercaptobenzothiazole, and the thickener is 0.2%, and the thickener is guar gum, gum arabic, soybean protein One or more combinations of glue, natural rubber, lanolin, agar, emulsifier propylene glycol fatty acid ester (PO-50) 12%, kerosene 60%, and the balance is water.

[0063] The preparation method of described corrosion and scale inhibitor comprises the steps:

[0064] 1) First, add 8% of organic phase corrosion inhibitor thioureidoimidazoline benzoate and 12% of emulsifier propylene glycol fatty acid ester (PO-50) in the emulsification reaction kettle in sequence, and then, the organic phase corrosion inhibitor and...

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Abstract

The invention belongs to the field of oilfield chemistry, and particularly provides a corrosion and scale inhibitor. The corrosion and scale inhibitor is prepared from, by mass percentage, 1.6-10% ofa water-phase scale inhibitor, 1-15% of an organic-phase corrosion inhibitor, 0.1-0.3% of a thickening agent, 9-15% of an emulsifier, 52-65% of oil and the balance water. The problem that common water-soluble scale inhibitors and oil-soluble corrosion inhibitors are poor in compatibility is solved. The corrosion and scale inhibitor can also achieve corrosion resistance and scale prevention of oilwells. Indoor experiments show that the corrosion inhibition rate of a system is larger than 90%, the scale prevention rate is larger than 80%, the effect is obvious, and the preparation process is simple. The corrosion and scale inhibitor has high thermodynamic and dynamic stability, is gradually released and demulsified after being injected into the wells, can be evenly dispersed in a produced aqueous medium while protecting the corrosion resistance of a shaft carbon steel pipe column, achieves effective scale prevention of a shaft, and also reduces the production and operation cost of oilfields.

Description

technical field [0001] The invention belongs to the technical field of oilfield chemistry, and in particular relates to a corrosion and scale inhibitor. Background technique [0002] After the oilfield enters the water-cut period and is developed, due to the thermodynamic instability and chemical incompatibility of water, it often causes scaling problems in the wellbore of the oil well, the surface system and the water injection formation, which brings great problems to the production. And in different production stages, scaling also has dynamic changes and influences: [0003] 1. With the water content in the produced fluid (original formation water or injected clean water / sea water, produced water) or the content of polymers, other gases and other media in tertiary oil recovery from low to high; [0004] 2. Incompatibility mixing between injected water (medium) and formation water, or multi-layer produced fluid; [0005] 3. The decrease of temperature and pressure in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/10C23F15/00
CPCC23F11/10C23F15/005
Inventor 刘宁李琼玮周志平戚建晶苑慧莹姜毅刘爱华董俊周佩杨会丽
Owner PETROCHINA CO LTD
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