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Preparation method and application of high-temperature high-pressure corrosion inhibitor capable of resisting corrosion by H2S and CO2

A high-temperature, high-pressure, and corrosion-inhibiting technology, applied in chemical instruments and methods, earthwork drilling, drilling compositions, etc., can solve problems such as pipe wall bursting, achieve simple production process, good anti-corrosion effect, excellent corrosion resistance The effect of erosion efficiency

Active Publication Date: 2016-05-04
DONGGUAN ZHIYUAN ELECTRONICS TECH
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0006] (3) Changes in lateral force caused by changes in the velocity of high-speed fluids cause pipe wall bursts, etc.

Method used

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  • Preparation method and application of high-temperature high-pressure corrosion inhibitor capable of resisting corrosion by H2S and CO2
  • Preparation method and application of high-temperature high-pressure corrosion inhibitor capable of resisting corrosion by H2S and CO2

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preparation example Construction

[0029] see figure 1 , the anti-H of the present invention 2 S, CO 2 A method for preparing a corroded high-temperature and high-pressure corrosion inhibitor. The raw materials of the corrosion inhibitor include: 10-26% triethylenetetramine, 10-26% myristic acid, 20-36% xylene, thio Semicarbazide 25-35% and polyol 10-30%;

[0030] The preparation method of this corrosion inhibitor comprises the following steps:

[0031] Step S1, using myristic acid and triethylenetetramine to undergo amidation reaction to obtain an imidazoline intermediate; this step is specifically: step S11, mixing 10-26% triethylenetetramine and 10-26% dose of myristic acid Slowly join in the 20-36% dimethylbenzene and mix, the above-mentioned mixture obtained is transferred in the three-necked flask, and at a temperature of 40 o C-160 o React in the heater of C for 3-5h, make the water generated in the reaction steam out with azeotropic form, and the amidation reaction is completed;

[0032] Step S12,...

Embodiment 1

[0046] 1mol of myristic acid and 2mol of triethylenetetramine were added to 1mol of xylene, and the above mixture was transferred to a three-necked flask, and in a reactor at 130 o C heating reaction 4h, cooled to 110 o After C decompression distills off excessive triethylenetetramine and dimethylbenzene, obtains imidazoline intermediate; Then 1mol imidazoline intermediate and 1.5mol thiosemicarbazide are added in 1mol n-octanol and transferred in the there-necked flask, 140 in the reactor o C After heating and reacting for 5 hours, vacuum distillation and recrystallization several times to obtain a yellow solid which is the corrosion inhibitor.

[0047] Using the weightlessness method, at 130 o Under C, put Q235 steel in H containing 100mg / L corrosion inhibitor 2 S, CO 2 In the coexisting hydrochloric acid solution, the corrosion treatment was carried out for 72 hours, and compared with the corrosion treatment of Q235 steel without corrosion inhibitor. The weight loss te...

Embodiment 2

[0049] 1.5mol myristic acid and 1.5mol triethylenetetramine were added to 1.5mol xylene, and the above mixture was transferred to a three-necked flask, and in the reactor at 140 o C heating reaction 3h, cooled to 110 o After C decompression distills off excessive triethylenetetramine and dimethylbenzene, obtains imidazoline intermediate; Then imidazoline intermediate and 1.5mol thiosemicarbazides are added in 1.5mol n-octanol and transferred in the there-necked flask, 130 in the reactor o After heating and reacting in C for 6 hours, the yellow solid obtained by vacuum distillation and recrystallization several times is the corrosion inhibitor.

[0050] According to the method of Example 1 at a temperature of 140 ° C, the corrosion inhibition performance was tested and compared. The experimental data showed that after adding the corrosion inhibitor, the corrosion rate of Q235 steel was 0.045mm / a, which was lower than the national corrosion standard of 0.076mm / a. a.

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Abstract

The invention discloses a preparation method and application of a high-temperature high-pressure corrosion inhibitor capable of resisting corrosion by H2S and CO2. The corrosion inhibitor is prepared from the following raw materials by mol: 10 to 26% of triethylene tetramine, 10 to 26% of myristic acid, 20 to 36% of xylene, 25 to 35% of thiosemicarbazide and 10 to 30% of polyol. The preparation method for the corrosion inhibitor comprises the following steps: step 1, subjecting myristic acid and triethylene tetramine to amidation so as to obtain an imidazoline intermediate; and step 2, subjecting the imidazoline intermediate and thiosemicarbazide to a condensation reaction so as to obtain the corrosion inhibitor. The preparation method for the corrosion inhibitor is simple and does not need special equipment; the prepared corrosion inhibitor has excellent corrosion inhibition efficiency and corrosion resistant, is applicable to yield increase operation in an oil and gas well containing H2S with a concentration of as high as more than 30 mg / L and saturated CO2; and after addition of the corrosion inhibitor, the corrosion rate of a steel disc is less than 0.05 mm / a, which accords with national corrosion standards in China.

Description

technical field [0001] The invention relates to the technical field of oilfield chemical products, in particular to an anti-H 2 S, CO 2 Preparation method and application of high temperature and high pressure corrosion inhibitor for corrosion. Background technique [0002] With the increasingly intense global energy supply and demand, countries around the world have begun to expand energy sources or adjust energy consumption structures to alleviate the contradiction between non-renewable energy and people's increasing energy consumption. As an important strategic resource, oil and gas have always been highly valued by countries all over the world, but with the limited exploitation of new oil and gas resources, high H content 2 S, CO 2 , Cl - Oil and gas fields with harsher media such as hydrates and hydrates have emerged one after another. [0003] High in H 2 S, CO 2 Oil and gas fields are mainly distributed in the Sichuan Basin, where 2 / 3 of the oil and gas fields c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/54C07D233/54
CPCC07D233/54C09K8/54
Inventor 郭瑛姚雷姚吉豪
Owner DONGGUAN ZHIYUAN ELECTRONICS TECH
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