EMPTYING DEVICE Russian patent published in 2002 - IPC

FIELD: oil-producing industry, particularly, devices for discharge of fluid from tubing string in well remedial work. SUBSTANCE: emptying device includes tubing pipes, well pump, slip unit with slip holder, spring-loaded slips and wedging member. There is a hollow barrel with step external surface and longitudinal recesses interconnected by sector hollow, and unit for opening of discharge hole. Said unit is made in the form of branch pipe with external shoulder in middle part. Freely fitted on it is nipple with internal shoulder in upper part and sub-coupling which is installed on barrel upper end and connected with branch pipe by means of threaded joint with left-hand thread. Nipple and sub-coupling are connected by means of coupling with discharge hole in central part. Wedging member is made in the form of cone fitted on a barrel. EFFECT: higher operating reliability of device in lowering of equipment. 2 dwg