US 12,085,213 B2
FIV reducing device with automated control of natural frequency
Eidesen Bjørgulf Haukelidsæter, Stavanger (NO); and Ellingsen Kjell Einar, Tananger (NO)
Assigned to Equinor Energy AS, Stavanger (NO)
Appl. No. 17/441,179
Filed by Equinor Energy AS, Stavanger (NO)
PCT Filed Mar. 20, 2020, PCT No. PCT/NO2020/050080
§ 371(c)(1), (2) Date Sep. 20, 2021,
PCT Pub. No. WO2020/190152, PCT Pub. Date Sep. 24, 2020.
Claims priority of application No. 1903886 (GB), filed on Mar. 21, 2019.
Prior Publication US 2022/0163159 A1, May 26, 2022
Int. Cl. E21B 41/00 (2006.01); F16F 15/00 (2006.01); F16F 15/02 (2006.01); F16L 3/10 (2006.01); F16L 55/04 (2006.01)
CPC F16L 55/041 (2013.01) [F16F 15/002 (2013.01); F16F 15/02 (2013.01); F16L 3/1091 (2013.01); E21B 41/0007 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method of controlling flow induced vibrations in a section of pipeline caused by a flow of liquid therethrough, comprising:
measuring a flow induced vibration of the section of pipeline; and
automatically adjusting the natural frequency of the section of pipeline based on the measured vibration in order to reduce the flow induced vibration; wherein
the natural frequency of the section of pipeline is adjusted by applying a force to the section of pipeline; wherein the force is one of:
applied in a direction substantially parallel to the axis of the section of pipeline, and
a net force that is applied in a direction substantially perpendicular to the axis of the section of pipeline.