Rotating control device for jackup rigs
A rotating control device includes a bowl housing with an inner aperture to receive a seal and bearing assembly. A plurality of hydraulically-actuated fail-last-position latching assemblies are disposed about an outer surface of the bowl housing to controllably extend a plurality of piston-driven dogs radially into a groove of the seal and bearing assembly. The seal and bearing assembly includes a housing, a mandrel disposed within an inner aperture of the housing, a first interference-fit sealing element attached to a bottom distal end of the mandrel, a plurality of tapered-thrust bearings indirectly mounted to the housing, a preload spacer disposed between top and bottom tapered-thrust bearings, a plurality of jam nuts to adjust a preload of the tapered-thrust bearings, and a lower seal carrier attached to the seal and bearing housing comprising a plurality of dynamic sealing elements that contact the mandrel.
1. A rotating control device comprising:
a bowl housing comprising a plurality of fluid flow ports and an inner aperture to receive a removably disposed seal and bearing assembly;
a plurality of hydraulically-actuated fail-last-position latching assemblies disposed about an outer surface of the bowl housing to controllably extend a plurality of piston-driven dogs radially into a groove of the seal and bearing assembly to controllably secure the seal and bearing assembly to the bowl housing; and
the seal and bearing assembly comprising:
a seal and bearing housing,
a mandrel disposed within an inner aperture of the seal and bearing housing,
a first interference-fit sealing element attached to a bottom distal end of the mandrel,
a plurality of tapered-thrust bearings indirectly mounted to the seal and bearing housing to facilitate rotation of the mandrel,
a preload spacer disposed between top and bottom tapered-thrust bearings,
a plurality of jam nuts to adjust a preload of the tapered-thrust bearings, and
a lower seal carrier attached to the seal and bearing housing comprising a plurality of removable seal carrier trays, a plurality of dynamic sealing elements that contact the mandrel, and a plurality of static sealing elements that contact the seal and bearing housing, wherein one or more of the dynamic sealing elements are disposed within an inner circumferential surface of one or more removable seal carrier trays.
2. The rotating control device of claim 1 , further comprising:
an intra-overshot-pipe assembly removably attached to a top distal end of the mandrel, the intra-overshot-pipe assembly comprising a second interference-fit sealing element,
wherein the intra-overshot-pipe assembly is disposed within an overshot pipe disposed above the rotating control device.
3. The rotating control device of claim 1 , further comprising:
a top flange comprising a top flange lumen attached to a top distal end of the bowl housing; and
a bottom flange comprising a bottom flange lumen attached to a bottom distal end of the bowl housing.
4. The rotating control device of claim 1 , further comprising a shroud to protect protruding portions of the hydraulically-actuated fail-last-position latching assemblies.
5. The rotating control device of claim 1 , wherein the first interference-fit sealing element seals an annulus surrounding a drill pipe.
6. The rotating control device of claim 2 , wherein the second interference-fit sealing element forms a redundant seal to the annulus surrounding a drill pipe.
7. The rotating control device of claim 2 , wherein the first interference-fit sealing element, the mandrel, and the second interference-fit sealing element rotate with a drill pipe.
8. The rotating control device of claim 2 , wherein the first interference-fit sealing element and the second interference-fit sealing element comprise natural rubber, nitrile butadiene rubber, hydrogenated nitrile butadiene rubber, polyurethane, elastomeric material, or combinations thereof.
9. The rotating control device of claim 2 , wherein the first interference-fit sealing element comprises a first seal lumen having a first seal inner aperture slightly smaller than an outer diameter of a drill pipe and the second interference-fit sealing element comprises a second seal lumen having a second seal inner aperture slight smaller than the outer diameter of the drill pipe.
10. The rotating control device of claim 2 , wherein the overshot pipe is bolted to a top flange of the bowl housing.
11. The rotating control device of claim 2 , wherein the intra-overshot-pipe assembly disposed within the overshot pipe rotates with the mandrel.
12. The rotating control device of claim 1 , wherein the plurality of tapered-thrust bearings are indirectly mounted at an offset angle to increase radial stability.
13. The rotating control device of claim 1 , wherein top tapered-thrust bearings are indirectly mounted at an offset angle in a range between 10 degrees and 40 degrees from a perpendicular line to a longitudinal axis of the rotating control device.
14. The rotating control device of claim 1 , wherein bottom tapered-thrust bearings are indirectly mounted at an offset angle in a range between −10 degrees and −40 degrees from a perpendicular line to a longitudinal axis of the rotating control device.
15. The rotating control device of claim 1 , wherein the plurality of jam nuts maintain preload with rotation of a drill pipe.
16. The rotating control device of claim 1 , wherein a bottom flange of the bowl housing is attached to an annular or blow-out preventer connection disposed below the rotating control device.
17. The rotating control device of claim 1 , wherein the plurality of fluid flow ports comprise one or more of a flow diversion port, an injection port, and a surface-backpressure management port.
18. The rotating control device of claim 2 , wherein a second seal lumen of the second interference-fit sealing element, a top flange lumen, a mandrel lumen, a first seal lumen of the first interference fit-sealing element, and a bottom flange lumen comprise a common lumen through which drill pipe is removably disposed.
19. The rotating control device of claim 1 , wherein the groove that receives the plurality of piston-driven dogs is substantially rectangular and non-tapered.
20. A rotating control device comprising:
a bowl housing comprising a plurality of fluid flow ports and an inner aperture to receive a removably disposed seal and bearing assembly;
a plurality of hydraulically-actuated fail-last-position latching assemblies disposed about an outer surface of the bowl housing to controllably extend a plurality of piston-driven dogs radially into a groove of the seal and bearing assembly to controllably secure the seal and bearing assembly to the bowl housing;
the seal and bearing assembly comprising:
a seal and bearing housing,
a mandrel disposed within an inner aperture of the seal and bearing housing,
a first interference-fit sealing element attached to a bottom distal end of the mandrel,
a plurality of tapered-thrust bearings indirectly mounted to the seal and bearing housing to facilitate rotation of the mandrel,
a preload spacer disposed between top and bottom tapered-thrust bearings,
a plurality of jam nuts to adjust a preload of the tapered-thrust bearings, and
a lower seal carrier attached to the seal and bearing housing comprising a plurality of dynamic sealing elements that contact the mandrel, and a plurality of static sealing elements that contact the seal and bearing housing; and
an overshot pipe bolted to a top flange of the bowl housing.
21. A rotating control device comprising:
a bowl housing comprising a plurality of fluid flow ports and an inner aperture to receive a removably disposed seal and bearing assembly;
a plurality of hydraulically-actuated fail-last-position latching assemblies disposed about an outer surface of the bowl housing to controllably extend a plurality of piston-driven dogs radially into a groove of the seal and bearing assembly to controllably secure the seal and bearing assembly to the bowl housing;
the seal and bearing assembly comprising:
a seal and bearing housing,
a mandrel disposed within an inner aperture of the seal and bearing housing,
a first interference-fit sealing element attached to a bottom distal end of the mandrel,
a plurality of tapered-thrust bearings indirectly mounted to the seal and bearing housing to facilitate rotation of the mandrel,
a preload spacer disposed between top and bottom tapered-thrust bearings,
a plurality of jam nuts to adjust a preload of the tapered-thrust bearings, and
a lower seal carrier attached to the seal and bearing housing comprising a plurality of dynamic sealing elements that contact the mandrel, and a plurality of static sealing elements that contact the seal and bearing housing;
an overshot pipe bolted to a top flange of the bowl housing; and
an intra-overshot-pipe assembly comprising a second interference-fit sealing element removably attached to a top distal end of the mandrel and disposed within the overshot pipe, wherein the intra-overshot-pipe assembly rotates with the mandrel.