IP Library › Granted Patent US 12662891

Granted Patent B2

US 12662891 · App. 18/481,644 · Granted Jun 23, 2026

Downhole tool including a locking dog

Inventors: Lars Petter Larsen (Stavanger, NO); Borisa Lajesic (Stavanger, NO); Morten Falnes (Stavanger, NO); Vegard Dyrseth (Stavanger, NO)

Assignee: Halliburton Energy Services, Inc.

E21B23/02 E21B7/061 E21B17/046 E21B17/0465 E21B23/01 E21B23/03 E21B23/06 E21B33/12 E21B41/0035 E21B47/00

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Quick Facts

Patent No.: US 12662891
App. No.: 18/481,644
Granted: Jun 23, 2026
Kind: B2

External Links

USPTO Patent Center↗ Full Patent PDF↗

Abstract

Provided is a downhole tool, a well system, and a method for forming a well system. The downhole tool, in one aspect, includes a latch collet including a collet body, the collet body having a collet body slot on a radial interior surface thereof and a plurality of collet fingers, as well as a mandrel positioned within the collet body, the mandrel having a mandrel opening extending through a thickness (t m ) thereof, and a running tool collet located within the mandrel, the running tool collet having a running tool collet slot on a radial exterior surface thereof. The downhole tool, according to this aspect, further includes a locking dog positioned within the mandrel opening.

Claims (52)

1 . A downhole tool, comprising:

a latch collet including a collet body, the collet body having a collet body slot on a radial interior surface thereof and a plurality of collet fingers;

a mandrel positioned within the collet body, the mandrel having a mandrel opening extending through a thickness (t m ) thereof;

a running tool collet located within the mandrel, the running tool collet having a running tool collet slot on a radial exterior surface thereof; and

a locking dog positioned within the mandrel opening, the locking dog configured to engage with the running tool collet slot when the downhole tool is in a run-in-hole state and thereby prevent the mandrel and the running tool collet from sliding relative to one another and configured to disengage from the running tool collet slot and engage with the collet body slot after the collet body and the mandrel have slid relative to one another and thereby allow the mandrel and the running tool collet to slide relative to one another, wherein the collet body is configured to keep the locking dog engaged with the running tool collet slot when the downhole tool is in the run-in-hole state, and further wherein the running tool collet is configured to keep the locking dog engaged with the collet body slot after the collet body and the mandrel have slid relative to one another.

2 . The downhole tool as recited in claim 1 , wherein the running tool collet slot has a collet slot downhole edge and a collet slot uphole edge, and further wherein the collet slot downhole edge has a collet slot angled ramp profile.

3 . The downhole tool as recited in claim 2 , wherein the collet slot angled ramp profile is a first collet slot angled ramp profile, and further wherein the collet slot uphole edge has a second collet slot angled ramp profile.

4 . The downhole tool as recited in claim 3 , wherein the locking dog has a locking dog downhole edge and a locking dog uphole edge, and further wherein a radially interior portion of the locking dog downhole edge has locking dog angled ramp profile.

5 . The downhole tool as recited in claim 4 , wherein locking dog angled ramp profile is a first locking dog angled ramp profile, and further wherein a radially interior portion of the locking dog uphole edge has second locking dog angled ramp profile, the first and second collet slot angled ramp profiles and first and second locking dog angled ramp profiles configured to cooperate to force the locking dog into the collet body slot.

6 . The downhole tool as recited in claim 1 , further including a bore sensor located in the collet body between the locking dog and a shear feature.

7 . The downhole tool as recited in claim 1 , further including first and second seal grooves located in the collet body and on opposing sides of the collet body slot.

8 . The downhole tool as recited in claim 7 , further including first and second seal members located in the first and second seal grooves.

9 . A well system, comprising:

a wellbore extending through one or more subterranean formations;

wellbore casing located in the wellbore, the wellbore casing including a latch coupling; and

a downhole tool located in the wellbore and configured to engage with the latch coupling, the downhole tool including:

a latch collet including a collet body, the collet body having a collet body slot on a radial interior surface thereof and a plurality of collet fingers;

a mandrel positioned within the collet body, the mandrel having a mandrel opening extending through a thickness (t m ) thereof;

a running tool collet located within the mandrel, the running tool collet having a running tool collet slot on a radial exterior surface thereof; and

10 . The well system as recited in claim 9 , wherein the running tool collet slot has a collet slot downhole edge and a collet slot uphole edge, and further wherein the collet slot downhole edge has a collet slot angled ramp profile.

11 . The well system as recited in claim 10 , wherein the collet slot angled ramp profile is a first collet slot angled ramp profile, and further wherein the collet slot uphole edge has a second collet slot angled ramp profile.

12 . The well system as recited in claim 11 , wherein the locking dog has a locking dog downhole edge and a locking dog uphole edge, and further wherein a radially interior portion of the locking dog downhole edge has locking dog angled ramp profile.

13 . The well system as recited in claim 12 , wherein locking dog angled ramp profile is a first locking dog angled ramp profile, and further wherein a radially interior portion of the locking dog uphole edge has second locking dog angled ramp profile, the first and second collet slot angled ramp profiles and first and second locking dog angled ramp profiles configured to cooperate to force the locking dog into the collet body slot.

14 . The well system as recited in claim 9 , further including a bore sensor located in the collet body between the locking dog and a shear feature.

15 . The well system as recited in claim 9 , further including first and second seal grooves located in the collet body and on opposing sides of the collet body slot.

16 . The well system as recited in claim 15 , further including first and second seal members located in the first and second seal grooves.

17 . A method for forming a well system, comprising:

forming a wellbore through one or more subterranean formations;

positioning wellbore casing in the wellbore, the wellbore casing including a latch coupling; and

positioning a downhole tool in the wellbore, the downhole tool configured to engage with the latch coupling, the downhole tool including:

a latch collet including a collet body, the collet body having a collet body slot on a radial interior surface thereof and a plurality of collet fingers;

a mandrel positioned within the collet body, the mandrel having a mandrel opening extending through a thickness (t m ) thereof;

a running tool collet located within the mandrel, the running tool collet having a running tool collet slot on a radial exterior surface thereof; and

18 . A downhole tool, comprising:

a latch collet including a collet body, the collet body having a collet body slot on a radial interior surface thereof and a plurality of collet fingers;

a mandrel positioned within the collet body, the mandrel having a mandrel opening extending through a thickness (t m ) thereof;

a running tool collet located within the mandrel, the running tool collet having a running tool collet slot on a radial exterior surface thereof; and

a locking dog positioned within the mandrel opening, the locking dog configured to engage with the running tool collet slot when the downhole tool is in a run-in-hole state and thereby prevent the mandrel and the running tool collet from sliding relative to one another and configured to disengage from the running tool collet slot and engage with the collet body slot after the collet body and the mandrel have slid relative to one another and thereby allow the mandrel and the running tool collet to slide relative to one another, wherein the running tool collet slot has a collet slot downhole edge and a collet slot uphole edge, and further wherein the collet slot downhole edge has a collet slot angled ramp profile.

19 . A downhole tool, comprising:

a latch collet including a collet body, the collet body having a collet body slot on a radial interior surface thereof and a plurality of collet fingers;

a mandrel positioned within the collet body, the mandrel having a mandrel opening extending through a thickness (t m ) thereof;

a running tool collet located within the mandrel, the running tool collet having a running tool collet slot on a radial exterior surface thereof;

a bore sensor located in the collet body between the locking dog and a shear feature.

20 . A downhole tool, comprising:

a latch collet including a collet body, the collet body having a collet body slot on a radial interior surface thereof and a plurality of collet fingers;

a mandrel positioned within the collet body, the mandrel having a mandrel opening extending through a thickness (t m ) thereof;

a running tool collet located within the mandrel, the running tool collet having a running tool collet slot on a radial exterior surface thereof;

first and second seal grooves located in the collet body and on opposing sides of the collet body slot.