METHOD OF OPERATION OF WELL OF MULTIFORMATION OIL FIELD Russian patent published in 1997 - IPC

FIELD: oil producing industry; applicable in concurrent combined or separated operation of multiformation wells with underlying water in lower formation. SUBSTANCE: method includes drilling-in the producing formations and simultaneous withdrawal of product from each formation with regulation of withdrawal as formation pressure decreases. In this case, casing string located against water-oil formation with underlying water and against oil formation is provided with filters, with acid-soluble plugs. Filter against oil formation is made for prevention of penetration of water from water-oil formation. Its operation is continued up to permissible water cutting of oil or reduction of its production rate. Then, water-oil formation is disconnected and withdrawal of oil from formation is continued. EFFECT: provision of economically efficient withdrawal of oil from formations. 2 dwg