公开(公告)号：US20210003742A1

公开(公告)日：2021-01-07

申请号：US17021099

申请日：2020-09-15

Applicant: UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING

Inventor： WEIYAO ZHU ,  HE LIU ,  YUNFENG LIU ,  QINGLIN SHU ,  ZHIYONG SONG ,  MING YUE ,  ZENGLIN WANG ,  DEBIN KONG ,  AISHAN LI ,  BINGBING LI ,  GUODONG ZOU

IPC: G01V99/00 ,  E21B43/26 ,  E21B47/06 ,  E21B49/00 ,  E21B49/08 ,  G06F30/20

Abstract: A simulation method for flow field of multi-stage fracturing on horizontal well in tight oil reservoir is provided. The tight oil reservoir comprises multiple horizontal wells with multi-stage fracturing, and for any horizontal well of the multiple horizontal wells, the method comprises: establishing a seepage mathematical model involving threshold pressure gradient according to reservoir physical property data and production data of the horizontal well, and determining formation pressure distribution of the horizontal well after multi-stage fracturing production according to the seepage mathematical model; determining formation pressure field distribution of the horizontal well after multi-stage fracturing production according to the formation pressure distribution and basing on principle of complex potential superposition; and establishing a criterion for identifying effective producing range of the horizontal well according to the formation pressure field distribution, and determining flow field range of the horizontal well according to the criterion.

公开(公告)号：US20200225384A1

公开(公告)日：2020-07-16

申请号：US16837078

申请日：2020-04-01

Applicant: UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING

Inventor： WEIYAO ZHU ,  MING YUE ,  YUWEI LIU ,  WENCHAO LIU ,  YUNFENG LIU ,  DEBIN KONG

IPC: G01V99/00 ,  E21B49/00

Abstract: The present disclosure provides a method for optimizing bunch distance of fractured horizontal wells of shale gas, which relates to the technical field of oil exploration. The method comprises first establishing a stress field distribution model for a single fracture; then establishing an induced stress distribution model of segmented single-bunch fracturing for a horizontal well; later establishing an induced stress distribution model of segmented multi-bunch fracturing for a horizontal well; last optimizing fracturing parameters and fracture distance according to the distribution pattern of the induced stress difference.The method considers the stress barrier, stress interference effects, and the variation of the effective net pressure during the synchronous expansion of fractures, so the calculation model is more in line with the actual working conditions, has higher precision, and can provide more accurate theoretical guidance for the optimization design of segmented multi-bunch fracturing of a horizontal well.