Preparation method of AA (acrylic acid)/AM (acrylamide)/AMPS (2-acrylamido-2-methylpropane sulfonic acid)/MAH (maleic anhydride)-beta-CD (cyclodextrin) quaternary oil displacement agent

An oil displacement agent, disodium ethylenediamine tetraacetate technology, applied in the field of preparation of AA/AM/AMPS/MAH-β-CD quaternary oil displacement agent, can solve the problem of complex and costly modification of cyclodextrin substances Advanced problems, to achieve the effect of enhanced oil recovery, low cost, and remarkable oil displacement effect

Inactive Publication Date: 2015-07-29
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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  • Preparation method of AA (acrylic acid)/AM (acrylamide)/AMPS (2-acrylamido-2-methylpropane sulfonic acid)/MAH (maleic anhydride)-beta-CD (cyclodextrin) quaternary oil displacement agent

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Experimental program
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Effect test

Embodiment 1

[0029] The preparation method of AA / AM / AMPS / MAH-β-CD quaternary oil displacement agent of the present invention is as follows:

[0030] (1) Prepare modified cyclodextrin, dissolve β-cyclodextrin and maleic anhydride in DMF, the weight ratio of cyclodextrin and maleic anhydride is 3:6, and the weight-to-volume ratio of cyclodextrin and DMF is 3: 40g / ml; then stirred and reacted at 70°C for 15 hours, cooled the reaction product to room temperature and added chloroform to form a white precipitate, filtered the precipitate and washed it with acetone, and dried the filter cake in an oven to obtain maleic anhydride modified β-cyclodextrin;

[0031] (2) Add acrylic acid, acrylamide, 2-acrylamide-2-methylpropanesulfonic acid and maleic anhydride-β-cyclodextrin prepared in step (1) into the reactor, react under nitrogen protection, add Adjust the pH to 6-8 with sodium hydroxide, then add the initiator ammonium persulfate-sodium bisulfite and disodium ethylenediaminetetraacetic acid (E...

Embodiment 2

[0038] The preparation method of AA / AM / AMPS / MAH-β-CD quaternary oil displacement agent of the present invention is as follows:

[0039] (1) Prepare modified cyclodextrin, dissolve β-cyclodextrin and maleic anhydride in DMF, the weight ratio of cyclodextrin and maleic anhydride is 8:3, and the weight-to-volume ratio of cyclodextrin and DMF is 8:20g / ml; then stirred and reacted at 90°C for 5 hours, cooled the reaction product to room temperature and added chloroform to form a white precipitate, filtered the precipitate and washed it with acetone, and dried the filter cake in an oven to obtain maleic anhydride modified β-cyclodextrin;

[0040] (2) Add acrylic acid, acrylamide, 2-acrylamide-2-methylpropanesulfonic acid and maleic anhydride-β-cyclodextrin prepared in step (1) into the reactor, react under nitrogen protection, add Adjust the pH to 7-9 with sodium hydroxide, then add the initiator ammonium persulfate-sodium bisulfite and disodium ethylenediaminetetraacetic acid (EDT...

Embodiment 3

[0047] The preparation method of AA / AM / AMPS / MAH-β-CD quaternary oil displacement agent of the present invention is as follows:

[0048] (1) Prepare modified cyclodextrin, dissolve β-cyclodextrin and maleic anhydride in DMF, the weight ratio of cyclodextrin and maleic anhydride is 5.68:4.9, and the weight-to-volume ratio of cyclodextrin and DMF is 5.68:30g / ml; then stirred and reacted at 80°C for 10 hours, cooled the reaction product to room temperature and added chloroform to form a white precipitate, filtered the precipitate and washed with acetone, dried the filter cake in an oven to obtain maleic anhydride modified β-cyclodextrin;

[0049] (2) Add acrylic acid, acrylamide, 2-acrylamide-2-methylpropanesulfonic acid and maleic anhydride-β-cyclodextrin prepared in step (1) into the reactor, react under nitrogen protection, add Adjust the pH to 8-10 with sodium hydroxide, then add the initiator ammonium persulfate-sodium bisulfite and disodium ethylenediaminetetraacetic acid (ED...

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Abstract

The invention discloses a preparation method of an AA (acrylic acid) / AM (acrylamide) / AMPS (2-acrylamido-2-methylpropane sulfonic acid) / MAH (maleic anhydride)-beta-CD (cyclodextrin) quaternary oil displacement agent. The preparation method has the advantages as follows: the synthetic method is simple, the oil displacement effect is remarkable, the yield is high and the cost is low. Cyclodextrin is grafted to a chain of a copolymer with a simple method, the research on temperature resistance, salt resistance and increase of oil recovery ratio is performed, salt used in an experiments comprises sodium chloride and calcium chloride, and experiment results show that the temperature resisting and salt resisting performance of the quaternary copolymer can be improved and the oil recovery ratio of the quaternary copolymer can be increased by means of introduction of 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 / AMPS / MAH-β-CD quaternary oil displacement agent. Background technique [0002] Oil displacement agent is an additive used to enhance oil recovery during oil drilling. Commonly used are polymer-based oil displacing agents. For example, ultra-high molecular weight polyacrylamide, with 0.05% aqueous solution, can penetrate into the crevices of oil reservoirs and produce 20% to 30% more oil, roughly 10 barrels (1590L) of crude oil can be produced for every 1kg of oil displacement agent. The staged oil displacement of polymer solution and surfactant (microemulsion of petroleum sulfonate and alcohol) developed in recent years can displace the crude oil in the rock capillary, and the effect is almost 100%. [0003] Quaternary oil displacement agent is a commonly used polymer oil displacement agent, AA (acrylic acid) / AM (acrylam...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F285/00C08F220/06C08F220/56C08F220/58C08F251/00C08F222/06C09K8/588
Inventor 何毅徐中浩施太和吴凤张春丽
Owner SOUTHWEST PETROLEUM UNIV
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