公开(公告)号：US10976470B2

公开(公告)日：2021-04-13

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 ,  G06F30/20 ,  E21B49/08 ,  E21B43/26 ,  E21B47/06 ,  E21B49/00 ,  G06F113/08

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：US10761241B2

公开(公告)日：2020-09-01

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 ,  E21B43/26

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.

公开(公告)号：US11371344B2

公开(公告)日：2022-06-28

申请号：US16620657

申请日：2018-09-21

Applicant: University of Science and Technology Beijing

Inventor： Weiyao Zhu ,  Zhiyong Song ,  Ming Yue ,  Yunfeng Liu ,  Zhen Chen ,  Dongxu Ma ,  Wenchao Liu ,  Qian Qi

IPC: E21B49/02 ,  E21B43/26 ,  G01V99/00 ,  G01N3/08

Abstract: A method for identifying a medium structure coupling and a fracture network morphology of a shale gas reservoir includes the following steps. Firstly, performing a fracturing test on shale cores by using a modified Brazilian disc test and categorizing the fracture network morphology. Secondly, performing a shale matrix-fracture structure and stress sensitivity test on the shale cores having different fracture network morphology. After that, determining a stress sensitivity constant of different fracture network morphology according to indoor core data and finally preparing an identification chart of the fracture network morphology based on an indoor core stress sensitivity test combined with a production practice. The identification chart can be applied to an actual fracturing well, and the fracture network morphology is directly identified by a real-time effective stress and a normalized flow.