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A kind of corrosion inhibitor and its application and a kind of anticorrosion method of oilfield water injection wellbore

A corrosion inhibitor and ethylene oxide technology, which is applied in earthwork drilling, wellbore/well parts, etc., can solve the problems of water eutrophication, environmental pollution, high temperature and high pressure resistance, etc., and achieve good corrosion inhibition Performance, simple composition, corrosion inhibitory effect

Active Publication Date: 2018-05-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Although some corrosion inhibitors for water injection wellbore have been developed, the composition of existing corrosion inhibitors is complex, which increases the difficulty of on-site operation, and some components have obvious adverse effects on the environment, such as: phosphate-containing corrosion inhibitors Extensive use of oilfield water system leads to intensified microbial reproduction in the oilfield water system, and the discharge of phosphorus-containing sewage leads to eutrophication of the water body and environmental pollution; moreover, with the increasing difficulty of crude oil extraction, the extensive use of steam flooding to improve oil recovery has a negative effect on corrosion inhibition. The requirements for high temperature and high pressure resistance of corrosion inhibitors are getting higher and higher, and corrosion inhibitors are required to work stably even at 200°C

Method used

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  • A kind of corrosion inhibitor and its application and a kind of anticorrosion method of oilfield water injection wellbore
  • A kind of corrosion inhibitor and its application and a kind of anticorrosion method of oilfield water injection wellbore
  • A kind of corrosion inhibitor and its application and a kind of anticorrosion method of oilfield water injection wellbore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] (1) Add 2-heptadecenyl imidazoline quaternary ammonium salt ( Among them, R 12 is heptadecenyl, A 2 Benzyl, X 3 chlorine atom) and benzenesulfonic acid, thereby obtaining test water, wherein, the content of 2-heptadecenyl imidazoline quaternary ammonium salt is 15mg / L, and the content of benzenesulfonic acid is 60mg / L.

[0075] (2) Use the following method to evaluate the corrosion inhibition performance of the corrosion inhibitor.

[0076] Hang the carbon steel test piece that has been degreased, cleaned, dried and weighed in a 1000mL autoclave; use nitrogen to remove the air in the bottle, then add 500mL of test water obtained in step (1), seal the test bottle, and fill it with nitrogen. Press to the test pressure (50kgf / cm 2 ); with stirring, the temperature was raised to the test temperature, and the constant temperature test was carried out for 24 hours.

[0077] After cooling down to room temperature, take out the test piece, wash away the corrosion products...

Embodiment 2

[0082] (1) Test water was prepared in the same manner as in Example 1, except that the content of 2-heptadecenyl imidazoline was 15 mg / L, and the content of benzenesulfonic acid was 120 mg / L.

[0083] (2) The same method as that in step (2) of Example 1 was used to evaluate the corrosion inhibition performance of the corrosion inhibitor, and the results are listed in Table 2.

Embodiment 3

[0103] (1) Add 1-aminoethyl-2-heptadecenyl imidazoline quaternary ammonium salt ( Among them, R 13 is heptadecenyl, R 14 is ethylene, A 3 is benzyl, X 4 chlorine atom) and benzenesulfonic acid, thereby obtaining test water, wherein, the content of 1-aminoethyl-2-heptadecenyl imidazoline quaternary ammonium salt is 20mg / L, and the content of benzenesulfonic acid is 60mg / L.

[0104] (2) The same method as that in step (2) of Example 1 was used to evaluate the corrosion inhibition performance of the corrosion inhibitor, and the results are listed in Table 2.

[0105] Table 2

[0106] serial number

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Abstract

The invention discloses a corrosion inhibitor and its application. The corrosion inhibitor contains benzenesulfonic acid and at least one nitrogen-containing compound, and the nitrogen-containing compound is selected from imidazoline-type quaternary ammonium salts and quinones containing ethylene oxide substituents. phylloline. The invention also discloses an anti-corrosion method for oilfield water injection wellbore, which includes sending the corrosion inhibitor according to the invention into the oilfield water injection wellbore. The corrosion inhibitor according to the present invention has good corrosion inhibition performance, and can effectively inhibit corrosion even for components operating under high temperature and high pressure, such as oil field water injection well shafts. The corrosion inhibitor according to the invention does not contain phosphorus-containing compounds, and the toxicity of each component is low, so it is an environment-friendly product. In addition, according to the corrosion inhibitor of the present invention, the composition is simple, which reduces the difficulty of on-site operation.

Description

technical field [0001] The invention relates to a corrosion inhibitor and an application thereof, and also relates to an anti-corrosion method for an oil field water injection wellbore. Background technique [0002] At present, most oil fields in my country have entered the middle and late stage of development. With the increasing difficulty of crude oil extraction, a large number of steam flooding is used to improve oil recovery, and the problem of high temperature corrosion of water injection wellbore is becoming more and more serious, which not only makes oil well pipelines and supporting facilities severely corroded and cannot operate normally , and block the pores of the oil layer, reduce the permeability of the oil layer, and seriously affect the production and development of the oil field. [0003] Therefore, the development of corrosion inhibitors that can effectively inhibit the corrosion of water injection wellbore has become a research hotspot. [0004] CN1754991A...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F11/00C09K8/54
CPCC23F11/141C23F11/149
Inventor 王征王秀
Owner CHINA PETROLEUM & CHEM CORP