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

A corrosion inhibitor and wellbore technology, applied in wellbore/well parts, earthwork drilling and production, etc., can solve problems such as oil casing corrosion, and achieve the effects of low cost, uniform film formation, and simple and easy process
CN101624518AActive Publication Date: 2010-01-13PETROCHINA CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
PETROCHINA CO LTD
Publication Date
2010-01-13

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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.
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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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