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Microgel stabilizer with sustained release performance and preparation method thereof

A slow-release performance, microgel technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as long stabilization time, and achieve the effect of inhibiting thermal oxidation chain scission reaction

Inactive Publication Date: 2017-01-11
LIAONING LIAOHE OILFIELD KANGDA IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to stabilize the HPAM / chromium lactate microgel system for a longer period of time with only a limited amount of stabilizer

Method used

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  • Microgel stabilizer with sustained release performance and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Add sodium thiosulfate (1.5g), formaldehyde (2.5g), urea (6g), and polyethylene glycol 400 (14g) into water (350g) in sequence, and stir for 60 minutes to mix the compounds uniformly to form solution A .

[0031] Add aluminum nitrate nonahydrate (2.6g) and magnesium nitrate hexahydrate (4.4g) into water (90g) from which carbon dioxide has been removed to form a mixed solution. While stirring the mixed solution, use 5wt% NaOH to adjust the pH to 10.0, and place the mixed solution at 70°C , and reacted for 2 hours under nitrogen protection to form a mixed solution B.

[0032] The solution A and the mixed solution B were mixed evenly in a weight ratio of 1:1, placed at 90° C., stirred and reacted for 4 hours, and the mixed solution C was obtained. The mixed solution C was centrifuged at 5000 rpm for 10 minutes, the solid particles in the mixed solution were discarded, and the remaining colloidal liquid was left for use.

Embodiment 2

[0034] Add sodium thiosulfate (2.3g), formaldehyde (2.1g), urea (7.5g), and polyethylene glycol 800 (16g) into water (650g) in sequence, and stir for 45 minutes to mix the compounds uniformly to form a solution a.

[0035] Add aluminum nitrate nonahydrate (2.75g) and magnesium nitrate hexahydrate (4.1g) into water (55g) from which carbon dioxide has been removed to form a mixed solution. While stirring the mixed solution, use 10wt% NaOH to adjust the pH to 8.5, and place the mixed solution at 80°C , and reacted for 10 hours under the protection of nitrogen to form a mixed solution B.

[0036]The solution A and the mixed solution B were mixed uniformly at a weight ratio of 2:1, placed at 60°C, stirred and reacted for 2.8 hours, and the mixed solution C was obtained. The mixed solution C was centrifuged at 3000 rpm for 10 minutes, the solid particles in the mixed solution were discarded, and the remaining colloidal liquid was left for use.

Embodiment 3

[0038] Add sodium thiosulfate (3.2g), formaldehyde (1.8g), urea (9g), and polyethylene glycol 600 (17g) into water (about 500g) in sequence, and stir for 30 minutes to mix the compounds uniformly to form a solution a.

[0039] Add aluminum nitrate nonahydrate (2.91g) and magnesium nitrate hexahydrate (3.85g) into water (60g) from which carbon dioxide has been removed to form a mixed solution. While stirring the mixed solution, use 15wt% NaOH to adjust the pH to 9.0, and place the mixed solution at 90°C , and reacted for 20 hours under the protection of nitrogen to form a mixed liquid B.

[0040] The solution A and the mixed solution B were mixed uniformly in a weight ratio of 3:1, placed at 70° C., stirred and reacted for 3 hours, and the mixed solution C was obtained. The mixed solution C was centrifuged at 3500 rpm for 10 minutes, the solid particle precipitation in the mixed solution was discarded, and the remaining colloidal liquid was left for use.

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Abstract

The invention relates to a microgel stabilizer with slow release performance and a preparation method of the microgel stabilizer. According to the microgel stabilizer, sodium thiosulfate, formaldehyde, urea, polyethylene glycol, aluminum nitrate nonahydrate and magnesium nitrate hexahydrate are adopted as reaction raw materials to be reacted to generate host-guest complex structure compound of thiosulphate-magnesium aluminum hydrotalcite, the thiosulphate in the host-guest complex structure compound can be released from hydrotalcite layer boards through ion exchange reaction, and the speed of the thiosulphate released from the hydrotalcite layer boards is slow. In addition, the polyethylene glycol is polyhydric linear polymer, and hydroxide radical of the polyethylene glycol is interacted with the hydroxide radical of the surface of the hydrotalcite layer boards to package the outer surface of the hydrotalcite of thiosulphate embedded layer to form a new blocked layer to further control and reduce the release speed of the thiosulphate.

Description

[0001] Technical field: [0002] The invention provides a stabilizer for improving the stability of a hydrolyzed polyacrylamide / chromium lactate microgel system and a preparation method of the stabilizer, belonging to the field of organic-inorganic composite materials. [0003] Background technique: [0004] Hydrolyzed polyacrylamide / chromium lactate microgel is a commonly used profile control and oil displacement agent in oil recovery operations to enhance oil recovery. Polyacrylamide (PAM) is a general term for acrylamide homopolymer or its copolymerization with other monomers. The amide group in the polyacrylamide structural unit makes PAM easy to form hydrogen bonds, and has good water solubility and good High chemical activity. Polyacrylamide used in oil recovery operations generally undergoes partial hydrolysis, during which the amide groups on polyacrylamide chains can be hydrolyzed into carboxyl groups. The carboxyl group in this partially hydrolyzed polyacrylamide (H...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/58C08L71/08C08K3/30C08K3/24C08K3/22C08K5/07C08K5/21
CPCC09K8/58
Inventor 李文卓许定佳富强苗少峰郑永付祁文赵莹莹张松沈丁丰
Owner LIAONING LIAOHE OILFIELD KANGDA IND GRP
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