METHOD OF OPERATION OF OIL WELLS WITH FLOODED PRODUCING FORMATIONS, DEVICE FOR METHOD EMBODIMENT

FIELD: oil and gas production, particularly, methods of operation of oil wells whose producing wells are flooded. SUBSTANCE: method includes separation of products in well with help of downhole separator provided with membrane filter. This filter is permeable for one of components of formation fluid. Separated oil is pumped to ground surface. Oil from water is separated by membrane filter in bottomhole zone. For this purpose, continuous depression of 0.01-4.0 MPa is produced across filter to separate oil and to leave water in formation. To prevent contamination of membranes, preliminary treatment of produced products is effected, and/or preliminary and periodic treatment of membrane surface is carried out, or use is made of membranes with antiadhesive properties. Device for method embodiment includes downhole separator provided with membrane filter permeable for one of formation fluid components and made of membrane polymer material. Device also has pump for producing continuous depression of 0.01-4.0 MPa across outlet of membrane filter. This filter is installed in bottomhole zone of well and made in form of hollow-fibrous membrane module from cellulose acetate or polysulfone, whose membranes featuring antiadhesion properties. EFFECT: reduced material and power consumption in oil production, prevented contamination of membrane surfaces, prolonged service life of membrane modules. 2 cl, 1 dwg