Polyacrylamide microsphere system and preparation method and application thereof

A technology of polyacrylamide microspheres and polyacrylamide, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as insufficient stability of emulsions, and achieve improved expansion modulus and shear modulus, Effect of improving stability and reducing dosage

Active Publication Date: 2020-02-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The main purpose of the present invention is to overcome the problem of insufficient stability of the emulsion formed by the existing emulsion surfactant flooding technology, and to provide a polyacrylamide microsphere system that can be used for emulsion interface strengthening and its preparation method

Method used

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  • Polyacrylamide microsphere system and preparation method and application thereof
  • Polyacrylamide microsphere system and preparation method and application thereof
  • Polyacrylamide microsphere system and preparation method and application thereof

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preparation example Construction

[0053] The second object of the present invention is to provide a method for preparing the polyacrylamide microsphere system described above, the method comprising the following steps:

[0054] Preparation of water phase: Dissolve polymerized monomers, organic salts, cross-linking agents, and polymerization aids in deionized water according to the mass fraction, stir fully until completely dissolved, adjust the pH value to 8-12, mix well and place in a constant temperature water bath Stabilize to the required temperature for polymerization, ready for use;

[0055] Preparation of the initiator solution: dissolve the oxidizing agent and the reducing agent in deionized water according to a certain mass fraction; dissolve the azo compound in 1% to 10% non-polar solvent for emulsification; preferably, the oxidizing agent and the reducing agent in the initiator The ratio of reducing agent is 0.5~2:1;

[0056] Preparation of oil phase: Dissolve emulsifier and co-emulsifier in non-po...

Embodiment 1

[0066] The preparation method of the polyacrylamide microsphere system comprises the following steps:

[0067] (1) Preparation of the aqueous phase:

[0068] Add 270g of deionized water to the container, add 150g of polymerized monomer acrylamide, 37.5g of 2-acrylamido 2-methylpropanesulfonic acid, and use a cantilever stirrer at 400rpm under the protection of nitrogen at a pressure of 0.3MPa. Continue to stir at high speed until completely dissolved. Continue to add 3g of sodium citrate, 0.12ml of N,N-methylenebisacrylamide aqueous solution with a concentration of 0.5g / 100mL, 0.06g of azobisisobutylamidine dihydrochloride, 0.4g of urea, 0.2g of DTPA, 0.6mL of sodium bisulfite aqueous solution with a concentration of 0.5g / 100mL, stir well until completely dissolved, use sodium hydroxide to adjust the pH value of the solution to 9.0, continue to add deionized water to replenish the system quality to 600g, and transfer to a 45°C water bath Set aside.

[0069] (2) Preparation ...

Embodiment 2

[0086] The preparation method of the polyacrylamide microsphere system comprises the following steps:

[0087] (1) Preparation of the aqueous phase:

[0088]Add 270g of deionized water into the container, add polymerized monomers (150g of acrylamide, 37.5g of acrylic acid) into the container, and use a cantilever stirrer under the protection of nitrogen at a pressure of 0.3MPa at a speed of 400rpm to continue stirring until completely dissolved. Continue to add 3.5g of sodium citrate, 0.12ml of N,N-methylenebisacrylamide aqueous solution with a concentration of 0.5g / 100mL, 0.06g of azobisisobutylamidine dihydrochloride, 0.4g of urea, 0.2g EDTA, 0.6mL sodium bisulfite aqueous solution with a concentration of 0.5g / 100mL, stir well until completely dissolved, adjust the pH value of the solution to 9.0 with sodium hydroxide, continue to add deionized water to supplement the system quality to 600g, transfer to 55 ℃ water bath for use.

[0089] (2) Preparation of oil phase:

[00...

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Abstract

The invention relates to a microemulsion system and a preparation method thereof, in particular to a polyacrylamide microsphere system and a preparation method and application thereof. The microspheresystem is prepared through an emulsion polymerization reaction under the action of a composite initiator. The emulsion system comprises the following components in percentage by mass: 10%-60% of a monomer, 0.1%-3% of an organic salt, 3%-20% of an emulsifier, 0.01%-2% of a co-emulsifier, 0.01%-1% of a cross-linking agent, 0.001%-0.5% of an initiator, 0.001%-1% of a polymerization auxiliary agent,10%-70% of deionized water and 10%-50% of a non-polar solvent. The polymer microsphere system is used as an interface enhancer for emulsion flooding, can effectively improve the expansion modulus andshear modulus of an emulsion interface, and enhances emulsion stability; and after compounding polymer microspheres and a surfactant, a very good fluidity control effect is obtained and the profile control and flooding capacity of emulsion flooding is improved.

Description

technical field [0001] The invention relates to a microemulsion system and a preparation method, in particular to a polyacrylamide microsphere system, a preparation method and application thereof. Background technique [0002] Emulsion surfactant flooding is a brand-new oil displacement technology. This oil displacement method can endow the oil displacement system with temperature resistance, salt resistance, emulsification viscosity increase, High-efficiency oil displacement, easy injection, etc., but in the case of relatively high permeability, the strength of the interface film of the emulsion produced by surfactant flooding is not enough, so the emulsion is prone to coalescence and demulsification during the flooding process, resulting in The range of enhanced oil recovery is reduced. Therefore, the research and development of emulsion interface strengthening agents has received more and more attention. [0003] Chinese invention patent (CN107129585A) discloses a metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/58C08F222/38C08F220/06C08F220/34C08F220/54C08F212/14C09K8/584
CPCC08F212/14C08F220/34C08F220/56C09K8/584C09K8/887C08F220/06C08F222/385C08F220/54
Inventor 季岩峰曹绪龙郭兰磊祝仰文马宝东窦立霞周敏李宗阳孙秀芝李彬
Owner CHINA PETROLEUM & CHEM CORP
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