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.