US3797570A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Snubbing apparatus
Assignee: Baker Hughes Oilfield Operations LLC
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Filing: 1972-05-08
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Granted: 1974-03-19
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Expires: 1992-05-08
Abstract
Abstract Snubbing apparatus for elevating and lowering an elongated tubular structure from and into a well bore while maintaining a seal between the tubular structure and the well head, wherein the tubular structure is releaseably engageable by traveling slip and traveling blowout preventer devices and by stationary slip and stationary blowout preventer devices, alternately, to elevate and lower the tubular structure, without causing movement of the tubular structure through the closed stationary blowout preventer device.
Inventors
- 👤 K Leutwyler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:22
CPC Classifications
E; E21; E21B; E21B19/00; E21B33/00; E21B33/02; E21B33/03; E21B33/068; E21B33/072
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
228 words
In snubbing apparatus for longitudinally moving an elongated structure extending from a well head at the top of a well: support means including stationary support means and vertically traveling support means, traveling slip means carried by said traveling support means within said stationary support means and being accessible laterally through said stationary support means, stationary slip means carried by said stationary sUpport means above said traveling slip means, said slip means respectively being selectively operable to support said elongated structure and to allow free movement of said elongated structure therethrough, traveling blowout preventer means carried by said traveling support means, stationary blowout preventer means carried by said stationary support means, said blowout preventer means respectively being operable to selectively form a seal with said elongated structure and to allow movement of said elongated structure therethrough, means for forming a seal with the well head and with the respective blowout preventer means when said blowout preventer means form a seal with said elongated structure, means releasably securing said traveling slip means to said traveling support means, and means releasably securing said stationary slip means to said stationary support means, whereby non-conformities on said elongated structure can pass through said vertical traveling support means and stationary support means upon selective removal of said traveling slip means and stationary slip means from said traveling support means and stationary support means, respectively.
Claim 2
Dependent Claim
228 words
In snubbing apparatus for longitudinally moving an elongated structure extending from a well head at the top of a well: support means including stationary support means and vertically traveling support means, traveling slip means carried by said traveling support means within said stationary support means and being accessible laterally through said stationary support means, stationary slip means carried by said stationary sUpport means above said traveling slip means, said slip means respectively being selectively operable to support said elongated structure and to allow free movement of said elongated structure therethrough, traveling blowout preventer means carried by said traveling support means, stationary blowout preventer means carried by said stationary support means, said blowout preventer means respectively being operable to selectively form a seal with said elongated structure and to allow movement of said elongated structure therethrough, means for forming a seal with the well head and with the respective blowout preventer means when said blowout preventer means form a seal with said elongated structure, means releasably securing said traveling slip means to said traveling support means, and means releasably securing said stationary slip means to said stationary support means, whereby non-conformities on said elongated structure can pass through said vertical traveling support means and stationary support means upon selective removal of said traveling slip means and stationary slip means from said traveling support means and stationary support means, respectively.
Claim 3
Dependent Claim
96 words
In apparatus as defined in claim 1, said means for forming a seal with the well head comprising a tubular member connected to one of said blowout preventer means, a tubular member connected to the other of said blowout preventer means, said tubular members being telescopically engaged one within the other, sealing means between said tubular members, and actuator means for telescopically shifting said tubular members, said traveling slip means and said traveling blowout preventer means being mounted on said traveling support means with said traveling slip means releasably secured to said traveling blowout preventer means.
Claim 4
Dependent Claim
41 words
In apparatus as defined in claim 1, said blowout preventer means each comprising opposed rams shiftable between retracted positions and positions in cooperative sealing engagement with said elongated structure, and fluid pressure operated means for shifting said rams between said positions.
Claim 5
Dependent Claim
38 words
In apparatus as defined in claim 1, said traveling slip means and said stationary slip means each comprising upwardly and downwardly holding slip means operable to engage said elongated member and move the same in both vertical directions.
Claim 6
Dependent Claim
72 words
In apparatus as defined in claim 1, said traveling slip means and said stationary slip means each comprising upwardly and downwardly holding slip means operable to engage said elongated member and move the same in both vertical directions, said blowout preventer means each comprising opposed rams shiftable between retracted positions and positions in cooperative sealing engagement with said elongated structure, and fluid pressure operated means for shifting said rams between said positions.
Claim 7
Dependent Claim
37 words
In apparatus as defined in claim 1, said traveling slip means and said traveling blowout preventer means being mounted on said traveling support means with said traveling slip means releasably secured to said traveling blowout preventer means.
Claim 8
Dependent Claim
146 words
In a snubbing apparatus for longitudinally moving an elongated structure extending from a well head to the top of a well; support means including a platform mounted in vertically spaced relation above the well head, stationary blowout preventer means mounted on the well head, stationary slip means mounted on said platform, traveling blowout preventer means and interconnected traveling slip means, telescopic means for forming a seal with the well head and with said stationary and traveling blowout preventer means, and actuator means interposed between said stationary blowout preventer means and said traveling blowout preventer means for actuating said traveling blowout preventer means and interconnected traveling slip means vertically relative to said stationary slip means, whereby said elongated structure is adapted to be alternately moved vertically with respect to said well head and said platform and stationarily suppoRted with respect to said well head and said platform.
Claim 9
Dependent Claim
146 words
In a snubbing apparatus for longitudinally moving an elongated structure extending from a well head to the top of a well; support means including a platform mounted in vertically spaced relation above the well head, stationary blowout preventer means mounted on the well head, stationary slip means mounted on said platform, traveling blowout preventer means and interconnected traveling slip means, telescopic means for forming a seal with the well head and with said stationary and traveling blowout preventer means, and actuator means interposed between said stationary blowout preventer means and said traveling blowout preventer means for actuating said traveling blowout preventer means and interconnected traveling slip means vertically relative to said stationary slip means, whereby said elongated structure is adapted to be alternately moved vertically with respect to said well head and said platform and stationarily suppoRted with respect to said well head and said platform.
Claim 10
Dependent Claim
58 words
In a snubbing apparatus as defined in claim 7, said support means comprising a base, post assemblies extending between said base and said platform in spaced relation about telescopic means, said actuator means comprising fluid pressure operated cylinder and piston means incorporated in said post assemblies and connected to said traveling blowout preventer means and interconnected slip means.
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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) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |