The Thin And Poor Pay Zones Producing Evaluation And Technology Policy Limitation Research On Xing-6Blocks

Among current oil in place in China, a large part of which is in poor and thin reservoir,whose natural flow potential is very low. Besides low natural permeability and poor physicalproperty of reservoir, at later producing stage of oilfield, the formation generates irreversibleplastic deformation due to the deep drop of formation pressure, which lowers the permeability;these reservoirs have small effective thickness, severe heterogeneity in physical properties,and discontinuous plane distribution, which makes the effective development in poor and thinreservoir harder. Based on evaluation of producing state in poor and thin reservoir, Xing-6ofDaqing oilfield is studied to find affecting factors on producing state in poor and thinreservoir and ascertain major limitations on technical policy, in order to provide theoryevidence for effective development in poor and thin reservoir.In poor and thin reservoir, based on previous research, the perforating and producingstate is valuated, including washing state in core holes and effect of fracturing wells; bycorrelation coefficient method, grey association analysis, covariance analysis, major physicalproperty parameters affecting producing state in the reservoirs are analyzed comprehensively,the effect of interlayer heterogeneous parameters on producing state is studied, includinggraduation, variation coefficient, dash coefficient; different injection and production type ofideal numerical simulators are established, effect of injection and production type onproducing state is studied, the derivation of areal sweep efficiency and well spacing typecurve is dealt by reservoir engineering method, the effect of well spacing on producing state isstudied, and reasonable limitation on technical policy is determined.