Claims
- 1. A system for securing a tieback hanger to a casing section, comprising:a casing section including a window opening formed therethrough; the window opening defining a first profiled area and a second profiled area; a tieback hanger having a first end and a second end; the first end including a first setting tab and a second setting tab; and the first setting tab adapted to releasably engage the first profiled area and the second setting tab adapted to releasably engage the second profiled area; wherein the tieback hanger extends through the casing window and engages to the casing section when the first setting tab is engaged to the first profiled area and the second setting tab is engaged to the second profiled area.
- 2. The system of claim 1, wherein:the window opening includes a bottom and a top; the first profiled area is formed adjacent the bottom of the window opening; and the second profiled area is formed adjacent the top of the window opening.
- 3. The system of claim 1, wherein:the window opening includes an edge; and the first and second profiled areas are formed to taper gradually toward their respective edges thereby forming a beveled edge.
- 4. The system of claim 1, wherein the first and second setting tabs are formed to flare outwardly from the casing section.
- 5. The system of claim 1, wherein:the first setting tab forms a tapering dovetail configuration; the first profiled area forms a tapering dovetail mortise; and the dovetail configuration enables the wedging engagement of the first setting tab and the first profiled area.
- 6. The system of claim 1, wherein:the second setting tab forms a dovetail configuration; the second profiled area forms a dovetail mortise; and the dovetail configuration enables the wedging engagement of the second setting tab and the second profiled area.
- 7. The system of claim 1, wherein the second setting tab snaps into engagement with the second profiled area.
- 8. The system of claim 7, wherein the second profiled area includes a recess that receives an extension of the second setting tab once the second setting tab is snapped therein.
- 9. The system of claim 8, wherein the extension includes trailing edges that are chamfered to facilitate unsnapping of the second setting tab from the second profiled area.
- 10. The system of claim 1, wherein the width of the second setting tab is slightly greater than the width of the second profiled area.
- 11. The system of claim 1, wherein:the tieback hanger further includes a plurality of flanges; and the plurality of flanges are adapted to abut against the casing section when the first setting tab is engaged to the first profiled area.
- 12. The system of claim 1, wherein the engagement of the first setting tab and first profiled area and the engagement of the second setting tab and second profiled area are adapted to prevent the inward and outward movement of the tieback hanger in relation to the casing section.
- 13. A method of securing a tieback hanger to a casing section, comprising:locating the casing section in the appropriate location in the wellbore; sliding the tieback hanger at least partially through a window opening defined in the casing section; engaging a first setting tab of the tieback hanger to a first profiled area of the window opening; and engaging a second setting tab of the tieback hanger to a second profiled area of the window opening.
- 14. The method of claim 13, wherein the first setting tab engagement step comprises wedging the first setting tab with the first profiled area.
- 15. The method of claim 13, wherein the second setting tab engagement step comprises wedging the second setting tab with the second profiled area.
- 16. The method of claim 13, wherein the second setting tab engagement step comprises snapping the second setting tab into engagement with the second profiled area.
- 17. The method of claim 16, wherein the snapping step comprises snapping an extension of the second setting tab into a recess defined on the second profiled area.
- 18. The method of claim 17, wherein the second setting tab is disengaged from the second profiled area by unsnapping the extension from the recess.
- 19. The method of claim 13, further comprising after the engagement steps, disengaging the second setting tab from the second profiled area.
- 20. The method of claim 13, further comprising locating a plurality of flanges of the tieback hanger against the casing section when the first setting tab is engaged to the first profiled area.
- 21. The method of claim 13, wherein the engagement steps comprise preventing the inward and outward movement of the tieback hanger in relation to the casing section.
- 22. A system for tieing back a liner from a wellbore casing, comprising:a wellbore casing including a window opening formed therethrough; the window opening defined by edges extending between the outer surface of the casing and the inner surface of the casing; the edges including beveled portions formed such that an acute angle is formed at the intersection of the edges and the outer surface of the casing; a tieback hanger having an outboard end onto which a liner is attachable and an anchored end for attachment to the casing when the outboard end has been inserted through the window opening of the casing; and the outboard end having thereon a flared tab for engaging against the beveled portions of the window opening edges.
- 23. The system of claim 22, wherein the beveled portions of the window opening are positioned on opposite sides of the window opening such that a dovetail mortise is formed therebetween and the flared tab is dovetailed to wedge into the dovetail mortise formed between the beveled portions.
- 24. The system of claim 22, wherein the edges of the window opening and the anchored end of the tieback hanger can be formed to snappingly engage with each other to prevent the tieback hanger from both passing outwardly through the window opening and moving back into the casing, once the parts are engaged together.
- 25. The system of claim 22, wherein the flared tabs are sized such that when they are engaged against the beveled portions, they substantially do not extend inwardly past the inner surface of the casing.
- 26. A system for securing a tieback hanger to a casing section, comprising:a casing string including a casing section, the casing section including a window opening formed therethrough and having an interior surface; at least one profiled area formed in the interior surface of the casing section; a tieback hanger having at least one projection; and the at least one projection adapted to releasably engage the at least one profiled area; wherein the tieback hanger extends through the casing window and engages to the casing section when the at least one projection is engaged to the at least one profiled area.
- 27. The system of claim 26, wherein the at least one profiled area is formed to taper gradually toward its respective edges thereby forming a beveled edge.
- 28. The system of claim 26, wherein the at least one projection is formed to flare outwardly from the casing section.
- 29. The system of claim 26, wherein:the at least one projection forms a tapering dovetail configuration; the at least one profiled area forms a tapering dovetail mortise; and the dovetail configuration enables the wedging engagement of the at least one projection and the at least one profiled area.
- 30. The system of claim 26, wherein the at least one projection comprises at least one tab.
- 31. The system of claim 26, wherein the at least one profile forms a recessed region in the interior surface.
- 32. The system of claim 31, wherein the at least one profile is adapted to cause the at least one projection to be substantially flush with the region of the interior surface outside of the recessed region when the at least one projection is engaged to the at least one profiled area.
Priority Claims (2)
Number |
Date |
Country |
Kind |
2236047 |
Apr 1998 |
CA |
|
2245342 |
Aug 1998 |
CA |
|
Parent Case Info
This application is a continuation of U.S. application Ser. No. 09/305,775 filed on Apr. 16, 1999, now U.S. Pat. No. 6,283,208, which is a continuation-in-part of U.S. application Ser. No. 08/923,945 filed on Sep. 5, 1997, now U.S. Pat. No. 6,012,516. The '775 Application also claims the benefit of Canadian Patent Application No. 2,236,047, filed on Apr. 27, 1998, and Canadian Patent Application No. 2,245,342, filed on Aug. 18, 1998.
US Referenced Citations (19)
Continuations (1)
|
Number |
Date |
Country |
Parent |
09/305775 |
Apr 1999 |
US |
Child |
09/883010 |
|
US |
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
08/923945 |
Sep 1997 |
US |
Child |
09/305775 |
|
US |