US3602300A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Down-hole installation, recovery, and maintenance tool for wells
Assignee: Westinghouse Electric Corp
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Filing: 1969-06-30
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Granted: 1971-08-31
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Expires: 1989-06-30
Abstract
Abstract A down-hole maintenance tool incorporating a wire line and lubricator as well as a complete hydraulic wire line drive motor unit enclosed within a single composite pressure vessel coupled to the wellhead. The entire pressure vessel is internally exposed to the pressure of the well at the wellhead thereby eliminating all seals such as the stuffing box normally required for the passage of the wire line cable to the lubricator.
Inventors
- 👤 Albert P Jaffe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:02
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/068; E21B33/076; E21B33/08
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
159 words
A down-hole maintenance tool, including a tool assembly, adapted to be coupled to a tubing string of either a surface or a subsea well for performing wire line operations, comprising in combination: a pressure vessel including means coupling said vessel in fluid communication with said tubing string, said first recited means exposing the interior of said vessel directly to the pressure in the tubing string and allowing the interior of said vessel to be filled with the well fluid whereby the normally required stuffing box is eliminated so that any type or shape of wire for lowering the tool assembly into said tubing string can be utilized; a winch drum drive motor and winch drum coupled thereto mounted inside of said pressure vessel; a wire line wound on the winch drum and directly connected to said tool assembly; and means coupled to said pressure vessel and said drive motor for operating said drive motor from a remote control station.
Claim 2
Dependent Claim
159 words
A down-hole maintenance tool, including a tool assembly, adapted to be coupled to a tubing string of either a surface or a subsea well for performing wire line operations, comprising in combination: a pressure vessel including means coupling said vessel in fluid communication with said tubing string, said first recited means exposing the interior of said vessel directly to the pressure in the tubing string and allowing the interior of said vessel to be filled with the well fluid whereby the normally required stuffing box is eliminated so that any type or shape of wire for lowering the tool assembly into said tubing string can be utilized; a winch drum drive motor and winch drum coupled thereto mounted inside of said pressure vessel; a wire line wound on the winch drum and directly connected to said tool assembly; and means coupled to said pressure vessel and said drive motor for operating said drive motor from a remote control station.
Claim 3
Dependent Claim
41 words
The invention as defined by claim 1 wherein said drive motor comprises a hydraulic motor and said second recited means comprises a hydraulic motor and said second recited means comprises hydraulic valving and connector means coupled to said remote control station.
Claim 4
Dependent Claim
56 words
The invention as defined by claim 1 wherein said winch drum drive motor includes a motor includes a motor housing and a shaft; and additionally including: means for mounting said which drum around said motor housing; and means for locking said shaft against rotation thereby causing said housing to rotate upon operation of said drive motor.
Claim 5
Dependent Claim
19 words
The invention as defined by claim 1 wherein said winch drum drive motor comprises a radial piston hydraulic motor.
Claim 6
Dependent Claim
19 words
The invention as defined by claim 1 wherein said pressure vessel additionally includes means for containing said tool assembly.
Claim 7
Dependent Claim
25 words
The invention as defined by claim 1 wherein said wire line comprises a flat metallic ribbon of a predetermined length wound onto said winch drum.
Claim 8
Dependent Claim
20 words
The invention as defined by claim 1 wherein said wire line comprises a stranded cable wound onto said winch drum.
Claim 9
Dependent Claim
28 words
The invention as defined by claim 1 and additionally including buoyancy means attached to said pressure vessel to provide substantially neutral buoyancy of the maintenance tool in water.
Claim 10
Dependent Claim
22 words
The invention as defined by claim 8 wherein said buoyancy means comprises a substantially hollow chamber axially disposed around the pressure vessel.
Claim 11
Dependent Claim
26 words
The invention as defined by claim 8 wherein said buoyancy means comprises a housing axially disposed around the pressure vessel and including buoyancy material contained therein.
Claim 12
Dependent Claim
16 words
The invention as defined in claim 1 wherein said first recited means includes a valve assembly.
Claim 13
Dependent Claim
99 words
The invention as defined by claim 1 wherein said pressure vessel additionally comprises a relatively long hollow member containing said tool assembly. 13 The invention as defined by claim 1 wherein said pressure vessel comprises a hollow chamber housing said winch drum drive motor and winch drum and additionally including an access cover removably secured to said chamber at one end thereof, pressure sealing means located intermediate said access cover and said chamber for providing a pressure seal when said access cover is secured to said chamber and clamping means for securing said access cover to said hollow chamber.
Claim 14
Dependent Claim
30 words
The invention as defined by claim 13 wherein said pressure vessel additionally comprises an elongated tubular member terminated at one end in said hollow chamber for housing said tool assembly.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-30 | 1975-03-01 | 1975-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-30 | 1979-03-01 | 1979-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-30 | 1983-03-01 | 1983-08-31 | $7700.00 | Window Closed / Lapsed |