| Recently,oil fields gradually enter the high water-cut stage with the development of the mining intensity in low-permeability oil field,which may be caused by the nature of oil field,the of water wells and oil wells caused by waterflooding,oil and water layer connecting led by fracturing,etc.Fractured reservoir with bottom water,characterized by a dual-porosity media:fracture and bedrock,possesses stronger energy of basal water and well develops cracks,which easily results in the bottom water streaming quickly along the fractures and the rapidly increasing of water-cut rate,and further lead to the sharp decline of oil production.Consequently,the development of low-permeability reservoir and the increase of petrol production are significantly blocked.Researchers at home and abroad have done many researches on the development of low permeability reservoir,working out plugging water and profile control technologies aiming at the developing of low-permeation reservior.These technologies has obtained obviousely effects of application,and it will keep optimizing with the development of reservior.This paper summarizes the current water plugging technologies of the low permeability reservoir developing and the corresponding difficulties.Through the analyses of water breakthrough characteristics,mining situation,and oil well injection-production curve in Chang2 major reservoir of Ansai oil field,together with the analyses of the reservoir sedimentary characteristics,pore characteristics and data of layers in Yanchang Formation of Ansai oilfield,three kinds of water flooding types are classified:fracture type,pore type,fracture-pore type,and six types of water plugging agent have been selected on the basis of the three types,which may optimizes placement method and design of slug.Thus,further implementation of water plugging generated a positive effect on Chang2(bottom water developing well)major reservoir of Ansai oilfield. |
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