关键词: 朱寨子油区,    ,  , 储层物性,    ,  , 伤害机理,    ,  , 保护技术

Abstract: The ZhuZhaizi oilfield reservoir has the characteristics of low pressure coefficient, poor physical property, low permeability, micropore and microthroat, large specific surface and high sand concentration. It is easily damaged by the solid phase matter, liquid phase matter, polymer adsorption and sensitive mineral content. On the base of analyses about ZhuZhaizi oilfield formation damage mechanism, this paper introduces a method of drilling fluid reservoir protection technology. That is filtrate invasion sensitive damage can be slightly inhibited caused by sensitive mineral content through adding some polymer inhibition and inorganic salts inhibition into drilling fluid. The temporary plugging agent is made by size optimized bridging particle and soften deformable ST3, and it can reduce the amount of drilling fluid intrusion and invasion depth by forming a dense cake. HFR which is compounded by two kinds of surfactants can efficiently reduce oilwater interfacial tension and significantly reduce the damage degree of water block. It also can help to flow back the filtrate invasion liquid phrase, enhance the oil saturation and relative permeability, and improve the formation permeability. So, two methods of drilling fluid reservoir formation technologies are finally given.

Key words: ZhuZhaizi oildom,    ,  Reservoir property,    , Damage mechanism,    ,  Protection technology