Abstract: In the process of perforating completion operation,the quality of perforation fluid is directly related to production of oil and gas wells.On the basis of x-ray analysis and fluid property of Guan 984 block in the Dagang Oilfield,in accordance with the damage mechanism of perforation fluid to formation,the appraisal researches of perforation fluid about the anti-corrosion properties,the anti-swelling properties,the damage rate of perforation fluid to cores permeability,the compatibility of perforation fluid,formation fluid and fracturing are done.The linear swelling evaluation experiment indicates that the rate of anti-swelling is above 94%;the rate of corrosion is lower than 0.076mm/a;the damage rate of perforation fluid to permeability of cores is lower than 13.76% and the average damage rate is 11.14%;comprehensive experiment shows that the perforation fluid has the ability of anti-high temperature,not forming emulsion with crude oil and has good compatibility to agent.Through the evaluation experiment,solid-free quality perforation fluid system for 984 block in Dagang Oilfield is developed,the requirements of reservoir protection and operation are met.

Key words: Guan 984 reservoir, perforation fluid, evaluation, reservoir protection