Offshore seabed crustal stress real-time monitoring system

Abstract

The invention discloses an offshore seabed crustal stress real-time monitoring system which comprises a crustal stress monitoring probe arranged in a seabed drill hole, the crustal stress monitoring probe is connected with a first armored cable, the top end of the first armored cable extends out of the seabed drill hole and is fixedly connected with a sinking block, the sinking block is arranged on the outer side of the seabed drill hole, and the first armored cable is connected with a second armored cable. A seabed drill hole is formed in the ground stress monitoring probe, a sealing piece is arranged on the outer side of the seabed drill hole, an acquisition computer is arranged in the sealing piece, the acquisition computer is electrically connected with the ground stress monitoring probe through a first armored cable, and the sealing piece is connected with a floating piece through a locking and releasing assembly. The submarine ground stress monitoring range is expanded, and the device can be installed on the seabed; the working safety risk of an offshore ground stress monitoring instrument is reduced, and instrument failure is avoided; and the submarine ground stress monitoring cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of geostress monitoring, and in particular to a real-time monitoring system for offshore seabed geostress. Background Art

[0002] Geostress is the stress existing in the earth's crust, that is, the force per unit area inside the medium caused by rock deformation. Geostress research has become one of the key factors in revealing the plate driving mechanism, block interaction and earthquake occurrence process. Block interfaces are in different stress states at different locations. Only through comprehensive stress monitoring can the interaction between blocks be controlled. Geostress measurement and monitoring has attracted widespread attention worldwide, and a series of measurement and monitoring plans have been carried out.

[0003] At present, most of the geophysical monitoring and measurement equipment in the sea area is carried out on islands, and the monitoring equipment is installed on the islands. There are few work plans to install instruments and equipment directly in the seabed boreholes. There are construction plans to use offshore drilling platforms to transform seabed geostress monitoring, but the cost is extremely high. In addition, due to the complexity of the sea surface conditions, there is a risk of failure of monitoring instruments. In order to grasp the distribution of geostress in important coastal areas, a plan for offshore seabed geostress monitoring is needed. Summary of the invention

[0004] The purpose of the present invention is to provide a real-time monitoring system for offshore seabed stress to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a real-time monitoring system for offshore seabed geostress, comprising a geostress monitoring probe arranged in a seabed borehole, the geostress monitoring probe being connected to a first armored cable, the top end of the first armored cable extending outside the seabed borehole and being fixedly connected to a sinker, the sinker being arranged on the outside of the seabed borehole, and a seal being arranged on the outside of the seabed borehole, and an acquisition computer being arranged inside the seal, the acquisition computer being electrically connected to the geostress monitoring probe through the first armored cable, and the seal being connected to a floating member through a locking release assembly.

[0006] Preferably, a trumpet-shaped wellhead is provided at the top of the seabed borehole, and the trumpet-shaped wellhead is provided with a cable anti-wear pad, and the cable anti-wear pad is adapted to the first armored cable; the first armored cable extends out of the seabed borehole from the trumpet-shaped wellhead.

[0007] Preferably, a fixing ring is provided on the top of the sinker, and the first armored cable is fixedly connected to the sinker via the fixing ring.

[0008] Preferably, a battery module is provided inside the sealing member, the battery module is electrically connected to the acquisition computer, and the battery module is used to supply power to the acquisition computer.

[0009] Preferably, a communication module and a positioning module are provided inside the floating component, and the communication module and the positioning module are electrically connected to the battery module via a second armored cable, and the battery module is used to supply power to the communication module and the positioning module.

[0010] Preferably, the length of the first armored cable between the acquisition computer and the sinker is greater than twice the depth of seawater.

[0011] Preferably, the locking and releasing assembly comprises a sonar receiving probe, a fixed bracket and a plastic-coated etched wire; the fixed bracket is fixedly connected to the sonar receiving probe, one end of the plastic-coated etched wire is connected to the fixed bracket, and the other end of the plastic-coated etched wire is connected to the sealing member.

[0012] Preferably, a microcontroller is configured on the plastic-coated and etched broken wire, and the microcontroller is electrically connected to a sonar receiving probe, and the microcontroller is used to accept timing settings of the operator, receive and analyze sonar probe information, monitor the voltage status of the battery module, and control the control signal of the plastic-coated and etched broken wire.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The invention is provided with a ground stress monitoring probe, a sinker, a collection computer, a seal, a floating part and a locking and releasing component; the ground stress monitoring probe is arranged in a seabed borehole; the sinker is arranged outside the seabed borehole, the ground stress monitoring probe is connected with a first armored cable, and the first armored cable is fixedly connected with the sinker; the collection computer is arranged inside the seal, and the collection computer is electrically connected with the ground stress monitoring probe through the first armored cable; the seal is connected with the floating part through the locking and releasing component.

[0015] The present invention expands the monitoring range of seabed geostress and can be installed on the seabed; when the instrument and equipment are working normally, all structures are located on the seabed; the working safety risk of offshore geostress monitoring instruments is reduced, and instrument failure is avoided; the derrick or other wellhead devices are reduced, and the cost of seabed geostress monitoring is reduced; maintenance can be carried out on the sea surface, which reduces maintenance costs, increases the overall working life of the device, and can obtain high-quality continuous data. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of the seabed geostress monitoring system provided in the present invention;

[0017] Figure 2 A schematic diagram of the separation of the sealing component and the floating component of the seabed ground stress monitoring system provided by the present invention;

[0018] Figure 3 This is a schematic diagram of the principle of the submarine geostress monitoring system provided in the present invention;

[0019] Figure 4 This is a schematic diagram of the structure of another seabed stress monitoring system provided in the present invention.

[0020] In the figure: 1. Ground stress monitoring probe; 2. Sinking block; 3. Collection computer; 4. Seal; 5. Floating part; 6. Locking release assembly; 7. First armored cable; 8. Horn wellhead; 9. Seabed drilling hole; 10. Fixing ring; 11. Battery module; 12. Communication module; 13. Positioning module; 14. Second armored cable; 15. Sonar receiving probe; 16. Fixing bracket; 17. Plastic-coated broken wire. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] See also Figure 1 , Figure 2 and Figure 3 The present invention provides a technical solution: a real-time monitoring system for offshore seabed geostress, comprising a geostress monitoring probe 1 arranged in a seabed borehole 9, the geostress monitoring probe 1 being connected to a first armored cable 7, the top of the first armored cable 7 extending to the outside of the seabed borehole 9, and being fixedly connected to a sinker 2, the sinker 2 being arranged on the outside of the seabed borehole 9, and a seal 4 being arranged on the outside of the seabed borehole 9, and a collection computer 3 being arranged inside the seal 4, the collection computer 3 being electrically connected to the geostress monitoring probe 1 through the first armored cable 7, and the seal 4 being connected to a floating member 5 through a locking release assembly 6.

[0023] In the present invention, a trumpet wellhead 8 is provided at the top of the seabed borehole 9, and the trumpet wellhead 8 is equipped with a cable anti-wear pad, and the cable anti-wear pad is adapted to the first armored cable 7; the first armored cable 7 extends out of the seabed borehole 9 from the trumpet wellhead 8.

[0024] Specifically, the ground stress monitoring probe 1 is installed in the seabed borehole 9 and cannot be moved. The first armored cable 7 led out of the ground stress monitoring probe 1 is first fixed to a heavier sinker 2 to prevent the first armored cable 7 from making large reciprocating movements on the seabed. At the same time, a trumpet wellhead 8 is arranged at the entrance of the seabed borehole 9 to guide the first armored cable 7. The trumpet wellhead 8 is equipped with a cable anti-wear pad. The cable anti-wear pad is made of soft material such as a silicone pad to reduce the wear of the first armored cable 7 during work. The first armored cable 7 extends from the trumpet wellhead 8 out of the seabed borehole 9 to facilitate the installation of the ground stress monitoring probe 10 and protect the first armored cable 7 from wear and tear caused by ocean currents.

[0025] In the present invention, a fixing ring 10 is provided on the top of the sinker 2 , and the first armored cable 7 is fixedly connected to the sinker 2 via the fixing ring 10 .

[0026] Specifically, the sinker 2 is usually submerged in the seabed and can be made of lead material. The first armored cable 7 can be wound around or passed through the fixing ring 10, thereby playing the role of limiting the first armored cable 7 through the sinker 2.

[0027] In the present invention, a battery module 11 is provided inside the sealing member 4 , and the battery module 11 is electrically connected to the acquisition computer 3 , and the battery module 11 is used to supply power to the acquisition computer 3 .

[0028] Specifically, the density of the seal 4 is high, and there is a large space inside the seal 4, which can be used to install and arrange the acquisition computer 3 and the battery module 11.

[0029] In the present invention, a communication module 12 and a positioning module 13 are provided inside the floating member 5 . The communication module 12 and the positioning module 13 are electrically connected to the battery module 11 through a second armored cable 14 . The battery module 11 is used to supply power to the communication module 12 and the positioning module 13 .

[0030] Specifically, when the floating component 5 floats to the sea surface, the communication module 12 and the positioning module 13 in the floating component 5 function to timely report to the data management center, so as to facilitate equipment maintenance.

[0031] During the maintenance process, the operating personnel arrive at the floating member 5 and pull the sealing member 4 onto the ship through the second armored cable 14 connected to the floating member 5. After completing the equipment maintenance, the floating member 5 and the sealing member 4 are combined again through the locking release assembly 6 and put back into the sea for work.

[0032] In the present invention, the length of the first armored cable 7 between the acquisition computer 3 and the sinker 2 is greater than twice the depth of the sea water.

[0033] Specifically, the acquisition computer 3 and the battery module 11 are installed on the seabed, and a long first armored cable 7 is reserved between the acquisition computer 3 and the sinker 2. The length of the reserved first armored cable 7 is greater than 2 times the depth of the seawater. After the locking and releasing component 6 is activated, the upper attachment and the sealing component 4 are separated, and the floating component 5 can float to the sea surface. In addition, the battery module 11 can also be regularly awakened by the locking and releasing component 6 to charge or replace it and obtain data.

[0034] In the present invention, the locking release assembly 6 includes a sonar receiving probe 15, a fixed bracket 16 and a plastic-coated etched wire 17; the fixed bracket 16 is fixedly connected to the sonar receiving probe 15, one end of the plastic-coated etched wire 17 is connected to the fixed bracket 16, and the other end of the plastic-coated etched wire 17 is connected to the sealing member 4.

[0035] Specifically, the principle of the locking release component 6 is that the ship on which the operator is riding is equipped with a ship-borne acoustic release unit (deck machine), which emits 8k-12k Hz ultrasonic waves through sonar, and carries the release command to the sonar receiving probe 15 of the floating part 5. The sonar receiving probe 15 converts the acoustic signal into an electrical signal. Since the fixed bracket 16 is firmly connected to the floating part 5, the plastic-coated etched broken wire 17 serves as an anode, and an electrochemical reaction occurs in the environment of seawater electrolyte. Anode: Fe-2e-=Fe2+; cathode: 2H2O+2e-=H2↑+2OH - The plastic-coated broken wire 17 is corroded and broken. The floating member 5 falls off due to the loss of the force bearing fulcrum, floats to the water surface by its own buoyancy, and can be fished out by the operator.

[0036] In the present invention, a microcontroller is configured on the plastic-coated etched broken wire 17, and the microcontroller is electrically connected to the sonar receiving probe 15. The microcontroller is used to accept the operator's timing settings, receive and analyze the sonar probe information, monitor the voltage status of the battery module 11, and control the control signal of the plastic-coated etched broken wire 17.

[0037] The present invention is provided with a geostress monitoring probe 1, a sinker 2, a collection computer 3, a seal 4, a floating part 5 and a locking release assembly 6; the geostress monitoring probe 1 is arranged in a seabed borehole 9; the sinker 2 is arranged outside the seabed borehole 9, the geostress monitoring probe 1 is connected with a first armored cable 7, and the first armored cable 7 is fixedly connected to the sinker 2; the collection computer 3 is arranged inside the seal 4, and the collection computer 3 is electrically connected to the geostress monitoring probe 1 through the first armored cable 7; the seal 4 is connected to the floating part 5 through the locking release assembly 6. The geostress monitoring probe 1 is installed in the seabed borehole 9 and cannot be moved. The first armored cable 7 led out of the geostress monitoring probe 1 is first fixed to a heavier sinker 2 to avoid the first armored cable 7 from moving back and forth on the seabed in a large range. At the same time, a horn wellhead 8 is arranged at the entrance of the seabed borehole 9, which can guide the first armored cable 7 and reduce the wear of the first armored cable 7 during work. The boat on which the operator is riding is equipped with a ship-borne acoustic release unit (deck machine), which emits 8k-12k Hz ultrasonic waves through sonar, and carries the release command to the sonar receiving probe 15 of the floating part 5. The sonar receiving probe 15 converts the acoustic signal into an electrical signal and transmits it to the microcontroller configured with the plastic-coated etched broken wire 17. Since the fixed bracket 16 is fixedly connected to the floating part 5, the plastic-coated etched broken wire 17 acts as an anode, and an electrochemical reaction occurs in the environment of seawater electrolyte, the plastic-coated etched broken wire 17 is corroded and broken, and the floating part 5 falls off due to the loss of the force bearing fulcrum, and floats to the water surface by its own buoyancy 15, and can then be fished by the operator. When the floating part 5 floats to the sea surface, the communication module 12 and the positioning module 13 in the floating part 5 act to promptly report to the data management center, which is convenient for equipment maintenance. During the maintenance process, the operator arrives at the floating member 5, and pulls the seal 4 onto the ship through the second armored cable 14 connected to the floating member 5. After the equipment maintenance is completed, the floating member 5 and the seal 4 are combined again through the locking release assembly 6 and put back into the sea for work. The present invention expands the scope of seabed geostress monitoring and can be installed on the seabed; when the instrument and equipment are working normally, all structures are located on the seabed; the safety risk of offshore geostress monitoring instruments is reduced to avoid instrument failure; the derrick or other wellhead devices are reduced, and the cost of seabed geostress monitoring is reduced; maintenance can be carried out on the sea surface, which reduces maintenance costs, increases the overall working life of the device, and can obtain high-quality continuous data.

[0038] See also Figure 4, based on the disclosure of the above content. The acquisition computer 3 can also be led to the buoy body on the sea surface through a cable, and the buoy body establishes communication with the data center through an antenna to obtain monitoring data. The buoy body is anchored to the seabed by 1-2 anchor chains, and a positioning system is installed on it to report the real-time position to the management center. When the position of the buoy body deviates from the safety range of the seabed borehole 9, a maintenance ship is dispatched to move the anchor chain to reset the position of the buoy body; because there is a joint between the buoy body and the cable line, when the ocean current is large and the position of the buoy body exceeds the position limit of the cable line and is not reset in time, the interface between the buoy body and the instrument is disconnected, and the cable line uses a small float to float on the sea surface waiting for maintenance and reset.

[0039] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in the field. Although the embodiments of the present invention have been shown and described, it is understood by ordinary technicians in this field that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A real-time monitoring system for offshore seabed stress, characterized by: The invention comprises a geostress monitoring probe (1) arranged in a seabed borehole (9), the geostress monitoring probe (1) being connected to a first armored cable (7), the top end of the first armored cable (7) extending outside the seabed borehole (9) and being fixedly connected to a sinker (2), the sinker (2) being arranged outside the seabed borehole (9), a sealing member (4) being arranged outside the seabed borehole (9), and a collection computer (3) being arranged inside the sealing member (4), the collection computer (3) being electrically connected to the geostress monitoring probe (1) via the first armored cable (7), and the sealing member (4) being connected to a floating member (5) via a locking release assembly (6).

2. The real-time monitoring system for offshore seabed stress according to claim 1, characterized in that: A trumpet wellhead (8) is provided at the top of the seabed borehole (9), and the trumpet wellhead (8) is provided with a cable anti-wear pad, and the cable anti-wear pad is adapted to the first armored cable (7); the first armored cable (7) extends out of the seabed borehole (9) from the trumpet wellhead (8).

3. The real-time monitoring system for offshore seabed stress according to claim 1 is characterized in that: A fixing ring (10) is provided on the top of the sinker (2), and the first armored cable (7) is fixedly connected to the sinker (2) via the fixing ring (10).

4. The real-time monitoring system for offshore seabed stress according to claim 1, characterized in that: A battery module (11) is provided inside the sealing member (4), the battery module (11) is electrically connected to the acquisition computer (3), and the battery module (11) is used to supply power to the acquisition computer (3).

5. The real-time monitoring system for offshore seabed stress according to claim 4, characterized in that: A communication module (12) and a positioning module (13) are provided inside the floating component (5); the communication module (12) and the positioning module (13) are electrically connected to the battery module (11) via a second armored cable (14); and the battery module (11) is used to supply power to the communication module (12) and the positioning module (13).

6. The real-time monitoring system for offshore seabed stress according to claim 1, characterized in that: The length of the first armored cable (7) between the acquisition computer (3) and the sinker (2) is greater than twice the depth of the sea water.

7. The real-time monitoring system for offshore seabed stress according to claim 1, characterized in that: The locking and releasing assembly (6) comprises a sonar receiving probe (15), a fixing bracket (16) and a plastic-coated etched wire (17); the fixing bracket (16) is fixedly connected to the sonar receiving probe (15), one end of the plastic-coated etched wire (17) is connected to the fixing bracket (16), and the other end of the plastic-coated etched wire (17) is connected to the sealing member (4).

8. The real-time monitoring system for offshore seabed stress according to claim 7, characterized in that: The plastic coated etched broken wire (17) is provided with a microcontroller, and the microcontroller is electrically connected to the sonar receiving probe (15).

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