Spiralling tapered slip-on drill string stabilizer

Details Spiralling tapered slip-on drill string stabilizer Spiralling tapered slip-on drill string stabilizer

E - Fixed Constructions

21

B

255/28

E21B 17/10 (2006.01) F16D 1/091 (2006.01) F16D 1/094 (2006.01)

Patent

CA 1259303

SPIRALLING TAPERED SLIP-ON DRILL STRING STABILIZER ABSTRACT The present invention includes a cylindrical or tubu- lar body member with a central bore which has two spiral- ling or threaded interior surfaces. Each spiralling or threaded interior surface has 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 from the upper end to the central portion has a left-hand spiralling or threaded surface. The lower portion of the body from the lower end to the central portion has a right-hand spiralling or threaded surface. The body member also defines a central bore which is large enough to accommodate a drill collar. 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 con- forms to the spiralling or threaded surface of the corre- sponding interior surface of the stabilizer body. The interior surface of each slip segment opposite a spiral- ling outer surface of the segment is serrated or otherwise configured to firmly engage a drill collar. In the event the stabilizer becomes stuck in the hole the stabilize- is capable of being further tightened onto the collar by a right-hand rotation, an up pull or a down push.

513140

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