AU2020101950A4 - A method to protect marine drilling riser from vortex-induced vibration - Google Patents

A method to protect marine drilling riser from vortex-induced vibration Download PDF

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Publication number
AU2020101950A4
AU2020101950A4 AU2020101950A AU2020101950A AU2020101950A4 AU 2020101950 A4 AU2020101950 A4 AU 2020101950A4 AU 2020101950 A AU2020101950 A AU 2020101950A AU 2020101950 A AU2020101950 A AU 2020101950A AU 2020101950 A4 AU2020101950 A4 AU 2020101950A4
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AU
Australia
Prior art keywords
vortex
induced vibration
drilling riser
marine drilling
protect marine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
AU2020101950A
Inventor
Lin Lu
Mingming Liu
Guoqiang Tang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to AU2020101950A priority Critical patent/AU2020101950A4/en
Application granted granted Critical
Publication of AU2020101950A4 publication Critical patent/AU2020101950A4/en
Ceased legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/50—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers
    • B63B21/502—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers by means of tension legs
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/01—Risers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15D—FLUID DYNAMICS, i.e. METHODS OR MEANS FOR INFLUENCING THE FLOW OF GASES OR LIQUIDS
    • F15D1/00—Influencing flow of fluids
    • F15D1/10—Influencing flow of fluids around bodies of solid material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/50—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers
    • B63B21/502—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers by means of tension legs
    • B63B2021/504—Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers by means of tension legs comprising suppressors for vortex induced vibrations

Abstract

The invention relates to a device to reduce vortex-induced vibration by using six small circular cylinders around a marine drilling riser. 'C2 ,C3 6 x d 16 C5 Fig. 1

Description

'C2 ,C3 6
x
d 16 C5
Fig. 1
Editorial Note 2020101950 There is only one page of the description
In ocean engineering, flow will separate from piles or pipelines
when fluid flow over them. Then vortices are formed in wake side of
the piles or pipelines. Periodic fluid force will be generated on the
bluff bodies because of vortices shed from them periodically.
Periodic fluid forces will lead to movement of the bluff bodies. This
is called "Vortex induced Vibration" which is called VIV for short. If
frequency of vortex shedding is the same as or close to nature
frequency of structure, "Lock-in" will occur and result in large
vibration amplitude. Consequently, service life of the structure will
be reduced. Therefore, VIV is important to engineering.
Multiple circular cylinders usually are installed together in actual
ocean engineering, taking drilling rods and adjacent foundations for
wind turbine for example. As for there are hydrodynamic
interferences between the circular cylinders, VIV for multiple
circular cylinders is much different from that of single cylinder.
We can use multiple piles to protect vortex induced vibration for
marine drill risers.
Fig. 1 shows the plane sketch of this device.

Claims (2)

Editorial Note 2020101950 There is only one page of the claim The claims defining the invention are as follows:
1. A device to reduce vortex-induced vibration by using six small
circular cylinders around the marine drilling riser.
2. The diameters of the small circular cylinders are 0.2 times of the
main riser.
Fig. 1
AU2020101950A 2020-08-23 2020-08-23 A method to protect marine drilling riser from vortex-induced vibration Ceased AU2020101950A4 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2020101950A AU2020101950A4 (en) 2020-08-23 2020-08-23 A method to protect marine drilling riser from vortex-induced vibration

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AU2020101950A AU2020101950A4 (en) 2020-08-23 2020-08-23 A method to protect marine drilling riser from vortex-induced vibration

Publications (1)

Publication Number Publication Date
AU2020101950A4 true AU2020101950A4 (en) 2020-10-01

Family

ID=72608258

Family Applications (1)

Application Number Title Priority Date Filing Date
AU2020101950A Ceased AU2020101950A4 (en) 2020-08-23 2020-08-23 A method to protect marine drilling riser from vortex-induced vibration

Country Status (1)

Country Link
AU (1) AU2020101950A4 (en)

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FGI Letters patent sealed or granted (innovation patent)
MK22 Patent ceased section 143a(d), or expired - non payment of renewal fee or expiry