A kind of preparation method of oxygen scavenger for oil displacement polymer

A technology of oil displacement polymer and oxygen scavenger, which is applied in the field of oilfield chemistry, and can solve the problems of destroying the molecular structure of polymers, decreasing the concentration of residual oxygen, and decreasing the viscosity of polymers, etc.

Active Publication Date: 2020-06-19
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • 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, thereby making The residual oxygen concentration drops significantly, however, during the oxygen removal process, the violent redox reaction produces a large number of free radicals, which can destroy the molecular structure of the polymer, thereby greatly reducing the viscosity of the polymer

Method used

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  • A kind of preparation method of oxygen scavenger for oil displacement polymer

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preparation example Construction

[0009] A preparation method for an oxygen scavenger for oil displacement polymer:

[0010] (1) preparation of sulfuric acid carbohydrazide

[0011] Add the sulfuric acid solution to the carbohydrazide solution dropwise, and stir while adding. After the dropwise addition, filter and dry the precipitate to obtain the sulfuric acid carbohydrazide; the concentration of sulfuric acid is 100-500g / L, and the concentration of carbohydrazide is 50- 400g / L, the molar ratio of carbohydrazide to sulfuric acid is 1:(0.5~3);

[0012] (2) Preparation of oxygen scavenger microcapsules

[0013] Dissolve hydroxypropyl methylcellulose phthalate in acetone, add carbohydrazide sulfate, thiourea and isoascorbic acid to the acetone solution of hydroxypropyl methylcellulose phthalate, Ultrasonic dispersion, the resulting system is the dispersed phase; the concentration of hydroxypropyl methylcellulose phthalate in acetone is 50-250g / L, sulfuric acid carbohydrazide and hydroxypropyl methylcellulose ...

specific Embodiment approach

[0030] The experimental methods used in the following examples are conventional methods unless otherwise specified.

[0031] The materials and reagents used in the following examples can be obtained from commercial sources unless otherwise specified.

[0032] The present invention will be further described below in conjunction with specific examples, but the protection scope of the present invention is not limited thereto.

Embodiment 1

[0034] A preparation method for an oxygen scavenger for oil displacement polymer, comprising steps as follows:

[0035] (1) preparation of sulfuric acid carbohydrazide

[0036] Dissolve 20g carbohydrazide in 100mL water to prepare carbohydrazide solution; dissolve 45g sulfuric acid in 180mL water to prepare sulfuric acid solution; Filter and dry to obtain carbohydrazide sulfate;

[0037] (2) Preparation of oxygen scavenger microcapsules

[0038] Dissolve 10 g of hydroxypropyl methylcellulose phthalate in 60 mL of acetone, add 25 g of carbohydrazine sulfate, 7.5 g of thiourea, and 3.5 g of isoascorbic acid to the hydroxypropyl methylcellulose phthalate In the acetone solution of the acid ester, ultrasonically disperse to obtain a dispersed phase;

[0039] Dissolve 10g Span-80 and 1.2g magnesium oleate in 450mL No. 5 white oil to obtain a continuous phase; at room temperature, at a stirring speed of 800r / min, slowly add the dispersed phase to the continuous phase, and then st...

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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 a preparation method of an oxygen scavenger used for oil displacement polymers, and belongs 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 be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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