Implements or apparatus for applying pushing or pulling force – Apparatus for hauling or hoisting load – including driven... – With rotatable – cable contacting – pulley wheel element...
Patent
1998-06-24
2000-08-01
Walsh, Donald P.
Implements or apparatus for applying pushing or pulling force
Apparatus for hauling or hoisting load, including driven...
With rotatable, cable contacting, pulley wheel element...
254386, 254387, 254266, B66F 100
Patent
active
060955015
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an apparatus for a derrick, comprising two or more hydraulic piston-cylinder arrangements for raising and lowering a yoke which travels on guide rails in the derrick itself, where two or more wire lines are strung over sheaves rotatably attached to the yoke, said wires being attached at one end thereof to the top drive and at the other end thereof being secured to an attachment point adjacent to a drill floor, said two or more wires being run in two sets of lines, the attachment points of which wire sets are spaced apart.
BACKGROUND OF THE INVENTION
A derrick structure which was developed in 1987 by the present inventor and which has shown great promise embodies the RamRig.TM. concept. Two hydraulic piston-cylinder arrangements are used in the derrick for raising and lowering the drill string. The cylinders operate between the drill floor and a yoke which travels on guide rails in the derrick itself The advantages of this concept are numerous, some of the most important being that it is possible to place the drill floor at a higher level than the platform floor, that a derrick may be constructed having a significantly lower air resistance, that a higher level of safety and longer lifetime are attained for the most expensive components of the derrick.
Since it is possible to position the drill floor higher than the platform floor, pipe handling is significantly simplified. There is no longer any need to arrange the pipe handling equipment at a high level in the derrick. All pipe handling equipment may be placed on the platform floor and the drill floor.
The object of the present invention is to solve important, practical problems in the realization of the RamRig.TM. concept.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be explained in greater detail with reference to the enclosed drawings, where
FIG. 1 shows a RamRig.TM. derrick in every essential detail;
FIG. 2 shows the derrick schematically, viewed from the side;
FIG. 3 shows the derrick schematically, viewed from the front, with the top drive in its lowermost position;
FIG. 4 shows the derrick schematically, viewed from the front, with the top drive in its uppermost position:
FIG. 5 shows the tension equalizer assembly seen from the side,
FIG. 6 shows a portion of the tension equalizer assembly, seen from the front, and
FIG. 7 shows a portion of the tension equalizer assembly seen from above.
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a derrick 1 positioned on a drill floor 2. The drill floor is arranged at a higher level than the platform floor 3, enabling the pipe handling equipment 4 to be placed mainly between the platform floor 3 and the drill floor 2. Derrick 1 is substantially gantry-shaped, having gantry legs 5, 6. Guide rails 7 for a yoke 8 and a top drive 9 run along each gantry leg 5, 6. Hydraulic piston-cylinder arrangements 10, 11 are positioned so as to extend along each gantry leg 5, 6, and operate between drill floor 2 and yoke 8, for moving yoke 8 vertically along guide rails 7.
The yoke 8 is provided with a plurality of sheaves 12, preferably four, for running the wire lines 13. Wire lines 13 extend from drill floor 2 along each gantry leg 5, 6, over sheaves 12 and down to top drive 9. By retracting and extending the piston-cylinder arrangement 10, 11, it is thereby possible to raise and lower top drive 9.
In FIGS. 2, 3 and 4 the function of the hoisting system is seen most clearly. In FIGS. 2 and 3 the piston-cylinder arrangement 10, 11 is shown in a completely retracted state. Top drive 9 is then at its lowermost position, quite close to the drill floor. Yoke 8 is at the upper end of the piston-cylinder arrangement.
When the pistons in the piston-cylinder arrangement are extended, yoke 8 is lifted along guide rails 7 up to the top of derrick 1. The top drive is then lifted, as a result of the transmission generated as wire lines 13 are run over sheaves 12, from its position adjacent drill floor 2 to a position directly below yoke 8. The height to wh
REFERENCES:
patent: 1472386 (1923-10-01), Cook
patent: 1700587 (1929-01-01), Higbee
patent: 3960360 (1976-06-01), Elliston
patent: 4170340 (1979-10-01), Mouton, Jr.
patent: 4341373 (1982-07-01), Mouton, Jr.
patent: 4605078 (1986-08-01), Bukovitz et al.
patent: 4767100 (1988-08-01), Philpot
Maritime Hydraulics AS
Pham Minh-Chau
Walsh Donald P.
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