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NL2011156C2 - Riser flow control. - Google Patents

Riser flow control. Download PDF

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Publication number
NL2011156C2
NL2011156C2 NL2011156A NL2011156A NL2011156C2 NL 2011156 C2 NL2011156 C2 NL 2011156C2 NL 2011156 A NL2011156 A NL 2011156A NL 2011156 A NL2011156 A NL 2011156A NL 2011156 C2 NL2011156 C2 NL 2011156C2
Authority
NL
Netherlands
Prior art keywords
pressure
slurry
riser system
riser
controlling
Prior art date
Application number
NL2011156A
Other languages
Dutch (nl)
Inventor
Johannes Bartholomeus Doesburg
Pieter Abraham Lucieer
Original Assignee
Ihc Holland Ie Bv
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 Ihc Holland Ie Bv filed Critical Ihc Holland Ie Bv
Priority to NL2011156A priority Critical patent/NL2011156C2/en
Priority to CA2918079A priority patent/CA2918079A1/en
Priority to RU2016104555A priority patent/RU2016104555A/en
Priority to PCT/NL2014/050464 priority patent/WO2015005782A1/en
Priority to JP2016525317A priority patent/JP2016528405A/en
Priority to CN201480039774.3A priority patent/CN105378214A/en
Priority to KR1020167003675A priority patent/KR20160029855A/en
Priority to EP14741974.1A priority patent/EP3019688A1/en
Priority to US14/904,636 priority patent/US20160153169A1/en
Application granted granted Critical
Publication of NL2011156C2 publication Critical patent/NL2011156C2/en

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/88—Dredgers; Soil-shifting machines mechanically-driven with arrangements acting by a sucking or forcing effect, e.g. suction dredgers
    • E02F3/8858—Submerged units
    • E02F3/8866—Submerged units self propelled
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/88—Dredgers; Soil-shifting machines mechanically-driven with arrangements acting by a sucking or forcing effect, e.g. suction dredgers
    • E02F3/90—Component parts, e.g. arrangement or adaptation of pumps
    • E02F3/905—Manipulating or supporting suction pipes or ladders; Mechanical supports or floaters therefor; pipe joints for suction pipes
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/88—Dredgers; Soil-shifting machines mechanically-driven with arrangements acting by a sucking or forcing effect, e.g. suction dredgers
    • E02F3/90—Component parts, e.g. arrangement or adaptation of pumps
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/88—Dredgers; Soil-shifting machines mechanically-driven with arrangements acting by a sucking or forcing effect, e.g. suction dredgers
    • E02F3/90—Component parts, e.g. arrangement or adaptation of pumps
    • E02F3/907—Measuring or control devices, e.g. control units, detection means or sensors
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F7/00—Equipment for conveying or separating excavated material
    • E02F7/06—Delivery chutes or screening plants or mixing plants mounted on dredgers or excavators
    • E02F7/065—Delivery chutes or screening plants or mixing plants mounted on dredgers or excavators mounted on a floating dredger
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK 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
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK 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
    • E21B17/015—Non-vertical risers, e.g. articulated or catenary-type
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C50/00—Obtaining minerals from underwater, not otherwise provided for

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Drilling And Exploitation, And Mining Machines And Methods (AREA)
  • Earth Drilling (AREA)

Abstract

A deep sea mining method includes: excavating matter at a bottom of a body of water; operating a riser system for transporting a slurry of matter and water; transporting the slurry from the bottom of a body of water upwards to a slurry processing base; and maintaining a controlled riser system pressure higher than the environmental pressure inside the riser system for avoiding forming of gas and expanding of gas contained in the slurry during transporting the slurry.

Description

Riser flow control Background
The present invention relates to a deep sea mining method comprising; - excavating matter at a bottom of a body of water, - operating a riser system for transporting a slurry of matter and water, - transporting the slurry from the bottom of a body of water upwards to a slurry processing base. EP2570340 generally relates to a device for capturing fluids lighter than water escaping from an underwater source. The device is useful for collecting and temporarily storing oil and/or gas escaping from an out-of-control deep-sea borehole. EP2570340 intends to provide an improved device for collecting and temporarily storing fluids rising from an underwater source, in particular with respect to the device's ability to handle fluids containing gas. EP2570340 discloses a riser tube having flow restrictors, such as, e.g. choke disks, arranged in its interior for restricting the flow of the fluids. According to EP2570340, gas-containing fluids may be transferred from the seabed to the underwater buffer reservoir, without requiring separation of the gas fraction at the seabed. This simplifies the structure to be deployed over the underwater source. The flow restrictors, which are preferably arranged at regular intervals along the length of the riser tube, reduce the velocity of the fluid. US6412562 relates to electrical submersible well pumps inside a riser. As the production fluids flow up the well, the pressure drops and gases that were in solution become free gases. This invention of E1S6412562 is able to artificially boost the riser pressure to increase production and force some of the free gases back into solution.
Summary of the invention
When sediment or minerals are excavated at the bottom of a sea, which is considered a high pressure environment, the minerals are fluidized in a slurry and pumped via a riser from the seafloor to a vessel, which is considered a low pressure environment. If the pumped mixture is compressible, this mixture will expand when pressure lowers. Some types of sediments contain enclosed gas. While the absolute pressure in the riser system drops during transport for the seafloor to the vessel, these enclosed gasses might become free gasses. Free gas can impose a problem for the functioning of certain devices in the riser system, such as centrifugal pumps, but can also lead to reduced controllability of the slurry flow, as the slurry velocity rises and fluctuates with the expansion of gasses.
The invention aims to provide a deep sea mining method having an improved controllability of the slurry flow.
Another object of the invention is to improve a known deep sea mining method in that a problem associated therewith is at least partly solved.
Yet another object of the invention is to provide an alternative deep sea mining method.
According to a first aspect of the invention this is realized with a deep sea mining method comprising; - excavating matter at a bottom of a body of water, - operating a riser system for transporting a slurry of matter and water, - transporting the slurry from the bottom of a body of water upwards to a slurry processing base, - maintaining a controlled riser system pressure, higher than the environmental pressure, inside the riser system for avoiding forming or release of gas and expanding of gas contained in the slurry during transporting the slurry.
Maintaining a higher pressure inside the riser system beneficially adds stability to the slurry flow and reduces creation of free gas from sediments.
Where the invention relates to mining operations and a slurry flow, EP2570340 and US6412562 distinctively relate to operations concerning an oil- or gas-flow. The oil-and gas operations is a different technical field compared with mining operations mainly because of the different flow which imposes different requirements to systems and operations. The mining slurry flow differs with a oil or gas flow at least in that the slurry has a ranging density and is inhomogeneous. In addition, the solid content of the mining slurry is much higher. From system and operation perspective, the oil and gas operations do not require active pumping since the body of water provides an overpressure. Also means in relation to risk of a blow out in a oil and gas system is not relevant for a mining system.
Deep sea here means seas having a depth of at least 500 meters, preferably at least 1000 meters.
In an embodiment, the method comprises the step measuring the pressure for providing a riser system pressure signal, and controlling the pressure in response to said pressure signal. Preferably, the method comprises controlling the riser system pressure to a predefined riser system pressure threshold. Such a threshold may be dependent on the vertical position in the riser system.
In an embodiment, the maintaining a controlled riser system pressure comprises providing pressure control means .The pressure control means may comprise active and/or passive means.
In an embodiment of the method, the pressure control means are selected from restriction, systems of bends, turbines, pumps used as turbines, and pumps.
In an embodiment of the method, a series of pressure control means is provided. This enables to control pressure along the length of the riser system.
In an embodiment of the method, the series of pressure control means is arranged along the length of the riser system for controlling pressure in the riser system. This improves pressure control along the length of the riser system.
In an embodiment of the method, adjacent control means are arranged at a predefined mutual distance. This even more improves pressure control along the length of the riser system
In an embodiment, the method comprises recovering energy from the transported slurry through the pressure control means. This enables to recover possible energy surplus downstream, which surplus has been spend to pressure control upstream.
The matter may comprise gashydrates.
According to a further aspect of the invention this is realized with a deep sea mining system for use in the method according to the invention, the system comprising; - an excavating system for excavating matter at a bottom of the body of water, - a riser system for transporting a slurry of matter and water from the bottom of a body of water upwards to a slurry processing base, the riser system comprising an adjustable pump means proximate a bottom of a body of water, - pressure control means for maintaining a controlled riser system pressure higher than the environmental pressure inside the riser system for avoiding forming or release of gas and expanding of gas contained in the slurry during transporting the slurry
In an embodiment, the deep sea mining system comprises a series of pressure control means arranged along the length of the riser pipe for controlling pressure in the riser system. This improves pressure control along the length of the riser system.
In an embodiment of the deep sea mining system, adjacent control means are arranged at a predefined mutual distance.
In an embodiment of the deep sea mining system, the pressure control means comprise active and/or passive means.
In an embodiment of the deep sea mining system, the pressure control means are selected from restrictor, systems of bends, turbines, pumps used as turbines, and pumps.
In an embodiment, the deep sea mining system comprises; - measuring means for measuring the riser system pressure in order to provide a riser system pressure signal, - a control unit operationally coupled with the measuring means and the pressure control means for controlling the riser system pressure in response to said pressure signal.
The invention further relates to a device comprising one or more of the characterising features described in the description and/or shown in the attached drawings.
The invention further relates to a method comprising one or more of the characterising features described in the description and/or shown in the attached drawings.
The various aspects discussed in this patent can be combined in order to provide additional advantages.
Description of the drawings
The invention will be further elucidated referring to an preferred embodiment shown in the schematic drawings wherein shown in:
Fig. 1 in side view a deep sea mining system according to the invention, fig. 2 in side view, a further embodiment a deep sea mining system according to the invention; and fig. 3 a detail of a the mining system of fig. 1.
Detailed description of embodiments
Figure 1 shows a deep sea mining system 1 for use in a deep sea mining method. The mining system 1 comprises a excavating system 7 for excavating matter 2 at a bottom 9 of a body of water 3. The excavating system 7 has a boom member provided with a cutting member at its lower end. The excavating system 7, may float or be supported by the bottom 9 in a rolling manner.
The mining system 1 comprises a riser system 4 for transporting a slurry 13 of matter and water from the bottom 9 of a body of water upwards to a slurry processing base 6. The riser system 4 comprises an adjustable pump means 11 proximate the bottom 9 of a body of water for pressurized transport of the slurry 13. The base 6 is for example a floating vessel (fig. 1) or a floating platform (fig. 2) or a stationary platform (not shown).
The mining system 1 comprises pressure control means 5a, 5b, 5c, 5d for maintaining a controlled riser system pressure higher than the environmental pressure inside the riser system for avoiding forming of gas and expanding of gas contained in the slurry during transporting the slurry. In this case, the riser system 4 is provided with a series of pressure control means 5a, 5b, 5c, 5d arranged along the length of the riser system 4 for controlling pressure in the riser system. Here, adjacent control means 5a, 5b, 5c, 5d are arranged at a predefined mutual distance d. The riser system 4 is a pipe or line which extends from the bottom 9 of the body of water 3 up to the slurry processing base 6 at the water surface 10.
The pressure control means 5a, 5b, 5c, 5d may be active and/or passive means which take the form of a (not shown) restrictor, systems of bends, turbines, pumps used as turbines, and pumps 12a, 12b schematically shown in fig. 3.
The deep sea mining system 1 may comprise measuring means (not shown) for measuring the riser system pressure in order to provide a riser system pressure signal, as well as a control unit (not shown) operationally coupled with the measuring means and the pressure control means for controlling the riser system pressure in response to said pressure signal.
It will also be obvious after the above description and drawings are included to illustrate some embodiments of the invention, and not to limit the scope of protection. Starting from this disclosure, many more embodiments will be evident to a skilled person which are within the scope of protection and the essence of this invention and which are obvious combinations of prior art techniques and the disclosure of this patent.

Claims (17)

1. Werkwijze voor diepzee mijnbouw omvattend; - delven van materie (2) bij een bodem (9) van een waterlichaam (3), - exploiteren van een stijgbuissysteem (4) voor het transporteren van een slurrie (13) van materie en water, - transporteren van de slurrie vanaf de bodem van een waterlichaam opwaarts naar een basis (6) voor het verwerken van slurrie, - handhaven van een geregelde interne druk van het stijgbuissysteem, hoger dan de omgevingsdruk, voor het voorkomen van vorming of vrijkomen van gas en expanderen van gas gehouden in de slurrie tijdens transport van de slurrie.1. Method for deep-sea mining comprising; - mining matter (2) at a bottom (9) of a body of water (3), - operating a riser system (4) for transporting a slurry (13) of matter and water, - transporting the slurry from the bottom from a body of water up to a base (6) for processing slurry, - maintaining a controlled internal pressure of the riser system, higher than the ambient pressure, to prevent formation or release of gas and expansion of gas held in the slurry during transport of the slurry. 2. Werkwijze volgens conclusie 1, omvattend de stap meten van de druk voor het verschaffen van een druksignaal van het stijgbuissysteem, en de regulering van de druk in reactie op het druksignaal.The method of claim 1, comprising the step of measuring the pressure to provide a pressure signal from the riser system, and regulating the pressure in response to the pressure signal. 3. Werkwijze volgens conclusie 2, omvattend het regelen van de druk van het stijgbuissysteem naar een voorgedefinieerde drempelwaarde van de druk van het stijgbuissysteem.The method of claim 2, comprising controlling the pressure of the riser system to a predefined threshold value of the pressure of the riser system. 4. Werkwijze volgens een voorgaande conclusie, waarbij handhaven van een geregelde druk van het stijgbuissysteem omvat, verschaffen van middelen (5a, 5b, 5 c, 5 d, 11) voor het regelen van druk.The method of any preceding claim, wherein maintaining a controlled pressure of the riser system comprises providing means (5a, 5b, 5c, 5d, 11) for controlling pressure. 5. Werkwijze volgens conclusie 4, waarbij de middelen voor het regelen van druk actieve en/of passieve middelen omvatten.The method of claim 4, wherein the pressure control means comprises active and / or passive means. 6. Werkwijze volgens een voorgaande conclusie 4 of 5, waarbij de middelen voor het regelen van druk zijn geselecteerd uit restrictie, bochtsystemen, turbines, pompen gebruikt als turbines en pompen.A method according to any preceding claim 4 or 5, wherein the means for controlling pressure are selected from restriction, bend systems, turbines, pumps used as turbines and pumps. 7. Werkwijze volgens conclusie 4 of 5, waarbij een serie middelen voor het regelen van druk is verschaft.The method of claim 4 or 5, wherein a series of means for controlling pressure is provided. 8. Werkwijze volgens conclusie 7, waarbij de serie middelen voor het regelen van druk is gerangschikt langs de lengte van het stijgbuissysteem voor het regelen van de druk in het stijgbuissysteem.The method of claim 7, wherein the series of pressure control means is arranged along the length of the riser system for controlling the pressure in the riser system. 9. Werkwijze volgens conclusie 7 of 8, waarbij aangrenzende middelen voor het regelen van druk zijn gerangschikt op een vooraf gedefinieerde onderlinge afstand (d).The method of claim 7 or 8, wherein adjacent pressure control means are arranged at a predefined mutual distance (d). 10. Werkwijze volgens een voorgaande conclusie, omvattend terugwinnen van energie uit slurrie in transport door middel van de middelen voor het regelen van druk.A method according to any preceding claim, comprising recovering energy from slurry in transport by means of pressure control means. 11. Werkwijze volgens een voorgaande conclusie, waarbij de materie gashydraten omvat.The method of any preceding claim, wherein the matter comprises gas hydrates. 12. Diepzee mijnbouw systeem (1) voor gebruik in een werkwijze volgens een voorgaande conclusie 1-11, waarbij het systeem omvat; - een graafinrichting (7) voor het graven van materie (2) bij een bodem (9) van een waterlichaam (3), - een stijgbuissysteem (4) voor het transporteren van een slurrie (13) van materie en water vanaf de bodem van een waterlichaam opwaarts naar een basis (6) voor het verwerken van slurrie, waarbij het stijgbuissysteem een instelbaar pompmiddel (11) omvat nabij de bodem van een waterlichaam, - middelen (5a, 5b, 5c, 5d) voor het regelen van druk voor het handhaven van een geregelde interne druk van het stijgbuissysteem, hoger dan de omgevingsdruk, voor het voorkomen van vorming of vrijkomen van gas en expanderen van gas gehouden in de slurrie tijdens transport van de slurrie.A deep-sea mining system (1) for use in a method according to a preceding claim 1-11, wherein the system comprises; - an excavator (7) for digging matter (2) at a bottom (9) of a body of water (3), - a riser pipe system (4) for transporting a slurry (13) of matter and water from the bottom of a body of water up to a base (6) for processing slurry, the riser system comprising an adjustable pumping means (11) near the bottom of a body of water, - means (5a, 5b, 5c, 5d) for controlling pressure for maintaining a controlled internal pressure of the riser system, higher than the ambient pressure, to prevent formation or release of gas and expansion of gas held in the slurry during transport of the slurry. 13. Diepzee mijnbouw systeem volgens conclusie 12, omvattend een serie middelen voor het regelen van druk gerangschikt langs de lengte van het stijgbuissysteem voor het regelen van de druk in het stijgbuissysteem.The deep-sea mining system of claim 12, comprising a series of means for controlling pressure arranged along the length of the riser system for controlling the pressure in the riser system. 14. Diepzee mijnbouw systeem volgens conclusie 13, waarbij aangrenzende middelen voor het regelen van druk gerangschikt zijn op een vooraf gedefinieerde onderlinge afstand (d).The deep-sea mining system of claim 13, wherein adjacent pressure control means are arranged at a predefined mutual distance (d). 15. Diepzee mijnbouw systeem volgens een voorgaande conclusie, waarbij de middelen voor het regelen van druk actieve en/of passieve middelen omvatten.A deep-sea mining system according to any preceding claim, wherein the means for controlling pressure comprises active and / or passive means. 16. Diepzee mijnbouw systeem volgens een voorgaande conclusie, waarbij de middelen voor het regelen van druk zijn geselecteerd uit restrictie, bochtsystemen, turbines, pompen gebruikt als turbines en pompen.A deep-sea mining system according to any preceding claim, wherein the means for controlling pressure are selected from restriction, bend systems, turbines, pumps used as turbines and pumps. 17. Diepzee mijnbouw systeem volgens een voorgaande conclusie, omvattend; - meetmiddelen voor het meten van de druk van het stijgbuissysteem voor het verschaffen van een druksignaal van het stijgbuissysteem, - een regeleenheid operationeel verbonden met de meetmiddelen en de middelen voor het regelen van druk voor de regulering van de druk van het stijgbuissysteem in reactie op het druksignaal.A deep-sea mining system according to any preceding claim, comprising; - measuring means for measuring the pressure of the riser system to provide a pressure signal from the riser system, - a control unit operatively connected to the measuring means and the means for controlling pressure for regulating the pressure of the riser system in response to the pressure pressure signal.
NL2011156A 2013-07-12 2013-07-12 Riser flow control. NL2011156C2 (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
NL2011156A NL2011156C2 (en) 2013-07-12 2013-07-12 Riser flow control.
CA2918079A CA2918079A1 (en) 2013-07-12 2014-07-09 Riser flow control
RU2016104555A RU2016104555A (en) 2013-07-12 2014-07-09 REGULATOR FLOW CONTROL
PCT/NL2014/050464 WO2015005782A1 (en) 2013-07-12 2014-07-09 Riser flow control
JP2016525317A JP2016528405A (en) 2013-07-12 2014-07-09 Riser flow control
CN201480039774.3A CN105378214A (en) 2013-07-12 2014-07-09 Riser flow control
KR1020167003675A KR20160029855A (en) 2013-07-12 2014-07-09 Riser flow control
EP14741974.1A EP3019688A1 (en) 2013-07-12 2014-07-09 Riser flow control
US14/904,636 US20160153169A1 (en) 2013-07-12 2014-07-09 Riser flow control

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL2011156 2013-07-12
NL2011156A NL2011156C2 (en) 2013-07-12 2013-07-12 Riser flow control.

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NL2011156C2 true NL2011156C2 (en) 2015-01-13

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NL2011156A NL2011156C2 (en) 2013-07-12 2013-07-12 Riser flow control.

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US (1) US20160153169A1 (en)
EP (1) EP3019688A1 (en)
JP (1) JP2016528405A (en)
KR (1) KR20160029855A (en)
CN (1) CN105378214A (en)
CA (1) CA2918079A1 (en)
NL (1) NL2011156C2 (en)
RU (1) RU2016104555A (en)
WO (1) WO2015005782A1 (en)

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