Power plants – Pressure fluid source and motor – With control means for structure storing work driving energy
Patent
1998-06-22
2000-08-01
Nguyen, Hoang
Power plants
Pressure fluid source and motor
With control means for structure storing work driving energy
60477, 91421, 91436, 91458, 91519, F16D 3102
Patent
active
060949104
DESCRIPTION:
BRIEF SUMMARY
This application is the national phase of international application PCT/NO96/00294 filed Dec. 18, 1996.
BACKGROUND 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 wire lines being at one end attached to the top drive and at the other end to an attachment point adjacent to a drill floor, said two or more wire lines being run in two sets of lines, the attachment points of which are spaced apart.
DESCRIPTION OF THE RELATED ART
A derrick structure, developed by the present inventor in 1987, that has shown great promise is the RamRig.TM. concept. Two or more 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.
SUMMARY OF THE INVENTION
The object of the present invention is to solve important. practical problems in the realization of the RamRig.TM. concept. The present invention is an apparatus for a derrick, including hydraulic piston/cylinder arrangements for raising and lowering a yoke travelling on guide rails attached to the derrick. A hydraulic system having different modes of operation is provided for the operation of the piston/cylinder arrangements. The hydraulic system can operate in a normal mode for raising or lowering the yoke and in other modes by interconnecting upper and lower chambers of the piston/cylinder arrangements and utilizing a differential surface area of the piston exposed to the two chambers for rapidly raising or lowering the yoke. Accumulators can be used to provide additional pressure to the piston/cylinder arrangements.
BRIEF DESCRIPTION OF THE DRAWING
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;
FIGS. 5-13 show the drive means of the piston/cylinder arrangements in various modes of operation.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
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,
REFERENCES:
patent: 4216702 (1980-08-01), Brundidge et al.
patent: 4397221 (1983-08-01), Friesen et al.
patent: 4635532 (1987-01-01), Tanino et al.
patent: 4723476 (1988-02-01), Stucky
patent: 5014734 (1991-05-01), Smith
patent: 5034892 (1991-07-01), Saotome
Maritime Hydraulics AS
Nguyen Hoang
LandOfFree
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