Low-temperature acidification corrosion inhibitor and preparation method thereof

An acidification corrosion inhibitor and low-temperature technology, which is applied in the field of acidification corrosion inhibitor and its preparation, can solve the problems of restricting the large-scale use and promotion of low-temperature corrosion inhibitors, poor corrosion inhibition effect of working pipe strings, and high production cost of corrosion inhibitors. , achieve the effect of low production cost, little environmental pollution and reduced corrosion

Inactive Publication Date: 2011-04-27
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The low-temperature (greater than 60°C but less than 90°C) acidification corrosion inhibitors currently used in oil fields are usually nitrogen-containing compounds, sulfur-containing compounds, acetylenic compounds, aldehydes, ketones, lipophilic compounds, surfactants, etc.; they exist Many deficiencies, including poor compatibility with acid liquid and various additives, such as some corrosion inhibitors forming flocs in acid liquid, or even precipitation; poor

Method used

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  • Low-temperature acidification corrosion inhibitor and preparation method thereof
  • Low-temperature acidification corrosion inhibitor and preparation method thereof
  • Low-temperature acidification corrosion inhibitor and preparation method thereof

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0019] Example 1:

[0020] Add 300kg of refined methanol to the reactor, then add 500kg of benzyldimethyl dodecylammonium bromide, 120kg of propynol, 80kg of cetylpyridinium bromide, at a speed of 60 revolutions per minute Stir for 30 minutes. After stirring evenly, a uniform red-brown liquid is formed, which is a low-temperature acidification corrosion inhibitor.

[0021] Evaluation of corrosion inhibition effect:

[0022] Static corrosion test test: 90℃, N80 steel sheet, tested for 4 hours, the corrosion inhibitor concentration is 1.0%, the corrosion rate results in different acid systems are shown in Table 1:

[0023] Table 1 Test comparison of corrosion inhibitor

[0024]

[0025] It can be seen from the corrosion rate results of the five acid solution systems under the same addition amount and the same experimental conditions that the corrosion inhibitor of the present invention is better than the currently commonly used low-temperature acidification corrosion inhibitor, and the s...

Example Embodiment

[0026] Example 2:

[0027] Add 350kg of refined methanol to the reactor, then add 280kg of dodecyldimethylbenzylammonium chloride, 300kg of 1,4-butynediol and 70kg of chlorododecylpyridine, with 60 revolutions Stir for 30 minutes at a speed of 1 / min. After stirring evenly, a uniform red-brown liquid is formed, which is a low-temperature acidification corrosion inhibitor.

[0028] Test with the acid system used in the actual acidification operation of the oil field. Static corrosion test test: 90℃, N80 steel sheet, test for 4 hours.

[0029] Table 2 Tests in acid system

[0030]

[0031] It can be seen from the experimental results in Table 2 that under the same addition amount, the corrosion resistance of the low-temperature corrosion inhibitor of the present invention in acid solution is better than that of the low-temperature acidizing corrosion inhibitor commonly used in oil fields. Furthermore, even if the added amount of the currently used low-temperature acidification corrosion...

Example Embodiment

[0032] Example 3:

[0033] Add 400kg of refined methanol to the reactor, and then add 400kg of benzyldimethyl dodecylammonium bromide, 100kg of methylbutynol, 100kg of chlorododecylpyridine, at 60 revolutions per minute Stir at a speed of 30 minutes, and after stirring evenly, a uniform red-brown liquid is formed, which is a low-temperature acidification corrosion inhibitor.

[0034] Table 3 Test comparison of corrosion inhibitors

[0035]

[0036] It can be seen from the corrosion rate results of the five acid solution systems under the same addition amount and the same experimental conditions that the corrosion inhibitor of the present invention is better than the currently commonly used low-temperature acidification corrosion inhibitor, and the surface of the test piece is smooth without Pitting phenomenon.

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Abstract

The invention relates to a low-temperature acidification corrosion inhibitor which is composed of 10-50 parts by weight of alkynol, 10-50 parts by weight of quaternary ammonium salt and 5-10 parts by weight of heterocyclic compound, wherein the alkynol is selected from butyn alcohol, hexynol, popargyl alcohol, 1,4-butyne glycol, dormison, methyl butynol, butyne glycol, and 4-trimethylsilyl isocyanate-3-butyn alcohol; the quaternary ammonium is selected from dimethyl benzyl ammonium chloride, rosin modified oleic acid group imidazoline quaternary ammonium salt, quaternary ammonium tribenzal-imidazoline, (4-vinyl)-quinoline benzyl quinoline chloride quaternary ammonium salt, (4-vinyl)-quinoline benzyl pyridine chloride quaternary ammonium salt, epoxypropane group quinoline chloride, epoxypropane group pyridine chloride, allyl quinoline chloride and allyl pyridine chloride; the heterocyclic compound is selected from bromination hexadecy pyridine, cetylpyridine chloride, chlorinated dodecyl pyridine and bromination myristyl lycine pyridine. The invention also relates to a preparation method of the low-temperature acidification corrosion inhibitor.

Description

technical field [0001] The invention relates to an acidification corrosion inhibitor and a preparation method thereof, in particular to a low-temperature acidification corrosion inhibitor and a preparation method thereof. Background technique [0002] Acidizing operation is already one of the indispensable production stimulation technologies in the oilfield production process. Due to the corrosion of surface equipment and downhole pipe strings by acid liquid, it is necessary to use corrosion inhibitors in acid liquid to reduce or eliminate corrosion. The low-temperature (greater than 60°C but less than 90°C) acidification corrosion inhibitors currently used in oil fields are usually nitrogen-containing compounds, sulfur-containing compounds, acetylenic compounds, aldehydes, ketones, lipophilic compounds, surfactants, etc.; they exist Many deficiencies, including poor compatibility with acid liquid and various additives, such as some corrosion inhibitors forming flocs in acid...

Claims

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Application Information

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IPC IPC(8): C23F11/04
Inventor 张海陈翔宇冯建建赵强
Owner CHINA NAT OFFSHORE OIL CORP
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