Research On Reasonable Well Pattern For Jilin Extra Low Permeability Oilfield

Jilin Oilfield is typical of low permeability oilfield, the block which reserves abundance and permeability is relatively high has been put into the development, it is an increasing proportion of extra low、ultra low permeability reservoir to the unused reservoir, extra low, ultra low permeability reserves accounts for91%of the proven unused reserves, p extra low permeability reserves accounts for53%of the proven unused reserves. Currently, there is an increasingly prominent contradiction between injection and production in the development of the extra low、ultra low permeability reservoir, and in the future, how to determine reasonable well pattern of the extra low permeability reservoir is the key to improve development effect and the ultimate recovery.In this paper, the microscopic reservoir percolation characteristics is carried out in the extra low, ultra low permeability reservoir representative test block which is preferred considering the distribution of unused reserves, microscopic reservoir evaluation system is established. Based on the nonlinear percolation theory system of extra low permeability reservoir, the reasonable well network systems in the test blocks is researched. Combined with mine practice, the reasonable well pattern and well network evaluation technique of extra low、ultra low permeability reservoir are established eventually and it is the basis for well network deployment in the future efficient development of unused reserves.