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Micro-nanocapsule for deoxidizing of oil-displacement polymer and preparation method of micro-nanocapsule

A kind of oil displacement polymer, micro-nano technology, applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of destroying polymer molecular structure, polymer viscosity decrease, residual oxygen concentration decrease, etc., with little impact , Deoxygenation time controllable, excellent deoxygenation effect

Active Publication Date: 2019-05-28
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Micro-nanocapsule for deoxidizing of oil-displacement polymer and preparation method of micro-nanocapsule

Examples

Experimental program
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Effect test

preparation example Construction

[0010] (2) Preparation of oxygen scavenger microcapsules

[0011] Add hydrophobic nanoparticles (Aerosil R202) to the solution obtained in step (1), use a Bella-Rocket stirrer at 5000-20000r / min, stir for 30-180s, heat the obtained product to 40-80°C and react for 1-8h, The oxygen-scavenging microcapsules are obtained; the mass ratio of acrylamide and hydrophobic nano silicon dioxide is 1:(0.1-3).

[0012] According to the present invention, preferably, in step (1), the cationic monomer is methacryloyloxyethyltrimethylammonium chloride, acryloyloxyethyltrimethylammonium chloride, vinylpyridine, vinylimidazole one of

[0013] The preferred mass ratio of acrylamide, cationic monomer, azobisisobutylamidine hydrochloride, isoascorbic acid and deionized water is 1:(3~5):(0.001~0.01):(0.1~1):( 15~20);

[0014] The preferred pH is 7-9;

[0015] According to the present invention, preferably, the stirring speed described in step (2) is 15000-18000r / min, and the stirring time is 60...

specific Embodiment approach

[0024] The experimental methods used in the following examples are conventional methods unless otherwise specified.

[0025] The materials and reagents used in the following examples can be obtained from commercial sources unless otherwise specified.

[0026] 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

[0028] A micro-nanocapsule for deoxygenation of an oil-displacement polymer and a preparation method thereof, comprising the following steps:

[0029] (1) Preparation of monomer, initiator, oxygen scavenger mixed solution

[0030] In a glove box at 20°C under a nitrogen atmosphere, add 5g of acrylamide and 15g of methacryloyloxyethyltrimethylammonium chloride to deionized water, adjust the pH to 7, stir until all the raw materials are dissolved, then add 0.03g of azobisisobutylamidine hydrochloride, 0.5g of isoascorbic acid, and 75g of deionized water.

[0031] (2) Preparation of oxygen scavenger microcapsules

[0032] Add 5 g of hydrophobic nano-silica to the solution in step (1), set the Bella-Rocket agitator at a speed of 16000 r / min, and stir for 60 s. The product was placed in an oven at 50°C and reacted for 4 hours to obtain oxygen scavenger microcapsules.

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Abstract

The invention relates to a micro-nanocapsule for deoxidizing of an oil-displacement polymer and a preparation method of the micro-nanocapsule and belongs to the technical field of oilfield chemistry.Hydrophobic nano-silica particles are wrapped with acrylamide, a cationic monomer, 2,2'-azobis[2-methylpropionamidine] dihydrochloride and an erythorbic acid aqueous solution under the stirring condition, temperature-increasing polymerization is conducted, and thus a microencapsulated deoxidizer is prepared. A deoxidizer product has a good deoxidizing effect and has little influence on the viscosity of the polymer, and because of the interaction between the hydrophobic nanoparticles, the capsule is good in temperature resistance and suitable for serving as a deoxidizing assistant for the oil displacement polymer in a high-temperature deep oil reservoir.

Description

technical field [0001] The invention relates to a micro-nano capsule used for oil displacement polymer oxygen removal 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 improvi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/588C09K8/58C08F220/34C08F220/56
Inventor 宋涛王彦玲曹杰米恒坤雷天猛冯奇
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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