公开(公告)号：US20200300082A1

公开(公告)日：2020-09-24

申请号：US16899546

申请日：2020-06-11

Applicant: SOUTHWEST PETROLEUM UNIVERSITY ,  PETROCHINA COMPANY LIMITED

Inventor： Pingli Liu ,  Xiang Chen ,  Heng Xue ,  Honglan Zou ,  Liqiang Zhao ,  Nianyin Li ,  Daocheng Wang ,  Zhifeng Luo ,  Juan Du ,  Chong Liang ,  Mingyue Cui ,  Fei Liu ,  Changlin Zhou ,  Rong Zeng

IPC: E21B47/10 ,  E21B43/27 ,  G06F30/28 ,  G06F17/11

Abstract: The invention discloses a calculation method for dynamic fluid loss of acid-etched fracture considering wormhole propagation, which is applied to pad acid fracturing process, comprising the following steps: Step 1: dividing the construction time T of injecting acid fluid into artificial fracture into m time nodes at equal intervals, then the time step Δt=T/m and tn=nΔt, where, n=0, 1, 2, 3, . . . , m, and to is the initial time; Step 2: calculating the fluid loss velocity vl(0) in the fracture at t0; Step 3: calculating the flowing pressure distribution P(n) in the fracture at tn; Step 4: calculating the width wa(n) of acid-etched fracture at tn; Step 5: calculating the wormhole propagation and the fluid loss velocity vl(n) at tn; Step 6: substituting the fluid loss velocity vl(n) into Step 3, and repeating Step 3 to Step 6 in turn until the end of acid fluid injection.