Numerical Simulation On Production Forecast Of Well By Tip Screen Out Fracturing

Hydraulic fracturing has been the main treatment of well stimulation,and the evaluation of its effect is becoming more important. As a part ofevaluationofpostfractureresponse,moreandmoreattentionhas beenpaidtoresearch on the forecast of production performance. Tip Screen Outfracturing (TSO) is a new technology of developing the high-permeabilityreservoir, so the productivity forecasting of well by TSO fracturing is varysignificant.Unconsolidated sand has the character of stress sensitivity, and thephysical parameters of reservoir will change with pore pressure. On the basisof considering gravity, capillary pressure and skin damage, a percolationmodel with three dimensions and two phases of reservoir and fracture isdeduced and established in this paper, which combinates the dynamic modelof permeability and porosity. The software of production performanceforecasting is developed with Visual Basic 6.0. The main factors ofinfluencingthe productivityof fracturedwell byTSOfracturingare analyzedsystematically by using the self-developed software, which include workingsystem, reservoir boundary condition, well control areas, water saturation,different relative permeability curve, fracture half length, fractureconductivity, stress sensitivity and so on. The influence of fracture conductivity and fracture half length has the same trend; Wetting state ofrock has a little influence on production performance; At the same time, theproduction performance of fractured well is affected by the dynamicparameters of reservoir, and the bigger the formation permeability has, thebigger is the influence of stress sensitivity on production performance;Permeability is the major parameter of stress sensitivity; The creationdynamic fracture will compress the zone near fracture surface, which willreduce the formation permeability, and production will decrease finally.