METHOD OF DEVELOPMENT OF WATER-ENCROACHED NONUNIFORM OIL FORMATIONS (VERSIONS) Russian patent published in 2001 - IPC

FIELD: oil producing industry, particularly, methods of development of water-encroached nonuniform in geological structure fractured-porous formations of terrigenous and carbonate deposits by water-flooding. SUBSTANCE: method includes injection of aqueous suspension of wood flour through injection well and product withdrawal from producing well. In so doing, additionally injected is aqueous suspension of wood dust - waste of plywood polishing. Aqueous suspensions of wood flour and wood dust are injected successively or simultaneously. Method includes successive-alternating injection through injection well of aqueous suspension of wood flour and clay suspension and withdrawal of product from producing well. EFFECT: highly efficiency of method due to active development of slightly-drained low-permeability zone of formation by closing fractures and high permeability zones of formation to facilitate increasing of recovery of oil reserves from pool. 4 cl, 1 tbl, 7 ex