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Amphiphilic modified chitosan degradable oil displacement agent and preparation method thereof

A technology of chitosan and oil displacing agent, which is applied in the field of amphiphilic molecular chain hybrid chitosan degradable polymer and its preparation, which can solve the problems of poor water solubility of chitosan, low monomer conversion rate, and high economic cost , to achieve the effects of increased temperature and salt resistance and long-term stability, enhanced oil recovery, and reliable principles

Active Publication Date: 2015-08-19
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, chitosan-based biopolymer oil displacement agents are rarely reported. The fundamental reasons are as follows: ① chitosan has poor water solubility and is difficult to modify; ② amphiphilic modification of chitosan requires a large amount of emulsifier , high economic cost, low purity, and cumbersome purification process in the later stage; ③The conversion rate of monomers is low, resulting in low molecular weight of biopolymers, which cannot meet the thickening standards of polymers for oil displacement

Method used

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  • Amphiphilic modified chitosan degradable oil displacement agent and preparation method thereof
  • Amphiphilic modified chitosan degradable oil displacement agent and preparation method thereof
  • Amphiphilic modified chitosan degradable oil displacement agent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035]Add 2.0gAA and a certain amount of distilled water into the reactor, slowly add 2.5g CS under stirring condition, until the solution system is homogeneous yellow, add 5.0gAM, 0.15g NaAMC m The distilled aqueous solution of S (m=9), adjusted to pH=6.5 with ammonia water, is prepared into a solution with a total monomer mass concentration of 22.5%, and passes through N 2 30min, then add initiator AIBA 0.010g, seal, and react at 55°C for 4h to obtain a polymer hydrogel; the polymer hydrogel (the polymer used for characterization is first washed three times with absolute ethanol) is shredded and passed through drying, pulverizing and sieving to obtain amphiphilic modified chitosan polymer dry powder.

Embodiment 2

[0037] Add 2.5gAA and a certain amount of distilled water into the reactor, slowly add 3.0g CS under stirring condition, until the solution system is homogeneous yellow, add 5.0gAM, 0.175g NaAMC m The distilled aqueous solution of S (m=11), adjusted to pH=5.5 with ammonia water, is prepared into a solution with a total monomer mass concentration of 18%, and passes through N 2 30min, then add the initiator AIBA 0.012g, seal, and react at 60°C for 6h to obtain the polymer hydrogel; after the polymer hydrogel is cut into pieces, it is dried, crushed and sieved to obtain the amphiphilic modified shell Polysaccharide polymer dry powder.

Embodiment 3

[0039] Add 2.0gAA and a certain amount of distilled water into the reactor, slowly add 2.0g CS under stirring condition, until the solution system is homogeneous yellow, add 5.2gAM, 0.125g NaAMC m The distilled aqueous solution of S (m=13), adjusted to pH=5.0 with ammonia water, is prepared into a solution with a total monomer mass concentration of 25%, and passes through N 2 30min, then add 0.012g of initiator AIBA, seal, and react at 55°C for 4h to obtain a polymer hydrogel; after the polymer hydrogel is cut into pieces, it is dried, pulverized, and sieved to obtain an amphiphilic modified shell Polysaccharide polymer dry powder.

[0040] Two, the structural characterization of the amphiphilic modified chitosan degradable oil-displacing agent (taking the polymer oil-displacing agent prepared in Example 1 as an example)

[0041] (1) Infrared Spectrum

[0042] Infrared spectrum of amphiphilic modified chitosan degradable oil displacement agent such as figure 1 Shown, analyz...

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Abstract

The invention discloses an amphiphilic modified chitosan degradable oil displacement agent and its preparation method. According to the preparation method of the oil displacement agent, copolymerization of chitosan used as a macromonomer, acrylamide and acrylic acid used as water-soluble monomers and 2-alkyl acrylamide alkyl sodium sulfonate used as a hydrophobic monomer is carried out with 2,2'-azobis[2-methylpropionamidine] dihydrochloride used as an initiator under the emulsifier-free condition, so as to form a worm-shaped polymer. The preparation method has reliable principle and is simple to operate. The prepared biopolymer shows excellent oil displacement properties such as viscosifying capability, high shearing resistance, heat resistance and salt tolerance and the like, has biocompatibility and degradability, and can be used as a green oil displacement agent in oil fields of medium-high temperature, medium-high salinity and high water content so as to enhance oil recovery.

Description

technical field [0001] The invention relates to an amphiphilic molecular chain hybrid chitosan degradable polymer and a preparation method thereof, belonging to the fields of new materials and oil field chemistry. Background technique [0002] As a non-renewable strategic resource, oil is related to the national economy and people's livelihood. After years of water injection development in my country's main oilfields and offshore Bohai Bay, they have entered a high water-cut stage of development, with high recoverable reserves and high water content of produced fluids, and are in the "double high" stage as a whole. At the same time, due to the long-term scouring of the injected water, the horizontal and vertical contradictions of the reservoir are prominent, water channeling is serious, and it is difficult to stabilize production. Therefore, it is imminent to improve the water injection development effect of high water-cut reservoirs and achieve the goal of increasing oil p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/588C08F251/00C08F220/06C08F220/56C08F220/58
CPCC08F220/585C08F251/00C09K8/588C08F220/06C08F220/56C08F220/58
Inventor 蒲万芬刘锐孙琳闫召鹏尚晓培赵磊
Owner SOUTHWEST PETROLEUM UNIV
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