FIELD: oil-and-gas industry.
SUBSTANCE: invention relates to oil and gas production, particularly, to devices intended for locking external tooling on string run in the well. Proposed device comprises ring-like bush with inner grooves to receive appropriate locking element composed of one-sided wedge with locking triangular ledges facing the pipe, perpendicular to its axis. Said bush is rigidly coupled with well equipment while said grooves are arranged in lengthwise direction of said bush and regularly spaced apart in circle with inclined surface complying with wedge angle and directed downward, toward bush axis. The number of said wedges equal that of grooves. Wedge bottom has elastostrained stem with retainer on outer side. Annular grooves to receive wedge retainer are made at bush, right under said grooves.
EFFECT: higher reliability.
2 dwg
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