公开(公告)号：US11009620B2

公开(公告)日：2021-05-18

申请号：US16790801

申请日：2020-02-14

Applicant: Chengdu University of Technology

Inventor： Haiyan Zhu ,  Yapu Zhao ,  Jianchun Guo ,  Xuanhe Tang

IPC: G01V1/50 ,  G01V1/28 ,  G06F30/23 ,  G06F111/10

Abstract: A method for determining a favorable time window of an infill well of an unconventional oil and gas reservoir, which comprises the following steps: S1, establishing a three-dimensional geological model with physical properties and geomechanical parameters; S2, establishing a natural fracture network model in combination with indoor core-logging-seismic monitoring; S3, calculating complex fractures in hydraulic fracturing of parent wells; S4, establishing an unconventional oil and gas reservoir model and calculating a current pore pressure field; S5, establishing a dynamic geomechanical model and calculating a dynamic geostress field; S6, calculating complex fractures in horizontal fractures of the infill well in different production times of the parent wells based on pre-stage complex fractures and the current geostress field; S7, analyzing a microseismic event barrier region and its dynamic changes in infill well fracturing; and S8, analyzing the productivity in different infill times, and determining an infill time window.

公开(公告)号：US11567233B2

公开(公告)日：2023-01-31

申请号：US16516261

申请日：2019-07-19

Applicant: CHENGDU UNIVERSITY OF TECHNOLOGY

Inventor： Haiyan Zhu ,  Qingyou Liu ,  Yapu Zhao ,  Yang Li

IPC: G01V99/00 ,  G06F30/20

Abstract: A numerical simulation and parameter optimization method for volumetric fracturing of an unconventional dual medium reservoir includes the following steps: based on the theory of dual-medium pore elasticity, in consideration of the friction effect between fractures, developing a viscoelastic-plastic damage model of hydraulic fractures based on explicit time integral; simulating random intersection and bifurcation of hydraulic fractures encountering with natural fractures by adopting a method of embedding zero-thickness fracture units in the inner boundaries of computational model grids, and establishing a mathematical model of hydraulic fracture expansion of volumetric fracturing in the unconventional dual-medium reservoir; compiling a finite element program for complex multi-fracture fracturing and competitive expansion during volumetric fracturing of the unconventional reservoir, and establishing a hydraulic fracturing finite element model of a casing-cement ring-perforation hole in cluster-reservoir matrix containing natural fractures.