METHOD OF DEVELOPMENT OF FLOODED OIL FORMATIONS WITH ZONAL PERMEABLE HETEROGENEITY Russian patent published in 1999 - IPC

FIELD: oil-producing industry. SUBSTANCE: to increase horizontal sweep of flooding of oil formation with zonal permeable heterogeneity, producing well flooded with injected water is selected with permeability ratio in perforated interval amounting to less than 1.5. Introduced through producing well into formation is large-volume margin of clay suspension with clay content of 15-30 kg/cu.m which is calculated with assumption of uniform radial displacement of margin in formation in radius of 50 m round producing well. Fraction of volume of filling of reservoir pores and thickness equal, respectively, to one half of medium value of porosity factor and thickness of water-receiving interval of formation at wellhead pressure of injection. It is taken equal to pressure on water injection line on field. In this case, for conversion of clay suspension margin injected into formation into flow-deflecting barrier, producing well is closed. Flow-deflecting barrier is deformed and tightened under pressure of injected water front moving from interacting injection well. EFFECT: increased recovery of reserves due to sweep by displacement of oil from reservoir stagnant zones.