公开(公告)号：US10794180B2

公开(公告)日：2020-10-06

申请号：US16305895

申请日：2017-09-27

Applicant: SOUTHWEST PETROLEUM UNIVERSITY

Inventor： Gao Li ,  Yi Feng ,  Shunhui Yang ,  Yijian Chen ,  Na Wei ,  Yingfeng Meng ,  Rui Li

IPC: E21B49/00 ,  E21B21/08 ,  E21B21/10 ,  E21B34/08 ,  E21B43/12 ,  E21B43/26 ,  E21B47/06 ,  G01M99/00

Abstract: A mineshaft-stratum fracture coupled flowing simulation experiment device includes a simulated mineshaft flowing system, a simulated stratum system, a simulated fracture system and a data acquisition system. The simulated mineshaft flowing system includes simulated mineshaft, simulated drilling rod, drilling fluid storage tank, stirring motor, and drilling fluid screw pump. The simulated drilling rod is located in center of the simulated mineshaft. The stirring motor is provided in the drilling fluid storage tank. The drilling fluid screw pump is connected to an inlet end of the simulated drilling rod through the drilling fluid storage tank. The simulated stratum system includes simulated stratum, clean water storage tank, separation tank, gas storage tank, gas air-compressor, and clean water screw pump. The gas storage tank is connected to the gas air-compressor and is connected to the simulated stratum through a gas pressure regulating valve.

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.