Evaluation method for reservoir damage of cementing slurry

The damage of cement slurry to the reservoir is directly related production oil and gas wells, a problem that must be solved for efficient economic development reservoirs. According characteristics field conditions caused by slurry, this paper analyzes main factors affecting degree damage, puts forward technical index requirements evaluation device, establishes method in case loss injection. results show influence temperature on layer small, pressure difference large; When 22 Mpa, penetration rate pore center without mud cake attachment about 43%. After day core maintenance, permeability will reach 61.2%; micro-fractured very serious. 1 after solidification as high 83%, with an average 76.5%; risk leakage low, system low density water can used cementing operation. filtrate should better matched formation clay minerals, water, drilling fluid filtrate. high, high-density balanced cementing, control other technologies avoid operations. are more difficult, dissolve at later stage. research provide theoretical data support study reducing reservoir.