A Chart-Based Diagnostic Model for Tight Gas Reservoirs Based on Shut-in Pressure during Hydraulic Fracturing  

作　　者：Mingqiang Wei Neng Yang Han Zou Anhao Li Yonggang Duan 

机构地区：[1]Petroleum Engineering School,Southwest Petroleum University,Chengdu,610500,China [2]Sinopec Northwest Oilfield Branch,Bayingolin Mongolian Autonomous Prefecture,841600,China [3]Southwest Oil and Gas Field Company,Huayou Company,Chengdu,610017,China

出　　处：《Fluid Dynamics & Materials Processing》2025年第2期309-324,共16页流体力学与材料加工(英文)

摘　　要：A precise diagnosis of the complex post-fracturing characteristics and parameter variations in tight gas reservoirs is essential for optimizing fracturing technology,enhancing treatment effectiveness,and assessing post-fracturing production capacity.Tight gas reservoirs face challenges due to the interaction between natural fractures and induced fractures.To address these issues,a theoretical model for diagnosing fractures under varying leak-off mechanisms has been developed,incorporating the closure behavior of natural fractures.This model,grounded in material balance theory,also accounts for shut-in pressure.The study derived and plotted typical G-function charts,which capture fracture behavior during closure.By superimposing the G-function in the closure phase of natural fractures with pressure derivative curves,the study explored how fracture parameters—including leak-off coefficient,fracture area,closure pressure,and closure time—impact these diagnostic charts.Findings show that variations in natural fracture flexibility,fracture area,and controlling factors influence the superimposed G-function pressure derivative curve,resulting in distinctive“concave”or“convex”patterns.Field data from Well Y in a specific tight gas reservoir were used to validate the model,confirming both its reliability and practicality.

关 键 词：Tight gas reservoir volume fracturing G-FUNCTION fracture diagnosis complex fracture network shut-in pressure 

分 类 号：TE372[石油与天然气工程—油气田开发工程]