BY-PASS SYSTEM OF OIL WELL PUMPING UNIT FOR DUAL PUMPING OF WELL HAVING AT LEAST TWO FORMATIONS, BY-PASS SYSTEM OF OIL WELL PUMPING UNIT FOR SINGLE AND MULTIPLE ZONE WELLS AND BY-PASSING METHOD FOR WELL SURVEY Russian patent published in 2013 - IPC F04B47/02 E21B47/00 

FIELD: oil and gas industry.

SUBSTANCE: by-pass system of oil well pumping unit for dual pumping of a well having at least two formations consists of Y-shaped unit installed at pipe string and pumping unit and string of bypass pipes with landing nipple for setting of removable blind plug are connected to the bottom part of this unit. Fishneck is located at setting of removable blind plug in the nipple in Y-shaped unit over the string of bypass pipes while the latter is fixed to the pumping unit by means of clams. Landing nipple is manufacture so that geophysical plug can be set in it instead of removable blind plug. In the well beneath by-pass system with pumping unit there are at least two packers of mechanical, hydromechanical or hydraulic action. Each packer is installed over respective well formation and at formation level between them there is at least one chamber with union or flow adjuster or stationary mandrel or pilot-controlled valve with hydraulic, electrical or mechanical actuation and ability to adjust flow passage with two positions of open and closed. Over the top packer there is pipe string disconnector at which adapter in disengaged status is installed. At the lower end of pipe string there is a blind plug or nipple-hopper. Besides geophysical plug can be set into landing nipple in by-pass of pumping unit instead of removable blind plug and nipple-hopper is fixed at the string of bypass pipes from the bottom. Upwards the latter the string of bypass pipes and pumping unit are interconnected by supporting structure. Telescopic sleeve is installed under the landing nipple at string of bypass pipes. Removable blind plug has sliding skirt in the upper part for pressure balancing and a tip in the lower part for wire or rope fixing. Bypassing method involves trip in hole of the tool at logging cable; the tool is installed at the logging cable with geophysical plug. Two hammers with frictional insert or inner surface with jagged notches are installed at the logging cable. The bottom hammer is installed 10-20 m higher then the tool. The top hammer is installed at bigger or equal distance from location point of geophysical plug in Y-shaped unit before the lower boundary of the surveyed formation. Geophysical plug is made with slide-off bushing in order to balance pressure.

EFFECT: improving operational reliability of downhole equipment during surveys of wells in production string downstream pumping unit due to accident-free removal of removable blind plug and geophysical plug in surveying process.

5 cl, 9 dwg