公开(公告)号：US11162323B2

公开(公告)日：2021-11-02

申请号：US16847683

申请日：2020-04-14

Applicant: SOUTHWEST PETROLEUM UNIVERSITY

Inventor： Gao Li ,  Long He ,  Zujun Jiang ,  Rui Li ,  Yi Feng

IPC: E21B33/134 ,  C04B14/20 ,  C04B18/18 ,  C04B18/24 ,  C04B26/26 ,  C09K8/42 ,  C09K8/44 ,  E21B33/138 ,  E21B49/00

Abstract: A multi-slug staged method for plugging a fractured formation includes: determining an average opening of fractures around a well as D, an average particle size of bridging particles for first-stage plugging as D1 that is slightly less than D, and average particle sizes of plugging particles for second to last-stage plugging as D2-Dn, where Dn is small enough to form a tight plugging layer; and sequentially injecting a plugging slurry only containing the bridging particles having the average particle size of D1, plugging slurries containing the plugging particles having the average particle sizes of D2-Dn-1, and a plugging slurry containing the plugging particles having the average particle size of Dn into the fractures to achieve the fractured formation plugging.