PACKER Russian patent published in 1996 - IPC

FIELD: mining industry, sealing of drill string-borehole annulus in oil and gas wells. SUBSTANCE: packer has body 1 with sealing member 2, sleeve 3, end piece 5, powder charge 6 with electric initiating unit and stop unit. External surface of end piece 5 has annular recess forming with sleeve 3 the airtight chamber filled with labelling substance 11. Packer is lowered into well on the pipe string. Using radiation logging instrument lowered on a cable into pipe string, background diagram is taken on which position of labelling substance 11 in packer is fixed. Then, cable inductor is lowered and packer electric initiating unit is actuated. Under the action of pressure of powder gases of charge 6, sleeve 3 compresses sealing member 2 and opens airtight chimaera with labelling substance 11 which is mixed with well mud In this case, stop unit keeps sealing member is compressed position. In case of unreliable packing, labelling substance appears on the other side of sealing member whose presence is registered on the diagram when the radiation logging instrument is lowered again in the well, that is indicative of the packer service conditions. EFFECT: higher reliability in checking the packing tightness.