Downhole apparatus
AssigneeDeltatek Oil Tools Limited
InventorsTristam Paul Horn, Stephen Edmund Bruce, David Michael Shand, Tyler Rhes Reynolds
Life of this patent
Estimating the term…
Abstract
A coupling connects an inner string to a lower end of a bore-lining tubing, such as a liner. The coupling includes a catcher and may be provided in combination with at least one member for translating through the inner string and landing in the catcher. The member may be an occluding member, such as a ball for occluding a flow passage through the coupling.
Claims29
A downhole coupling for connecting a lower end of an inner string to a lower end of a bore-lining tubing, the coupling being adapted for mounting in the lower end of the bore-lining tubing and for engaging the lower end of the inner string, and the coupling including a catcher,
- wherein the coupling is configurable to permit separation of the lower end of the inner string from the lower end of the bore-lining tubing, wherein the inner string is retrievable from a bore while the bore-lining tubing, the coupling and the catcher remain in the bore;
- wherein the coupling is in combination with at least one member for translating through the inner string and landing in the catcher.
2-3. (canceled)
The coupling of claim 31, wherein the at least one member is an occluding member for occluding a flow passage through the coupling, and
- wherein the coupling includes a seat for cooperating with an occluding member, and wherein the occluding member is displaceable to the catcher.
(canceled)
8-12. (canceled)
14-15. (canceled)
A downhole method comprising:
- (a) coupling a lower end of an inner string to a lower end of a borelining tubing to form a tubing assembly;
- then
- (b) translating at least one member through the inner string to a catcher in the lower end of the bore-lining tubing, and then
- (c) flowing fluid through the inner string and out of the bore-lining tubing.
The method of claim 22, further comprising:
- pressurizing the inner string above the occluding location to activate a tubing hanger to secure an upper end of the bore-lining tubing to previously installed tubing;
- and
- translating the occluding member from the occluding location and reinstating flow through the tubing assembly;
- wherein the occluding location is located towards the lower end of the tubing assembly;
- further comprising one of:
- displacing the occluding member through a seat and displacing the occluding member and a seat.
24-26. (canceled)
28-29. (canceled)
31-33. (canceled)
-38. (canceled)
40-42. (canceled)
The method of claim 40, further comprising uncoupling the lower end of the inner string from the lower end of the bore-lining tubing and retrieving the inner string from the bore while the wiper plug and the borelining tubing remain in the bore.
46-60. (canceled)
Dependencies are inferred from the claim text.