A Modeling Study Of The Productivity Of Horizontal Wells In Shale Oil Reservoirs:Effects Of Dense Cutting Hydraulic Fracturing In Jimsar,Xinjiang

The commercial production of low permeability shale reservoirs usually requires the use of horizontal wells and hydraulic fracturing tight cutting technology to greatly improve the reservoir fluid mobility.With the increase of the number of fracture sand the decrease of fracture spacing in hydraulic fracturing operation,the phenomenon of inter fracture interference caused by induced stress field in the formation needs to be paid great attention.Previous modeling studies usually focus on the impact of inter fracture interference on the geometry of multi-stage and multi-cluster fractures,while there are not many related studies on the impact of horizontal well productivity.Firstly,this paper reviews the development status of shale oil and gas reservoirs at home and abroad and the research status of hydraulic fracturing and reservoir numerical simulation,expounds the basic theories of hydraulic fracturing and reservoir numerical simulation,and then puts forward a modeling scheme for joint simulation of fracturing productivity by using the finite element numerical calculation method based on hydraulic fracturing tight cutting mechanism and elastic-plastic theory of porous media.The process utilizes rich field data,including rock physics,geomechanics and hydraulic fracturing design parameters.Through numerical simulation,the geometric characteristics of hydraulic fractures and the actual cumulative production in the reservoir are calculated quantitatively.The results show that the fewer clusters per stage,the closer the stage distance and the lower the fracturing fluid injection rate are conducive to the uniform growth of fractures in clusters and stages,and can effectively reduce the interference between fractures.Fracturing modeling results are usually related to productivity modeling results,while examples with stronger inter fracture interference can still provide high productivity.This study establishes the quantitative relationship between fracturing inter fracture interference and horizontal well productivity,which provides a certain simulation basis for the field construction parameter optimization of horizontal well dense cutting hydraulic fracturing and reducing inter fracture interference.