METHOD OF DEVELOPING OIL POOL WITH NONUNIFORM CLAY-CONTAINING RESERVOIR Russian patent published in 2000 - IPC

FIELD: oil-producing industry. SUBSTANCE: method includes injection of working agent through injection wells and oil withdrawal through producing wells. Working agent is used in the form of mineralized sewage water. Injected through injection wells are fringes of aqueous solution of acid with clay stabilizer. Operation conditions of producing and injection wells are changed for changing direction of filtration flows in formation. Additional injection well are drilled in formation zones with low clayiness. Injection pressure in additional injection wells is maintained at level of opening of vertical fractures. When working agent is injected at pressure of operating of vertical fractures, withdrawal of products is intensified in producing wells located in zones with high clayiness. EFFECT: increased oil recovery from pool.