PROCESS OF DEVELOPMENT OF MULTIPLE-POOL OIL FIELD WITH STRATA OF DIFFERENT PENETRATION Russian patent published in 2002 - IPC

FIELD: oil industry, increase of oil recovery from multiple-pool operational objects with strata of different penetration. SUBSTANCE: process includes pumping of clay suspension into flooded strata in amount depending on volume of pores with permission of uniform radial movement of clay suspension in pool around well with injection of dispersing clay particles into porous passages. Fringe is transformed into flow-deviating barrier by clay suspension injected into pool. Injection well with two or more spatially arranged perforated pools with penetrability difference of factor of two or more and at least one production well flooded by pumped water to 80% or more and interacting through analogous pools are chosen. Clay suspension is injected in radius of 20.0 m around well under pumping pressure allowing no formation of cracks in pools. Its amount equals to 0.5 volume of pores of water-absorbing pools of highest penetrability with penetrability difference of 1.5 or less. Content of clay in suspension is assumed to be from 60.0 to 120.0 kg/cu. m depending on penetrability. Injected fringe is compacted by clay suspension by its driving to 20.0 m away from wells to depth of highly penetrable pools by pumping of water. Water is pumped in the amount of 0.5 volume of pores under pressure which is 20-30% higher than working pressure of water pumping assumed in field to maintain pressure in pool. EFFECT: growth of oil recovery from stock of multiple- pool objects thanks to increase of efficiency of envelopment of less penetrable pools of field by flooding.