Self-aligning well tool guide
AssigneeOtis Engineering Corporation
InventorsHenry L. Restarick, John R. Setterberg, Jr.
Life of this patent
Estimating the term…
Abstract
A device for guiding the lower end of a pipe string, or the like, past an upwardly facing shoulder in a well in which rotation of the pipe string is prohibited. When the guiding device lodges on such shoulder, the pipe string is lifted and lowered a few times, this reciprocating action actuating an indexing mechanism in the guide tool and causing the lower end of the guide tool to rotate so that a slanted guide surface thereon is brought around to the point of lodging to dislodge the guide tool from the shoulder and guide the pipe string therepast.
Claims10
A tool guide, comprising:
- a. a tubular body having means on its upper end for attachment to a tool string;
- b. a guide member having its upper end telescopingly engaged with said tubular body and reciprocable relative thereto, said guide member having an inclined guide surface at its lower end;
- c. coengageable means on said tubular body and said guide member for indexing said guide member about its longitudinal axis in response to reciprocal movement between said body and said guide member;
- d. means biasing said guide member toward extended position;
- and
- e. means on said body and said guide member limiting longitudinal movement between said body and said guide member.
A tool guide, comprising:
- a. a first tubular body member having means on its upper end for attachment to a tool string, the lower portion of said first tubular body member being reduced in outside diameter and providing a downwardly facing shoulder intermediate its ends;
- b. a second tubular body member having an annular zig-zag operating slot formed in its exterior surface, the walls of said operating slot providing cam surfaces, the upper portion of the bore of said second tubular member being enlarged and providing an internal upwardly facing shoulder intermediate its ends, said second body member adapted to receive the lower reduced diameter portion of said first body member in its enlarged bore;
- c. shear pin means disposed in aligned apertures formed in the walls of the first and second body members to secure the same together, said shear pin means being adapted to release said body members from each other in response to a predetermined tensile load;
- d. a ring slidably mounted on the reduced diameter portion of said first body member, downward movement of said ring being limited by engagement of said ring with the upper end of said second body member;
- e. spring means on said first body member having one end engaged with said downwardly facing shoulder thereon and its other end engaged with said ring;
- f. a guide member having a slanted guide surface at its lower end, said guide member being telescoped over said second body member and having at least one pin projecting inwardly and engaged in said operating slot of said second body member, the upper end of said guide member being engageable with said ring, said guide member having an internal upwardly facing shoulder normally spaced from the lower end of said second body member and being engageable therewith to limit upward movement of said guide member relative to said body, said spring biasing said guide member downwardly, said pin advancing along said operating slot to rotate said guide member relative to said body as a result of said guide member being reciprocated relative thereto.
Dependencies are inferred from the claim text.