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Core-shell type polymer microsphere and preparation method thereof

A polymer, core-shell technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of poor plugging effect, poor temperature resistance and salt resistance, instability, etc.

Pending Publication Date: 2019-04-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the technical problems to be solved by the present invention is the problems existing in the prior art that the polymer microemulsion is unstable, the polymer microspheres have poor heat and salt resistance, and the plugging effect is poor after long-term aging. Polyacrylamide microspheres, the polymer microemulsion of the present invention has the characteristics of stability, and the polymer microspheres in the polymer microemulsion have the advantages of good temperature resistance and salt resistance, and good plugging effect after long-term aging

Method used

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  • Core-shell type polymer microsphere and preparation method thereof

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Embodiment 1

[0039] The polymer microspheres of this embodiment are prepared by polymerizing a reverse-phase microemulsion under the action of a redox composite initiator; the reverse-phase microemulsion, in parts by weight, comprises the following components:

[0040] a) 50 parts of oil-soluble solvent; oil-soluble solvent is white oil;

[0041] b) 10 parts of emulsifier; the emulsifier HLB value is 6.7 (from Span 60 (ie sorbitan monostearate) HLB value 4.7; Tween 20 (polyoxyethylene (20EO) sorbitan monolauric acid Esters) mixed with HLB value 16.7);

[0042] c) 35 parts of hydrophilic monomers: 18 parts of acrylamide, 6 parts of sodium acrylate, 6 parts of 2-acrylamido-2-sodium methylpropanesulfonate and 5 parts of dimethyl diallyl ammonium chloride composition;

[0043] d) 5 parts of hydrophobic monomers: sodium 2-acrylamido-N-hexadecylsulfonate;

[0044] e) 30 parts of water;

[0045] Wherein, the composite initiator, in terms of the above-mentioned total monomer weight percent, co...

Embodiment 2

[0081] The polymer microspheres of this embodiment are prepared by polymerizing a reverse-phase microemulsion under the action of a redox composite initiator; the reverse-phase microemulsion, in parts by weight, comprises the following components:

[0082] a) 50 parts of oil-soluble solvent; oil-soluble solvent is white oil;

[0083] b) 10 parts of emulsifier; the emulsifier HLB value is 6.7 (from Span 60 (ie sorbitan monostearate) HLB value 4.7; Tween 20 (polyoxyethylene (20EO) sorbitan monolauric acid Esters) mixed with HLB value 16.7);

[0084] c) 35 parts of hydrophilic monomers: 18 parts of acrylamide, 6 parts of sodium acrylate, 6 parts of 2-acrylamido-2-sodium methylpropanesulfonate and 5 parts of dimethyl diallyl ammonium chloride composition;

[0085] d) 5 parts of hydrophobic monomers: octadecyl methacrylate;

[0086] e) 30 parts of water;

[0087] Wherein, the composite initiator, in terms of the above-mentioned total monomer weight percent, comprises the follow...

Embodiment 3

[0101] The polymer microspheres of this embodiment are prepared by polymerizing a reverse-phase microemulsion under the action of a redox composite initiator; the reverse-phase microemulsion, in parts by weight, comprises the following components:

[0102] a) 50 parts of oil-soluble solvent; oil-soluble solvent is white oil;

[0103] b) 10 parts of emulsifier; the emulsifier HLB value is 6.7 (from Span 60 (ie sorbitan monostearate) HLB value 4.7; Tween 20 (polyoxyethylene (20EO) sorbitan monolauric acid Esters) mixed with HLB value 16.7);

[0104] c) 35 parts of hydrophilic monomers: 18 parts of acrylamide, 6 parts of sodium acrylate, 6 parts of 2-acrylamido-2-sodium methylpropanesulfonate and 5 parts of dimethyl diallyl ammonium chloride composition;

[0105] d) 5 parts of hydrophobic monomers: p-tert-butylstyrene;

[0106] e) 30 parts of water;

[0107] Wherein, the composite initiator, in terms of the above-mentioned total monomer weight percent, comprises the following...

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Abstract

The invention relates to a core-shell type polymer microsphere and a preparation method thereof. In the prior art, the polymer microemulsion is unstable, the polymer microsphere has poor temperature resistance and poor salt resistance, and the sealing effect is poor after long-term aging. A purpose of the present invention is mainly to solve the problems in the prior art. According to the technical scheme, the core-shell type polymer microsphere is prepared by carrying out a polymerization reaction on a reverse phase microemulsion under the action of a redox composite initiator; the reverse phase microemulsion comprises, by weight, 50 parts of an oil-soluble solvent, 3-20 parts of an emulsifier, 10-60 parts of a hydrophilic monomer, 0.5-10 parts of a hydrophobic monomer, and 10-50 parts ofwater; and through a two-step reaction method, a water phase solution containing acrylamide, other hydrophilic monomers and hydrophobic monomers is added to an oil phase containing an emulsifier in steps, and a polymerization reaction is performed. With the technical scheme, the problems in the prior art are well solved. The core-shell type polymer microsphere of the present invention can be usedfor the tertiary oil recovery of high temperature and high salinity oil reservoir.

Description

technical field [0001] The invention relates to a core-shell polymer microsphere and a preparation method thereof. Background technique [0002] After primary and secondary oil recovery in major domestic oil fields, the water content of crude oil continues to increase, and some large oil fields have entered the stage of tertiary oil recovery. Polymer flooding is the main technical method of tertiary oil recovery. The oil flooding mechanism is clear, the process is relatively simple, and the technology is becoming more and more mature. It is an effective technical measure for enhancing oil recovery. However, for heterogeneous formations, the displacement can only act on the high-permeability layer, not the oil-bearing low-permeability layer, which reduces the recovery rate of crude oil and increases the cost. Generally, for heterogeneous formations, water injection well profile control and production well water plugging technology are often used, but the effective range of t...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/06C08F220/58C08F226/02C08F222/38C08F220/18C08F212/12C08F222/40C08F222/06C08F220/34C08F2/32C08F4/40C09K8/588
CPCC09K8/588C08F2/32C08F4/40C08F220/56C08F220/06C08F220/585C08F226/02C08F220/1818C08F222/385C08F222/40C08F220/34C08F222/06C08F212/12
Inventor 宋晓芳夏燕敏苏智青
Owner CHINA PETROLEUM & CHEM CORP
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