WELL SCREEN Russian patent published in 2003 - IPC

FIELD: mining industry, extraction of product from wells. SUBSTANCE: invention refers to well screens intended for filtration of product raised from water, oil and gas wells. Given well screen includes perforated body, cylindrical springy bearing frame fitted with plug attached to its lower end, hose basket pulled over bearing frame and coming in the form of gauze belt spirally wound on bearing frame with overlapping of turns so that turns of gauze belt slide one with reference to another with compression or extension of cylindrical springy bearing frame. Upper end of gauze belt is anchored in upper part of body jointly with upper end of cylindrical springy bearing frame. Lower end of gauze belt is attached to above-mentioned plug. Value h of overlapping of turns between lower face of overlapped turn of gauze belt and upper face of next overlapping turn of gauze belt equals 2/3H to 1/3H, where H is width of gauze belt. EFFECT: simplified design of well screen, increased efficiency of self-cleaning of well screen, raised reliability and prolonged service life of well screen with simultaneous reduction of its cost. 1 cl, 1 dwg