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.

公开(公告)号：US20210238973A1

公开(公告)日：2021-08-05

申请号：US17149015

申请日：2021-01-14

Applicant: UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING

Inventor： WEIYAO ZHU ,  ZHIYONG SONG ,  JIANFA WU ,  SHOU MA ,  DEBIN KONG ,  MING YUE ,  ZHEN CHEN ,  YUBAO GAO

IPC: E21B43/26 ,  E21B43/14

Abstract: The present disclosure provides a method and device for developing shale gas by tapered gradient pressure drop with multi-stage fractured horizontal well; the method comprises: acquiring fracturing crack form parameters of the multi-stage fractured horizontal well and reservoir characteristic parameters of nearby formation; dividing the formation near the shale gas multi-stage fractured horizontal well into strongly transformed area, weakly transformed area and matrix area; establishing pressure difference-flow models of gas-phase and water phase of the three areas respectively, and coupling the models of the three areas to establish production equation of the multi-stage fractured horizontal well; according to the production equation of the multi-stage fractured horizontal well, performing numerical simulation with different combinations of production pressure differences in the three stages of the multi-stage fractured horizontal well; and selecting a combination of production pressure differences with the greatest economic benefit as combination of production pressure differences.

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：US20210003004A1

公开(公告)日：2021-01-07

申请号：US17027951

申请日：2020-09-22

Applicant: UNIVERSITY OF SCIENCE AND TECHNOLOGY BEIJING

Inventor： WEIYAO ZHU ,  MING YUE ,  JIANFA WU ,  KAI LIU ,  ZHEN CHEN ,  ZHIYONG SONG ,  DEBIN KONG

IPC: E21B49/00 ,  E21B47/10

Abstract: A method for identifying structure of flow field in unconventional gas reservoir is provided. The unconventional gas reservoir comprises at least one horizontal well, for any horizontal well in the at least one horizontal well, the method comprises: during fracturing fluid flowback stage, obtaining first production data, and drawing an actual production curve diagram of the fracturing fluid flowback stage; obtaining reservoir physical parameters corresponding to different fracture network forms and second production data, and performing numerical simulations on water production rate, gas production rate and casing pressure of the fracturing fluid flowback stage, and drawing layouts of structure of flow field corresponding to different fracture network forms of the fracturing fluid flowback stage; and comparing the actual production curve diagram with the layouts of structure of flow field corresponding to different fracture network forms to identify structure of flow field of the reservoir after fracturing.

公开(公告)号：US20200224522A1

公开(公告)日：2020-07-16

申请号：US16833806

申请日：2020-03-30

Applicant: UNIVERSITY OF SCIENCE AND TECHNOLOGY, BEIJING

Inventor： Weiyao ZHU ,  Kun HUANG ,  Zhen CHEN ,  MING YUE ,  ZHIYONG SONG ,  HUA LI ,  BAICHUAN WANG ,  DEBIN KONG

IPC: E21B43/30 ,  E21B43/16 ,  E21B41/00

Abstract: This disclosure provides a method of optimizing well spacing for shale gas development. It belongs to the technical field of hydrocarbon reservoir exploration and development. The method comprises: firstly verifying block area based on the explored geological structure; analyzing the connection situation of a shale reservoir, identifying the minimum developing area units; calculating the recoverable reserves of the units, confirming the candidate units; drilling representative shale cores and analyzing related physical properties; calculating seepage field and pressure field using unified multi-field, multi-flow-regime, and multi-scale mathematical models; calculating the effective recoverable area of each well; and arranging wells based on the rule that the interference among wells is not larger than 10%. Considering the fluid-solid coupling effects, this method can define appropriately well spacing for shale gas exploration and enhance effectively the output of shale gas.