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Inhibitor suitable for corrosion prevention of pitshaft of CO2 driving extraction shaft

A corrosion inhibitor and wellbore technology, which is applied in wellbore/well components, earthwork drilling, etc., can solve problems such as corrosion of oil casing and casing, and achieve the effects of low cost, simple preparation method and uniform film formation.

Active Publication Date: 2012-01-18
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem in high CO 2 Corrosion of oil and casing under partial pressure environment, and provide a suitable for CO 2 Corrosion Inhibitor for Wellbore Anticorrosion in Flooding and Production Wells

Method used

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  • Inhibitor suitable for corrosion prevention of pitshaft of CO2 driving extraction shaft
  • Inhibitor suitable for corrosion prevention of pitshaft of CO2 driving extraction shaft

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Effect test

specific Embodiment approach 1

[0007] Specific implementation mode 1: This implementation mode is applicable to CO 2 The anticorrosion agent for wellbore anticorrosion of flooding production well consists of the following components by weight percentage: 15% diethylenetriamine, 20% sebacic acid, 10% thiourea, 4% dodecyl dimethyl benzyl ammonium chloride, 1% stearyl polyoxyethylene ether, 5% absolute ethanol, 45% water.

[0008] This applies to CO 2 The sebacic acid and diethylenetriamine in the anticorrosion formulation of wellbore anticorrosion in production wells are used to synthesize polyamide prepolymer, and the reaction formula is as follows:

[0009]

[0010] As a synergist, thiourea reacts further with polyamide prepolymer to generate thiourea-modified polyamide. The reaction formula is as follows:

[0011]

[0012] Thiourea-modified polyamide is composed of polar groups centered on O, N, and S atoms and non-polar groups composed of C, and H atoms; N, O, and S atoms are all relatively electr...

specific Embodiment approach 2

[0015] Specific implementation mode 2: This implementation mode is applicable to CO 2 The anticorrosion agent for wellbore anti-corrosion of flooding production well consists of the following components in percentage by weight: 18% diethylenetriamine, 25% sebacic acid, 12% thiourea, 5% dodecyl dimethyl benzyl ammonium chloride, 2% stearyl polyoxyethylene ether, 8% absolute ethanol, 30% water.

[0016] The preparation method of the corrosion inhibitor of this embodiment is the same as the first embodiment.

[0017] The corrosion inhibitor of this embodiment is used in downhole CO 2 Under the environment of partial pressure of 0.2MPa~2MPa, the corrosion inhibition rate can reach 93%, and there is no pitting corrosion; the film is formed uniformly on the metal pipe wall, and the adsorption effect is good; 99% demulsification, no effect on the post-dehydration treatment of crude oil. The injection process of the corrosion inhibitor is simple and easy. It is injected from the an...

specific Embodiment approach 3

[0018] Specific implementation mode three: this implementation mode is applicable to CO 2 The anticorrosion agent for wellbore anticorrosion of flooding production well consists of the following components by weight percentage: 23% diethylenetriamine, 30% sebacic acid, 15% thiourea, 7% dodecyl dimethyl benzyl ammonium chloride, 3% stearyl polyoxyethylene ether, 10% absolute ethanol, 12% water. The preparation method of the corrosion inhibitor of this embodiment is the same as the first embodiment.

[0019] The corrosion inhibitor of this embodiment is used in downhole CO 2 Under the environment of partial pressure of 0.2MPa~2MPa, the corrosion inhibition rate can reach 96%, and there is no pitting corrosion; the film is formed uniformly on the metal pipe wall, and the adsorption effect is good; 99% demulsification, no effect on the post-dehydration treatment of crude oil. The injection process of the corrosion inhibitor is simple and easy. It is injected from the annulus of...

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Abstract

The invention relates to an inhibitor suitable for corrosion prevention of a pitshaft of a CO2 driving extraction shaft, which belongs to the oil filed chemical field and solves the problem that an oil sleeve is corroded in the high CO2 partial pressure environment. The inhibitor comprises the following components in percentage by weight: 15 to 23 percent of diethylenetriamine, 20 to 30 percent of decanedioic acid, 10 to 15 percent of thiourea, 4 to 7 percent of dodecyl dimethyl benzyl ammonium chloride, 1 to 3 percent of stearyl alcohol polyethenoxy ether, 5 to 10 percent of absolute ethyl alcohol and 12 to 45 percent of water. In the high CO2 partial pressure environment, the inhibitor has over 90 percent of corrosion inhibition rate without pitting corrosion, evenly forms a film on a metal tube with good adsorption effect, and has good emulsion breaking property on crude oil with 100 percent of emulsion breaking underground for two hours, no influence on the post dewatering treatment of the crude oil, as well as the advantages of low toxicity, environmental protection, simple preparation method and low cost.

Description

technical field [0001] The invention belongs to the field of oil field chemistry, and in particular relates to a corrosion inhibitor used for wellbore anticorrosion. Background technique [0002] In the field of low permeability oilfield development, CO 2 Oil flooding technology is being widely used. in CO 2 During the specific construction process of oil flooding technology, due to gas channeling and other reasons, the CO in the wellbore of the production well 2 The content can reach 98%, CO 2 The partial pressure is above 0.2MPa. Since the oil casing of the existing oil well is mainly made of ordinary carbon steel pipe, in this high CO 2 Under the corrosive environment formed by the partial pressure, the surface of the steel pipe is corroded very severely. Once the surface of the steel pipe is corroded, it will affect the normal production and cause CO 2 The development of oil flooding technology is slow. Contents of the invention [0003] The purpose of the prese...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/54
Inventor 刘合周万福高飞高纯良马文海马品刚贺海军翟庆红
Owner PETROCHINA CO LTD
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