The Comprehensive Logging Evaluation Of The Effects Of The Joint Horizontal Well Pattern In The East No.14 District

The three section stratum of the Daqing oilfield is a typical extra low permeability reservoir. The reservoir development is affected by reservoir physical properties, presenting poor adaptability of well pattern, low Oil recovery rate and low degree of producing reserves.With the low injection pressure and high injection volume of horizontal well, the developing experiment of the joint well pattern of horizontal wells for water injection and vertical wells for oil recovery is carried out and achieved the good performance of stabilized injection. But from the actual production capacity of oil production, the production efficiency of each well is not the same. Therefore, it is necessary to explore the main factors of sand body internal affecting water flooding effect and find a reasonable conclusion based on elaborate analysis of reservoir internal non homogeneous characteristics, to provide basis for the further effective exploiting of residual oil in low permeability reservoir.With Y171 oil reservoir group in the horizontal wells- vertical well development block of East 141 Districts the research object and the sedimentary microfacies and reservoir comprehensive evaluation as the starting point of, this article, firstly, apply the core scale logging method to establish calculation method with high accuracy for porosity and permeability, clay content and calcium content and the other storage reservoir parameters;secondly, according to the reservoir interlayer identification standard, a comprehensive analysis of the formation cause, types and distribution of interlayer in Y171 layer group was completed and the method of evaluating reservoir heterogeneity with the interlayer permeability coefficient was proposed; thirdly, based on the results of reservoir internal heterogeneity interlayer permeability coefficient distribution, a detailed analysis of the dynamic effect of block development of each vertical well in the block was made, and it was proposed that the dynamic development effect of the joint well pattern is closely related to the distribution of interlayer. According to the above, it can be put forward that the piecewise fracturing matrix is an effective way to improve the development of the extra low permeability reservoir.