Retractable landing shoulder for downhole devices
AssigneeOtis Engineering Corporation
InventorGeorge M. Raulins
Life of this patent
Estimating the term…
Abstract
A selective down-hole tool landing shoulder employing a housing with sliding internal sleeve member positionable between first and second detented positions within the housing. Resilient collet members, depending from the sleeve, carry radially inwardly extending bosses which define a full-bore opening with the sleeve in one position, and which are forced radially inwardly by camming action to define a restrictive bore as the sleeve is positioned to the second position.
Claims11
A selectively functionable downhole tool rest device comprising an annular housing means having a longitudinal bore therethrough for passage of fluids and tools, and inner sleeve member slideably received in said housing means;
- co-active detent means carried by said sleeve member and housing means and defining first and second resiliently detented longitudinal positions of said sleeve member within said housing means;
- a plurality of circumferentially disposed resilient collet finger members depending from an upper section of said sleeve member and extending longitudinally therefrom;
- a plurality of radially inward extending bosses carried individually on the respective free-end extremes of said collet members;
- said sleeve member having inside diameter defining extremes defining a bore equal that of the longitudinal end-extreme bore of said housing means with the radially inward extremes of said collet-carried bosses defining said housing means longitudinal extreme end bore with said sleeve member in a first detented longitudinal position;
- said housing means being formed with a bore transition with which camming surface means on the longitudinal end-extremes of said bosses engage to urge said bosses radially inwardly upon said sleeve member being positioned to said second detented longitudinal position at which the radially inward extremes of said bosses define a bore less than that of said housing longitudinal end-extreme bore.
In a tubular housing threadedly connectable to a pipe string, internal shoulder means on resilient collet arm extensions from a sleeve member movable radially inwardly and outwardly between inward restrictive bore opening and outward full-bore opening positions;
- and collet arm extension shoulder positioning cam means in said tubular housing for camming said collet arm extensions between the radially outward and inward positions, using primarily straight longitudinal movement of the sleeve member, with the resilient collet arm extensions, through a camming range of movement.
Dependencies are inferred from the claim text.