MULTIPHASE SCREW PUMP Russian patent published in 2001 - IPC

FIELD: oil industry. SUBSTANCE: multiphase screw pump is designed for handling gas-liquid media consisting, for instance, of crude oil and natural gas. At least one feed screw enclosed in cylindrical bushing is arranged in housing provided with suction and discharge branch pipes. Ring partition forming ring space around feed screw is placed between housing and cylindrical bushing. Through radial holes are made in cylindrical bushing. Lower section of discharge space in housing communicates with ring space through bypass line. EFFECT: reduced consumption at repeated rise of pressure of circulating liquid, prevention of influence of volume of additional liquid onto pump capacity, simplified design owing to self- regulation of amount of delivered liquid. 3 cl, 3 dwg