Temperature-resistant and salt-resistant polymer containing cyclic structure as well as preparation method and application of temperature-resistant and salt-resistant polymer

A ring-shaped, temperature-resistant and salt-resistant technology, applied in the fields of oil exploration and tertiary oil recovery polymer flooding, can solve the problems of precipitation, reduction of oil-water mobility ratio, loss of oil displacement capacity, etc.

Pending Publication Date: 2022-05-13
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Among them, the main function of the polymer is to increase the viscosity of the injected aqueous solution, reduce the oil-water mobility ratio, and reduce the "fingering" cross-flow phenomenon of water in the reservoir due to heterogeneity. The main component of the polymer is polypropylene Amide, the high molecular weight polyacrylamide used for ordinary oil displacement, due to the salt-sensitive effect, under the condition of high salt concentration, the molecular chain curls up under the compression of salt ions, the hydrodynamic volume is greatly reduced, and the macroscopic performance is apparent viscosity Significantly lower, it is difficult to meet the viscosity requirements for oil displacement polyacrylamide
Moreover, under the conditions of acid, alkali, high calcium and magnesium concentration or temperature exceeding 80°C, accelerated hydrolysis reaction will occur, resulting in the degradation of polyacrylamide and even precipitation. The viscosity is almost zero and the oil displacement ability is lost.

Method used

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  • Temperature-resistant and salt-resistant polymer containing cyclic structure as well as preparation method and application of temperature-resistant and salt-resistant polymer
  • Temperature-resistant and salt-resistant polymer containing cyclic structure as well as preparation method and application of temperature-resistant and salt-resistant polymer
  • Temperature-resistant and salt-resistant polymer containing cyclic structure as well as preparation method and application of temperature-resistant and salt-resistant polymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] This embodiment provides a temperature-resistant and salt-resistant polymer containing a ring structure, which is prepared by the following steps:

[0063] First add 725g of distilled water to a 1L jar, add 200g of acrylamide monomer AM, then add 50g of acrylic acid monomer AA, mix well, turn the stirring speed to 1000 rpm, mix well, dissolve completely, and then oxidize with hydrogen Adjust the pH of the aqueous solution to 7.0±0.5 with sodium, then add 8g of sodium p-styrenesulfonate under stirring conditions, then add 6g of acryloylmorpholine, and then cool down to 15°C; Deoxygenation with high-purity nitrogen above % for 10 minutes, adding 1.5 g of polymerization catalyst 3-aminopropionitrile, continuing nitrogen deoxygenation for 20 minutes, adding 1.2 g of azobisisoheptanonitrile, and nitrogen deoxygenation for 20 minutes, then adding ammonium persulfate 0.008g, and then add 0.02g of sodium bisulfite after 2 minutes, then continue to pass nitrogen until the soluti...

Embodiment 2

[0066] This embodiment provides a temperature-resistant and salt-resistant polymer containing a ring structure, which is prepared by the following steps:

[0067] Add 722g of distilled water to a 1L jar, add 240g of acrylamide monomer AM, then add 50g of acrylic acid monomer AA, mix evenly, turn the stirring speed to 1000 rpm, mix evenly, dissolve completely, and then oxidize with hydrogen Adjust the pH of the aqueous solution to 7.0±0.5 with sodium, then add 10g of sodium p-styrenesulfonate under stirring conditions, then add 7g of acryloylmorpholine, and then cool down to 18°C; Deoxygenation with high-purity nitrogen above % for 10 minutes, adding 1.8 g of polymerization catalyst 3-aminopropionitrile, continuing nitrogen deoxygenation for 20 minutes, adding 2.4 g of azobisisoheptanonitrile, and nitrogen deoxygenation for 20 minutes, then adding ammonium persulfate 0.008g, and then add 0.02g of sodium bisulfite after 2 minutes, then continue to pass nitrogen until the solutio...

Embodiment 3

[0070] This embodiment provides a temperature-resistant and salt-resistant polymer containing a ring structure, which is prepared by the following steps:

[0071] First add 721g of distilled water to a 1L jar, add 220g of acrylamide monomer AM, then add 35g of acrylic acid monomer AA, mix well, turn the stirring speed to 1000 rpm, mix well, dissolve completely, and then use sodium hydroxide Adjust the pH of the aqueous solution to 7.0±0.5, then add 8g of sodium p-styrenesulfonate under stirring conditions, then add 6g of acryloylmorpholine, and then cool down to 20°C; The above high-purity nitrogen was deoxygenated for 10 minutes, and 3.6 g of the polymerization catalyst 3-aminopropionitrile was added, and 1.8 g of azobisisoheptanonitrile was added after continuing nitrogen deoxygenation for 20 minutes, and ammonium persulfate 0.010 was added after nitrogen deoxygenation for 20 minutes. g, 0.03 g of sodium bisulfite was added after 2 min, and then nitrogen gas was continued un...

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Abstract

The invention provides a temperature-resistant and salt-resistant polymer containing a cyclic structure as well as a preparation method and application of the temperature-resistant and salt-resistant polymer. The polymer is represented by the following formula (III). According to the invention, a functional monomer containing a molecular ring structure, such as a benzene ring and a heterocyclic ring, is used as a steric hindrance group, so that the salt ion compression resistance of a polymer molecular chain is improved, the polymer molecular chain is not easy to curl, the molecular chain is more extensive, the hydrodynamic volume is larger, the salt-resistant tackifying effect is better, and meanwhile, the proper molecular weight (1 million to 5 million) is ensured; and good injectivity in a low-permeability oil layer is ensured.

Description

technical field [0001] The present invention relates to the field of petroleum exploitation, specifically, the present invention relates to the field of tertiary oil recovery polymer flooding in the process of petroleum exploitation, more specifically, the present invention relates to a kind of heat-resistant and salt-resistant polymer containing ring structure and its preparation The method and application, especially relate to the polymer used for oil production under the conditions of low permeability, sewage injection technology and high temperature and high salinity reservoir conditions. Background technique [0002] Polymer flooding is the most widely used technique in tertiary oil recovery technology. Polymer flooding mainly increases the viscosity of the water phase through high-molecular water-soluble polymers, thereby improving the oil-water mobility ratio, increasing the flow resistance of the dominant water flow channel, reducing the permeability of the dominant ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/06C08F212/14C08F220/58C09K8/588
CPCC08F220/56C09K8/588C08F220/06C08F212/14C08F220/585
Inventor 朱卓岩王凤王源源刘存辉张付生刘国良李雪凝
Owner PETROCHINA CO LTD
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