Method for reducing viscosity of aqueous solution of hydrophobically associating polymer

A hydrophobic association and polymer technology, which is applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of long processing time and poor pertinence, and achieve strong pertinence of reaction, mild reaction conditions and viscosity reduction effect obvious effect

Active Publication Date: 2011-05-04
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to poor pertinence, the introduction of additional impurity components or long processing time, this kind of method affects its application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1, the viscosity reduction of hydrophobic association polymer aqueous solution

[0020] Take 90g AP-P4 aqueous solution, add 0.1g β-cyclodextrin, then the mass volume concentration of β-cyclodextrin in the system is 1000mg / L (total system volume is 0.1L), and carry out stirring reaction at 25°C. The viscosity of the system was measured when the reaction was carried out for 10min, 30min, 60min, 90min and 1d respectively, and the measured viscosity values ​​were 24.4mPa.s, 15.3mPa.s, 12.6mPa.s, 11.6mPa.s and 11.5mPa.s As can be seen from the above-mentioned viscosity value, when the reaction is carried out for 10min, the viscosity of the system has just declined to a large extent; it can be seen that the viscosity value when the comparison reaction is carried out for 90min and 1d, the system almost reaches the maximum viscosity reduction effect when the reaction is carried out to 90min, and the system The viscosity reduction rate reaches 98.2%.

Embodiment 2

[0021] Embodiment 2, the viscosity reduction of hydrophobic association polymer aqueous solution

[0022] Take 90g AP-P4 aqueous solution, add 0.08g β-cyclodextrin, then the mass volume concentration of β-cyclodextrin in the system is 800mg / L (total system volume is 0.1L), and carry out stirring reaction at 25°C. The viscosity of the system was measured when the reaction was carried out for 10min, 30min, 60min, 90min and 1d respectively, and the measured viscosity values ​​were 31.8mPa.s, 22.6mPa.s, 17.4mPa.s, 14.1mPa.s and 13.2mPa.s As can be seen from the above-mentioned viscosity value, when the reaction is carried out for 10min, the viscosity of the system has just declined to a large extent; it can be seen that the viscosity value when the comparison reaction is carried out for 90min and 1d, the system almost reaches the maximum viscosity reduction effect when the reaction is carried out to 90min, and the system The viscosity reduction rate reaches 97.8%.

Embodiment 3

[0023] Embodiment 3, the viscosity reduction of hydrophobic association polymer aqueous solution

[0024] Take 90g AP-P4 aqueous solution, add 0.06g β-cyclodextrin, then the mass volume concentration of β-cyclodextrin in the system is 600mg / L (total system volume is 0.1L), and carry out stirring reaction at 25°C. The viscosity of the system was measured when the reaction was carried out for 10min, 30min, 60min, 90min and 1d respectively, and the measured viscosity values ​​were 47.3mPa.s, 29.3mPa.s, 24.1mPa.s, 19.4mPa.s and 19.4mPa.s As can be seen from the above-mentioned viscosity value, when the reaction is carried out for 10min, the viscosity of the system has just declined to a large extent; it can be seen that the viscosity value when the comparison reaction is carried out for 90min and 1d, the system almost reaches the maximum viscosity reduction effect when the reaction is carried out to 90min, and the system The viscosity reduction rate reaches 97.0%.

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Abstract

The invention discloses a method for reducing the viscosity of aqueous solution of hydrophobically associating polymer by using cyclodextrin. The cyclodextrin can be alpa-cyclodextrin, beta-cyclodextrin or gamma-cyclodextrin. The supramolecular chemical method for reducing the viscosity of the aqueous solution of hydrophobically associating polymer is simple, convenient and quick, has high pertinence, is slightly influenced by environment, ensures that a byproduct is not generated, and is an effective method for reducing the viscosity of polymer solution.

Description

technical field [0001] The invention relates to a method for reducing the viscosity of a hydrophobic association polymer aqueous solution, belonging to the technical field of oilfield environmental protection. Background technique [0002] Hydrophobic association polymers are a new class of polymers that have emerged in recent years, that is, a small amount of hydrophobic groups are grafted on the main chain of water-soluble macromolecules. In aqueous solution, the hydrophobic groups of such polymers aggregate due to hydrophobic interactions, resulting in intramolecular and intermolecular associations of macromolecular chains. When the polymer concentration is higher than a certain critical concentration (critical association concentration), macromolecular chains aggregate through hydrophobic associations to form a supramolecular structure dominated by intermolecular associations——dynamic physical crosslinking network, hydrodynamics As the volume increases, the viscosity of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/00C08J3/21C08L33/26C08L5/16C09K8/588
Inventor 靖波张健
Owner CHINA NAT OFFSHORE OIL CORP
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