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.

公开(公告)号：US10889745B1

公开(公告)日：2021-01-12

申请号：US17020854

申请日：2020-09-15

Applicant: SOUTHWEST PETROLEUM UNIVERSITY

Inventor： Fa Yang Jin ,  Wan Fen Pu ,  Wen Ge Hu ,  Hai Yang Zhao ,  Long He ,  Dai Jun Du ,  Ke Xing Li ,  Bao Lei Jiao ,  Bo Ren ,  Lin Sun ,  Zhen Qian ,  En Long Zhen ,  Rui Liu ,  Xiao Qing He

IPC: C09K8/42 ,  C09K8/512 ,  C04B14/10 ,  C08K3/34 ,  C08L33/02 ,  C08L33/26 ,  C04B26/04

Abstract: A plugging agent with temperature-resistant, salt-resistant and high-expansion for plugging large fractures and a preparation method thereof of the present disclosure are provided, the plugging agent system consists of the following components: main agent: 6%˜10%, cross-linking agent: 0.6%˜1%, initiator: 0.006%˜0.01%, additive: 6%˜14%, and the rest being water; the preparation method includes the following steps: adding montmorillonite to water to prepare a montmorillonite dispersion system; adding the main agent, the cross-linking agent and the initiator to the montmorillonite dispersion system to prepare a main agent solution; putting the main agent solution into an oven with a temperature range with 90˜20° C. for 9˜48 h to obtain gelation, the adhesive strength of the agent system can reach grade H, with 50˜80 expansion multiple, good strength after being expanded and good water plugging effect under the condition of a temperature of 140° C. and 250,000 degree of mineralization.