Three-component electromagnetic response receiving probe rod in deep sea seabed hole

Abstract

The invention belongs to the field of deep sea sulfide exploration, and particularly relates to a deep sea seabed in-hole three-component electromagnetic response receiving probe rod which comprises a head end pressure-bearing bin, a tail end pressure-bearing bin, a connecting shaft, a three-component electromagnetic receiving probe, a nonmagnetic titanium alloy shell, a receiving unit and a fixing structure of a receiving circuit and a battery. Wherein the three-component electromagnetic receiving probe comprises a Z-axis electromagnetic receiving part and an X-Y-axis electromagnetic receiving part which are sequentially arranged on the periphery of a connecting shaft in a sleeving manner, and the non-magnetic titanium alloy shell is arranged on the outer side of the three-component electromagnetic receiving probe; the two ends of the connecting shaft are used for connecting the head-end pressure-bearing bin and the tail-end pressure-bearing bin; and the receiving unit is a sheet-shaped circuit, is mounted on a fixing structure of the receiving circuit and the battery, and is integrally arranged in the head end pressure-bearing cabin or the tail end pressure-bearing cabin. The device is small in radial size, is suitable for a long-term in-situ detection environment of a deep-sea small drill hole, and can realize high-resolution and long-term in-situ survey of deep-sea sulfide.

Description

Technical Field

[0001] The present invention belongs to the field of deep-sea sulfide exploration, and specifically relates to a three-component electromagnetic response receiving probe rod in a deep-sea seabed hole. Background Art

[0002] Seafloor hydrothermal sulfide deposits, also known as polymetallic sulfides or seafloor giant sulfides, constitute a unique seafloor metal mineral resource. These deposits are mainly composed of sulfide and sulfate minerals rich in metal elements erupted from high-temperature black chimneys on the seafloor. The deposits are rich in basic metal elements such as iron (Fe), copper (Cu), lead (Pb), and zinc (Zn), and may become a substitute for terrestrial resources in the future and have attracted much attention. However, the current seafloor sulfide exploration methods generally have complex instrumentation, high exploration costs, and the inability to complete deep-sea drilling exploration. In order to overcome the technical difficulties of small aperture, high resolution, and long-term in-situ observation of seafloor drilling rigs, it is necessary to study a three-component electromagnetic response receiving probe in a deep-sea seafloor hole.

[0003] Chinese patent CN101571599A discloses a magnetic detection system for detecting hydrothermal sulfides on the deep seabed, including a pressure-resistant shell and a probe sensor encapsulated therein, wherein the probe sensor is composed of three mutually perpendicular fluxgate sensors, and the pressure-resistant shell is composed of a cylinder and a front cover and a rear cover for sealing both ends of the cylinder. However, the instrument is too large and can only be used for seabed exploration, and cannot meet the requirements of seabed drilling exploration.

[0004] Chinese patent CN111983697A discloses a seabed electric field detection device for underwater robots and a method for detecting polymetallic sulfides. The three components of the seabed electric field are measured by three sets of electric field sensors in three directions, and the negative anomaly in the natural potential field is used to determine whether polymetallic sulfides exist on the seabed. However, the instrument is suitable for large-area scanning of the seabed, and is not suitable for high-resolution in-situ detection of sulfides. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a three-component electromagnetic response receiving probe in a deep-sea seabed hole, which solves the problem that the existing technology is not suitable for the exploration environment of small seabed boreholes and is not suitable for high-resolution in-situ detection of sulfides.

[0006] The present invention is achieved in this way. A three-component electromagnetic response receiving probe in a deep-sea seabed hole, comprising: a head end pressure-bearing chamber, a tail end pressure-bearing chamber, a connecting shaft, a three-component electromagnetic receiving probe, a non-magnetic titanium alloy shell, a receiving unit, and a receiving circuit and a battery fixing structure; wherein the three-component electromagnetic receiving probe comprises a Z-axis electromagnetic receiving part and an XY-axis electromagnetic receiving part which are sequentially sleeved on the periphery of the connecting shaft, and the non-magnetic titanium alloy shell is arranged on the outside of the three-component electromagnetic receiving probe; the two ends of the connecting shaft are used to connect the head end pressure-bearing chamber and the tail end pressure-bearing chamber; the receiving unit is a sheet circuit, which is installed on the receiving circuit and the battery fixing structure, and is placed as a whole inside the head end pressure-bearing chamber or the tail end pressure-bearing chamber.

[0007] Furthermore, the Z-axis electromagnetic receiving part includes a Z-axis core and annular partitions arranged at both ends and in the middle of the Z-axis core, dividing the Z-axis core into two symmetrical grooves, and winding coils in the two grooves to form a differential Z-axis electromagnetic receiving coil.

[0008] Furthermore, the XY-axis electromagnetic receiving part includes an XY-axis core and four T-shaped bars protruding from the surface of the XY-axis core and symmetrically arranged along the direction of the XY-axis core, wherein the top surface of the T-shaped bar is an arc-shaped surface, and an I-shaped groove is formed between the arc-shaped surface and the surface of the XY-axis core; induction coils are wound in two symmetrical I-shaped grooves to form a differential X-axis electromagnetic receiving coil; and induction coils are wound in the other two symmetrical I-shaped grooves to form a differential Y-axis electromagnetic receiving coil.

[0009] Furthermore, the fixing structure of the receiving circuit and the battery includes a cylindrical battery compartment arranged at one end, a plurality of battery mounting holes are arranged in parallel in the cylindrical battery compartment, and an arc-shaped receiving circuit mounting compartment arranged at the other end for fixing the receiving unit.

[0010] Furthermore, both ends of the connecting shaft are connected to the head-end pressure-bearing bin or the tail-end pressure-bearing bin through end covers, the end cover has a hole in the middle, one end is connected to the connecting shaft through a thread, and the other end is provided with an O-type pressure-resistant sealing ring placement groove on the outer surface, and after being inserted into the head-end pressure-bearing bin or the tail-end pressure-bearing bin, it is fixed to the head-end pressure-bearing bin or the tail-end pressure-bearing bin through a raised ring flange provided on the end cover.

[0011] Furthermore, the non-magnetic titanium alloy shell wraps the three-component electromagnetic receiving probe and part of the end cover, and glue is poured into the non-magnetic titanium alloy shell.

[0012] Compared with the prior art, the present invention has the following beneficial effects: the present invention has a smaller radial dimension, is suitable for long-term in-situ detection environments of small deep-sea boreholes, and can achieve high-resolution, long-term in-situ surveys of deep-sea sulfides. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 An exploded diagram of the structure of a three-component electromagnetic response receiving probe rod in a deep-sea seabed hole provided by an embodiment of the present invention; Figure 2 A schematic diagram of the structure of an XY-axis electromagnetic receiving part provided by an embodiment of the present invention; Figure 3 A schematic diagram of the structure of a Z-axis electromagnetic receiving part provided by an embodiment of the present invention; Figure 4 A schematic structural diagram of a first end cover provided in an embodiment of the present invention; Figure 5 A schematic diagram of the structure of a second end cover provided in an embodiment of the present invention; Figure 6 A schematic diagram of the structure of the tail end pressure chamber provided by an embodiment of the present invention; Figure 7 A schematic diagram of the structure of a connecting shaft provided in an embodiment of the present invention; Figure 8 A schematic diagram of the structure of the head end pressure chamber provided in an embodiment of the present invention; Fig. 9 A schematic structural diagram of a receiving circuit and a battery fixing structure provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0014] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0015] See also Figure 1A three-component electromagnetic response receiving probe rod in a deep-sea seabed hole specifically includes: a head end pressure-bearing chamber 10, a tail end pressure-bearing chamber 1, a connecting shaft 4, a three-component electromagnetic receiving probe, a non-magnetic titanium alloy shell 6, a receiving unit 9, and a fixing structure 8 for a receiving circuit and a battery. Among them, the receiving unit 9 is installed on the fixing structure 81 of the receiving circuit and the battery, and the fixing structure of the receiving circuit and the battery includes a cylindrical battery compartment 82 arranged at one end, a plurality of battery mounting holes are arranged in parallel in the cylindrical battery compartment, and an arc-shaped receiving circuit mounting compartment is arranged at the other end, so as to realize the fixation and protection of the lithium battery; the fixing structure 8 of the receiving circuit and the battery is installed in the head-end pressure-bearing compartment 10, and the three-component electromagnetic receiving probe includes a Z-axis electromagnetic receiving part 3 and an XY-axis electromagnetic receiving part 5 which are sequentially sleeved on the periphery of the connecting shaft, and a non-magnetic titanium alloy shell 6 is placed on the outside of the three-component electromagnetic receiving probe; the two ends of the connecting shaft are respectively connected to the head-end pressure-bearing compartment 10 and the tail-end pressure-bearing compartment 1 through the first end cover 7 and the second end cover 2; the first end cover 7 is assembled with the head-end pressure-bearing compartment 10 to realize the pressure protection of the receiving unit 9. Protection; the Z-axis electromagnetic receiving part 3 and the XY-axis electromagnetic receiving part 5 are sleeved on the outside of the connecting shaft 4 to fix and support the three-component electromagnetic receiving probe. The connecting shaft 4 is also used for the mechanical connection between the second end cover 2 and the first end cover 7. The connecting shaft 4 is an important component for connecting and supporting the various parts of the three-component electromagnetic response receiving probe in a deep-sea seabed hole; the high-strength non-magnetic titanium alloy shell 6 is used to protect the Z-axis electromagnetic receiving part 3 and the XY-axis electromagnetic receiving part 5. The non-magnetic titanium alloy shell 6 is filled with epoxy resin glue to achieve the curing of the Z-axis electromagnetic receiving part 3 and the XY-axis electromagnetic receiving part 5, protect the electrical part from seawater erosion, and provide sufficient strength to ensure the deep-sea pressure-resistant operation of the three-component electromagnetic receiving part; the second end cover 2 and the tail end pressure-bearing chamber 1 are assembled for pressure protection of other circuits.

[0016] See also Figure 2 , the XY axis electromagnetic receiving part includes: The XY-axis electromagnetic receiving part 5 includes an XY-axis core 55 and four T-shaped bars protruding from the surface of the XY-axis core 55 and symmetrically arranged along the direction of the XY-axis core 55. The four T-shaped bars have the same structure and are marked as a first T-shaped bar 51, a second T-shaped bar 52, a third T-shaped bar 53 and a third T-shaped bar 54, respectively. The first T-shaped bar 51 is symmetrical to the third T-shaped bar 53, and the second T-shaped bar 52 is symmetrical to the third T-shaped bar 54. The top surfaces of the four T-shaped bars are arc-shaped surfaces, and an I-shaped groove is formed between the surface of the XY-axis core 55; two symmetrical I-shaped grooves are wound around the top surfaces of the four T-shaped bars. The coil forms a differential Y-axis electromagnetic receiving coil; the other two symmetrical I-shaped grooves are wound with induction coils to form a differential X-axis electromagnetic receiving coil, the groove of the first T-shaped bar 51 is wound with the induction coil in a clockwise (or counterclockwise) direction, and the groove of the third T-shaped bar 53 is wound with the induction coil in a counterclockwise (or clockwise) direction, and the middle tap of the two induction coils is used as a balanced end, and the outputs of both ends are sent to the subsequent circuit as differential signals to form a differential X-axis electromagnetic receiving coil for receiving the differential signal of the X-axis component; the differential Y-axis electromagnetic receiving coil is made in the same way as the X-axis. The subsequent circuit refers to the receiving unit 9.

[0017] See also Figure 3 The Z-axis electromagnetic receiving part 3 includes a Z-axis core and an annular partition 33 arranged at both ends and in the middle of the Z-axis core, dividing the core into two symmetrical grooves, marked as a first groove 31 and a second groove 32 respectively, and coils are wound in the two grooves to form a differential Z-axis electromagnetic receiving coil. The differential Z-axis electromagnetic receiving coil includes a first Z-axis induction coil wound in the first groove 31 and a second Z-axis induction coil wound in the second groove 32, forming a differential Z-axis electromagnetic receiving coil for receiving the differential signal of the Z-axis component.

[0018] See also Figure 4 The first end cover 7 includes: a first O-type pressure-resistant sealing ring placement groove 71 is set at one end of the first end cover 7, the first end cover 7 and the first end pressure-bearing chamber 10 are sealed by the first O-type pressure-resistant sealing ring, and an electrical connection wiring hole 72 is set in the axial direction of the first end cover 7. The connection line between the receiving unit 9 and the XY-axis electromagnetic receiving part 5 and the Z-axis electromagnetic receiving part 3 passes through the electrical connection wiring hole 72, a raised ring flange 73 is set on the first end cover 7, and a plurality of end cover pressing threaded holes are evenly set on the raised ring flange 73. One end of the first end cover 7 is threadedly connected to the connecting shaft through an internal thread, and the other end is pressure-resistantly connected to the first end pressure-bearing chamber 10 through the first O-type pressure-resistant sealing ring, and is fixed to the first end pressure-bearing chamber 10 through the threaded hole bolts on the raised ring flange 73.

[0019] See also Figure 5The second end cover 2 includes: a second O-type pressure-resistant sealing ring placement groove 21 is set at one end of the second end cover 2; the structure is the same as the first end cover 7, and it also includes a raised ring flange set on the second end cover 2, and a plurality of end cover clamping threaded holes 22 are evenly set on the raised ring flange. The end cover clamping threaded holes 22 are 8 M3 threaded holes, so that the second end cover 2 and the tail end pressure chamber 1 are tightly matched together; the central threaded hole 23 set inside the other end is used for the mechanical connection between the second end cover 2 and the connecting shaft 4.

[0020] See also Figure 6 The tail end pressure-bearing bin 1 is a hollow structure, including: a threaded hole 11 is installed on the end surface of the tail end pressure-bearing bin, so that the second end cover 2 is tightly matched with the tail end pressure-bearing bin; See also Figure 7 The connecting shaft 4 is a hollow structure, and a connecting shaft electrical wiring hole 41 is opened on the side of the connecting shaft, which is used for the induction coil in the three-component electromagnetic receiving probe to pass through the connecting shaft electrical wiring hole 41 into the hollow interior of the connecting shaft 4 and then be electrically connected to the receiving unit 9; the outer surfaces of both ends of the connecting shaft 4 are provided with connecting shaft threads 42, which are used for the mechanical connection between the connecting shaft 4 and the end cover.

[0021] See also Figure 8 The first end pressure chamber 1 is a hollow cylindrical structure, and a connection thread 101 with other components is arranged on the outer surface of one end. An end surface mounting threaded hole is arranged on the end surface of the other end.

[0022] See also Fig. 9 As shown, the receiving circuit and battery fixing structure 8 includes a cylindrical battery compartment arranged at one end, a plurality of battery mounting holes 82 are arranged in parallel in the cylindrical battery compartment, and an arc-shaped receiving circuit mounting compartment 81 is arranged at the other end for fixing the receiving unit 9. The end of the arc-shaped receiving circuit mounting compartment 81 is arranged as a circular ring structure, which is used to place the receiving circuit and battery fixing structure 8, and send the circuit and battery fixing structure 8 into or pull out the head end pressure-bearing compartment 10 or the tail end pressure-bearing compartment 1 through the end.

[0023] In order to verify the feasibility of the proposed three-component electromagnetic receiving probe in deep-sea boreholes, a test prototype was built and an indoor water tank experiment was carried out.

[0024] In order to test the receiving effect and sealing performance of the three-component electromagnetic response receiving probe, sea salt is added to the indoor water tank to simulate the conductivity of seawater. The three-component electromagnetic response receiving probe is placed in the water tank, and the transmitter transmits a multi-frequency pseudo-random signal through the three-axis transmitting coil. The signal enters the three-axis receiving coil through the seawater with low resistivity. The voltage signal induced by the three-component electromagnetic probe is processed and stored by the receiving unit 9. The collected data is subjected to frequency analysis, and the receiving frequency is normal, which shows that the three-component electromagnetic response receiving probe has a good receiving effect. At the same time, the sealing chamber has good sealing performance, which meets the requirements of underwater detection.

[0025] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A three-component electromagnetic response receiving probe in a deep seabed hole, characterized in that: include: A head end pressure-bearing chamber (10), a tail end pressure-bearing chamber (1), a connecting shaft (4), a three-component electromagnetic receiving probe, a non-magnetic titanium alloy shell (6), a receiving unit (9), and a receiving circuit and a battery fixing structure (8); wherein the three-component electromagnetic receiving probe comprises a Z-axis electromagnetic receiving part (3) and an XY-axis electromagnetic receiving part (5) which are sequentially sleeved on the periphery of the connecting shaft (4), and the non-magnetic titanium alloy shell (6) is arranged on the outside of the three-component electromagnetic receiving probe; the two ends of the connecting shaft (4) are used to connect the head end pressure-bearing chamber (10) and the tail end pressure-bearing chamber (1); the receiving unit (9) is a sheet circuit, which is installed on the receiving circuit and a battery fixing structure (8), and is placed as a whole inside the head end pressure-bearing chamber (10) or the tail end pressure-bearing chamber (1).

2. A three-component electromagnetic response receiving probe in a deep seabed hole according to claim 1, characterized in that: The Z-axis electromagnetic receiving part (3) comprises a Z-axis core and annular partitions (22) arranged at both ends and in the middle of the Z-axis core, dividing the Z-axis core into two grooves of symmetrical structure, and winding coils in the two grooves to form a differential Z-axis electromagnetic receiving coil.

3. A three-component electromagnetic response receiving probe in a deep seabed hole according to claim 1, characterized in that: The XY-axis electromagnetic receiving part (5) comprises an XY-axis core (55) and four T-shaped bars symmetrically arranged along the direction of the XY-axis core (55) and protruding from the surface of the XY-axis core (55); the top surface of the T-shaped bar is an arc-shaped surface, and an I-shaped groove is formed between the arc-shaped surface and the surface of the XY-axis core (55); induction coils are wound in two symmetrical I-shaped grooves to form a differential X-axis electromagnetic receiving coil; and induction coils are wound in the other two symmetrical I-shaped grooves to form a differential Y-axis electromagnetic receiving coil.

4. A three-component electromagnetic response receiving probe in a deep seabed hole according to claim 1, characterized in that: The receiving circuit and battery fixing structure (8) comprises a cylindrical battery compartment (82) arranged at one end, a plurality of battery mounting holes arranged in parallel in the cylindrical battery compartment (82), and an arc-shaped receiving circuit mounting compartment arranged at the other end for fixing the receiving unit (9).

5. The three-component electromagnetic response receiving probe in a deep seabed hole according to claim 1, characterized in that: The two ends of the connecting shaft (4) are connected to the head end pressure-bearing chamber (10) or the tail end pressure-bearing chamber (1) via end covers, the end cover has a hole in the middle, one end is connected to the connecting shaft (4) via a thread, and the other end is provided with an O-type pressure-resistant sealing ring placement groove on the outer surface, and after being inserted into the head end pressure-bearing chamber (10) or the tail end pressure-bearing chamber (1), it is fixed to the head end pressure-bearing chamber (10) or the tail end pressure-bearing chamber (1) via a raised ring flange provided on the end cover.

6. A three-component electromagnetic response receiving probe in a deep seabed hole according to claim 5, characterized in that: The non-magnetic titanium alloy shell (6) wraps the three-component electromagnetic receiving probe and part of the end cover, and glue is poured into the non-magnetic titanium alloy shell.

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