Apparatus for retaining rig slips in alignment with a flow control device
a technology of flow control device and retaining rig, which is applied in the direction of drilling casings, drilling pipes, drilling well accessories, etc., can solve the problems of slipping pipe, affecting the alignment of drill pipes, and compressing force inward on drill pipes
Inactive Publication Date: 2015-01-08
WEATHERFORD TECH HLDG LLC
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- Summary
- Abstract
- Description
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Benefits of technology
The apparatus described in this patent is designed to secure rig slips that are gripping a drill pipe through a flow control device. The apparatus includes a plate with a small aperture that is sized to prevent the rig slips from passing through. The plate is attached to a support means that is also attached to the flow control device. The support means can be either releasably attached or integrally formed with the plate or the flow control device. The apparatus is designed to position the rig slips so that the drill pipe and the flow control device are in parallel alignment. This allows for easier connection and disconnection of the rig slips and the flow control device. The apparatus can be easily attached and detached from the flow control device, making it convenient for use in drilling operations.
Problems solved by technology
This downward motion drives the wedge-shaped rig slips into the rotary bushing, which in turn results in a compressive force inward on the drill pipe.
As a result the pipe becomes securably gripped by the rig slips.
A common problem with rig slips is misalignment of the drill pipe when it is suspended from the rotary table.
Among other problems, this can result in the suspended drill pipe not being centered on the blow-out-preventer (BOP) stack positioned below the rotary table.
If the drill pipe is misaligned in the BOP stack, this misalignment can impair the function of either the BOP pipe ram or the blind ram, or both.
This in turn jeopardizes the safety of the rig crew and creates the potential for extensive damage to the rig in the event of an uncontrolled drilling event such as a kick.
Method used
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[0017]When describing the present invention, all terms not defined herein have their common art-recognized meanings. Any term or expression not expressly defined herein shall have its commonly accepted definition understood by those skilled in the art. To the extent that the following description is of a specific embodiment or a particular use of the invention, it is intended to be illustrative only, and not limiting of the claimed invention. The following description is intended to cover all alternatives, modifications and equivalents that are included in the spirit and scope of the invention, as defined in the appended claims.
[0018]The present invention relates to an apparatus for retaining rig slips gripping a drill pipe through a bore of a flow control device, such that the axis of the drill pipe and the bore of the flow control device are substantially parallel to each other. As used herein, “flow control device” shall refer to any apparatus defining a bore intended to receive ...
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The present invention provides an apparatus for retaining rig slips gripping a drill pipe through a bore of a flow control device. The apparatus includes a plate and a support means. The plate has an aperture that constricts the rig slips against passing trough the aperture. The support means attaches the plate to the flow control device, such that the axis of the drill pipe and the bore are substantially parallel with each other.
Description
FIELD OF THE INVENTION[0001]The present invention is directed to an apparatus for retaining rig slips gripping a drill pipe in alignment with a flow control device. In particular the apparatus is attachable to the flow control device, and when so attached, positions the rig slips so that the axis of the drill pipe and the axis of the bore are substantially parallel with each other.BACKGROUND[0002]Rig slips are devices that are used to temporarily suspend a drill pipe from a drill floor. Conventional rig slips latch around the drill pipe and seat in the rotary bushing of the rotary table. The rig slips temporarily support and transmit the weight of the drill pipe to the rotary table while the operator is making a connection or tripping pipe.[0003]Rig slips typically consist of three or more hinged steel wedges that close in a circular configuration around the drill pipe. The inside surfaces of the steel wedges are fitted with replaceable, hardened tool-steel teeth that embed slightly...
Claims
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IPC IPC(8): E21B19/24
CPCE21B19/24E21B19/10E21B33/06
InventorBOYD, MICHAEL
OwnerWEATHERFORD TECH HLDG LLC