CN114323124A - Underwater superficial stratum information monitoring network system for seabed hydrate dune - Google Patents
Underwater superficial stratum information monitoring network system for seabed hydrate dune Download PDFInfo
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 28
- 238000011065 in-situ storage Methods 0.000 claims abstract description 35
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- 239000000523 sample Substances 0.000 claims abstract description 21
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 15
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Abstract
The invention relates to an underwater superficial stratum information monitoring technology, and aims to provide an underwater superficial stratum information monitoring network system for a seabed hydrate dome. The system comprises a submarine topography deformation in-situ detection sensor network and a submarine stratum multi-parameter in-situ detection sensor network; the former comprises a plurality of flexible linear sensing arrays with a plurality of cascade MEMS attitude sensors; the sensor node comprises a plurality of flexible probe rod type sensor nodes, an MEMS methane gas sensor at the head part, a stainless steel conical head at the tail end, a plurality of sealed pressure-resistant cabins at the middle part, and an MEMS temperature sensor, an MEMS pore pressure sensor and two MEMS attitude sensors which are vertical to each other are packaged in a cabin body. The invention provides a multi-type and multi-level sensor network system which can directly observe a plurality of in-situ parameters of a sea bottom hydrate dune area, and the acquired space-time sequence data can provide basic data for the research of the shape evolution mechanism of the sea bottom hydrate dune.
Description
Technical Field
The invention relates to the technical field of underwater superficial stratum information monitoring, in particular to an underwater superficial stratum information monitoring network system for a seabed hydrate dome.
Background
With the importance of various countries on the development of ocean resources, the existence of seabed shallow hydrates has wide prospect and profound significance for realizing the development and utilization of shallow blocky high-saturation hydrates.
A subsea hydrate dune is a special subsea structure that changes in appearance from a smooth, perfectly round, steep dune to a rough, slopping dune. On a seismic section, the interior of the seismic section often appears as blank reflections and is closely related to the bottom-like reflections. Comprehensive research analysis suggests that large scale subsea hydrate domes typically form near high flux convergent flow channels. The presence of a sea-bottom hydrate dome may be indicative of the presence of lower hydrates and reservoirs and the migration of continental-edge-pooling fluids. Meanwhile, deep heat flow and high salinity water with upward migration of fluid may lead to shallower BSR depths under convergent fluid migration conditions. In addition, the formation and development of the hydrate dune are dynamic processes, gas of the hydrate dune formed in the open type flow system is derived from external fluid percolating from deep sediments, hydrate mineral products with large scale and high saturation can be formed, and the method has exploration value. Therefore, the hydrate dome has an important indication effect on the occurrence of the shallow hydrate, and the morphological characteristics of the hydrate dome are closely related to the formation and decomposition of the shallow hydrate, so that the research on the shape evolution mechanism of the hydrate dome is the basis of future resource development and application.
At present, because the submarine hydrate dune is located in a special high-pressure and low-temperature environment of a submarine hydrate development area, the submarine hydrate dune is limited by the existing observation technical conditions, the research on the submarine hydrate dune is not deep enough, the in-situ long-term three-dimensional monitoring on the hydrate dune state cannot be realized, the research on the shape evolution mechanism and the in-situ monitoring technology is still in a blank state, and a special targeted monitoring technology is also lacked.
In summary, the existing monitoring network system for exploring the evolution mechanism of the deep-sea hydrate dome and detecting in situ has some defects, so that a set of sensing network monitoring system for the natural gas hydrate dome is constructed, the requirements for obtaining the morphological change of the natural gas hydrate dome, the information of a shallow stratum, temperature information, gas emission and the like are met, stable and reliable long-term observation data can be provided, the development of the seabed hydrate dome and the deformation evolution mechanism of the shallow stratum hydrate are researched, and the defects are overcome.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects in the prior art and provides an underwater superficial stratum information monitoring network system for a seabed hydrate dome.
In order to solve the technical problem, the solution of the invention is as follows:
the underwater superficial stratum information monitoring network system for the seabed hydrate dune comprises a seabed terrain deformation in-situ detection sensing network and a seabed stratum multi-parameter in-situ detection sensing network which are respectively connected to a controller through cables; wherein,
the submarine topography deformation in-situ detection sensing network comprises a plurality of flexible linear sensing arrays, and each sensing array has the structure as follows: sequentially arranging a plurality of sealed pressure-resistant capsule bodies in a watertight oil-filled hose at medium distance, and respectively packaging an MEMS attitude sensor in each capsule body; the adjacent cabin bodies are connected through watertight connectors to realize sensor cascade connection;
the multi-parameter in-situ detection sensing network for the seabed stratum comprises a plurality of flexible probe rod type sensor nodes, and each sensor node has the structure as follows: the device comprises an MEMS methane gas sensor and a plurality of sealed pressure-resistant cabin bodies which are sequentially arranged, wherein an MEMS temperature sensor, an MEMS pore pressure sensor and two mutually vertical MEMS attitude sensors are packaged in each cabin body; a stainless steel corrugated pipe is arranged between the adjacent cabin bodies, and the two ends of the stainless steel corrugated pipe are connected with the cabin bodies at the two ends through watertight corrugated joints; a cable connected with the watertight corrugated joint is arranged inside the stainless steel corrugated pipe and used for signal transmission of the sensor; and a stainless steel conical head is arranged at the extreme end of the sensor node.
Preferably, the end of the watertight oil-filled hose is provided with a handle.
Preferably, a plurality of relays are arranged in the controller, and each relay is electrically connected with the flexible linear sensing array and the flexible probe rod type sensor node in a one-to-one correspondence manner.
As a preferred scheme, data acquisition cards are respectively arranged in the submarine topography deformation in-situ detection sensing network and the submarine stratum multi-parameter in-situ detection sensing network, and the data acquisition cards are respectively connected with the controller, the flexible linear sensing array and the flexible probe rod type sensor node through cables.
As a preferred scheme, the data acquisition card is connected with the controller, the flexible linear sensing array and the flexible probe rod type sensor node through RS485 communication connecting lines, so that data of each sensor is acquired and transmitted.
Preferably, the data acquisition card is provided with a data storage card for storing the acquired data.
Preferably, the system also comprises a power supply, and the controller and the power supply are packaged in the sealed pressure-resistant cabin body and are connected with the two detection sensing networks through watertight connectors.
Preferably, the power source is a battery.
Compared with the prior art, the invention has the beneficial effects that:
1. the monitoring system can realize long-term, in-situ and three-dimensional observation of the seabed hydrate dune and provides technical support for development of seabed shallow hydrate and research on deformation of terrain and stratum.
2. The self-contained in-situ monitoring system is adopted, so that the problem that data cannot be transmitted in real time in the sea area in-situ monitoring process under severe sea conditions is solved, and the cost of applying a complex monitoring system is reduced.
2. The invention provides a multi-type and multi-level sensor network system which can directly observe a plurality of in-situ parameters of a seabed hydrate dune area, including a terrain formation deformation amount, a methane leakage amount, a temperature and a formation pore water pressure, and the acquired space-time sequence data can provide basic data for the research of the shape evolution mechanism of the seabed hydrate dune.
3. The invention can arrange different sensing array types and structures on the surface of the sea bottom hydrate dune and a shallow stratum respectively, and finally form a three-dimensional multi-parameter sea bottom hydrate dune monitoring sensing network.
4. The device is laid to a designated hydrate dune area on the seabed with the assistance of a scientific research ship and an ROV, and is recovered with the assistance of the ROV after an observation task is completed.
Drawings
FIG. 1 is a schematic diagram of the implementation principle of the present invention;
FIG. 2 is a partial schematic view of the present invention;
FIG. 3 is an exemplary flow chart of the operation of the controller of the present invention;
FIG. 4 is a top view of an exemplary application of a submarine topography deformation in-situ detection sensor network;
FIG. 5 is a cross-sectional view of an example of an application of a multi-parameter in-situ detection sensor network for a subsea formation.
In the figure, 1-a controller, 2-an acquisition board, 3-RS485 communication connecting lines, 4-MEMS attitude sensors, 5-MEMS methane gas sensors, 6-MEMS temperature sensors, 7-MEMS pore pressure sensors, 8-pressure sensor probes, 9-temperature sensor probes, 10-cables, 11-sealed cabin pressure resistance, 12-stainless steel corrugated pipes, 13-watertight corrugated connectors, 14-stainless steel conical heads, 15-watertight oil-filled hoses, 16-a controller and power supply, 17-an underwater winch, 18-a data acquisition card and 19-natural gas hydrate.
Detailed Description
The following examples are presented to enable those skilled in the art to more fully understand the present invention and are not intended to limit the invention in any way.
As shown in fig. 1 and 2, the underwater superficial stratum information monitoring network system for the seabed hydrate dome of the invention comprises two detection sensing networks, namely a seabed terrain deformation in-situ detection sensing network and a seabed stratum multi-parameter in-situ detection sensing network which are respectively connected to a controller 1 through cables 10.
The submarine topography deformation in-situ detection sensing network comprises a plurality of flexible linear sensing arrays, and each sensing array has the structure as follows: a plurality of sealed pressure-resistant capsule bodies are sequentially arranged in the watertight oil-filled hose 15 at equal distances, and an MEMS attitude sensor 4 (such as an MEMS nine-axis attitude sensor) is respectively packaged in each capsule body; the adjacent cabin bodies are connected through watertight connectors to realize sensor cascade connection; the end of the watertight oil-filled hose 15 is provided with a handle.
The multi-parameter in-situ detection sensing network for the seabed stratum comprises a plurality of flexible probe rod type sensor nodes, and each sensor node has the structure as follows: the device comprises an MEMS methane gas sensor 5 and a plurality of sealed pressure-resistant cabin bodies 11 which are sequentially arranged, wherein an MEMS temperature sensor 6, an MEMS pore pressure sensor 7 and two MEMS attitude sensors 4 which are vertical to each other are packaged in each cabin body; in order to meet the sensing requirements of temperature and pore pressure, a pressure sensor probe 8 and a temperature sensor probe 9 are arranged on the outer side of a sealed pressure-resistant cabin body 11 and are respectively connected with an MEMS temperature sensor 6 and an MEMS pore pressure sensor 7 in the cabin body through signal lines; a stainless steel corrugated pipe 12 is arranged between the adjacent cabin bodies, and two ends of the stainless steel corrugated pipe 12 are connected with the cabin bodies at two ends through watertight corrugated joints 13; a cable connected with a watertight corrugated joint 13 is arranged inside the stainless steel corrugated pipe 12 and is used for signal transmission of the sensor; at the extreme end of the sensor node, a stainless steel conical head 14 is provided.
The two detection sensor networks are respectively provided with a data acquisition card 18, and the controller 1 is respectively connected with each flexible linear sensor array and the flexible probe rod type sensor node through a cable 10 and a plurality of data acquisition cards 18. The controller 1 is provided with a plurality of relays, and each relay is electrically connected with the data acquisition card 18 in a one-to-one correspondence manner. The data acquisition card 18 and the controller 1, the flexible linear sensing array and the flexible probe rod type sensor node are communicated in an RS485 mode, namely the data acquisition card 18 and the controller 1, the flexible linear sensing array and the flexible probe rod type sensor node are connected through an RS485 communication connecting line 3, so that data acquisition and transmission of each sensor are realized. The data acquisition card 18 is provided with a data storage card for storing the acquired data.
The system also comprises a power supply, and a storage battery such as an optional lithium battery. As shown in fig. 2, the controller and the power supply 16 are packaged in a sealed pressure-resistant cabin (loaded in a subsea winch 17), and are connected with the submarine topography deformation in-situ detection sensor network and the submarine stratum multi-parameter in-situ detection sensor network through watertight connectors.
More detailed description:
in the invention, the submarine topography deformation in-situ detection sensor network and the submarine stratum multi-parameter in-situ detection sensor network form a three-dimensional monitoring sensor network system for the submarine hydrate dome surface and the stratum.
The monitoring network system is composed of a plurality of sensing arrays and comprises flexible linear sensing arrays and flexible probe rod type sensor nodes. The flexible linear sensing array arranged on the surface of the sea bottom mainly comprises MEMS attitude sensors 4 which are arranged at equal intervals.
The flexible probe rod type sensor node vertically inserted into the stratum consists of various sensors, and can realize in-situ observation of multiple parameters of the stratum. The MEMS methane gas sensor 5 is positioned at the topmost end of the flexible probe rod type sensor node and used for monitoring the change of methane flux on the seabed surface. Each pressure-resistant cabin body comprises a temperature sensor, a pore pressure sensor and two mutually perpendicular attitude sensors, and the synchronous monitoring of the formation temperature, the pore water pressure and the deformation can be realized. The pressure-resistant cabins are connected through corrugated pipes and steel wires, the formation multi-parameter array can be smoothly inserted into the formation without influencing the monitoring performance of the array, and the adjacent pressure-resistant cabins are connected through watertight corrugated joints, so that data transmission and power supply are guaranteed.
The MEMS attitude sensor 4 can be selected as a 9-axis sensor, comprises a three-axis accelerometer, a three-axis gyroscope and a three-axis magnetometer, can acquire data of acceleration, angular velocity and magnetic field intensity, is packaged and configured with a signal conversion module in the sensor, displays the data into a data form of Euler angles or quaternions, and is convenient to store and convert.
An RS485 communication mode is adopted between the sensor array and the data acquisition card 18, and each sensor node has a unique RS485 physical address. The data acquisition card 18 acquires data of sensor nodes on the sensor array through an RS485 bus in an address query mode, and stores the data into a storage card (such as an SD card).
The controller 1 can select a single chip microcomputer as a control chip, and the on-off control of the single chip microcomputer on the plurality of relays is realized, so that the start-stop control of the data acquisition card 18 is realized, the synchronous work of multiple acquisition is realized, and the time synchronism of the data of the sensing array is ensured.
Example of the method of use:
after the whole system is laid in situ by the underwater winch 17, the handle at the tail end of the watertight oil-filled hose 15 is pulled by an operation type underwater Robot (ROV), the flexible linear sensing array is pulled out and laid on the surface of the sea bottom, the flexible probe rod type sensor node is inserted into the underwater superficial stratum, and the MEMS methane gas sensor 5 is ensured to be exposed out of the ground surface.
As shown in fig. 4, in the contour topographic map, 8 flexible linear sensor arrays are distributed on the seabed surface, and are distributed in the four directions of east, south and north, and the directions of north, south, east and south. As shown in FIG. 5, in the cross section of the sea bottom hydrate dome, the flexible probe sensor nodes are arranged at equal intervals and the penetration depth is about 3 m.
The synchronous acquisition is carried out under the control of the controller 1 and the data acquisition card 18, the acquisition is carried out once every 24 hours, and the sensor network data is continuously acquired for 10 minutes every time. Thus, the three-dimensional monitoring of the hydrate dome is completed, an accurate in-situ monitoring and sensing network system for each parameter of the earth surface and the stratum of the sea-bottom hydrate dome region is established, and a three-dimensional reconstruction model of the shape evolution of the sea-bottom hydrate dome is established; the monitoring and prediction of the shape of the sea-bottom hydrate mound and the deformation of the shallow hydrate are realized, and the basic work is made for the development and comprehensive utilization of the natural gas hydrate in the relevant area.
It should be understood that the above description is only exemplary of the preferred embodiments of the present invention, and is not intended to limit the present invention, and that any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A submarine superficial stratum information monitoring network system aiming at a submarine hydrate dune is characterized by comprising a submarine topography deformation in-situ detection sensing network and a submarine stratum multi-parameter in-situ detection sensing network which are respectively connected to a controller through cables; wherein,
the submarine topography deformation in-situ detection sensing network comprises a plurality of flexible linear sensing arrays, and each sensing array has the structure as follows: sequentially arranging a plurality of sealed pressure-resistant capsule bodies in a watertight oil-filled hose at medium distance, and respectively packaging an MEMS attitude sensor in each capsule body; the adjacent cabin bodies are connected through watertight connectors to realize sensor cascade connection;
the multi-parameter in-situ detection sensing network for the seabed stratum comprises a plurality of flexible probe rod type sensor nodes, and each sensor node has the structure as follows: the device comprises an MEMS methane gas sensor and a plurality of sealed pressure-resistant cabin bodies which are sequentially arranged, wherein an MEMS temperature sensor, an MEMS pore pressure sensor and two mutually vertical MEMS attitude sensors are packaged in each cabin body; a stainless steel corrugated pipe is arranged between the adjacent cabin bodies, and the two ends of the stainless steel corrugated pipe are connected with the cabin bodies at the two ends through watertight corrugated joints; a cable connected with the watertight corrugated joint is arranged inside the stainless steel corrugated pipe and used for signal transmission of the sensor; and a stainless steel conical head is arranged at the extreme end of the sensor node.
2. The system of claim 1, wherein the end of the water-tight oil-filled hose is provided with a handle.
3. The system of claim 1, wherein a plurality of relays are provided in the controller, each relay being electrically connected to a flexible linear sensor array and a flexible probe-type sensor node in a one-to-one correspondence.
4. The system according to claim 1, wherein a data acquisition card is respectively arranged in the submarine topography deformation in-situ detection sensor network and the submarine stratum multi-parameter in-situ detection sensor network, and the data acquisition cards are respectively connected with the controller, the flexible linear sensor array and the flexible probe rod type sensor nodes through cables.
5. The system of claim 4, wherein the data acquisition card is connected with the controller, the flexible linear sensor array and the flexible probe rod type sensor node through RS485 communication connection lines to acquire and transmit data of each sensor.
6. The system according to claim 4, wherein the data acquisition card is provided with a data storage card for storing the acquired data.
7. The system of claim 1, further comprising a power source, wherein the controller and the power source are enclosed in a sealed pressure-resistant enclosure and connected to the two detection sensor networks by watertight connectors.
8. The system of claim 7, wherein the power source is a battery.
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- 2021-12-14 CN CN202111527651.2A patent/CN114323124A/en active Pending
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| JP2004271326A (en) * | 2003-03-07 | 2004-09-30 | Taisei Corp | Seabed behavior measurement system |
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Application publication date: 20220412 |