Research on Fracturing Damage Mechanism of Formation and Evaluation Method

During hydraulic fracturing process,fracturing fluid may invade the formation,and cause the water lock damage,migration of fines damage,expansion of clay damage,precipitate blocking damage,emulsification damage,cooling formation damage,adsorption and retention damage,reverse wetting damage,fracturing fluid residue damage.In this paper,the mechanism of fracturing fluid damaged the formation is researched and evaluation method of fracturing damage is analyzed.Researching the fracturing damage mechanism of formation may be positive significance to optimize fracturing fluid system,reduce fracturing damage of formation and improve the effect of hydraulic fracturing.