Methods and systems for raising and lowering a rig mast and substructure by remote control
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a technology of remote control and rig mast, which is applied in the direction of slitting machines, underground mining, surface mining, etc., can solve the problems of unstable mast and relatively long mast assembly
Inactive Publication Date: 2009-08-13
NAT OILWELL VARCO LP
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[0009]The present invention, in certain aspects, provides a system for remotely raising and lowering a mast of a drilling rig. In one particular aspect, an operator at a distance from a rig, using a remote control system according to the present invention,
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With such a system the the mast assembly can be relatively long
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[0033]The present invention provides systems and methods for remotely controlling rig apparatus used to raise and lower a rig mast. This invention's teachings are applicable to any rig which has an erectable mast raised and lowered by a drawworks and substructure raised with hydraulic winches or cylinders.
[0034]FIG. 1 shows a system 10 according to the present invention which includes a drilling rig 12 with a derrick 14, an A-frame 14, as part of the rig 12, on a floor 16 mounted to a substructure 18. A mast 20 pivotably connected to the floor 16 is, as shown, initially in a substantially horizontal position, e.g. for transport. The mast 20 is a typical drilling rig mast with top sheaves 22 or crown, a set of raising sheaves 24, and a raising connection lug 26. A drill line 33 is winched in an out by a drawworks 30. Lines 31 and 32 which run around the sheaves 27 and raising sheaves 24, used to raise the mast, are attached together and lifted by the traveling block 90 when the trave...
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Abstract
Systems for drilling operations, the systems including: a drilling rig with a base; a mast movably connected to the base of the drilling rig; a drawworks system for raising and lowering the mast; a drawworks control system for controlling the drawworks as it raises and lowers the mast; a remote control system for remotely controlling the drawworks control system so that the mast can be raised and lowered by personnel spaced apart from the drilling rig; and, in certain aspects, the rig including a substructure which can be raised, and lowered by remote control. This abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure and is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims, 37 C.F.R. 1.72(b).
Description
BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]This invention is directed to drilling rigs with erectable masts and substructures; and to systems and methods for raising and lowering, by remote control, such parts that are raised, e.g. rig components.[0003]2. Description of Related Art[0004]The prior art discloses a variety of rigs used in drilling and various wellbore operations; for example, and not by way of limitation, U.S. Pat. Nos. 3,340,938; 3,807,109; 3,922,825; 3,942,593; 4,269,395; 4,290,495; 4,368,602; 4,489,526; 4,569,168; 4,837,992; 6,634,436; 6,523,319 and the references cited in these patents—all these patents incorporated fully herein for all purposes.[0005]In many land drilling operations, land rigs are delivered to a site, assembled and then disassembled. One of the first steps in assembling many rigs is to raise a rig mast from a substantially horizontal transported position to a substantially vertical operational position. In many prior methods, ...
Claims
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