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Hydrogen sulfide corrosion inhibitor applied to thermal recovery of thickened oil and preparation method thereof

A heavy oil thermal recovery and corrosion inhibitor technology, applied in chemical instruments and methods, earthwork drilling, drilling composition, etc., can solve the problem of not many corrosion inhibitors, etc.

Active Publication Date: 2017-12-12
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many studies and applications of corrosion inhibitors, but there are not many corrosion inhibitors with strong adaptability to steam injection thermal recovery oil wells.

Method used

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  • Hydrogen sulfide corrosion inhibitor applied to thermal recovery of thickened oil and preparation method thereof
  • Hydrogen sulfide corrosion inhibitor applied to thermal recovery of thickened oil and preparation method thereof
  • Hydrogen sulfide corrosion inhibitor applied to thermal recovery of thickened oil and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The formula of the hydrogen sulfide corrosion inhibitor adopted in the thermal recovery of a kind of heavy oil is as follows (mass percentage):

[0026]

[0027]

[0028] According to "SY / T 5673--2000 Performance Evaluation Method of Corrosion Inhibitors for Oilfield Produced Water", the speed of the test piece in the autoclave is 200r / min, the hanging time is 72h, the ambient temperature is set at 160°C, and the corrosion inhibitor is added Drug concentration is 60mg / L. After the hanging test, the test piece was pickled, dried and weighed, and the corrosion inhibition efficiency of the corrosion inhibitor was calculated from the change of the mass of the test piece before and after.

[0029] Table 1 Comparison of corrosion inhibition effects of test pieces

[0030] experiment type

Embodiment 2

[0032] The formula of the hydrogen sulfide corrosion inhibitor adopted in the thermal recovery of a kind of heavy oil is as follows (mass percentage):

[0033]

[0034] According to "SY / T 5673--2000 Performance Evaluation Method of Corrosion Inhibitors for Oilfield Produced Water", the speed of the test piece in the autoclave is 200r / min, the hanging time is 72h, the ambient temperature is set at 160°C, and the corrosion inhibitor is added Drug concentration is 60mg / L. After the hanging test, the test piece was pickled, dried and weighed, and the corrosion inhibition efficiency of the corrosion inhibitor was calculated from the change of the mass of the test piece before and after.

[0035] Table 2 Comparison of corrosion inhibition effects of test pieces

[0036] experiment type

Embodiment 3

[0038] The formula of the hydrogen sulfide corrosion inhibitor adopted in the thermal recovery of a kind of heavy oil is as follows (mass percentage):

[0039]

[0040] According to "SY / T 5673--2000 Performance Evaluation Method of Corrosion Inhibitors for Oilfield Produced Water", the speed of the test piece in the autoclave is 200r / min, the hanging time is 72h, the ambient temperature is set at 160°C, and the corrosion inhibitor is added Drug concentration is 60mg / L. After the hanging test, the test piece was pickled, dried and weighed, and the corrosion inhibition efficiency of the corrosion inhibitor was calculated from the change of the mass of the test piece before and after.

[0041] Table 3 Comparison of corrosion inhibition effects of test pieces

[0042] experiment type

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PUM

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Abstract

The invention relates to a hydrogen sulfide corrosion inhibitor applied to thermal recovery of thickened oil and a preparation method thereof, belonging to the fields of formulas and technologies of chemical agents used for oil fields. The corrosion inhibitor comprises the following components in percentages by mass: 15% to 30% of stearic acid, 14% to 24% of diethylenetriamine, 5% to 15% of thiourea, 1% to 6% of an NPC-9 type surfactant and 30% to 60% of a formaldehyde aqueous solution. The preparation method comprises the following steps: (1) adding stearic acid and diethylenetriamine into a xylene solvent, carrying out heating to 150 to 160 DEG C, carrying out stabilizing for 2 to 3 h, then carrying out heating to 190 to 200 DEG C, carrying out a reaction for 3 h, and carrying out cooling so as to obtain an imidazoline stearate intermediate; (2) adding the imidazoline stearate intermediate, diethylenetriamine and thiourea into the xylene solvent, carrying out heating to 100 to 130 DEG C, carrying out a reaction for 4 to 5 h, and carrying out cooling so as to obtain aminoethylene-thioureidoimidazoline; and (3) uniformly mixing the formaldehyde aqueous solution with the NPC-9 type surfactant under stirring, adding aminoethylene-thioureidoimidazoline, and carrying out uniform mixing so as to obtain a required corrosion inhibitor. According to the invention, the preparation method is simple; and the corrosion inhibitor has the advantages of good temperature resistance, good compatibility with an additive, good adsorption effect and good corrosion inhibition effect.

Description

technical field [0001] The invention relates to a hydrogen sulfide corrosion inhibitor used in heavy oil thermal recovery and a preparation method thereof, in particular to a preparation method of the corrosion inhibitor, and belongs to the field of chemical formulation and technology for oilfields. Background technique [0002] Hydrogen sulfide is a highly toxic gas that is seriously harmful to the human body. Production practice shows that the corrosion rate of metals in acidic media is much higher than that in other media. With the deepening of oil and gas development, especially in thermal recovery of heavy oil, due to the injection of steam, crude oil and formation water The complex chemical reaction with rock minerals provides favorable conditions of high temperature and high pressure, which makes more hydrogen sulfide and carbon dioxide produced during the production of steam injection wells. Facing the problem of more and more corrosion of equipment and pipelines, i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/54
CPCC09K8/54C09K2208/32
Inventor 林日亿韩超杰翟翀王新伟杨德伟田鑫
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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