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Cross-linked polymer microsphere for oil displacement of oilfield and preparation method for cross-linked polymer microsphere

A technology of cross-linked polymers and microspheres, applied in drilling compositions, chemical instruments and methods, etc., can solve problems such as cost increase, achieve good injectability, improve recovery rate, and expand the swept volume of water flooding. Effect

Active Publication Date: 2012-07-25
固安国勘石油技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, there are reports of using polyacrylamide nano-microspheres as a control agent, but the preparation of polyacrylamide-based nano-microspheres by inverse microemulsion polymerization requires the use of a large amount of emulsifier, which generally accounts for more than 10% of the total mass of the system. Adding a large amount of emulsifier makes the cost significantly increased

Method used

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  • Cross-linked polymer microsphere for oil displacement of oilfield and preparation method for cross-linked polymer microsphere
  • Cross-linked polymer microsphere for oil displacement of oilfield and preparation method for cross-linked polymer microsphere
  • Cross-linked polymer microsphere for oil displacement of oilfield and preparation method for cross-linked polymer microsphere

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Experimental program
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Effect test

Embodiment 1

[0056] (1) Preparation of monomer solution: Dissolve acrylamide which accounts for 30% of the reaction system in deionized water which accounts for 32% of the reaction system. After stirring to dissolve it, add CH which accounts for 2.0% of the reaction system. 3 CH=CH-C(C 2 H 4 OC 2 H 5 ) 3 , Then add 0.5% of the reaction system of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), after it is completely dissolved, fully stir until the solution is clear and free of solid insolubles, and adjust the solution to pH with 1% NaOH aqueous solution =7.0.

[0057] (2) Preparation of inverse emulsion system: Dissolve 5% of the surface active agent in the reaction system (Span-80: Tween-60, mass ratio 2:1) into 30% of the kerosene in the reaction system, and dissolve it fully. After homogenization, the monomer aqueous solution of step (1) is slowly added and fully stirred to obtain an opaque reverse emulsion polymerization reaction system.

[0058] (3) Thermal polymerization reaction: add 0....

Embodiment 2

[0060] (1) Preparation of monomer solution: Dissolve 25% of the acrylamide in the reaction system into deionized water that accounts for 25% of the reaction system, stir to dissolve it, and then add 5% of the reaction system CH 3 CH=CH-C(C 2 H 4 OCOCH 3 ) 3 , Then add 2% of the reaction system N,N'-methylenebisacrylamide, after completely dissolved, fully stir until the solution is clear and free of solid insolubles, adjust the solution to pH=7.0.

[0061] (2) Preparation of inverse emulsion system: Dissolve 1% of the surface active agent of the reaction system (Span-80: Tween-40 mass ratio 3:1) into the diesel oil that accounts for 40% of the reaction system, and wait to be fully dispersed and dissolved After homogenization, the monomer aqueous solution of step (1) is slowly added and fully stirred to obtain an opaque reverse emulsion polymerization reaction system.

[0062] (3) Thermal polymerization reaction: After dissolving 1% of the total mass of reaction monomers with azoisob...

Embodiment 3

[0064] (1) Preparation of monomer solution: Dissolve acrylamide which accounts for 28% of the reaction system in deionized water which accounts for 12.6% of the reaction system. After stirring to dissolve it, add CH which accounts for 0.1% of the reaction system. 3 CH=CH-C(C 2 H 4 OCOCH 3 ) 3 , Then add 4% of the reaction system N,N'-methylenebisacrylamide, after it is completely dissolved, fully stir until the solution is clear and free of solid insolubles, adjust the solution to pH=7.0.

[0065] (2) Preparation of inverse emulsion system: Dissolve 10% of the surfactant in the reaction system (Span-80: Tween-40 mass ratio 3:1) into the diesel oil that accounts for 45% of the reaction system, and dissolve it fully. After homogenization, the monomer aqueous solution of step (1) is slowly added and fully stirred to obtain an opaque inverse emulsion polymerization reaction system.

[0066] (3) Thermal polymerization reaction: After dissolving 0.1% of the total mass of reaction monomers...

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Abstract

The invention relates to cross-linked polymer microsphere for oil displacement of an oilfield and a preparation method for the cross-linked polymer microsphere. The cross-linked polymer microsphere is obtained by polymerization and cross-linking of the components including acrylamide monomers, dendritic functional monomers, cross-linking agent, emulsifier, dispersion media, initiator, deionized water and selectable initiator solvent. The microsphere has good heat stability and injectivity, can be applied to surfactant flooding of an oil reservoir at the temperature as high as 150 DEG C, and is applicable to the zone permeability range from 0.05 to 5000mD. The microsphere can be directly and quickly dispersed after entering a stratum and functions in intelligent blockage. The action mechanism includes that the cross-linked polymer microsphere absorbs water to swell in a water flow passage of a water zone to form a swelling cross-linked polymer aggregate with the grain size ranging from 0.1 to 10 micrometers, and single aggregate or multiple aggregates bridge to block a pore throat of the porous media water flow passage; but in an oil layer, the cross-linked polymer microsphere cannot swell and is difficult to block a flow passage, thereby having an intelligent function of blocking water but not blocking oil.

Description

Technical field [0001] The invention belongs to the field of oilfield profile control and flooding. More specifically, the present invention relates to a crosslinked polymer microsphere for oilfield profile control and flooding and a preparation method thereof. The cross-linked polymer microspheres have intelligent profile control and flooding, good thermal stability and injectability, and can be applied to surfactant flooding in oil reservoirs whose temperature reaches 150°C, and the applicable formation permeability range is 0.05-5000 mD. Background technique [0002] With the development of tertiary oil recovery, people’s understanding of thick reservoirs has deepened, and the use of profile control and displacement agents for deep treatment of reservoirs has become more and more in-depth, especially the widely used various underground cross-linking systems based on polyacrylamide. Its own shortcomings restrict its promotion and application. The main reason is that the gelati...

Claims

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Application Information

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IPC IPC(8): C08F220/54C08F220/56C08F216/20C08F222/14C08F2/32C09K8/588
Inventor 里群
Owner 固安国勘石油技术有限公司
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