Patent US3834672A successfully refreshed from Google Patents.
US3834672A
Expired / Lapsed
US
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Drill string heave compensator and latching apparatus
Assignee: Western Gear Machinery Co
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Filing: 1973-04-30
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Granted: 1974-09-10
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Expires: 1993-04-30
Abstract
Abstract A floating drilling derrick is provided with a split crown block and an opening to allow passage of a heave compensator cylinder which is secured to a lower traveling block. The piston rod of the compensator is secured to a drill string carrier. Coupling means are provided in the traveling block and carrier to selectively lock out the heave compensator. The traveling block and carrier are kept in proper orientation by guides thereon cooperating with guide rails on the derrick.
Inventors
- 👤 R Hawley
- 👤 R Hollyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:07
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/08; E21B19/09; B; B66; B66D; B66D1/00; B66D1/28; B66D1/40; B66D1/48; B66D2700/00; B66D2700/01; B66D2700/0108
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
154 words
On a floating drilling platform of the type having a derrick, an upper crown block assembly having a plurality of sheaves mounted on the derrick, a lower traveling block assembly having a plurality of sheaves, powered cable means interconnecting the traveling block assembly and the crown block assembly, a rotary carrier for supporting the drill string below the traveling block, and a hydraulic heave compensator between the traveling block assembly and the rotary carrier; said crown block being formed with a vertical opening passing between said sheaves and said heave compensator comprising a central cylinder mounted on the traveling block assembly and arranged to pass through said vertical opening while the traveling block is selectively raised by the cable means, a piston in said cylinder having a rod projecting downwardly to said carrier, and coupling means for selectively coupling said carrier to the traveling block assembly when the piston is raised in the cylinder.
Claim 2
Dependent Claim
154 words
On a floating drilling platform of the type having a derrick, an upper crown block assembly having a plurality of sheaves mounted on the derrick, a lower traveling block assembly having a plurality of sheaves, powered cable means interconnecting the traveling block assembly and the crown block assembly, a rotary carrier for supporting the drill string below the traveling block, and a hydraulic heave compensator between the traveling block assembly and the rotary carrier; said crown block being formed with a vertical opening passing between said sheaves and said heave compensator comprising a central cylinder mounted on the traveling block assembly and arranged to pass through said vertical opening while the traveling block is selectively raised by the cable means, a piston in said cylinder having a rod projecting downwardly to said carrier, and coupling means for selectively coupling said carrier to the traveling block assembly when the piston is raised in the cylinder.
Claim 3
Dependent Claim
59 words
Apparatus according to claim 1, said crown block assembly including sets of primary sheaves spaced equidistantly on opposite sides of said vertical opening, said traveling block assembly including sets of secondary sheaves generally aligned below said sets of primary sheaves, and a transition sheave on one of said assemblies for guiding the cable means between said sets of sheaves.
Claim 4
Dependent Claim
36 words
Apparatus according to claim 2, said primary sets of sheaves lying in parallel planes and being coplanar with said secondary sheaves, and said transition sheave being directly between and at right angles to said primary sheaves.
Claim 5
Dependent Claim
75 words
Apparatus according to claim 1, said coupling means comprising a pair of parallel spaced plates on the traveling block assembly having aligned retainer pin openings, retainer pins, a tongue on said carrier having bores on opposite sides of said piston rod positionable between said spaced plates in alignment with said retainer pin openings, and means for reciprocating said retainer pins through said spaced retainer pin openings to lock said rotary carrier to said traveling block.
Claim 6
Dependent Claim
21 words
Apparatus according to claim 1 in which said rotary carrier and derrick have cooperating guide means for vertically guiding the carrier.
Claim 7
Dependent Claim
24 words
Apparatus according to claim 1 in which said traveling block assembly and derrick have cooperating guide means for vertically guiding the traveling block assembly.
Claim 8
Dependent Claim
32 words
Apparatus according to claim 1 in which said derRick has vertical parallel spaced guide rails, and respective guide means on the traveling block assembly and rotary carrier cooperating with said guide rails.
Claim 9
Dependent Claim
35 words
Apparatus according to claim 7 in which said coupling means comprises cooperating members on the traveling block assembly and rotary carrier which are maintained in operative orientation relative to one another by said guide means.
References Cited (Backward Citations)
US3336003A
Cited
US3714995A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |