Study On The Damage Law Of The Coupling Stimulation Fracture Fluid Loss In Tight Fractured Reservoir

Hydraulic fracturing has become the key technology to improve the low natural production of tight sandstone reservoirs in recent years.The highly developed natural fractures may connected with artificial fractures during hydraulic fracturing,and will cause fluid loss and permeability reduction along natural fracture.The existing laboratory method to evaluate the damage caused by fluid loss is mainly focus on static evaluation,which results have differences with well site.Due to the violent change of production in the early stage of well opening,it is difficult to study the impact of formation damage on production with laboratory data.Thus,it is necessary to establish a numerical simulation model for research.Based on the geological conditions and field data of Ke Shen area,the applicability of the existing standard for evaluate fluid loss and formation damage is improved to be closer to the actual field situation firstly.Then,the damage mechanism and fluid loss law of three type of fracturing fluids used in the fracturing of Tarim tight gas reservoir are studied.Finally,a numerical simulation model is established to analyze the effects of reservoir damage and viscosity of the fracture fluid on the gas well productivity with the three type fluids.It is concluded that reservoir damage will affect the long-term production of gas well and the viscosity after gel breaking will affect the initial production and flowback.In this paper,combined with laboratory experiment and numerical simulation method,the damage mechanism of fracturing fluid loss and its impact on productivity are studied.The research results provide some new ideas to guide the new fracturing fluid system and reservoir protection measures.