Downhole tool safety catch
AssigneeTurbo Drill Industries, Inc.
InventorsChad Feddema, Sheldon Ritchie
Life of this patent
Estimating the term…
Abstract
A downhole catch assembly includes a catch stem having a radial protrusion to provide a landing shoulder and a catcher sub having a longitudinal central axis and the radial protrusion of the catch stem located within the catcher sub. A landing ledge extends radially inward inside the catcher sub for engagement with the landing shoulder of the catch stem. An installation bore angled relative to the longitudinal central axis enters a bottom terminus of the catcher sub offset relative to radial center of the catcher sub. The installation bore extends into the catcher sub above the landing ledge to facilitate installing the catch stem into the catcher sub.
Claims20
A downhole catch assembly, comprising:
- a catch stem having a radial protrusion to provide a landing shoulder;
- and
- a catcher sub having a longitudinal central axis and the radial protrusion of the catch stem located within the catcher sub, wherein:
- a landing ledge extends radially inward inside the catcher sub for engagement with the landing shoulder of the catch stem in a landed position;
- upper and lower axial bore faces align with the longitudinal central axis and are formed inside of the catcher sub above the landing ledge;
- an installation bore angled relative to the longitudinal central axis enters a bottom terminus of the catcher sub offset relative to radial center of the catcher sub;
- and
- the installation bore extends into the catcher sub to intersect between the upper and lower axial bore faces, wherein the radial protrusion of the catch stem is nested in both the upper and lower axial bore faces in the landed position and the radial protrusion of the catch stem is insertable through the installation bore into the bottom terminus of the catcher sub without engagement with the landing ledge when installing the catch stem into the catcher sub.
A method of using a downhole catch assembly, comprising:
- providing a catcher sub having a longitudinal central axis and a landing ledge extending radially inward inside the catcher sub;
- providing a catch stem having a radial protrusion forming a landing shoulder for engagement with the landing ledge within the catcher sub;
- aligning the catch stem with an installation bore angled relative to the longitudinal central axis and entering a bottom terminus of the catcher sub offset relative to radial center of the catcher sub;
- inserting the radial protrusion of the catch stem through the installation bore of the catcher sub and above the landing ledge without engagement of the radial protrusion with the landing ledge while the catch stem is aligned with the installation bore of the catcher sub;
- aligning the catcher sub with a tubular outer housing surrounding the catch stem once the radial protrusion of the catch stem is inserted above the landing ledge, wherein the catch stem is then angled such that the landing shoulder and the landing ledge are aligned for engagement with each other;
- and
- coupling the catcher sub and the tubular outer housing together while aligned with each other.
Dependencies are inferred from the claim text.