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Amphoteric ion composite microsphere as well as preparation method and application thereof

A technology of composite microspheres and zwitterions, which is applied in the direction of microsphere preparation, microcapsule preparation, chemical instruments and methods, etc., can solve the problems of limited use and achieve the effect of improving oil recovery

Active Publication Date: 2016-11-23
大庆市新万通科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the oilfields with rich reservoirs severely limit the use of commonly used profile control agents due to their high salinity and high temperature formation conditions.

Method used

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  • Amphoteric ion composite microsphere as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Mix 57kg of deionized water and 3.7kg of sodium hydroxide evenly, lower the temperature below 20°C, add 5kg of monomeric acrylic acid, 5kg of 2-acrylamido-2-methylpropanesulfonic acid, acryloyloxyethyltrimethyl Ammonium chloride 7kg, N-methylolacrylamide 2kg, the temperature is always kept below 20°C, then add 0.1kg of crosslinking agent methylene acrylamide, filler bentonite 20kg, mix well, add initiator potassium persulfate 0.1 kg, anhydrous sodium sulfite 0.1kg, stir well. Place the system at 45°C to solidify the system. After complete reaction, place it in an environment of 65°C for aging for 2 hours, the polymerization reaction is completed, and then dry and pulverize.

Embodiment 2

[0019] Mix 50kg of deionized water and 5.5kg of sodium carbonate evenly, lower the temperature below 20°C, add 2kg of monomer acrylamide, 8kg of acrylic acid, 5kg of methacryloyloxyethyltrimethylammonium chloride, N,N-di 4kg of methacrylamide, the temperature is always kept below 20°C, then add 0.2kg of cross-linking agent methylene acrylamide, 25kg of filler high territory, mix well, add 0.2kg of initiator ammonium persulfate, 0.1kg of anhydrous sodium sulfite , stir well. Place the system at 45°C to solidify the system. After complete reaction, place it in an environment of 65°C for aging for 2 hours, the polymerization reaction is completed, and then dry and pulverize.

Embodiment 3

[0021] Mix 50kg of deionized water and 3.5kg of sodium hydroxide evenly, lower the temperature below 20°C, add 4kg of monomer acrylamide, 10kg of 2-acrylamido-2-methylpropanesulfonic acid, acryloyloxyethyl trimethyl Ammonium chloride 3kg, N-hydroxyethylacrylamide 2kg, the temperature is always kept below 20 ℃, then add 0.2kg of allyl methacrylate cross-linking agent, heavy calcium filler 27kg, mix well, add the initiator over Ammonium sulfate 0.2kg, anhydrous sodium sulfite 0.1kg, stir well. Place the system at 45°C to solidify the system. After complete reaction, place it in an environment of 65°C for aging for 2 hours, the polymerization reaction is completed, and then dry and pulverize.

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Abstract

The invention relates to an amphoteric ion composite microsphere as well as a preparation method and application thereof. The amphoteric ion composite microsphere comprises the following components in parts by weight: 10-50 parts of a monomer, 0.05-1 part of a cross-linking agent, 0.2-10 parts of alkali, 0-40 parts of a filler, 0.05-1 part of an initiating agent and 40-70 part of deionized water. As a profile modification / water shutoff agent with high salinity resistance and high temperature stratum condition resistance for oil field profile modification, the amphoteric ion composite microsphere provided by the invention overcomes the defect of poor stability of an existing profile modification / water shutoff agent under a stratum environment with high temperature and high salinity and can be used for profile modification and water shutoff in an oil field with high temperature and high salinity, and the recovery ratio is improved.

Description

technical field [0001] The present invention relates to a zwitterionic composite microsphere and its preparation method and application, in particular to a zwitterionic composite microsphere capable of resisting high salinity and high temperature formation conditions and its preparation method for oilfield profile control and flooding And its application as a profile control and water shutoff agent in oilfield production. Background technique [0002] In the process of oilfield water injection development, due to the vertical and horizontal heterogeneity and viscosity difference of the oil layer, the injected water will protrude along the high permeability layer and flow around the low permeability layer, thus forming an area that the injected fluid cannot reach, and even appear In the dead oil zone, the water content of the oil well production fluid increases. It is necessary to use a profile control agent for profile control operations. [0003] At present, most domestic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/06C08F220/34C08F220/58C08F220/56C08F222/38C08F2/44C08K3/34C08K3/26B01J13/14C08J3/12C09K8/512
Inventor 吴凤祥
Owner 大庆市新万通科技开发有限公司
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