System for lifting tubulars and equipment below the main deck of platforms
OwnerJack A. Craininventor
Life of this patent
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Abstract
Apparatus is provided for lifting equipment or tubulars below the deck of a platform or a drilling rig. Lifting force is monitored with a load cell. A portable platform is added above the deck of an offshore platform to allow running or retrieving a string of tubulars through the deck, thereby avoiding the need to deploy a workover or drilling rig to the platform.
Claims11
Apparatus for lifting and measuring the lift force of a load located beneath a platform or rig deck, the deck having an aperture therethrough, comprising:
- a base frame, the base frame having an aperture therethrough;
- a winch, the winch disposed on a winch beam at a selected position on the beam, the beam being supported at a spaced apart distance above the base frame by a pivot disposed at a selected position on the beam and;
- a load cell, the load cell being supported by the base frame at a selected distance from the pivot and disposed so as to support the winch beam at a spaced apart distance above the base frame.
Apparatus for moving a string of tubulars through an aperture in a deck over a well comprising:
- a least two movable beams adapted to extend between skid beams on a platform;
- a movable platform adapted to be supported by the movable beams at a selected distance above the deck and to receive slips for supporting the string of tubulars;
- winch apparatus, the winch apparatus comprising a base frame with an aperture therethrough and a winch disposed on a pivoted beam, the winch apparatus being adapted to be located between the movable platform and the deck;
- and
- a cable wrapped on the winch and supporting an elevator adapted to support the string of tubulars.
A method for moving a string of tubulars through an aperture in the main deck of a platform over a well comprising:
- placing a winch unit on the main deck of the platform, the winch unit comprising at least two winches, the winches having cable thereon and being supported by a pivoted beam, the beam being supported at a spaced apart distance above a base frame by a load cell so as to indicate the lift force exerted by each winch;
- placing movable beams between the skid beams of the platform;
- placing a movable deck above the winch unit, the movable deck being supported by the movable beams and adapted to support slips for supporting the tubulars to be moved;
- attaching to the cable of the winch an elevator, the elevator being below the main deck of the platform;
- alternatively supporting the tubular string in the slips and the elevator and moving the elevator by cable on the winch;
- and
- connecting or disconnecting joints of the string of tubulars so as to move the string of tubulars through the aperture.
Dependencies are inferred from the claim text.