US 12,312,892 B2
Fluid injection system and related methods
Ståle Brattebø, Tananger (NO); and Bjørgulf Haukelidsæter Eidesen, Stavanger (NO)
Assigned to HORISONT ENERGI AS, (NO)
Appl. No. 18/284,428
Filed by HORISONT ENERGI AS, Sandnes (NO)
PCT Filed Mar. 29, 2022, PCT No. PCT/EP2022/058326
§ 371(c)(1), (2) Date Sep. 27, 2023,
PCT Pub. No. WO2022/207666, PCT Pub. Date Oct. 6, 2022.
Claims priority of application No. 21165680 (EP), filed on Mar. 29, 2021.
Prior Publication US 2024/0159117 A1, May 16, 2024
Int. Cl. E21B 31/03 (2006.01); B63B 35/44 (2006.01); E21B 17/01 (2006.01); E21B 17/02 (2006.01); E21B 33/035 (2006.01); E21B 36/00 (2006.01); E21B 43/013 (2006.01)
CPC E21B 31/03 (2013.01) [B63B 35/4413 (2013.01); E21B 17/01 (2013.01); E21B 17/02 (2013.01); E21B 33/0355 (2013.01); E21B 36/00 (2013.01); E21B 43/013 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A method of removing obstructing fluid plugs from a base section of a riser, which base section extends between a receiving end connected to an upright section of the riser and an emitting end of the riser connected to a subsea template located on a seabed, which subsea template is further connected to a wellhead for a drill hole to a subterranean void into which fluid received via the riser is to be injected from the subsea template, the method comprising:
(A) heating at least one assisting liquid to a predetermined temperature, the heating being effected in a vessel,
(B) forwarding at least one transport container holding the at least one heated assisting liquid from the vessel to a storage container in the subsea template,
(C) injecting the at least one heated assisting liquid from the storage container into at least one injection point in the base section,
(D) injecting, from the vessel at least one heated assisting liquid in the upright section of the riser, and
(E) repeat steps (A) through (D) until any plugs in the riser have melted away.