US4658901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for removing stuck well pipe
Assignee: Individual
•
Filing: 1985-09-03
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Granted: 1987-04-21
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Expires: 2005-09-03
Abstract
Abstract Stuck well pipe is removed from a well bore by applying an upward pull to the stuck pipe while applying an upward jarring action to the pipe by an air hammer which applies rapid blows to a linkage mechanism connected to the pipe.
Inventors
- 👤 Ivan D. Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:27
CPC Classifications
E; E21; E21B; E21B31/00; E21B31/107; E21B31/12; E21B31/18
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
69 words
The method of removing stuck well pipe from a well bore comprises: supporting a pulling tool on the top of an air hammer, connecting the tool to the pipe, operating the air hammer to apply at least one downwardly acting hammer blow to the tool, and converting the downwardly acting hammer force to an upward force applied to the stuck pipe while applying an upward pull to the hammer.
Claim 2
Independent Claim
69 words
The method of removing stuck well pipe from a well bore comprises: supporting a pulling tool on the top of an air hammer, connecting the tool to the pipe, operating the air hammer to apply at least one downwardly acting hammer blow to the tool, and converting the downwardly acting hammer force to an upward force applied to the stuck pipe while applying an upward pull to the hammer.
Claim 3
Dependent Claim
31 words
The method of claim 1, including lowering the hammer, collapsing the connection between said pulling tool and said stuck pipe and applying a downwardly acting hammer force to the stuck pipe.
Claim 4
Dependent Claim
21 words
The method of claim 1, including rotating the tool and air hammer to rotate the pipe while operating the air hammer.
Claim 5
Dependent Claim
85 words
Apparatus for removing stuck pipe from a well bore comprises: an elongated body structure having a shoulder to engage the upper end of an air hammer, force reversing means at the lower of said body structure, connecting means for connecting said force reversing means to a stuck pipe, and said force reversing means having portions engageable by said air hammer to impose an upward force on said connecting means in response to a downward force applied to said force reversing means by said air hammer.
Claim 6
Dependent Claim
85 words
Apparatus for removing stuck pipe from a well bore comprises: an elongated body structure having a shoulder to engage the upper end of an air hammer, force reversing means at the lower of said body structure, connecting means for connecting said force reversing means to a stuck pipe, and said force reversing means having portions engageable by said air hammer to impose an upward force on said connecting means in response to a downward force applied to said force reversing means by said air hammer.
Claim 7
Dependent Claim
23 words
Apparatus as defined in claim 4, said connecting means being vertically collapsible to permit application of downward hammer forces to said stuck pipe.
Claim 8
Dependent Claim
19 words
Apparatus as defined in claim 4, said connecting means including means engageable with the exterior of said stuck pipe.
Claim 9
Dependent Claim
19 words
Apparatus as defined in claim 4, said connecting means including means engageable with the interior of said stuck pipe.
Claim 10
Dependent Claim
22 words
Apparatus as defined in claim 4, said connecting means including means enabling the circulation of a flushing fluid through said connecting means.
Claim 11
Dependent Claim
22 words
Apparatus as defined in claim 4, including means for connecting said body structure to the air hammer for rotation as a unit.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-04-20 | 1990-10-20 | 1991-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-20 | 1994-10-20 | 1995-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-20 | 1998-10-20 | 1999-04-21 | $7700.00 | Window Closed / Lapsed |