WO2011036300A1 - Système de mise à niveau - Google Patents

Système de mise à niveau Download PDF

Info

Publication number
WO2011036300A1
WO2011036300A1 PCT/EP2010/064320 EP2010064320W WO2011036300A1 WO 2011036300 A1 WO2011036300 A1 WO 2011036300A1 EP 2010064320 W EP2010064320 W EP 2010064320W WO 2011036300 A1 WO2011036300 A1 WO 2011036300A1
Authority
WO
WIPO (PCT)
Prior art keywords
reservoir
unit
elevation
sensor
racterised
Prior art date
Application number
PCT/EP2010/064320
Other languages
English (en)
Inventor
Per Magnus Sparrevik
Original Assignee
Norges Geotekniske Institutt
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 Norges Geotekniske Institutt filed Critical Norges Geotekniske Institutt
Publication of WO2011036300A1 publication Critical patent/WO2011036300A1/fr

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C5/00—Measuring height; Measuring distances transverse to line of sight; Levelling between separated points; Surveyors' levels
    • G01C5/04—Hydrostatic levelling, i.e. by flexibly interconnected liquid containers at separated points

Definitions

  • the present invention relates to levelling, that is measurement of elevations, relative or absolute. More specifically, the invention relates to a levelling system that is particularly useful for measurements under water, as the levelling system can withstand harsh environments and rough treatment whilst the accuracy and reliability are maintained, independent of the water conditions and depth. The invention also relates to a method for subsea levelling, using the system of the invention.
  • the objective is met with the present invention providing a levelling system for use subsea, also in the vicinity of a subsea hammer, the system comprising a sensor unit including a pressure sensor and a reservoir unit including a liquid reservoir.
  • the system is distinctive in that it further comprises: a liquid filled line and a gas filled line;
  • the units are isolated from the ambient water pressure, the reservoir unit is located at higher level than the sensor unit, a lower part of the reservoir is liquid filled and is connected with the liquid filled line to the pressure - or liquid side of the sensor, an upper part of the reservoir is gas filled and is connected with the gas filled line to a compensating - or gas side of the sensor.
  • the sensor is a differential or vented pressure sensor located in the sensor unit.
  • the enclosures of the reservoir and sensor units are sealed and pressure resistant, isolating the interior from the external water pressure.
  • the lines are fluidly connected to the respective units as specified, preferably by using conventional pipe fittings.
  • the lines can be rigid but are preferably flexible in order to facilitate handling and allow for a large range of elevation
  • the accuracy and reliability of the system depends somewhat on the system design and directly on the density of the liquid and the sensor accuracy.
  • the sensor unit comprises means for real time monitoring of the measured pressure or elevation of the reservoir unit.
  • This allows for real time measurements and elevation control during for example final driving of pre- installed foundation piles to pre-defined stick up elevations for simplified mating to jackets or platforms structures for example used for offshore wind turbines, or positioning a subsea structure for oil and gas production on the seabed, or precise displacement control during seabed recovery of major offshore structures during for example platform removal, or any underwater construction work or deformation testing requiring accurate levelling.
  • the availability of accurate and reliable real time levelling data facilitates the operations and adjustments thereof significantly, contributing to significant savings and reduced risk.
  • the means for real time monitoring can be based on conventional electrical or optical means, communicating via cables or acoustic transponders.
  • a data logger possibly with a subsea display, is a part of the system.
  • the sensor is recording at high sampling rate and data are filtered and resampled for improved quality in displayed real -time data.
  • the configuration described in the invention allows for placement of the sensor unit (sensor and optional data logger) remote from the reservoir unit which is deployed on the object to be monitored (for example at the hammer).
  • the sensitive electronic parts are subjected to less chock and vibration during for example pile driving.
  • the sensor unit must be located below the reservoir unit and one of the units should preferably be located at a fixed datum.
  • the sensor unit is the fixed reference for measurements if the measuring points are located above, higher than, the sensor unit.
  • the reservoir unit is the fixed reference for measurements if the measuring points are located below, lower than, the reservoir unit.
  • the reservoir unit comprises fixture/docking arrangement for deployment to receptacles/brackets on the object for which elevation is to be measured, assuming the sensor unit is located at a fixed datum.
  • the system comprises one or more fixed parking positions for the reservoir unit at the system handling platform (basket) used for lifting and deployment of the system. By means of fixed parking positions at defined elevations above the sensor unit the system can be calibrated in-situ and unexpected drift or offset can be detected, quantified and compensated for.
  • the unit to be deployed on the object to be measured comprises an ROV handle
  • the deployable unit with connected lines preferably has an adapted weight and layout for easy handling by an ROV (remotely operated vehicle).
  • the system platform/basket preferably has size and weight and is arranged on a unit that can be deployed by a using a crane on a vessel.
  • the lines connecting reservoir and sensor units are stored in figure eight configuration or on a reel on the system platform/basket for easy deployment.
  • a high density and chemically stable liquid is used in the liquid filled line, such as an inert heavy synthetic oil, since accuracy increases with weight and stability of the fluid.
  • the cross section area of the reservoir is preferably more than 10 times larger than the cross section area of the liquid filled line, preferably more than 100 times larger, as this will reduce any variations in the liquid head or liquid-gas interface level inside the reservoir due to external pressure variations on the lines.
  • the invention also provides a method for subsea leveling, using the system of the invention, distinctive in that the method comprises the steps:
  • the reservoir unit is fastened on the unit for which elevation is to be measured, such as a pile that is hammered down by a subsea hammer.
  • the invention also provides use of the system according to the invention, for levelling subsea.
  • the use is so that the reservoir unit is fastened to the unit for which level positions shall be measured, such as on a pile that is hammered down by a subsea hammer.
  • ROV is used for moving the reservoir unit.
  • ROT remotely operated tools
  • cranes or winches can be used for positioning.
  • Figure 1 is a sketch illustrating a system of the present invention.
  • figure 1 is a principal sketch of a system of the present invention, out of scale for increased clarity. More specifically, a reservoir unit 1 is illustrated, a sensor unit 2, a liquid filled line 3 and
  • the reservoir unit 1 is located above the sensor unit 2, a lower part of the reservoir is liquid filled and is connected with the liquid filled line 3 to the pressure or liquid side of the sensor 5, an upper part of the reservoir 1 is gas filled and is connected with the gas filled line 4 to a gas or compensating side of the sensor 5. Further, it is illustrated how the system measures the pressure from the reservoir unit 1 at an elevation 7 above a fixed datum 6, at which level the sensor unit is located.
  • the system is preferably arranged in or on a handling platform or basket that can be lifted and deployed in one operation by a typical crane on a vessel for installation and ROV services.
  • the basket or platform preferably comprises reference parking positions for the reservoir unit and a fixed datum for location of the sensor unit or reservoir unit if measurements are taken below the fixed datum.
  • an ROV will move and position the reservoir unit, alternatively the sensor unit, on positions for measuring elevations, such as hang up positions on piles and reference hang up positions.
  • the reservoir or sensor unit can be handled by an ROV with connected line lengths of above 100m.
  • the exact weight and size of the elements of the system may vary within wide limits, also the length and dimension and type of gas and liquid filled lines, according to specific needs as identified and decided by the skilled person in the art.
  • the senor unit can be connected to surface operators for example via an umbilical providing power and control.
  • the system of the invention can be used for virtually all levelling but is preferable for subsea levelling.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Measurement Of Levels Of Liquids Or Fluent Solid Materials (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

L'invention porte sur un système de mise à niveau pour utilisation sous-marine, y compris dans le voisinage d'un marteau sous-marin. Le système comprend une unité capteur comportant un capteur de pression et une unité réservoir comportant un réservoir de liquide. Le système se distingue par le fait qu'il comprend en outre: une conduite remplie de liquide et une conduite remplie de gaz ; les unités sont isolées de la pression de l'eau ambiante, l'unité réservoir est placée à un niveau plus élevé que celui de l'unité capteur, une partie inférieure du réservoir est remplie de liquide et est reliée avec la conduite remplie de liquide au côté pression ou liquide du capteur, une partie supérieure du réservoir est remplie de gaz et est reliée avec la conduite remplie de gaz à un côté compensation ou gaz du capteur. L'invention porte également sur la mise à niveau utilisant ce système.
PCT/EP2010/064320 2009-09-28 2010-09-28 Système de mise à niveau WO2011036300A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20093070A NO20093070A1 (no) 2009-09-28 2009-09-28 Nivelleringssystem og fremgangsmate for nivellering
NO20093070 2009-09-28

Publications (1)

Publication Number Publication Date
WO2011036300A1 true WO2011036300A1 (fr) 2011-03-31

Family

ID=43431155

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2010/064320 WO2011036300A1 (fr) 2009-09-28 2010-09-28 Système de mise à niveau

Country Status (2)

Country Link
NO (1) NO20093070A1 (fr)
WO (1) WO2011036300A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013037892A1 (fr) 2011-09-15 2013-03-21 Norges Geotekniske Institutt Système de surveillance de l'élévation sous-marine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2557021A (en) * 1946-09-12 1951-06-12 Standard Oil Dev Co Hydraulic system for measuring differences in elevation
GB2224845A (en) * 1988-11-10 1990-05-16 Inst Francais Du Petrole Device for determining the vertical distance between two elements at unequal heights
US5517869A (en) * 1994-01-04 1996-05-21 The Stanley Works Hydrostatic altimeter error compensation
WO1999000644A1 (fr) * 1997-06-26 1999-01-07 Stephen Carl Henderson Indicateur de hauteur relative
EP0927871A1 (fr) * 1997-12-29 1999-07-07 Hans-Jürgen Rathkamp Dispositif pour déterminer des différences de niveaux

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2557021A (en) * 1946-09-12 1951-06-12 Standard Oil Dev Co Hydraulic system for measuring differences in elevation
GB2224845A (en) * 1988-11-10 1990-05-16 Inst Francais Du Petrole Device for determining the vertical distance between two elements at unequal heights
US5517869A (en) * 1994-01-04 1996-05-21 The Stanley Works Hydrostatic altimeter error compensation
WO1999000644A1 (fr) * 1997-06-26 1999-01-07 Stephen Carl Henderson Indicateur de hauteur relative
EP0927871A1 (fr) * 1997-12-29 1999-07-07 Hans-Jürgen Rathkamp Dispositif pour déterminer des différences de niveaux

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013037892A1 (fr) 2011-09-15 2013-03-21 Norges Geotekniske Institutt Système de surveillance de l'élévation sous-marine

Also Published As

Publication number Publication date
NO20093070A1 (no) 2011-03-29

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