Research On Production Laws Of Fractured Wells In Low Permeability Reservoirs

Shengli oilfield Fan-162 block is a low porosity and ultra-low permeability reservoir,with poor physical property and pressure sensitivity,which results in fluid flow resistance increasing and the extremely low production.The water absorption ability is very poor even if increasing the injection pressure in the process of water flooding,which is adverse to the steady production of the oilfield.So far,hydraulic fracturing technology is prevalent effective stimulating treatment in ultra-low permeability reservoir.However,the shallow understanding about production law of fractured wells,especially fractured horizontal wells,leads to a series questions of later production set and design of single well.Thus,the research of production law of fractured wells in ultra-low permeability reservoir contributes for better knowing and analysis of the effects of fracturing.Firstly,in view of the real data of the block,a typical numerical simulation model of a hydraulic horizontal well is established,and the effects of reservoir geological parameters,fracturing parameters,pressure sensitivity and others on production is investigated.And on this basis,a new production prediction formula is presented,which can be employed to forecast daily oil production of a hydraulic horizontal well with different parameters at different times.On the other hand,on account of the integral fracturing,five-spot flood system of Fan-162 block at the beginning of production,an integral fracturing typical model is established,and the effects of oil well fracture parameters,water well fracture parameters and wellbore pressure on the fractured wells' production is investigated.On this basis,the oil well fracture parameters and water well fracture parameters is optimized.The research result demonstrates that the optimal parameters of integral fracturing,fivespot flood system are oil half-fracture length 150 m,oil fracture conductivity 30?m2·cm,water half-fracture length 100 m,water fracture conductivity 40?m2·cm.And the oil production of four oil wells are all improved and their water cuts are declined after putting the optimal scheme into practice,compared to the original scheme,which is helpful to the spot.