PACKER Russian patent published in 1994 - IPC

FIELD: oil and gas production. SUBSTANCE: for tight setting and shutting of borehole with fixing of sealing member in compressed position and removal of compressing load arm of sealing member locating it with respect to borehole is manufactured in the form of collet bushing made fast to adapter with the aid of inner protrusion and interacting with inner protrusion of body. Ratchet teeth over outer surface of borehole are fabricated in the form of left-hand thread. Working sections of ratchet teeth of borehole are separated with smooth surface. Its length over generating line of borehole is bigger than spline of inlet branch pipe which gives possibility for spline joint to move into mesh only after complete release of ratchet teeth. EFFECT: enhanced operational capabilities of packer. 2 dwg