Liner hanger slip retention system and method
A technique facilitates deploying and setting a liner hanger assembly while securely retaining liner hanger slips during running-in-hole. The liner hanger assembly may comprise a variety of components such as a mandrel, a cone, a plurality of slips, a retention ring, and an actuator. The slips may each be configured with an upper retention end and a lower retention end having a plurality of angles which interlock with corresponding angles of the cone and the retention ring. Additionally, a portion of the actuator may be sized to slide over an axial end of the retention ring to prevent inadvertent decoupling of the slips after installing the slips along the exterior of the cone.
1. A system for use in a well, comprising:
a liner hanger comprising:
a mandrel;
a cone mounted about the mandrel, the cone having tapered slots;
a plurality of tapered slips slidably received in the tapered slots, each tapered slip having a retention end with a plurality of slip retention fingers, each slip retention finger having angled surfaces oriented at a plurality of differing angles;
a retention ring having a plurality of ring retention fingers which slidably engage the slip retention fingers, the plurality of ring retention fingers including a first ring retention finger engaged with first and second slip retention fingers of a first slip of the plurality of tapered slips, the plurality of ring retention fingers further including a second ring retention finger engaged with the first slip retention finger of the first slip and with a first slip retention finger of a second slip of the plurality of tapered slips, each ring retention finger having corresponding angled surfaces, the corresponding angled surfaces being arranged to engage the angled surfaces of the slip retention fingers, the angled surfaces of the ring retention fingers and the angled surfaces of the slip retention fingers extend outwardly from each other forming mating V-angle surfaces in a manner which prevents release of the plurality of tapered slips from the retention ring during deployment of the liner hanger; and
an actuator mounted about the mandrel to selectively shift the plurality of tapered slips between a radially contracted position and a radially expanded, set position.
2. The system as recited in claim 1 , wherein each tapered slip is wider, in a circumferential direction, at a lower end than at an upper end.
3. The system as recited in claim 2 , wherein each tapered slip comprises a hammerhead located at the upper end, the hammerhead having sloped surfaces arranged to slidably capture the hammerhead in an upper region of the corresponding tapered slot.
4. The system as recited in claim 1 , wherein the ring retention fingers of the retention ring have differing axial lengths.
5. The system as recited in claim 1 , wherein the actuator comprises a hydraulically actuated cylinder which overlaps the retention ring in a manner preventing decoupling of the plurality of tapered slips.
6. The system as recited in claim 5 , wherein the hydraulically actuated cylinder comprises a face which moves against the tapered slips and forces the tapered slips in an axial direction during setting of the plurality of tapered slips.
7. The system as recited in claim 1 , wherein the cone is configured to enable installation of the plurality of tapered slips from the exterior of the cone.
8. A method, comprising:
providing a cone of a liner hanger with slots for receiving slips;
trapping an upper end of each slip in an upper portion of the corresponding slot, wherein trapping comprises forming the upper end as a flared hammerhead which is trapped under corresponding sloped surfaces of the cone;
retaining a lower end of each slip against unwanted release from the cone by a retention ring having a plurality of ring retention fingers which slidably engage corresponding slip retention fingers of each slip, the plurality of ring retention fingers including a first ring retention finger engaged with first and second slip retention fingers of a first slip, the plurality of ring retention fingers further including a second ring retention finger engaged with the first slip retention finger of the first slip and with a first slip retention finger of a second slip; and
further securing the slips against release by blocking disassembly via a hydraulic cylinder used for setting the liner hanger.
9. The method as recited in claim 8 , wherein retaining comprises using cooperating angled surfaces of the slip retention fingers and the ring retention fingers to prevent each slip from releasing from the cone in a radially outward direction.
10. The method as recited in claim 9 , wherein securing comprises using the hydraulic cylinder to block the slips against undue movement in an axial direction, thus ensuring the slips remain held in place by the cooperating angled surfaces.
11. The method as recited in claim 9 , wherein the cooperating angled surfaces form mating V-angle surfaces.