Deoxidant for oil-displacing polymer and preparation method of deoxidant

An oil-displacing polymer and oxygen scavenger technology, applied in the field of oilfield chemistry, can solve problems such as the decrease of residual oxygen concentration, the destruction of polymer molecular structure, and the decrease of polymer viscosity.

Active Publication Date: 2018-04-24
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, people mainly use reducing inorganic salts such as sodium sulfite and sodium bisulfite as oxygen scavengers for oil displacement polymers. These reducing compounds are added to the solution and react violently with dissolved oxygen in the solution in a short period of time, ther

Method used

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  • Deoxidant for oil-displacing polymer and preparation method of deoxidant

Examples

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Example Embodiment

[0008] (1) Preparation of carbohydrazide sulfate

[0009] The sulfuric acid solution was added dropwise to the carbohydrazide solution, stirring while dripping, after the addition, the precipitate was filtered and dried to obtain carbohydrazide sulfate; the concentration of sulfuric acid was 100~500g / L, and the concentration of carbohydrazide was 50~ 400g / L, the molar ratio of carbohydrazide to sulfuric acid is 1:(0.5~3);

[0010] (2) Preparation of oxygen scavenger microcapsules

[0011] Dissolve hydroxypropyl methyl cellulose phthalate in acetone, add carbohydrazide sulfate, thiourea and erythorbic acid to the acetone solution of hydroxypropyl methyl cellulose phthalate, Ultrasonic dispersion, the obtained system is the dispersed phase; the concentration of hydroxypropyl methyl cellulose phthalate in acetone is 50 ~ 250 g / L, carbamoyl sulfate and hydroxypropyl methyl cellulose phthalate The mass ratio of acid ester is 1:(0.04~1), and the mass ratio of carbhydrazide sulfate, thiou...

Example Embodiment

detailed description

[0028] The experimental methods used in the following examples are conventional methods unless otherwise specified.

[0029] The materials and reagents used in the following examples can be obtained from commercial sources unless otherwise specified.

[0030] The present invention will be further described below in conjunction with specific embodiments, but the protection scope of the present invention is not limited to this.

Example Embodiment

[0031] Example 1:

[0032] An oxygen scavenger for oil-displacing polymers and a preparation method thereof, including the following steps:

[0033] (1) Preparation of carbohydrazide sulfate

[0034] Dissolve 20g carbohydrazide in 100mL water to prepare a carbohydrazide solution; dissolve 45g sulfuric acid in 180mL water to prepare a sulfuric acid solution; add the sulfuric acid solution dropwise to the carbohydrazide solution, and stir while dripping. After the addition is complete, the precipitation Filter and dry to obtain carbohydrazide sulfate;

[0035] (2) Preparation of oxygen scavenger microcapsules

[0036] Dissolve 10g of hydroxypropyl methylcellulose phthalate in 60mL of acetone, add 25g of carbhydrazide sulfate, 7.5g of thiourea and 3.5g of isoascorbic acid to the hydroxypropyl methylcellulose phthalate Disperse the acid ester in acetone solution ultrasonically to obtain the dispersed phase;

[0037] Dissolve 10g Span-80 and 1.2g magnesium oleate in 450mL No. 5 white oil to...

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Abstract

The invention relates to a deoxidant for an oil-displacing polymer and a preparation method of the deoxidant, and belongs to the technical field of oilfield chemistry. The preparation method comprisesthe following steps: reacting sulfuric acid with carbohydrazide to prepare carbohydrazide sulfate; dispersing the carbohydrazide sulfate, thiourea and isoascorbic acid into an acetone solution of hydroxypropyl methyl cellulose phthalate, taking a mixture as a dispersion phase and taking white oil dissolved with a surfactant as a continuous phase; adding the dispersion phase into the continuous phase under stirring to prepare stable emulsion; on the basis of the stable emulsion, raising the temperature to evaporate acetone and obtain a microcapsule deoxidant. A deoxidant product disclosed by the invention has the advantages of good deoxygenation effect, controllable deoxygenation time, small influence on the viscosity of a polymer and suitability for being used as a deoxygenation aid for ahigh-temperature oil displacing polymer.

Description

technical field [0001] The invention relates to an oxygen scavenger for oil displacement polymers and a preparation method thereof, belonging to the technical field of oil field chemistry. Background technique [0002] Petroleum is an important strategic resource, and its exploitation and utilization play an important role in the development of the national economy. At present, most of the developed oilfields in my country have entered the middle and late stage of water injection development, and only through the tertiary oil recovery technology can the production be stabilized. Chemical flooding is one of the main tertiary oil recovery technologies in my country, which has brought us good economic and social benefits. In the implementation of chemical flooding, water-soluble polymer is one of the key chemical agents. Through the viscosification of the polymer, the swept volume of the displacement fluid can be enlarged, and the purpose of greatly improving oil recovery can ...

Claims

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Application Information

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IPC IPC(8): C09K8/588B01J13/02
CPCB01J13/02C09K8/588
Inventor 曹杰宋涛孙明波吕飞曹涵王彦玲
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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