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 inhibiti

Method used

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  • Corrosion inhibitor composition
  • Corrosion inhibitor composition
  • Corrosion inhibitor composition

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

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

[0015] Weigh 2.5g bicyclic imidazoline and 2.5g PBTCA, mix the two medicaments, and place them in a 1L volumetric flask for use.

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

[0017] The test uses oilfield produced fluid as the corrosive 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 and the corrosion inhibition rate was measured. The results are shown in Table 1.

[0018]

[0019] As a comparison, the corrosion inhibition rates of bicyclic imidazoline or PBTCA alone under different concentrations of oil well borehole corrosion inhibitors were measured, and the results are as follows:

[0020]

[0021]

[0022] Such as Figure 1 to 3 As shown, the test results show that the corrosion inhibition performance of the compound of bicyclic i...

Example Embodiment

[0024] Example 2: Compounding of oleic imidazoline and HPMA

[0025] Weigh 2.5g of oleic acid imidazoline and 2.5g of HPMA, mix and stir them, and place them in a 1L volumetric flask. After mixing, the concentration will be 50mg / L.

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

[0027] The test uses oilfield produced fluid as the corrosive 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 and the corrosion inhibition rate was measured. The results are shown in Table 4.

[0028]

[0029] For comparison, the corrosion inhibition rate of oleic acid-based imidazoline or HPMA was measured under different concentrations of oil well borehole corrosion inhibitors. The results are as follows:

[0030]

[0031]

[0032] The test results show that the corrosion inhibition performance of oleic imidazoline combined wi...

Example Embodiment

[0034] Example 3: Compounding of oleic imidazoline and ATMP

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

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

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