Riser tensioner system for use on offshore platforms

Details Riser tensioner system for use on offshore platforms Riser tensioner system for use on offshore platforms

1991-02-26

1992-04-07

Neuder, William P.

Wells

Submerged well

Submerged, buoyant wellhead or riser

166355, 166367, 175 7, 254392, E21B 1909

Patent

active

051019051

ABSTRACT:
A riser tensioner system 10 includes a pair of supports 14, 16 affixed to an offshore platform in spaced apart relation to one another. A shaft 24 extends between the supports 14, 16 and is pivotally coupled thereto by an elastomeric bearing 26. A central support 22 is pivotally coupled to the shaft 24 at about the midpoint between the supports 14, 16 and fixedly coupled to coil springs 30 or elastomeric springs 100 coaxially arranged about the shaft 24 and extending between the central support 22 and each of the supports 14, 16. The central support 22 is also coupled to a riser 12 so that relative movement between the offshore platform and the riser 12 causes the central support 22 to pivot on the shaft 24 and wind or unwind the coil springs 30 or elastomeric springs 100 for relative upward and downward movement thereof. A pretensioner mechanism 42 increases the force exerted by the springs 30 or elastomeric springs 100 to increase the upward force applied to the riser 12. In this manner, the riser tensioner system 10 fully supports the riser 12 while allowing relative vertical movement therebetween.

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