The Effective Law And Potential Analysis On Profile Control Of WY Infilling Area

Since it began to produce in the 1980 s,water cut at WY infilling area has reached up to the mediumand highlevel after years of development.According to its fracture development,dynamic monitoring and developmentdynamic,directions of fractures in the reservoir are obvious so that water flowing into main-direction wells is much more,the number of high water cut wells is greater,flooded area is bigger further,loss of production capacity is worse.The lateral wellsare not waterflooded for a long time,affecting the development effect of the whole area.In order to sovle the above problems in the development stagebased on the study of fine geology of Chang 6 reservoir,it takes a research on the effective law of 33 profile control well groups by manys ways,such as reservoir engineering,logic analysis,field data statistics,Lorents curve,dynamic analysis and other methods.Profile control of 25 well groups is obviously significant,however profile control of 8 well groups is not obvious.The correlation degree between the influencing factors and the profile control effect is calculated by gray theory correlation analysis,and is ranked.The results show that profile control agent volume has the greatest effect on profile control effect and the factors in order of decreasing influencing degree are profile control agent volume,permeability variation coefficient,connectivity ratio,well group reserves,water cut and the number of slugs.Through residual oil monitoring and the statistical analysis of non-uniform water well after profile control,it is suggested that profile controlis taken once more for the two wells of Wang22-03 and Wang29-06.Finally,the optimization of the profile control system is carried out.The optimal concentration of gel is between 0.8% and 1.6% and the concentration of crosslinkeris between 0.4% and 1.9%.The WY infilling area is optimized for profile control.Using the composite slug,which are 7 slugs,is the most suitable.The results of this research providea strong theoretical basis and technical guidance to theprofile control effect evaluation and profile control technology,whichhave great realistic significance and good field application value for the efficient development.