EP3701115A1 - Systeme de largage de tube de carrotage et carrottier comportant un tel systeme - Google Patents
Systeme de largage de tube de carrotage et carrottier comportant un tel systemeInfo
- Publication number
- EP3701115A1 EP3701115A1 EP18803464.9A EP18803464A EP3701115A1 EP 3701115 A1 EP3701115 A1 EP 3701115A1 EP 18803464 A EP18803464 A EP 18803464A EP 3701115 A1 EP3701115 A1 EP 3701115A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- coring device
- drop
- control circuit
- altitude
- release
- 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
Links
Classifications
-
- 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
- E21B25/00—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors
- E21B25/18—Apparatus for obtaining or removing undisturbed cores, e.g. core barrels or core extractors the core receiver being specially adapted for operation under water
Definitions
- the invention relates to the field of coring to collect sediment samples at the bottom of the sea or lake.
- the invention relates more particularly to a system for dropping a coring tube and a corer comprising such a system.
- Borje Kullenberg developed a stationary piston corer using a mechanical system of dropping the coring device once immersed near the bottom. More particularly, the dropping of the coring device is triggered by a mechanical rocking system operated by a weight which settles on the sedimentary bottom. In the remainder of this document, the dropping of the coring device is understood to mean the operation of triggering the free fall of the coring device.
- FIGs 1 to 1 e illustrate the operation of such a release system.
- the corer essentially comprises a coring device 10 and a mechanical system 1 1 for dropping the coring device, the assembly being rigged on a cable 12 from a winch positioned on a surface vessel.
- the coring device 10 comprises a coring tube 100 loaded with a ballast 101.
- the mechanical system 1 1 comprises, a cantilevered movable arm 10 provided with a cable 1 1 1 at its distal end of predetermined length and at its proximal end, a pivot housing 1 13 mounted on the core .
- the cable 1 1 1 is equipped with a weight 1 12 at its lower end.
- the arm is under tension under the effect of weight 1 12.
- the present invention aims to overcome all or part of the aforementioned drawbacks.
- the object of the invention is in particular to propose a reliable, safe and low energy electronic delivery system.
- the invention relates to a system for dropping a coring device for taking a soil core from the bottom of the sea, said system comprising:
- a pressure sensor for measuring the depth of the coring device with respect to the surface of the sea
- an altimeter for measuring the altitude of said coring device with respect to the seabed
- control circuit connected to said power source, to said pressure sensor, to said altimeter and to said drop module, said control circuit being configured to
- the release is controlled, via the control circuit, by the altimeter, which is energized only after the coring device has reached an arming depth. This makes it possible to avoid any unintentional or premature drop of the coring device.
- such a system has a small footprint (no arm overhang).
- control circuit triggers the release of said coring device by supplying power to the drop module.
- control circuit supplies energy to the drop module as soon as the arming depth is detected and triggers the release of said coring device by sending a drop command to the drop module when the coring device reaches the altitude drop.
- the system further comprises an acoustic transducer connected to said control circuit, said control circuit being configured to supply electrical energy to said acoustic transducer when the coring device reaches the arming depth and then trigger the sending a sound signal to the surface by said acoustic transducer.
- control circuit is also configured to interrupt the transmission of the sound signal when the coring device reaches the drop altitude.
- the control circuit is configured to interrupt the transmission of a sound signal and cut the power supply of the control module if necessary.
- the control circuit is configured to stop supplying energy to said altimeter.
- the control circuit disarms the system after a while if there has been no release. This improves the safety of the operations of raising and restoring the corer.
- the drop system further comprises storage means for recording data relating to the depths and / or altitudes measured.
- the invention also relates to a corer comprising a coring device for taking a soil core at the bottom of the sea and a dropping system of the coring device, the delivery system being as defined above.
- the coring device comprises a ballast frame, at least one ballast mounted on said ballast frame and a coring tube mounted under the ballast frame and in that the drop system is attached to the ballast or ballast frame.
- the invention also relates to a method of controlling a release module for dropping a coring device, said coring device being intended to collect a soil core at the bottom of the sea, which method comprises the following steps:
- a sound signal is emitted to the surface.
- the arming of the release system only when approaching the sedimentary bottom, saves the batteries of the system and prevents, during the descent, the dropping of the coring device when the system encounters a bank of seaweed or any other obstacle other than the bottom.
- FIG. 2 is a diagram of a delivery system according to one embodiment of the invention.
- FIG. 3 is a perspective view of a delivery system according to the invention and mounted on a corer;
- FIGS. 4a-4e illustrate the various operating phases of a corer provided with a delivery system according to the invention
- FIG. 5 is a flowchart illustrating the steps of a method of release according to the invention. 5. Detailed description of the invention
- the delivery system of the invention is intended to drop a coring device.
- This coring device may consist of a weighted core tube.
- a release system 2 comprises a release module 20 to drop on command the coring device, a pressure sensor 21 for measuring the depth of the coring device relative to the surface of the sea, an altimeter 22 for measuring the altitude of the coring device with respect to the seabed, a power source 23 for electrical energy, all of these elements being connected to a control circuit 24 via means wired links. These wired links make it possible both to supply the elements of the system and to transmit control or measurement data.
- the release module 20 comprises for example an electric motor capable of rotating a cam to open a hook in the upper part of the coring device.
- the coring device 10 essentially comprises a weighted core tube.
- the power source 23 is composed of one or more batteries, for example rechargeable lithium ion batteries 5S1 P VL 34570 PM SG.
- the power source 23 continuously supplies the control circuit 24 and the pressure sensor 21.
- the control circuit 24 is configured to receive the depth measured by the pressure sensor 21, supply electrical energy to the altimeter 22 when the coring device reaches a so-called arming depth and then receive the altitude measured by the altimeter and finally trigger the dropping of the coring device when the coring device reaches a so-called drop altitude.
- the dropping of the coring device is triggered only when the drop altitude is reached. This last can only be measured after feeding the altimeter, which occurs when the coring device reaches the arming depth. This double detection (depth of arming and drop altitude) and this conditional altimeter supply makes it possible to avoid premature dropout of the coring device.
- the arming depth is previously calculated so that the system is armed at about 100 or 200 meters from the seabed. For example, if the depth at the coring zone is 2000 m, the system is armed between 1700 and 1900 m.
- the control circuit 24 and the pressure sensor are powered by the power source 23.
- the power source supplies at least the control circuit, the altimeter and the drop module.
- the pressure sensor also continues to be powered by the power source after arming to continue the depth measurements for storage for surface analysis.
- the release module can be energized only when the release altitude is detected.
- the release release command then consists in feeding the release module.
- the release module is energized as soon as the arming depth is detected.
- the dropping of the coring device is then triggered when the drop module receives a drop command from the control circuit. This release command is issued by the control circuit when the drop altitude is detected.
- the system of the invention further comprises an acoustic transducer 25 (shown in broken lines in FIG. 2) connected to the control circuit 24.
- the control circuit 24 is then configured to supply electrical energy the acoustic transducer when the coring device reaches the arming depth and then trigger the sounding of an acoustic signal to the surface.
- This sound signal makes it possible to inform the ship on the surface that the system is "armed".
- This beep is emitted continuously or in the form of beeps. It may include one or more beeps spaced a few seconds apart.
- the emission of the sound signal is advantageously interrupted by the control circuit when the coring device reaches the drop altitude. If the drop altitude is not detected after a predetermined time, for example 15 or 20 minutes, the control circuit interrupts the sound signal and disarms the system by cutting off the supply of the drop module .
- the control circuit instead of interrupting the audible signal when the drop altitude is detected, interrupts the transmission of a sound signal after a predetermined duration, for example 5 or 10 seconds, sufficiently to ensure that the operator at the surface receives the sound signal.
- the drop altitude is preferably determined to take account of the delay between the emission of the release command by the control circuit 24 and the actual release by the release module 20. Indeed, when the drop module receives the release control, the motor of the latter drives a release cam which drops the coring device. There can therefore be a delay of the order of 0.5 s or 1 s between the emission of the release command and the actual release. This means that, if you want an effective drop to 50 meters from the bottom, the drop altitude must be greater than 50 meters. This gap between the release control and the actual release can affect the accuracy of the core location.
- the surface operator can cancel the release operation after arming by sending an acoustic command to the control circuit via the acoustic transducer.
- the control circuit Upon receipt of this order of cancellation, the control circuit interrupts the power supply of the drop module.
- the system also advantageously comprises storage means for recording data relating to the depths and / or altitudes measured during the descent of the corer.
- FIG. 3 shows an example of a corer comprising a delivery system according to the invention.
- the corer comprises a coring device 3 essentially comprising a ballast frame 30, weights 31 arranged on the ballast carrier frame and a coring tube 32 mounted at the lower end of the ballast frame 30.
- the release module 20 is mounted on the upper end of the ballast frame 30 and provides a mechanical connection between the rigging means of the boat and the corer.
- the rigging means 26 comprise a lifting cable 260 provided, at its lower end, with a lug 261 and a mesh 262.
- the mesh 262 is attached to a strop 200 of the module 20.
- a loosely curled cable 27 is attached at one end to the lug 261 and at the other end to a piston within the core tube 32.
- the pressure sensor 21 and the altimeter 22 are fixed in the lower part of the ballast frame 200. In the example of FIG. 3, they are placed in the same casing 28, which is fixed to the ballast frame 30.
- the control circuit 24 is an electronic card disposed inside a box 29, which also encloses the batteries forming the power source 23.
- This box 29 is fixed to the ballast frame 30, above the ballasts 31.
- the acoustic transducer 25 is hooked to the ballast frame 30, next to the box 29.
- the box 29 is equipped with connectors to access the control circuit board and the batteries.
- a computer can then be connected to the electronic board of the control circuit 24 to program, before launching the corer, the arming depth and drop altitude and, at the end of the mission after recovery of the corer on the boat, retrieve the data recorded in the storage means of the electronic card.
- FIGS. 4a-4e The operation of such a corer is illustrated in FIGS. 4a-4e.
- the corer sinks to the bottom as the cable 260 is unwound.
- the speed of descent of the corer is imposed by the winch unwinding the cable 260.
- the control circuit 24 triggers the power supply of the altimeter 22 and the acoustic transducer 25.
- the latter then emits a sound signal S.
- the operator at the surface can then decide to modify the unwinding speed of the cable 260 and in particular to reduce it to minimize the accuracy error due to the difference between the emission of the release command and the actual release of the coring device.
- the corer continues its descent at the speed imposed by the lifting cable 260.
- the control circuit triggers, via the drop module, the release of the coring device which then continues its descent in free fall.
- the control circuit 24 interrupts the power supply of the acoustic transducer or sends an order to stop the transmission of the sound signal, in particular to save the batteries.
- the cable 27 previously coiled then unfolds as the coring device drops. When the tip of the coring device reaches the bottom of the sea F, it sinks into the sediment under the effect of gravity (Figure 4d). The assembly is then reassembled by means of the cables 260 and 27 ( Figure 4e).
- the emission of the acoustic signal by the acoustic transducer 25 is interrupted when the corer reaches the drop altitude or, if this is not reached, after a predetermined time.
- Such a corer has the following advantages: - a launching or deployment operation much simpler and faster than the mechanical system with trigger arm heavy and complicated to adjust;
- the operation is more secure because it can be confirmed (through the sound signal) that the release system is armed;
- the triggering of the release operation is performed at a precise altitude, which can be known a posteriori through the recording of data.
- the invention also relates to a method for controlling a release module.
- the method comprises the following steps:
- step E1 measuring the depth of the coring device with respect to the sea surface and detecting a so-called arming depth
- step E2 when the arming depth is detected, supplying said altimeter with electrical energy
- step E3 measuring the altitude of said coring device with respect to the seabed and detecting a drop altitude
- a sound signal is emitted to the surface at least during step E2.
- This transmission is interrupted in step E4, or, if the drop altitude is not detected, after a predetermined time after detecting the arming depth, to save the batteries of the system.
- control circuit is advantageously configured to stop feeding energy to the altimeter.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geophysics And Detection Of Objects (AREA)
- Underground Or Underwater Handling Of Building Materials (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1760126A FR3072998B1 (fr) | 2017-10-27 | 2017-10-27 | Systeme de largage de tube de carrotage et carrottier comportant un tel systeme |
| PCT/FR2018/052677 WO2019081874A1 (fr) | 2017-10-27 | 2018-10-26 | Systeme de largage de tube de carrotage et carrottier comportant un tel systeme |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP3701115A1 true EP3701115A1 (fr) | 2020-09-02 |
| EP3701115C0 EP3701115C0 (fr) | 2023-06-07 |
| EP3701115B1 EP3701115B1 (fr) | 2023-06-07 |
Family
ID=62528471
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP18803464.9A Active EP3701115B1 (fr) | 2017-10-27 | 2018-10-26 | Système de largage de tube de carrotage et carrottier comportant un tel système |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3701115B1 (fr) |
| FR (1) | FR3072998B1 (fr) |
| WO (1) | WO2019081874A1 (fr) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100507204C (zh) * | 2006-03-20 | 2009-07-01 | 国家海洋局第一海洋研究所 | 天然气水合物深水浅孔保温保压取芯钻具 |
| US8994527B2 (en) * | 2009-03-19 | 2015-03-31 | Galen G. Verhulst | Sea floor sampling device and method |
| AU2010333718A1 (en) * | 2009-12-17 | 2012-08-02 | Scope Engineering (Wa) Pty Ltd | Device for sampling cores from a seabed |
| CN107270897A (zh) * | 2017-06-21 | 2017-10-20 | 青岛东田智能科技有限公司 | 一种重力取样器工作状态测量记录仪 |
-
2017
- 2017-10-27 FR FR1760126A patent/FR3072998B1/fr not_active Expired - Fee Related
-
2018
- 2018-10-26 WO PCT/FR2018/052677 patent/WO2019081874A1/fr not_active Ceased
- 2018-10-26 EP EP18803464.9A patent/EP3701115B1/fr active Active
Also Published As
| Publication number | Publication date |
|---|---|
| FR3072998A1 (fr) | 2019-05-03 |
| WO2019081874A1 (fr) | 2019-05-02 |
| EP3701115C0 (fr) | 2023-06-07 |
| FR3072998B1 (fr) | 2020-09-11 |
| EP3701115B1 (fr) | 2023-06-07 |
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