| During the development of layered reservoir without crossflow,due to the producing layers are often heterogeneous and larger span between layers,cause certain layers with the lower permeability are often difficult to meet the requirement of economic production.To make use good of this part of layered reservoir,an effective method is the application of hydraulic fracturing technology to transform the formation.For this kind of reservoir,using conventional single-layer fractured well analysis method to interpretation is not accurate enough,only obtain the multilayer reservoir average characteristics,So it is important to study method of fractured well analysis in multilayered reservoir.This paper maked a deep research on method of fractured well analysis in multilayered reservoir,achievements are as follows:(1) Considering wellbore storage and skin effect,Layered homogenous reservoir model without crossflow and linear flow model of infinite conductivity vertical fracture in layered homogenous reservoir without crossflow are established and worked out,External boundaries are considered as infinity,line constant pressure,line sealed.Typical curves are plotted by Matlab software,and then comparison and analysis of the similarities and diffrerences between layered homogenous reservoir model and single layer homogenous reservoir model;(2) Considering wellbore storage and skin effect,Bilinear and Trilinear flows model of finite conductivity vertical fracture in layered homogenous reservoir without crossflow are established and worked out,External boundaries are considered as infinity,line constant pressure,line sealed.Typical curves are plotted by Matlab software;(3) Application of new approximate (semi-analytical) solutions for the wellbore pressure and fractional flowrate responses of layered reservoir without crossflow;(4) Well test models are added into Swift well test analysis software,any wells from Oilfeild are interpreted,the results verify the above models. |
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