N Oilfield Fracturing Effect Evaluation And Plan Optimization

Located in western China,shallow layers of reservoir N have h?ge exploration potential with explored petrole?m reserve of 4,22oxlo4 t and gas reserve of 15×108 m3.Since this remote reservoir has extremely low permeability and complex geological conditions,it is hard to develop and obtain economic benefit.According to low permeable reservoir development theory and practiee,it will achieve satisfactory deliverability after stimplation.Th?S,as a main stim?lation method,hydraulic fract?ring is widely ?sed in reservoir N.However,d?e to complicated conditions s?ch as nat?rally fract?re system,long longit?dinal interval and low formation press?re,the s?cess rate of fract?ring is low,which can not match the req?irement of reservoir development.To realize effective fract?ring,it is necessary to eval?ate previo?s fract?ring and optimize f?t?re fract?ring scheme.In this paper,geologic characteristics of target reservoir were firstly analyzed in the view of stim?lation and related technological diffic?lties were fig?red o?t.Sim?ltaneo?sly,previo?s fract?ring technology,fl?id system and proppant were eval?ated based on field data and laboratory st?dy.Then,theory research of postfrac eval?ation method was cond?cted and a mathematical model was established.In combination of geologic characteristics,rock mechanic characteristics,fl?id property and real-time operation data,previo?s fract?ring operations were eval?ated on the basis of postfrac eval?ation theory,advanced fract?ring analysis software and self-developed program.Finally,a specific fract?ring scheme was created on accordance with previo?s eval?ation res?lts.Thro?gh data analysis,laboratory st?dy,theoretical research and comp?tational sim?lation,we systematically eval?ated hydraulic fracturing of shallow layers in reservoir N,drew some disciplinary concl?sions,and optimized fract?ring scheme.All the above jobs will provide theoretical g?idance to fut?re posrfrac eval?ation of reservoir N,as well as other analogo?s naturally fract?red reservoirs with extremly low permeability.