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1. (WO2017151829) INVERTED PULL-UP RISER TENSIONER

Pub. No.:    WO/2017/151829    International Application No.:    PCT/US2017/020302
Publication Date: Sat Sep 09 01:59:59 CEST 2017 International Filing Date: Fri Mar 03 00:59:59 CET 2017
IPC: E21B 19/00
Applicants: VETCO GRAY INC.
Inventors: KUBICHEK, Benjamin, James
PALLINI, Joseph, William
RIHA, Jesse, B.
HAVELKA, Daniel, Louis
WAGNER, Robert, James
Title: INVERTED PULL-UP RISER TENSIONER
Abstract:
Embodiments of the present disclosure include a riser tensioner (11) includes a cylinder barrel (21), a rod (25) reciprocally carried within the cylinder barrel and having an external end sealingly extending out of a proximal end of the cylinder barrel, and a piston (47) on an interior end of the rod that slides and seals against an inner surface of the cylinder barrel. The tensioner further includes a selectively sealed low pressure chamber (51) in the cylinder barrel between the piston and a distal end of the cylinder barrel and tillable with a low pressure fluid, and a selectively sealed annulus (49) between the rod and the cylinder barrel, the annulus extending between the piston and the proximal end of the cylinder barrel and fillable with an annulus fluid at a pressure higher than the low pressure fluid, thereby urging the piston and rod towards retraction.