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Preparation method and application of high temperature and high pressure corrosion inhibitor resistant to h2s and co2 corrosion

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, and achieve simple production process, good anti-corrosion effect, excellent corrosion resistance The effect of erosion efficiency

Active Publication Date: 2019-03-01
DONGGUAN ZHIYUAN ELECTRONICS TECH
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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 and high pressure corrosion inhibitor resistant to h2s and co2 corrosion
  • Preparation method and application of high temperature and high pressure corrosion inhibitor resistant to h2s and co2 corrosion

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preparation example Construction

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

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

[0031] In step S1, an amidation reaction between myristic acid and triethylenetetramine is used to obtain an imidazoline intermediate; the step is specifically: step S11, 10-26% triethylenetetramine and 10-26% dose of myristic acid are mixed together. Slowly add to 20-36% xylene for mixing, transfer the obtained above-mentioned mixture into a three-necked flask, and at a temperature of 40 o C-160 o In the heater of C, the reaction is carried out for 3-5 h, and the water generated in the reaction is steamed in an azeotropic form, and the amidation re...

Embodiment 1

[0046] 1 mol of myristic acid and 2 mol of triethylenetetramine were added to 1 mol of xylene, the above mixture was transferred to a three-necked flask, and in the reactor 130 o The reaction was heated at C for 4 h, cooled to 110 o After the excess triethylenetetramine and xylene were distilled off under reduced pressure, the imidazoline intermediate was obtained; then 1 mol of the imidazoline intermediate and 1.5 mol of thiosemicarbazide were added to 1 mol of n-octanol and transferred to the there-necked flask, 140 in the reactor o After C heating reaction for 5h, vacuum distillation for several times and recrystallization to obtain a yellow solid, which is the corrosion inhibitor.

[0047] Using the weightless method, at 130 o Under C, the Q235 steel was heated 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 the comparison was made with the Q235 steel without c...

Embodiment 2

[0049] 1.5 mol of myristic acid and 1.5 mol of triethylenetetramine were added to 1.5 mol of xylene, and the above mixture was transferred to a three-necked flask. o The reaction was heated at C for 3 h, cooled to 110 o C, after the excess triethylenetetramine and xylene were distilled off under reduced pressure, the imidazoline intermediate was obtained; then the imidazoline intermediate and 1.5 mol of thiosemicarbazide were added to 1.5 mol of n-octanol and transferred to a three-necked flask. 130 in the reactor o After C heating reaction for 6h, vacuum distillation and recrystallization for several times to obtain a yellow solid, which is the corrosion inhibitor.

[0050] According to the method of Example 1, the corrosion inhibition performance was tested and compared at a temperature of 140 °C. 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 0.0...

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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 fierce global energy supply and demand, countries around the world have begun to expand energy sources or adjust the energy consumption structure to alleviate the contradiction between non-renewable energy and people's increasing energy consumption. Oil and natural gas, as an important strategic resource, has 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 more severe media such as hydrates and hydrates have appeared one after another. [0003] High content of H 2 S, CO 2 Oil and gas fields are mainly distributed in the Sichuan Basin, and 2 / 3 of the...

Claims

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Application Information

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Patent Type & Authority Patents(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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