STABILISATOR, AUFSETZBAR AUF EIN BOHRGESTAENGE MIT SPIRALFOERMIGEN KEILEN.

摘要

The present invention includes a tubular body member with a central bore which has two spiralling or threaded interior surfaces, each interior surface having a leading edge at nearly right angles to the longitudinal axis of the body and a sloped or tapered trailing edge along the bore from an end portion toward the central portion of the bore. The upper portion of the body has a left-hand spiralling or threaded surface. The lower portion of the body has a right-hand spiralling or threaded surface. Inserted into the central portion of the body member from each end is a slip segment or member. The outer surface of the upper slip segment has a left-hand spiralling or threaded surface, whereas the outer surface of the lower slip segment has a right-hand spiralling or threaded surface. Each such spiralling or threaded surface conforms to the spiralling or threaded surface of the corresponding interior surface of the stabilizer body. The interior surface of each slip segment opposite a spiralling outer surface of the segment is serrated to firmly engage a drill collar. In the event the stabilizer becomes stuck in the hole the stabilizer is capable of being further tightened onto the collar by a right-hand rotation, an up pull or a down push.