초록 ▼

A locking mechanism for securing an inner member of a well assembly to the bore of a support or outer member has features that prevent any movement of the inner member due to a force acting along the axis of the bore. The locking mechanism includes a plurality of wicker grooves formed in a sidewall

A locking mechanism for securing an inner member of a well assembly to the bore of a support or outer member has features that prevent any movement of the inner member due to a force acting along the axis of the bore. The locking mechanism includes a plurality of wicker grooves formed in a sidewall of the bore transverse to the axis of the bore. Reacting grooves are formed on an outer wall of the inner member perpendicular to the axis of the bore. Slips are spaced around the outer wall of the inner member between the inner member and the sidewall of the bore. The slips each have wicker grooves on the exterior and reacting grooves on the interior. The locking mechanism includes an expansion device for moving the slips from the contracted position in which the wickers are nonengaging to an expanded position in which the wickers engage each other. The reacting grooves of the inner member each have an inclined surface facing generally outwardly and in the direction of the force. The force acting on the inner member causes the reacting grooves to transmit a resultant force to the slips to push more tightly against the bore.

대표청구항 ▼

In a well assembly having an outer member with an axial bore containing an upwardly facing shoulder, a hanger having a string of pipe secured to a lower end, an improved means for supporting the hanger in the outer member, comprising in combination: a plurality of annular wicker grooves formed in th

In a well assembly having an outer member with an axial bore containing an upwardly facing shoulder, a hanger having a string of pipe secured to a lower end, an improved means for supporting the hanger in the outer member, comprising in combination: a plurality of annular wicker grooves formed in the sidewall of the bore perpendicular to the axis of the bore; a plurality of reacting grooves formed in an outer wall of the hanger, each reacting groove extending at least partially around the circumference of the outer wall and perpendicular to the axis of the hanger; a plurality of slips spaced circumferentially apart from each other around the outer wall of the hanger, each slip having an outer wall with wicker grooves adapted to mate with the wicker grooves of the bore, and an inner wall containing reacting grooves that mate with the reacting grooves of the hanger; and expansion means for moving the slips between a contracted position in which a clearance exists between the wicker grooves of the bore and slips to an expanded position in which the wicker grooves of the bore and slips engage each other, the expansion means being actuated by contact with the shoulder and downward force applied to the hanger; the reacting grooves of the hanger each having an inclined surface facing downwardly and outwardly; the reacting grooves of the slips having oppositely facing inclined surfaces that engage the inclined surfaces of the hanger in both the contracted and expanded positions and slide outwardly with respect to the inclined surfaces of the hanger in the expanded position; in the expanded position, the force acting on the hanger being resisted by a reaction between the inclined surfaces, which directs an outward resultant force to the slips.