摘要
氰凝是一种聚氨酯类的化学灌浆材料。由于它与水反应速度快，在应用于油田堵水和封窜时施工较为困难。为此。
Urethane precondensate Qingning TPT is a chemical gelling material for such oilfield operations as water shutoff, profile modification, and channellings sealing in oil production and water injection wells. Its applications are restricted owing to fast reaction with water. Two modified urethane precondensates with all reactive -NCO end groups terminated are prepared: oil soluble, OTPT, and water soluble, WTPT. The OTPT in aqueous emulsion prepared with a surfactant under an appropriate catalyst at elevated temperatures and the WTPT in aqueous solution under an appropriate catalyst(at lower temperatures) or inhibitor (at higher temperatures) can be activated at least after 2 hrs to form strong and elastic gels. WTPT can be used as crosslinker for emulsion type PAM in aqueous solution.
出处
《油田化学》
CAS
CSCD
北大核心
1999年第4期314-316,371,共4页
Oilfield Chemistry
关键词
改性
氰凝堵剂
凝胶化
堵水
调剖剂
采油井
封窜
Urethane Precondensate TPT
Modified Urethane Precondensates
Termination of Isocyanate End Groups
Delayed Gelation
Gelling Materials
Water Shutoff/Profile Modification Agents
