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1. (WO2017151852) SYSTEMS AND METHODS FOR BACKFLUSHING A RISER TRANSFER PIPE

Pub. No.:    WO/2017/151852    International Application No.:    PCT/US2017/020344
Publication Date: Sat Sep 09 01:59:59 CEST 2017 International Filing Date: Fri Mar 03 00:59:59 CET 2017
IPC: E21C 50/00
E02F 3/90
E02F 7/00
F04B 43/073
Applicants: HYDRIL USA DISTRIBUTION LLC
Inventors: NGUYEN, Dat, Manh
DUMAN, Ahmet
ESKOLA, Edward, Walfred
Title: SYSTEMS AND METHODS FOR BACKFLUSHING A RISER TRANSFER PIPE
Abstract:
A method of pumping material from a sea floor to a vessel on a sea surface, including the steps of collecting material from the sea floor using a production tool, connecting the production tool to the vessel with a riser including a riser transfer pipe, and pumping the material from the production tool to the vessel using a subsea slurry lift pump positioned between the production tool and the vessel and attached to the production tool by the riser transfer pipe. The method further includes backflushing the riser transfer pipe by running seawater through the slurry lift pump into the riser transfer pipe toward the production tool.