Internal drilling riser centralizer

a technology of riser and centralizer, which is applied in the direction of drilling pipes, drilling/well accessories, sealing/packing, etc., can solve the problems of substantial pollution of drilling mud into seawater, loss of drilling mud pressure to control the pressure, and the key seat of the drilling riser or the blowout preventer stack can literally wear all the way through the metal

Inactive Publication Date: 2012-11-08
REELPOWER LICENSING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011]The object of this invention is to provide a method to centralize an rotating drill string within the bore of a drilling ris

Problems solved by technology

A key seat in the bore of the drilling riser or blowout preventer stack can literally wear all the way through the metal.
Unfortunately a hole to the seawater will cause substantial pollution of the drilling mud into the seawater and loss of drilling mud pressure to control the pressure in the well.
This loss of drill mud pressure will all

Method used

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  • Internal drilling riser centralizer
  • Internal drilling riser centralizer
  • Internal drilling riser centralizer

Examples

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Embodiment Construction

[0020]Referring now to FIG. 1, a blowout preventer stack 10 is landed on a subsea wellhead system 12 on the ocean floor 14. Drilling riser 16 extends to a drilling vessel 18 at the surface 20 of the ocean 22. At the connection of the drilling riser to the top of the blowout preventer stack is a flex joint 24 which is similar to a rubber ball joint.

[0021]Referring now to FIG. 2, riser pipe 16 is shown with an internal steel pipe 30, auxiliary pipes 32 and 34, and flotation material 36. Rotating internal pipe 38 is shown wearing a notch or keyseat 40 in the internal steel pipe 30. If the keyseat 40 wears all the way through the wall of steel pipe 30, the drilling mud 42 will leak into the ocean 22.

[0022]Referring now to FIG. 3, the section of drilling riser 16 shown comprises an upper riser joint 50, a drilling riser centralizer 52 and a lower riser joint 54. There is an upper bolted connection 56 between upper riser joint 50 and drilling riser centralizer 52 and a lower bolted connec...

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Abstract

The method of centralizing a rotating string within the bore of a subsea blowout preventer stack and a drilling riser comprising providing a multiplicity of rollers having a first position and a second position, when the rollers are in the first position the rollers defining a first circle which is proximately the size of the bore of the drilling riser, when the rollers are in the second position the rollers defining a second circle which is smaller than the first circle, and when the rollers are in the second position the rollers prevent the rotating string from contacting the bore of the subsea blowout preventer stack or the drilling riser proximate the rollers.

Description

TECHNICAL FIELD[0001]This invention relates to the general subject of centralizing the rotating pipe within a deepwater drilling riser to prevent key seating damage.CROSS-REFERENCE TO RELATED APPLICATIONS[0002]Not applicable.STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT[0003]Not applicableREFERENCE TO A “MICROFICHE APPENDIX”[0004]Not applicableBACKGROUND OF THE INVENTION[0005]The field of this invention is that of offshore floating drilling systems for drilling oil and gas wells in offshore waters. These have a blowout preventer stack landed on a wellhead on the ocean floor with a drilling riser attached to the top and continuing up to a vessel floating at the ocean surface.[0006]At the connection of the riser to the top of the blowout preventer stack there is typically a flex joint to keep the riser from being overstressed due to surface vessel movement, side forces from currents, or when the riser is allowed to be momentarily slack. An example of this type flex j...

Claims

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Application Information

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IPC IPC(8): E21B17/10
CPCE21B17/10E21B17/1007
Inventor BAUGH, BENTON FREDERICK
Owner REELPOWER LICENSING
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