CA2576875A1 - Lightweight catenary system - Google Patents

Lightweight catenary system Download PDF

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Publication number
CA2576875A1
CA2576875A1 CA002576875A CA2576875A CA2576875A1 CA 2576875 A1 CA2576875 A1 CA 2576875A1 CA 002576875 A CA002576875 A CA 002576875A CA 2576875 A CA2576875 A CA 2576875A CA 2576875 A1 CA2576875 A1 CA 2576875A1
Authority
CA
Canada
Prior art keywords
catenary
weight
pipe
flexible pipe
proximity
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.)
Granted
Application number
CA002576875A
Other languages
French (fr)
Other versions
CA2576875C (en
Inventor
Michael J. Bryant
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.)
DeepFlex Inc
Original Assignee
Deepflex, Inc.
Michael J. Bryant
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 Deepflex, Inc., Michael J. Bryant filed Critical Deepflex, Inc.
Publication of CA2576875A1 publication Critical patent/CA2576875A1/en
Application granted granted Critical
Publication of CA2576875C publication Critical patent/CA2576875C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
    • F16L1/12—Laying or reclaiming pipes on or under water
    • F16L1/20—Accessories therefor, e.g. floats, weights
    • F16L1/24—Floats; Weights

Abstract

A lightweight catenary system for deepsea operations in which a lightweight flexible pipe such as disclosed in U.S. Patent No. 6,491,779 is suspended in seawater from a vessel or platform, and having a positive or nearly positive buoyancy, and which is stabilized by disposing weight in proximity to or attached to the lower portion of the pipe at or near the seabed, whereby the weight and costs of supporting heavy pipe in offshore operations is reduced or eliminated.

Claims (10)

1. A lightweight catenary system comprising:

a. a lightweight flexible pipe which has an upward or nearly upward buoyancy when submerged in seawater forming a catenary configuration which hangs under tension in a downward curve in proximity to the seabed to the area at or near the upper seawater surface; and b. some weight attached in proximity to the lower portion of the pipe, with the amount of weight being sufficient to provide resistance to floatation of the flexible pipe and with tension on the pipe to stabilize and maintain the catenary configuration from displacement caused by lateral and other forces in the subsea.
2. The system of claim 1, wherein the lightweight flexible pipe is substantially entirely non-metallic.
3. The system of claim 1, wherein the weight is distributed along the lower portion of the pipe in proximity to the seabed.
4. The system of claim 1, wherein the weight is a metal wire laid in a helical wrap adjacent non metallic strands.
5. A system for maintaining a flexible pipe in a substantially stable catenary configuration when suspended in seawater, comprising:

(a) suspending a flexible pipe having a positive or nearly positive buoyancy when disposed as in a catenary configuration which hangs in tension in a downward curve in proximity to seawater from at or near the seabed to the area at or near the upper seawater surface; and (b) applying weight in proximity to the lower end of said catenary to provide sufficient resistance to floatation of the pipe to stabilize the catenary;

and (c) maintaining the tension on the pipe to stabilize and maintain the catenary configuration from displacement by lateral and other forces in the subsea.
6. The system of claim 5, wherein the lightweight flexible pipe is substantially entirely non-metallic.
7. The system of claim 5, wherein the weight is distributed along the lower portion of the pipe in proximity to the seabed.
8. The system of claim 5, wherein the weight is a metal wire laid in a helical wrap adjacent nonmetallic strands.
9. A lightweight catenary system comprising;

(a) a lightweight flexible pipe which has an upward or nearly upward buoyancy when submerged in seawater in a catenary configuration;

(b) some weight attached in proximity to the lower portion of the pipe, with the amount of weight being sufficient to provide resistance to floatation of the flexible pipe to stabilize the catenary configuration;

(c) wherein the weight is a metal wire laid in a helical wrap adjacent non metallic strands.
10. A system for maintaining a flexible pipe in a substantially stable catenary configuration when suspended in seawater, comprising;

(a) suspending a flexible pipe having a positive or nearly positive buoyancy when disposed as a catenary in seawater;

(b) applying weight in proximity to the lower end of said catenary to provide sufficient resistance to floatation of the pipe to stabilize the catenary;

(c) wherein the weight is a metal wire laid in a helical wrap adjacent nonmetallic strands.
CA2576875A 2004-08-16 2004-11-10 Lightweight catenary system Expired - Fee Related CA2576875C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US10/918,843 2004-08-16
US10/918,843 US7073978B2 (en) 2004-08-16 2004-08-16 Lightweight catenary system
PCT/US2004/037385 WO2006022785A1 (en) 2004-08-16 2004-11-10 Lightweight catenary system

Publications (2)

Publication Number Publication Date
CA2576875A1 true CA2576875A1 (en) 2006-03-02
CA2576875C CA2576875C (en) 2010-05-04

Family

ID=35800112

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2576875A Expired - Fee Related CA2576875C (en) 2004-08-16 2004-11-10 Lightweight catenary system

Country Status (7)

Country Link
US (1) US7073978B2 (en)
EP (1) EP1784598A4 (en)
CN (2) CN101566254B (en)
BR (1) BRPI0418916B1 (en)
CA (1) CA2576875C (en)
NO (1) NO20071136L (en)
WO (1) WO2006022785A1 (en)

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US8714204B2 (en) * 2006-12-18 2014-05-06 Deepflex Inc. Free venting pipe and method of manufacture
US7781040B2 (en) * 2007-03-21 2010-08-24 Deepflex Inc. Flexible composite tubular assembly with high insulation properties and method for making same
US20080302535A1 (en) * 2007-06-08 2008-12-11 David Barnes Subsea Intervention Riser System
US7784723B2 (en) 2007-09-11 2010-08-31 Deepflex Inc. Layered tape guide spool and alignment device and method
GB0722459D0 (en) * 2007-11-16 2007-12-27 Wellstream Int Ltd Flexible pipe support
US20090160184A1 (en) * 2007-12-20 2009-06-25 Vo Dang The End Connector For Flexible Pipe
US7946313B2 (en) 2008-03-05 2011-05-24 Vo Dang The Flexible pipe
US8276620B2 (en) * 2008-03-05 2012-10-02 Vo Dang The Flexible pipe for offshore and other applications
US20120160510A1 (en) * 2009-08-26 2012-06-28 Deepflex Inc. Flexible catenary riser having distributed sag bend ballast
US20130312862A1 (en) * 2010-12-14 2013-11-28 Deepflex Inc. Spoolable pipe with increased compressive strength and method of manufacture
GB2492414B (en) * 2011-07-01 2013-07-03 Subsea 7 Norway Nuf Initiation of lightweight flexible pipelines and umbilicals
US9353579B2 (en) * 2011-11-29 2016-05-31 Ge Oil & Gas Uk Limited Buoyancy compensating element and method
MX2017002376A (en) * 2014-09-23 2017-08-24 Halliburton Energy Services Inc Spoolable swivel.
CN111971501B (en) * 2018-01-26 2023-04-28 马来西亚国家石油公司 Conduit assembly and method of installation

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Also Published As

Publication number Publication date
CN101566254A (en) 2009-10-28
EP1784598A1 (en) 2007-05-16
CA2576875C (en) 2010-05-04
EP1784598A4 (en) 2010-11-03
CN101566254B (en) 2011-01-12
CN101010535A (en) 2007-08-01
US20060034665A1 (en) 2006-02-16
US7073978B2 (en) 2006-07-11
WO2006022785A1 (en) 2006-03-02
CN100498029C (en) 2009-06-10
BRPI0418916B1 (en) 2018-03-13
BRPI0418916A (en) 2007-12-11
NO20071136L (en) 2007-02-28

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EEER Examination request
MKLA Lapsed

Effective date: 20191112