Nanoarchitectonics and performance evaluation of a Fe₃O₄-stabilized Pickering emulsion-type differential pressure plugging agent

Abstract With the rapid growth of natural gas consumption capacity, important role storage in seasonal peak shaving and emergency response is gradually emerging. Long-term forced production injection will lead to problems such as wellhead equipment leakage string seal failure. Replacing not only costly but also takes a long time. Aiming at thread caused by multiple rounds storage, Pickering emulsion differential pressure plugging agent with self-sealing function under certain difference was developed. We selected carboxyl nitrile latex self-polymerization modified nano-stabilizer Fe 3 O 4 @SiO 2 . The excellent performance prepared combination particles non-ionic emulsifier OP-10. test carried out for simulated oil pipe thread. When rate 50 mL/min, no occurred 20 MPa after plugging. expected achieve without moving rebuild integrity wellbore.