OIL RECOVERING DEVICE Russian patent published in 1999 - IPC

FIELD: oil production industry. SUBSTANCE: device is intended for lifting liquid hydrocarbons with high gas factor. Device contains string of pump-compressor pipes with well head equipment and bottom-hole pressure regulator which is installed in string of pump-compressor pipe by means of seating nipple. Regulator is made in the form of bellows chamber. Chamber has body with space, bellows and valve. Bellows is located in space of body. Valve is rigidly connected with bellows. Bottom-hole pressure regulator has unit of crossing sections with connecting passages and seat. Seat is covered by bellows valve. Space of pump-compressor pipes under nipple is connected by passages of crossing section unit with space of bellows chamber body. Space of pump-compressor pipes above nipple is connected with space below seat. Total effective area of cross-section of passages which connect space of pump-compressor pipes below nipple with space of bellows chamber body is larger than total effective area of cross-section of passages above nipple with space below seat. Aforesaid embodiment of device allows for maintaining required accuracy in keeping bottom-hole pressure at permanent value. EFFECT: higher efficiency. 3 dwg