FIELD: oil production. SUBSTANCE: packer has ball retainers and flexible ring. Upper cone has groove on outer generator and channels for ball retainers and flexible ring. In this case, packer mandrel above upper cone has shoulder with outer diameter smaller then inner diameter of upper cone. Ball retainers are installed for inter-action with mandrel and flexible ring. Locking members are made in form of spring-loaded balls. In point of contact of upper cone and slips, channels are made, respectively, for locking members and grooves for their balls. EFFECT: improved operate reliability of packer due to decreased tension of pipe string when temperature and pressure vary. 1 dwg
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