Study On Fracture Distribution Mode And Fracture Parameter Optimization Of Lateral Drilling Horizontal Well

In wangyao well area of Ansai oilfield,The main oil-bearing zone is chang 6₁,and sand body distribution is stable.However,with the extension of production time,some wells entered the later stage of development,with low recovery and high water cut.Comprehensive research status of sidetrack drilling at home and abroad,it is found that lateral drilling horizontal well reservoir reconstruction technology is the main method to revive dead wells and improve single well recovery.Therefore,in this thesis,a study on the fracture distribution mode and fracture parameter optimization of lateral drilling horizontal wells is carried out in sai160 block of wangyao block,which provides theoretical support for enhancing block recovery.In this thesis,based on the analysis of side drilling effect,the standard of side drilling selection and layout is established based on the analysis of main controlling factors and fuzzy comprehensive evaluation method.Then based on the established standard of lateral well selection and layout,well Gao C61-9H well group was selected to optimize the lateral horizontal well staged fracturing.Firstly,based on the distribution characteristics of remaining oil and pressure field in Gao C61-9H well group,optimize the optimal target location.Then,the PETREL RE integrated reservoir working platform was used to optimize the fracture layout mode and fracture parameters of lateral drilling horizontal wells.The optimal fracturing scheme was selected,which had the target position at 170 m waterline side,The length of the horizontal section is 115 m,fracture length 200 m,conductivity 15 D·cm,number of 6 fractures,and equal length fracture layout.On this basis,optimizing construction parameters,and the segmtioned fracturing optimization design scheme of Gao C61-9H well group lateral drilling horizontal well in wangyao block is formed.After the program is implemented,The initial daily oil production of the measure well increased by 1.35 times,and the average water cut decreased by 44.6%.Through systematic effect analysis and numerical simulation study of lateral drilling in the early stage of the reservoir,the criteria for selecting and distributing wells by lateral drilling and optimized fracture parameters are obtained,which have certain reference and guidance value for low permeability sandstone reservoir to recover single well production and improve ultimate recovery factor.