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Corrosion inhibitor composition

A technology of composition and corrosion inhibitor, which is applied in wellbore/well parts, earthwork drilling and production, etc., can solve the problems of large amount of corrosion inhibitor, poor use effect, short action period, etc., and achieve high corrosion inhibition performance

Inactive Publication Date: 2013-03-13
NORTHWEST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a corrosion inhibitor composition suitable for oil wells with high corrosion inhibition performance, so as to solve the shortcomings of existing corrosion inhibitors such as large dosage, poor use effect and short action period.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: Compounding of bicyclic imidazoline and PBTCA

[0015] Weigh 2.5g of bicyclic imidazoline and 2.5g of PBTCA, mix the two agents, set the volume in a 1L volumetric flask, and set aside.

[0016] The corrosion inhibition rate at different concentrations of the corrosion inhibitor prepared in Example 1 was measured.

[0017] The test uses oilfield production fluid as the corrosion medium, the test coupon is A3 carbon steel, the test period is 7 days, and the temperature is set at 50oC. After the test, the coupons were processed to measure their corrosion inhibition rate. The results are shown in Table 1.

[0018]

[0019] As a comparison, the corrosion inhibition rate of bicyclic imidazoline or PBTCA used alone under different concentrations of wellbore corrosion inhibitors in oil wells was measured, and the results are as follows:

[0020]

[0021]

[0022] Such as Figures 1 to 3 As shown, the test results show that the corrosion inhibition perf...

Embodiment 2

[0024] Embodiment 2: Compounding of oleic acid-based imidazoline and HPMA

[0025] Weigh 2.5g oleic acid-based imidazoline and 2.5g HPMA respectively, mix and stir them, set the volume in a 1L volumetric flask, and add 50mg / L after mixing.

[0026] The corrosion inhibition rate at different concentrations of the corrosion inhibitor prepared in Example 2 was measured.

[0027] The test uses oilfield production fluid as the corrosion medium, the test coupon is A3 carbon steel, the test period is 7 days, and the temperature is set at 50oC. After the test, the coupons were processed to measure their corrosion inhibition rate. The results are shown in Table 4.

[0028]

[0029] As a comparison, the corrosion inhibition rate of oleic acid-based imidazoline or HPMA used alone under different concentrations of wellbore corrosion inhibitors in oil wells was measured, and the results are as follows:

[0030]

[0031]

[0032] The test results show that the corrosion inhibitio...

Embodiment 3

[0034] Embodiment 3: Oleic acid base imidazoline and ATMP composite

[0035] Weigh 4g of oleic imidazoline and 5g of ATMP, mix evenly, and set the volume in a 1L volumetric flask for use. Its composition is: oleic acid-based imidazoline 40mg / L, ATMP 50mg / L.

[0036] The corrosion inhibition rates of the corrosion inhibitors prepared in the above examples at different concentrations were measured. After adding 40 mg / L of oleic acid imidazoline and 50 mg / L of ATMP into the compound corrosion inhibitor of the present invention, the corrosion inhibition rate is 85%.

[0037] Change the compounding ratio of oleic acid-based imidazoline and ATMP to measure its corrosion inhibition performance. In the range of 1:5-5:1, all have a sustained-release effect of more than 80%, and the effect of 1:3-3:1 is the best. .

[0038]

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PUM

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Abstract

The invention discloses a corrosion inhibitor composition, which includes a main agent and a compounded agent. The main agent is selected from the group consisting of oleic acid based imidazoline, naphthenic imidazoline, and bis-imidazoline. The compounded agent is selected from amino tris(methylene phosphonic acid), hydrolyzed polymaleic anhydride, sodium of polyaspartic acid and 2-phosphonobutane-1, 2, 4-tricarboxylic acid. Specifically, the main agent and compounded agent are in a mass ratio of 1:5-5:1. The corrosion inhibitor composition provided in the invention is compounded by the main agent and the compounded agent in a reasonable proportion, and a synergistic effect is achieved.

Description

technical field [0001] The invention relates to a corrosion inhibitor composition, in particular to a composite corrosion inhibitor composition for oil well shafts, and belongs to the technical field of anti-corrosion and scale prevention for oil field well shafts. Background technique [0002] In the process of oil field development, corrosion has been accompanied by production from the very beginning, from the bottom of the well to the transportation of crude oil, and then to the treatment of crude oil. Corrosion and scaling have seriously affected the normal production and transportation of crude oil, causing huge economic losses to oil fields. Produced water contains H 2 S, CO 2 , O 2 Dissolved gases such as oil, suspended solids, inorganic ions, bacteria (sulfate-reducing bacteria, saprophytic bacteria), etc., these corrosive media can corrode equipment at low levels. The produced water brings the corrosive medium to the gathering and transportation system, and the ...

Claims

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Application Information

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IPC IPC(8): C09K8/54
Inventor 白林马海霞严彪赵宁宁买涛
Owner NORTHWEST UNIV
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