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
1998-06-22
2000-03-07
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, 166 774, 166 7751, 166162, 166170, 166122, 187252, 187253, B66F 100
Patent
active
060329297
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an apparatus in connection with 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.
2. Description of the Related Art Including Information Disclosed Under 37 C.F.R. .sctn. .sctn. 1.97 and 1.98
A derrick structure, developed by the present inventor in 1987, that has shown great promise is 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 having significantly lower air resistance can be constructed, and that the most expensive components of the derrick attain higher safety and a longer lifetime.
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 can be placed on the platform floor and the drill floor.
BRIEF SUMMARY OF THE INVENTION
The object of the present invention is to solve important, practical problems in the realization of the RamRig.TM. concept. This object is achieved by means of the features apparent from the characterizing clause of the subsequently disclosed claim 1.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS 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 lowest position;
FIG. 4 shows the derrick schematically, viewed from the front, with the top drive in its highest position;
FIG. 5 shows a yoke according to the invention, viewed from the front;
FIG. 6 shows the yoke of FIG. 6, viewed from the side; and
FIG. 7 illustrates the self-adjusting function of the yoke.
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a derrick 1 positioned on a drill floor 2. The drill floor is positioned at a higher level than the platform floor 3, so that the pipe handling equipment 4 can be placed, in the main, between the platform floor 3 and the drill floor 2. The derrick 1 is substantially gantry-shaped, with 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 that they extend along each gantry leg 5, 6 and operate between the drill floor 2 and the yoke 8, for moving the yoke 8 vertically along the guide rails 7.
The yoke 8 is provided with a plurality of sheaves 12, preferably four, for running wire lines 13. The wire lines 13 run from the drill floor 2 along each gantry leg 5, 6, over the sheaves 12 and down to the top drive 9. By retracting and extending the piston/cylinder arrangement 10, 11, it is thus possible to raise and lower the top drive 9.
In FIGS. 2, 3 and 4, the function of the lift system is seen most clearly. In FIGS. 2 and 3, the piston/cylinder arrangement 10, 11 is shown in a completely retracted condition. The top drive 9 is then in its lowest position, quite close to the drill floor. The yoke 8 is at the upper end of the piston/cylinder arrangement.
When the pistons in the piston/cylinder arrangement are extended, the yoke 8 is lifted along the guide rails 7 up to the top of the derrick 1. The top drive is then lifted, as a result of the exchange created by the wire lines 13 being run over the sheaves 12, from its position adjacent to the drill floor 2 to a position directly below the yoke 8. The height to which the top drive 9 is lifted is thus the d
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patent: 4341373 (1982-07-01), Mouton, Jr.
patent: 4890671 (1990-01-01), Baxter
patent: 5205379 (1993-04-01), Pfleger
Maritime Hydraulics AS
Walsh Donald P.
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