IP Library › Granted Patent US 12687089
Granted Patent B1
US 12687089 · App. 19/387,987 · Granted Jul 21, 2026

Downhole tool safety catch

Inventors: Chad Feddema (Conroe, TX); Sheldon Ritchie (Conroe, TX)
Assignee: TURBO DRILL INDUSTRIES, INC.
E21B40/001
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Quick Facts
Patent No.
US 12687089
App. No.
19/387,987
Granted
Jul 21, 2026
Kind
B1
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.

Claims (32)

1 . 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.

2 . The downhole catch assembly of claim 1 , wherein the catch stem is coupled to a mandrel of a stroker tool.

3 . The downhole catch assembly of claim 1 , wherein the catch stem rotates with rotor rotation from a power section of a bottom hole assembly.

4 . The downhole catch assembly of claim 1 , wherein the installation bore is angled between 4 degrees and 15 degrees relative to the longitudinal central axis.

5 . The downhole catch assembly of claim 1 , wherein the landing ledge is located inside a pin of the catcher sub with the pin configured for coupling to a box of a tubular outer housing surrounding part of the catch stem extending from the catcher sub.

6 . The downhole catch assembly of claim 1 , wherein the landing ledge is located above a pin of the catcher sub with the pin configured for coupling to a box of a tubular outer housing.

7 . The downhole catch assembly of claim 1 , wherein the catch stem is coupled to move with rotor rotation from a power section of a bottom hole assembly and an enlarged internal bore of the catcher sub above the upper axial bore face accommodates the radial protrusion of the catch stem throughout eccentric motion of the rotor rotation.

8 . The downhole catch assembly of claim 1 , wherein central and annular flow paths extend through the downhole catch assembly in a normal operating position, and the annular flow path is blocked in the landed position.

9 . The downhole catch assembly of claim 1 , wherein the upper and lower axial bore faces are partial cylinders on opposite sides of the catcher sub dimensioned for tight concentric clearance fit with the radial protrusion in the landed position.

10 . The downhole catch assembly of claim 1 , wherein the installation bore is angled at least 4 degrees relative to the longitudinal central axis and has an inside diameter within the catcher sub at least as large as an outside diameter of the radial protrusion on the catch stem.

11 . 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.

12 . The method of claim 11 , further comprising running the catcher sub within a drill string into a wellbore with the catch stem coupled to a mandrel of a stroker tool.

13 . The method of claim 11 , further comprising rotating the catch stem with rotor rotation from a power section of a bottom hole assembly.

14 . The method of claim 11 , wherein the installation bore is angled between 4 degrees and 15 degrees relative to the longitudinal central axis.

15 . The method of claim 11 , wherein the landing ledge is located inside a pin of the catcher sub with the coupling mating the pin to a box of the tubular outer housing.

16 . The method of claim 11 , wherein the landing ledge is located above a pin of the catcher sub with the coupling mating the pin to a box of the tubular outer housing.

17 . The method of claim 11 , further comprising moving the catch stem with rotor rotation from a power section of a bottom hole assembly and accommodating the radial protrusion of the catch stem throughout eccentric motion of the rotor rotation within an enlarged internal bore of the catcher sub.

18 . The method of claim 11 , further comprising passing fluid through central and annular flow paths extending through the downhole catch assembly and detecting an increase in pressure when the annular flow path is blocked by movement of the catch stem to a landed position due to a downhole separation.

19 . The method of claim 11 , wherein the catcher sub includes upper and lower axial bore faces aligned with the longitudinal central axis and formed inside of the catcher sub above the landing ledge to facilitate in keeping the catch stem engaged with the landing ledge after movement of the catch stem to a landed position due to a downhole separation.

20 . The method of claim 11 , wherein the installation bore is angled at least 4 degrees relative to the longitudinal central axis and has an inside diameter within the catcher sub at least as large as an outside diameter of the radial protrusion on the catch stem.