US3645328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Retrieving tool and method
Assignee: Individual
•
Filing: 1970-06-22
•
Granted: 1972-02-29
•
Expires: 1990-06-22
Abstract
Abstract A retrieving tool including extensible and retractable means for positive engagement with a wear bushing used in the oil-drilling industry, and capable of disengaging and removing such a wear bushing from its casing head.
Inventors
- 👤 H Rowe Greene Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:24
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/12
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
56 words
A well tool for retrieving a wear bushing comprising a shaft, engaging means movably attached to said shaft, means integral with said shaft and contacting said engaging means for retracting said engaging means from engagement with said wear bushing, and means integral with said shaft for urging said engaging means into engagement with said wear bushing.
Claim 2
Dependent Claim
56 words
A well tool for retrieving a wear bushing comprising a shaft, engaging means movably attached to said shaft, means integral with said shaft and contacting said engaging means for retracting said engaging means from engagement with said wear bushing, and means integral with said shaft for urging said engaging means into engagement with said wear bushing.
Claim 3
Dependent Claim
34 words
A well tool for retrieving a wear bushing as described in claim 1 wherein the means for retracting said engaging means is capable of retaining said engaging means from engagement with said wear bushing.
Claim 4
Dependent Claim
55 words
A well tool for retrieving a wear bushing as described in claim 1 wherein said retracting means comprises a collar integral with said shaft, a plate movably attached to said shaft said engaging means pivotally mounted on said plate, said collar capable of retracting said engaging means by urging said engaging means toward said shaft.
Claim 5
Dependent Claim
35 words
A well tool for retrieving a wear bushing as described in claim 1 wherein said means for urging said engaging means into engagement with said wear bushing comprises an inclined base integral with said shaft.
Claim 6
Dependent Claim
28 words
A well tool for retrieving a wear bushing as described in claim 1 wherein said engaging means comprises a plurality of legs mechanically extensible toward said wear bushing.
Claim 7
Dependent Claim
89 words
A well tool for retrieving a wear bushing as described in claim 1 wherein said engaging means comprises a plurality of legs mechanically extensible toward said wear bushing, said means for retracting said engaging means comprises a collar integral with said shaft, a plate movably attached to said shaft, said engaging means pivotally mounted on said plate, said collar capable of retracting said engaging means by urging said engaging means toward said shaft, and said means for urging said engaging means comprises an inclined base integral with said shaft.
Claim 8
Independent Claim
104 words
A method for retrieving a wear bushing from the casing head of a well comprising inserting a well tool including releasable engaging means for retrieving said wear bushing through the head of said casing, lowering said well tool inside said casing to a position where it is retained from further insertion beyond said wear bushing, retaining against rotation means to engage said wear bushing, rotating the drilling pipe to mechanically release and extend said means to engage said wear bushing, engaging said wear bushing with said extended means, and retrieving said wear bushing by extracting said retrieving tool through the head of said casing.
Claim 9
Independent Claim
104 words
A method for retrieving a wear bushing from the casing head of a well comprising inserting a well tool including releasable engaging means for retrieving said wear bushing through the head of said casing, lowering said well tool inside said casing to a position where it is retained from further insertion beyond said wear bushing, retaining against rotation means to engage said wear bushing, rotating the drilling pipe to mechanically release and extend said means to engage said wear bushing, engaging said wear bushing with said extended means, and retrieving said wear bushing by extracting said retrieving tool through the head of said casing.
Claim 10
Dependent Claim
45 words
A method for retrieving a wear bushing from the casing head of a well as described in claim 7 wherein engaging said wear bushing with said extended means is accomplished by lifting said extended means to mechanically engage said wear bushing at its lower periphery.
Claim 11
Dependent Claim
42 words
A method for retrieving a wear bushing from the casing head of a well as described in claim 7 wherein engaging said wear bushing with said extended means is accomplished by gripping the surface of said wear bushing by said extended means.
Claim 12
Dependent Claim
44 words
A method for retrieving a wear bushing from the casing head of a well as described in claim 7 wherein said engaging means is mechanically retained against rotation while the drilling pipe is rotated to mechanically extend said means to engage said wear bushing.
References Cited (Backward Citations)
US1337902A
Cited
US1653547A
Cited
US1958330A
Cited
US2634156A
Cited
US3473608A
Cited
US3489214A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |