Method and a device for preventing pipeskidding
AssigneesMalm Orstad AS, Odfjell Well Services AS
InventorsTor Egil Mong, Tommy Johnsen
Life of this patent
Estimating the term…
Abstract
A method and device for preventing a pipe string (5) clampingly arranged in a slips (2) from slipping out of the slips (2) in the event of the pipe string (5) slipping in the slips (2), wherein a pipe clamp/tong (22) is clamped, preferably hydraulically, onto the pipe string (5) at a position above the slips (2) and maintained in the clamped state for essentially as long as the pipe string (5) is held by the slips (2), the pipe clamp/tong (22), in the event of the pipe string (5) slipping in the slips (2), being displaced together with the pipe string (5) until the pipe clamp/tong (22) stops against the wedges (16) of the slips (2).
Claims18
A device for preventing a pipe string clampingly arranged in a slips from slipping out of said slips, said device comprising:
- a mechanised wedge manipulator adapted to couple with a slips wedge and to manipulate a pipe string in said slips, said mechanised wedge manipulator including a foundation frame that is adapted to be mounted on a drill floor, a working frame comprising a swivel connection and a vertical displacement assembly, an arm frame, and a pipe clamp;
- wherein said foundation frame has an axis about which said working frame rotates said swivel connection being rotatably mounted on said axis;
- wherein said arm frame has a first arm-frame end and a second arm-frame end, said pipe-clamp being mounted on said second arm-frame end;
- wherein said first arm-frame end is coupled to said swivel connection via said vertical displacement assembly, said arm frame being rotatable toward or away from said slips by means of said swivel connection, and said arm frame being vertically repositionable by means of said vertical displacement assembly, and wherein said arm frame maintains a parallel orientation to said foundation frame while being vertically repositioned and while said pipe clamp is in a pipe-clamping position;
- and
- wherein said slips wedge is inserted in said slips, and when said pipe clamp is clamped about said pipe string in said slips, said vertical displacement assembly is adapted to allow said arm frame to move downward until said pipe clamp rests on an upper edge of said slips wedge, thereby transferring weight of said pipe string to said slips wedge and forcing said slips wedge to more firmly grip said pipe string.
A mechanised wedge manipulator for preventing a pipe string clampingly arranged in a slips from slipping out of said slips, said mechanised wedge manipulator comprising:
- a foundation frame that is adapted to be mounted on a drill floor;
- a working frame comprising a swivel bracket and a vertical displacement linkage that is hydraulically operated;
- an arm frame;
- and
- a pipe clamp adapted to couple with a slips wedge and to manipulate a pipe string in said slips;
- wherein said foundation frame has an axis on which said swivel bracket is rotatably mounted;
- wherein said arm frame has a first arm-frame end and a second arm-frame end, said pipe clamp being mounted on said second arm-frame end and said first arm-frame end being pivotably coupled with said vertical displacement linkage;
- wherein said arm frame is rotatable toward or away from said slips by means of said swivel bracket;
- and
- wherein said arm frame is vertically repositionable by means of said vertical displacement linkage while said pipe clamp is in a pipe-clamping position, such that said arm frame maintains a parallel orientation to said foundation frame while being vertically repositioned.
Dependencies are inferred from the claim text.