关键词: 自悬浮支撑剂, 　覆膜材料, 　携带液, 　储层伤害率, 　渗透率

Abstract: The construction process of "carrying liquid + supporting agent" has been adopted in field fracturing. The preparation and transportation of carrying liquid not only cost a lot of manpower and material resources, but also have poor ability to deal with emergencies in the mine. The self⁃suspension proppant has been prepared and injected at the scene, and its product filtration and its influence on reservoir permeability have been highly concerned by petroleum technicians. The experimental study and mechanism analysis of the effect of fluid loss of self⁃suspension proppant on core permeability are carried out. The results show that when the injection speed was constant, with the core permeability increased, the filtration loss got increased, the damage rate decreased. With the gel breaking time increased, the amount of filtration loss got larger and the damage rate decreased. The degree of influence of gel breaking fluid on core permeability had little relation with its viscosity, which mainly depended on the amount of residue retention and erosion resistance in porous media after glue breaking. Under the condition of "constant pressure experiment", the larger the pressure difference of filter loss, the larger the amount of filter loss, and the damage rate presented the trend of "first increase and then tend to be stable". Compared with the constant speed test, although the amount of filtration loss is relatively small, the damage rate is high. Relationship between the damage rate of three kinds of coating materials to reservoir: hydrophobic associative polymer > medium molecular weight polymer > guanidine adhesive.

Key words: Self?suspending proppant, Coated material, Carrying liquid, Reservoir damage rate, Permeability