PH-SENSITIVE TEMPORARY PLUGGING AGENT, PREPARATION METHOD THEREOF, AND USE THEREOF IN EXPLOITATION OF LOW-PERMEABILITY OIL RESERVOIR

PH-SENSITIVE TEMPORARY PLUGGING AGENT, PREPARATION METHOD THEREOF, AND USE THEREOF IN EXPLOITATION OF LOW-PERMEABILITY OIL RESERVOIR

A pH-sensitive temporary plugging agent and its preparation method, and the use thereof in exploitation of a low-permeability oil reservoir are disclosed. The temporary plugging agent is prepared by raw materials including, in percentages by mass, 3-8% of carboxymethyl chitosan, 0.2-0.7% of gelatin,...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: Wang, Kailu, Zhang, Beibei, Li, Yang, Jiang, Zhuyang, Yu, Xiaorong, Xiao, Chang, Yang, Huan, Su, Gaoshen
Format: Patent
Sprache:eng
Schlagworte:
ADHESIVES
CHEMISTRY
DYES
MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE
METALLURGY
MISCELLANEOUS APPLICATIONS OF MATERIALS
MISCELLANEOUS COMPOSITIONS
NATURAL RESINS
PAINTS
POLISHES
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Beschreibung
Zusammenfassung:A pH-sensitive temporary plugging agent and its preparation method, and the use thereof in exploitation of a low-permeability oil reservoir are disclosed. The temporary plugging agent is prepared by raw materials including, in percentages by mass, 3-8% of carboxymethyl chitosan, 0.2-0.7% of gelatin, 0.1-0.6% of an initiator, 5-15% of a toughener, and a balance of water, wherein the initiator is a solution of AgNO3 in ammonia water having a concentration of 0.1-0.3 mol/L, and the toughener is a carboxyl-terminated hyperbranched polyester.