SLIP Russian patent published in 2005 - IPC

FIELD: oil production equipment, particularly means for performing tripping processes under increased pressure, for thawing frozen wells and hydrate blocks inside wells.

SUBSTANCE: slip comprises body with conical boring in upper part thereof. Arranged in the boring are wedges having grooves in upper outer parts thereof. Ring-like tensioning springs are located in wedge grooves. Borings are formed in upper inner wedge parts opposite to the grooves.

EFFECT: increased reliability of automatic pipe gripping during pushing thereof out of well, reduced idle time for wedge change or cleaning, increased service life of the wedges.

2 dwg