Abstract: In order to improve the development of Block F142 reservoir,large-scale fracturing development technology has been studied.The well pattern and well spacing are optimized by comprehensive utilization of limited well spacing,economic limit well spacing and economic rational well spacing.Based on the design principles of deep penetration,long fracture length,high concentration sand placement,low damage and low risk,treatment parameters such as sand volume,displacement,sand concentration and pad volume are optimized by the 3D fracturing optimization design software(FRACPROPT)for the purpose of optimal production.According to the requirements of formation compatibility,treatment time and scale on fracturing fluid properties,fracturing fluid is selected.Then the large-scale fracturing development mode is determined.Based on the optimization results,reverse 9 spot well pattern should be used for block F142,as well as large-scale hydraulic fracturing featuring"large sand volume,large displacement,large amount of pad fluid,medium sand fluid ratio"(proppant volume: 55-70 m3,displacement: 5.0-6.0 m3/min,ratio of pad fluid to proppant volume: 2.5-3.0,average sand fluid ratio:20%-25%).22 well large-scale fracturing treatments have been completed with the average amount of proppant of about 75 m3 per well,average oil production per well 22 t/d after fracturing form 0.8 t/d before the treatment and showed significant production increase.It is proved that the massive fracturing can improve development efficiency of Block F142 providing reference for the development of similar reservoirs.