Method for preparing AA/AM/MAH-beta-CD ternary oil-displacing agent

An oil-displacing agent and initiator technology, which is applied in the field of preparation of AA/AM/MAH-β-CD ternary oil-displacing agent, can solve the problems of high cost, complicated method of modifying cyclodextrin substances and the like, and achieves low cost , The effect of temperature resistance and salt resistance is remarkable, and the yield is high.

Inactive Publication Date: 2015-09-02
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] As can be seen by the above prior art scheme: the method for preparing modified cyclodextrin substance is more complicated, and the cost is high

Method used

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  • Method for preparing AA/AM/MAH-beta-CD ternary oil-displacing agent
  • Method for preparing AA/AM/MAH-beta-CD ternary oil-displacing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The preparation method of the AA / AM / MAH-β-CD ternary oil-displacing agent of the present invention is as follows:

[0029] (1) Prepare modified cyclodextrin, dissolve β-cyclodextrin and maleic anhydride in DMF, the weight ratio of cyclodextrin to maleic anhydride is 3:6, and the weight to volume ratio of cyclodextrin to DMF is 3:40g / ml; then stir the reaction at 70°C for 15 hours, cool the reaction product to room temperature and add chloroform to a white precipitate, filter the precipitate and wash with acetone, and dry the filter cake in an oven to obtain maleic anhydride modification Β-cyclodextrin;

[0030] (2) Add acrylic acid, acrylamide and the maleic anhydride-β-cyclodextrin prepared in step (1) into the reactor, react under the protection of nitrogen, add sodium hydroxide to adjust the pH to 6-7, and then react Add the initiator ammonium persulfate-sodium bisulfite and disodium ethylenediaminetetraacetate (EDTA-2Na) which is resistant to interference by metal ions,...

Embodiment 2

[0037] The preparation method of the AA / AM / MAH-β-CD ternary oil-displacing agent of the present invention is as follows:

[0038] (1) Prepare modified cyclodextrin, dissolve β-cyclodextrin and maleic anhydride in DMF, the weight ratio of cyclodextrin to maleic anhydride is 8:3, and the weight to volume ratio of cyclodextrin to DMF is 8:20g / ml; Then, the reaction was stirred at 90℃ for 5 hours, the reaction product was cooled to room temperature and then added to chloroform, white precipitation appeared, the precipitate was filtered and washed with acetone, the filter cake was dried in an oven to obtain maleic anhydride modification Β-cyclodextrin;

[0039] (2) Add acrylic acid, acrylamide and the maleic anhydride-β-cyclodextrin prepared in step (1) into the reactor, react under the protection of nitrogen, add sodium hydroxide to adjust the pH to 7-9, and then react Add the initiator ammonium persulfate-sodium bisulfite and disodium ethylenediaminetetraacetate (EDTA-2Na), which is ...

Embodiment 3

[0046] The preparation method of the AA / AM / MAH-β-CD ternary oil-displacing agent of the present invention is as follows:

[0047] (1) Prepare modified cyclodextrin, dissolve β-cyclodextrin and maleic anhydride in DMF, the weight ratio of cyclodextrin to maleic anhydride is 5.68:4.9, and the weight to volume ratio of cyclodextrin to DMF is 5.68: 30g / ml; then stir the reaction at 80°C for 10 hours, cool the reaction product to room temperature and add chloroform to a white precipitate, filter the precipitate and wash with acetone, dry the filter cake in an oven to obtain maleic anhydride modification Β-cyclodextrin;

[0048] (2) Add acrylic acid, acrylamide and the maleic anhydride-β-cyclodextrin prepared in step (1) into the reactor, react under the protection of nitrogen, add sodium hydroxide to adjust the pH to 9-10, and then react Add the initiator ammonium persulfate-sodium bisulfite and disodium ethylenediaminetetraacetate (EDTA-2Na), which is resistant to metal ion interferen...

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Abstract

The invention discloses a method for preparing an AA/AM/MAH-beta-CD ternary oil-displacing agent. Although a method for synthesizing a polymer through the cyclodextrin is utilized, but the method for synthesizing a copolymer through the maleic anhydride is not reported; because the cyclodextrin has special characteristics of external hydrophilic and internal lyophobic, the cyclodextrin is grafted to a polymer chain so that the viscosity of the polymer water solution is increased and the supramolecular chemistry is introduced into the petroleum industry. The method has the advantages that the method for synthesizing the unsaturated cyclodextrin monomer is simple, the temperature-resistant and the salt-resistant effect are obvious, the yield is high and the cost is low. The unsaturated cyclodextrin monomer is grafted to the copolymer chain through a simple method, the temperature-resistant and the salt-resistant research (the salt used in the experiment includes sodium chloride and calcium chloride) are processed, and the experiment result shows that the temperature-resistant and the salt-resistant property of the ternary copolymer are increased due to the introduction of the cyclodextrin.

Description

Technical field [0001] The invention relates to the technical field of chemical oil displacement agents, in particular to a preparation method of an AA / AM / MAH-β-CD ternary oil displacement agent. Background technique [0002] Oil-displacing agent is a kind of auxiliary agent used to improve oil recovery during oil drilling. Commonly used are polymer oil-displacing agents. For example, ultra-high molecular weight polyacrylamide, with a 0.05% aqueous solution, can penetrate into the rock crevices of the oil layer to produce 20% to 30% more oil, roughly 10 barrels (1590L) of crude oil can be used for every 1kg of oil displacing agent. The segmented oil displacement of polymer solution and surfactant (microemulsion of petroleum sulfonate and alcohol) developed in recent years can displace the crude oil in the capillary of the formation with almost 100% efficiency. [0003] Ternary oil-displacing agent is a commonly used polymer oil-displacing agent. AA (acrylic acid) / AM (acrylamide) / ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F220/06C08F220/56C08B37/16C09K8/588
Inventor 何毅张春丽徐中浩吴凤施太和
Owner SOUTHWEST PETROLEUM UNIV
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