The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 23, 2025
Filed:
Dec. 30, 2024
China University of Petroleum, Shandong, CN;
China Shi Da Education Development Co., Ltd, Shandong, CN;
Binglin Li, Shandong, CN;
Yuliang Su, Shandong, CN;
Binfei Li, Shandong, CN;
Chao Zhang, Shandong, CN;
Qichao Lv, Shandong, CN;
China University of Petroleum, Dongying, CN;
China shi da Education Development Co., Ltd, Qingdao, CN;
Abstract
A dual-purpose sacrificial anti-swelling agent, and a preparation method and application thereof are provided and relate to the technical field of oil reservoir exploitation. The dual-purpose sacrificial anti-swelling agent is quaternized lignin, a phenolic hydroxyl group of quaternized lignin is linked with two quaternary ammonium nitrogen atoms that are located at para positions of the same six-membered ring. Raw materials used in the present disclosure are prepared from papermaking waste liquid and a by-product of flue gas desulfurization and denitrification, which not only reduces the cost, but also transforms waste materials into valuable resources. The present disclosure increases the adsorption capacity of quaternized lignin in the formation by quaternizing lignin, and enables quaternized lignin to acts as both a sacrificial agent and an anti-swelling agent through competitive adsorption, achieving multiple purposes by using one agent.