METHOD OF DEVELOPMENT OF WATER-ENCROACHED NONUNIFORM OIL FORMATION Russian patent published in 2001 - IPC

FIELD: oil producing industry. SUBSTANCE: method includes successive or simultaneous injection of aqueous suspension of wood flour and clay or aqueous suspension of wood flour into injection well at pressure lower than that of fracture formation. Velocity of flow of aqueous suspensions is taken larger than velocity of settling of particles of wood flour and clay and with orientation of fibers of wood flour in direction of suspension flow. In this case, used for the purpose is mixture of wood flour of coniferous and leaf species, or wood flour of leaf species, or wood flour of leaf species with particle sizes in which particle length-to-diameter ratio is (3-20):1, respectively. Suspensions are injected with injectivity indexes ratio of highpermeability and low-permeability formation zones equaling (1.3- 11.0): 1, respectively. Then, oil is recovered from producing wells. EFFECT: more efficient method of development of water-encroached Non-uniform oil formation. 2 tbl, 6 ex