Title:
MICRO-NANO SPHERICAL MODIFIED SILICON DIOXIDE ACID GELLING AGENT, PREPARATION METHOD THEREFOR, AND USE THEREOF
Document Type and Number:
WIPO Patent Application WO/2024/007759
Kind Code:
A1
Abstract:
Provided in the present invention are a micro-nano spherical modified silicon dioxide acid gelling agent, a preparation method therefor, and the use thereof. The preparation method for the micro-nano spherical modified silicon dioxide acid gelling agent comprises: nano SiO2 and a silane coupling agent undergoing a contact reaction to obtain surface-modified nano SiO2; the surface-modified nano SiO2 and acrylic acid undergoing a contact reaction to obtain a macromolecular initiator; and in the presence of an oxidizing agent and a reducing agent, the macromolecular initiator undergoing a contact reaction with a vinyl sulfonate, a vinyl quaternary ammonium salt and N-vinylpyrrolidone to obtain the micro-nano spherical modified silicon dioxide acid gelling agent. The micro-nano spherical modified silicon dioxide acid gelling agent of the present invention is prepared by means of the method. Also provided in the present invention is the use of the acid gelling agent in acid fracturing. The acid gelling agent of the present invention can achieve resistance to a temperature of 180 ℃ or above and can prop an oil-gas channel in a specific stratum, thereby increasing the recovery rate.
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Inventors:
LIU YUNFENG (CN)
LIU YUZHOU (CN)
MA CHENTAO (CN)
TANG YONGFAN (CN)
ZHANG YAN (CN)
ZHANG QIAN (CN)
LIU YUZHOU (CN)
MA CHENTAO (CN)
TANG YONGFAN (CN)
ZHANG YAN (CN)
ZHANG QIAN (CN)
Application Number:
PCT/CN2023/096216
Publication Date:
January 11, 2024
Filing Date:
May 25, 2023
Export Citation:
Assignee:
PETROCHINA CO LTD (CN)
International Classes:
C09K8/72; C08F226/02; C08F226/10; C08F228/02
Foreign References:
| CN106832113A | 2017-06-13 | |||
| CN113912769A | 2022-01-11 | |||
| US20170158951A1 | 2017-06-08 |
Attorney, Agent or Firm:
BEIJING SANYOU INTELLECTUAL PROPERTY AGENCY LTD. (CN)
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