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Polymer system in controllable association strength

A technology of polymer and cyclodextrin polymer, which is applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of changing molecular configuration, uncontrollable system viscosity, increasing design and synthesis costs, etc.

Inactive Publication Date: 2017-10-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Hydrophobic association polymers used in oilfield flooding in the prior art, once prepared, the association strength of the polymer hydrophobic groups cannot be controlled, and the hydrodynamic radius of the aggregates formed at a certain concentration remains unchanged, and the viscosity of the system remains unchanged. It cannot be adjusted, and the molecular configuration cannot be changed according to different geological conditions, thus increasing the cost of design and synthesis

Method used

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  • Polymer system in controllable association strength
  • Polymer system in controllable association strength
  • Polymer system in controllable association strength

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1 Application of the polymer system with controllable association strength

[0019] The steps are as follows: add 0.15g linear cyclodextrin polymer to 100mL water, fully dissolve at 50°C, use a viscometer at a shear rate of 7.34s - The maximum viscosity under the condition is 180mPa·s. Add 0.002g, 0.003g and 0.004g of adamantane-12 alkyl sodium sulfate slowly, stir and dissolve, and measure the viscosity of the system under the same conditions as 210mPa·s, 280mPa·s and 320mPa·s respectively.

[0020] The linear cyclodextrin polymer has a molecular weight of 12 million and a degree of hydrolysis of 25%. It is prepared by the following method: allyl-β-cyclodextrin, acrylamide and sodium acrylate are polymerized to obtain a linear cyclodextrin Dextrin polymer, wherein, the molar ratio of allyl-β-cyclodextrin, acrylamide and sodium acrylate is 5:70:25, and the reaction conditions are: the total concentration is 25wt%; the reaction temperature is 30°C; Ammonium per...

Embodiment 2

[0021] Example 2 Application of the polymer system with controllable association strength

[0022] The steps are as follows: 0.20g modified Nano-SiO 2 Add the star-shaped polymer cyclodextrin polymer into 100mL water, fully dissolve at 60°C, use a viscometer at a shear rate of 7.34s - The maximum viscosity under the condition is 150mPa·s. Add 0.002g, 0.003g and 0.004g of adamantane-12 alkyl sodium sulfate slowly, stir and dissolve, and measure the viscosity of the system under the same conditions as 180mPa·s, 220mPa·s and 260mPa·s respectively.

[0023] The modified Nano-SiO 2 Star polymer cyclodextrin polymer, made of Nano-SiO 2 After surface silane coupling to form modified nanoparticles containing olefins on the surface, it is formed by free radical polymerization with allyl-β-cyclodextrin, acrylamide and sodium acrylate, with a molecular weight of 8 million and a degree of hydrolysis of 25%. The preparation method is as follows: First, the Nano-SiO 2 The surface is si...

Embodiment 3

[0024] Example 3 Application of the polymer system with controllable association strength

[0025] The steps are as follows: add 0.15g linear cyclodextrin polymer to 100mL water, fully dissolve at 50°C, use a viscometer at a shear rate of 7.34s - The maximum viscosity under the condition is 200mPa·s. Slowly add 0.002g, 0.003g and 0.004g of benzyl-12 alkyl sodium sulfate respectively, stir and dissolve, and measure the viscosity of the system under the same conditions as 240mPa·s, 300mPa·s and 330mPa·s respectively.

[0026] The preparation method of the linear cyclodextrin polymer is the same as in Example 1.

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Abstract

The invention discloses a polymer system in controllable association strength. The polymer system comprises a subject cyclodextrin polymer and an object surfactant; the subject cyclodextrin polymer is selected from linear cyclodextrin polymer and modified Nano-SiO2 star-shaped macromolecule cyclodextrin polymer; the object surfactant is selected from adamantine-sodium octadecyl sulfate, adamantine-lauryl sodium sulfate, adamantine-cetyl sodium sulfate, benzyl-sodium octadecyl sulfate, benzyl-lauryl sodium sulfate and benzyl-cetyl sodium sulfate. In an application, the cyclodextrin polymer is prepared into an aqueous solution in the concentration of 0.1-0.5g / ml and then is mixed with the surfactant, the cyclodextrin advantage is utilized to wrap adamantine or benzene ring while the alkyl hydrophobic chain is exposed on the exterior of the cyclodextrin hydrophobic chamber, so that the polymer system in controllable association strength can be realized, the system viscosity is changed and the purpose of dynamically regulating the system viscosity can be achieved.

Description

technical field [0001] The invention relates to a polymer system with controllable association strength. The viscosity of the system can be dynamically adjusted, and is suitable for the development of the polymer system for oil field displacement. Background technique [0002] Hydrophobic associating polymers refer to high molecular polymers in which both hydrophilic and lipophilic groups appear in the molecule and have water-soluble properties. The existence of a small amount of hydrophobic groups makes the hydrophobic association polymer have a critical aggregation concentration (CAC) in aqueous solution. When the polymer concentration in the aqueous solution is higher than the CAC, the hydrophobic groups undergo intermolecular association to form an aggregate structure, the hydrodynamic volume of the polymer solution increases, and the solution has a higher viscosity. Hydrophobic association polymers used in oil field flooding in the prior art, once prepared, the associa...

Claims

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Application Information

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IPC IPC(8): C08F251/00C08F220/06C08F220/56C08K9/06C08K3/36C08J3/09C09K8/584C09K8/588
CPCC08F251/00C08J3/097C08J2351/02C08K3/36C08K9/06C08K2201/011C09K8/584C09K8/588C08F220/06C08F220/56
Inventor 曹绪龙杨勇季岩峰宋新旺郭兰磊祝仰文姜祖明
Owner CHINA PETROLEUM & CHEM CORP
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