CN214225442U - Underground exploring tube and three-component magnetic measurement system - Google Patents

Abstract

The utility model relates to a visit pipe and three-component magnetism survey system in pit, wherein, visit the pipe in pit and include: the device comprises a shell (11), a three-component sensor module (12) arranged in the shell (11), a data measurement modulation transmission module (13) connected with the three-component sensor module (12), and a power supply module (14) connected with the three-component sensor module (12) and the data measurement modulation transmission module (13); and a non-magnetic vacuum heat-insulating pipe used for wrapping the three-component sensor module (12) and the data measurement modulation transmission module (13) is arranged in the shell (11). The scheme realizes the improvement of the accuracy of deep positioning and inference interpretation of deep ore body (3000 + 5000m) exploration, and provides powerful support for searching deep and hidden mineral resources.

Description

Underground exploring tube and three-component magnetic measurement system

Technical Field

The utility model relates to a survey the field in the pit, especially relate to a visit pipe and three-component magnetism survey system in pit.

Background

The high-precision three-component magnetic measuring system for deep well is a magnetic measuring instrument set in well, which is composed of three-component detecting tube in high-precision well, 5000m automatic winch and winch controller, and ground data acquisition system. It is the most effective geophysical prospecting equipment for finding magnet deposits. Particularly, the deep ore body with the buried depth of more than 3000-. The conventional borehole three-component magnetometer in China cannot meet the requirements of deep exploration above 3000-. How to solve the deep location problem of mine deep and the blind ore body, how to solve the problem of "attacking deeply" of three-component magnetometer geophysical prospecting instrument equipment in the well is very urgent.

In addition, the detection depth of the existing small-caliber three-component logging instrument can only reach 3000m at most, the measurement accuracy of the vertical component and the horizontal component is respectively 80nT and 100nT, and the structure and the detection accuracy cannot adapt to higher temperature and pressure along with the increase of the detection depth, so that the small-caliber three-component logging instrument cannot be used in deep well detection.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a visit pipe and three-component magnetism survey system in pit solves the poor problem of detection ability in the deep well.

In order to realize the above-mentioned utility model purpose, the utility model provides a visit pipe in pit, include: the device comprises a shell, a three-component sensor module arranged in the shell, a data measurement modulation transmission module connected with the three-component sensor module, and a power supply module connected with the three-component sensor module and the data measurement modulation transmission module;

and a non-magnetic vacuum heat-insulating pipe used for wrapping the three-component sensor module and the data measurement modulation transmission module is arranged in the shell.

According to an aspect of the present invention, the three-component sensor module includes: the device comprises a three-axis fluxgate magnetometer, a three-axis accelerometer, a control unit connected with the three-axis fluxgate magnetometer and the three-axis accelerometer, and a transmission unit connected with the control unit;

the transmission unit, the control unit, the triaxial accelerometer and the triaxial fluxgate magnetometer are sequentially arranged along the axial direction of the shell.

According to an aspect of the present invention, the three-component sensor module further comprises: the temperature sensor is connected with the control unit;

the control unit collects the electric signal of the temperature sensor and is used for compensating and correcting the output signal of the transmission unit.

According to one aspect of the present invention, the measurement accuracy of the vertical component and the horizontal component of the three-component sensor module is respectively better than 50 nT;

the single component precision of the three-axis fluxgate magnetometer in a static state is better than 0.1 nT.

According to an aspect of the utility model, the temperature rise of temperature in the no magnetism vacuum insulation pipe in 4 hours is less than or equal to 60 ℃.

According to one aspect of the present invention, the housing is a cylindrical body with one closed end and one open end, and the open end is provided with a joint;

a plurality of sealing structures are arranged at the positions where the opening end of the shell is connected with the joint;

in the shell, the power module, the data measurement modulation transmission module and the three-component sensor module are sequentially arranged along the direction far away from the opening end of the shell.

According to an aspect of the present invention, the compressive strength of the housing is greater than or equal to 60 MPa.

According to an aspect of the present invention, the data measurement modulation transmission module is used for receiving the output signal of the transmission unit, and will the output signal is converted into a binary signal and output.

According to one aspect of the present invention, the metal conductors and the components in the power module are sintered on a ceramic sheet, and the metal conductors and the components are covered with a heat insulating layer;

the heat insulation layer is filled with organic silicon resin.

In order to realize the above object of the present invention, the utility model provides a three-component magnetic measurement system, include: the underground probe is a ground acquisition system which is used for acquiring and analyzing the output signal of the underground probe;

the ground acquisition system comprises: the system comprises a winch, a ground controller and a data acquisition and display device, wherein the winch is used for being connected with the underground probe;

the winch is provided with a winch controller for controlling the winch to operate;

the data acquisition and display device is connected with the underground exploring tube by adopting a wired link or a wireless link.

According to the utility model discloses a scheme has realized improving the accuracy of deep location and the inference explanation of deep ore body (3000) 5000m) investigation, provides powerful support for seeking deep and blind mineral resources.

According to the utility model discloses a scheme, it has not only improved measurement accuracy, but also greatly increased small-bore magnetism three-component measurement of depth degree. In the aspect of measurement accuracy, a high-accuracy three-axis fluxgate sensor is adopted, the fluxgate accuracy can reach 0.1nT, the sensor is subjected to temperature compensation, three-axis consistency correction, orthogonality correction, sensitivity test and other work through an experiment and calculation method, and the overall measurement accuracy of the three-component sensor can reach a vertical component and the horizontal component is better than 50 nT. In the aspect of measuring depth, the temperature and pressure indexes of the deep well need to reach the temperature resistance of 150 ℃ and the pressure resistance of 60MPa, and the requirements of high pressure resistance and high temperature resistance are met.

According to the utility model discloses a scheme, to 3000 supplyes 5000m degree of depth high temperature demand, the used components and parts of sensor are high temperature resistant product, can stable work under high temperature environment, simultaneously, revise with the calibration factor system through microprocessor to the temperature drift of sensor, make the sensor have good output stability under the full temperature environment.

Drawings

FIG. 1 is a block diagram schematically illustrating a downhole probe according to one embodiment of the present invention;

fig. 2 is a structural view schematically showing a sealing structure of an open end of a housing according to an embodiment of the present invention;

FIG. 3 is a block diagram schematically illustrating a three-component sensor module according to one embodiment of the present invention;

fig. 4 is a diagram schematically illustrating a connection structure of a data measurement modulation transmission module according to an embodiment of the present invention;

fig. 5 and 6 are graphs schematically illustrating waveforms of a 2FSK signal according to an embodiment of the present invention;

fig. 7 is a block diagram schematically illustrating a power module according to an embodiment of the present invention;

FIG. 8 is a block diagram schematically illustrating a three-component magnetic measurement system, in accordance with one embodiment of the present invention;

fig. 9 is a panel diagram schematically illustrating a winch controller according to an embodiment of the present invention;

fig. 10 is a panel diagram schematically illustrating a floor controller according to an embodiment of the present invention.

Detailed Description

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

In describing embodiments of the present invention, the terms "longitudinal," "lateral," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and other terms are used in an orientation or positional relationship shown in the associated drawings for convenience in describing the invention and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments, which are not repeated herein, but the present invention is not limited to the following embodiments.

As shown in fig. 1, according to an embodiment of the present invention, the present invention provides a downhole probe, including: the device comprises a shell 11, a three-component sensor module 12 arranged in the shell 11, a data measurement modulation transmission module 13 connected with the three-component sensor module 12, and a power supply module 14 connected with the three-component sensor module 12 and the data measurement modulation transmission module 13. In the present embodiment, a non-magnetic vacuum thermal insulation pipe 111 for wrapping the three-component sensor module 12 and the data measurement modulation transmission module 13 is provided in the housing 11. The utility model discloses an exploring tube in pit is used for in the operation of 3000m to 5000 m's depths, and exploring tube in pit through the aforesaid setting has the internal environment of the stable work of the slight and inside components and parts of stable structure still can be guaranteed under the influence of factors such as mud, high temperature in the position of locating, and then is favorable to guaranteeing whole exploring tube in pit at the stability and the life of depths work.

As shown in fig. 1, according to an embodiment of the present invention, the housing 11 is a cylindrical body with one closed end and one open end, and the open end is provided with a joint 15. In this embodiment, because the utility model discloses a probe is used for the operation in 3000m to 5000 m's depths in the pit, and then this casing 11's compressive strength is more than or equal to 60 Mpa. Through the setting, make the utility model discloses a compressive strength of casing of exploring tube in pit is more than or equal to 60Mpa and has guaranteed that it still can bear keeping stable in structure under the condition of great extrusion force in the deep well, and is complete and stable favourable to effective inside structure of protection, and then has guaranteed the job stabilization and the life of whole device.

In the present embodiment, the housing 11 is made of a nonmagnetic titanium alloy tube having an outer diameter of 60mm and a wall thickness of 3 mm. By adopting the titanium alloy pipe as the shell, the titanium alloy pipe has the advantages of light weight and high pressure resistance, and particularly, the compressive strength of the titanium alloy pipe is several times that of common materials and can reach more than 80 MPa. The shell made of the titanium alloy pipe is light in weight and high in strength, and is very favorable for ensuring the recovery of deep well operation environment, particularly under the condition that the periphery has influence factors such as slurry and the like.

Referring to fig. 1 and 2, according to an embodiment of the present invention, a plurality of sealing structures are arranged at positions where the open end of the housing 11 is connected to the joint. In the present embodiment, the joint 15 is a bridle joint. Two sealing structures are arranged at the position where the bridle joint is connected with the opening end of the shell 11, so that the high-pressure resistant effect of the whole underground exploring tube is ensured. In the embodiment, in order to ensure the pressure resistance of the underground exploring tube and the safety of the underground exploring tube, after the underground exploring tube processing device is assembled, the pressure test of the hollow tube high-pressure test well is carried out before a measuring electronic circuit is not installed, and the pressure is kept for four hours under the environment of 60Mpa, so that the whole shell is ensured not to deform and seep water under the high-pressure state.

As shown in fig. 1, according to an embodiment of the present invention, in the housing 11, the power module 14, the data measurement modulation transmission module 13, and the three-component sensor module 12 are sequentially disposed along a direction away from the opening end of the housing 11. Through the arrangement, the three-component sensor module 12 is closer to the end part of the shell 11 and is far away from the power module 14, so that accurate and sensitive measurement of the three-component sensor module 12 on the external environment is effectively guaranteed, and the influence of the power module 14 on the measurement precision is effectively avoided.

As shown in fig. 3, according to an embodiment of the present invention, the three-component sensor module 12 includes: a three-axis fluxgate magnetometer 121, a three-axis accelerometer 122, a control unit 123 for connecting the three-axis fluxgate magnetometer 121 and the three-axis accelerometer 122, a transmission unit 124 for connecting the control unit 123, and an interface a 1. In the present embodiment, the transmission unit 124 employs eight channels AD; in the present embodiment, the transmission unit 124, the control unit 123, the triaxial accelerometer 122, and the triaxial fluxgate magnetometer 121 are sequentially provided along the axial direction of the housing 11.

As shown in fig. 1, according to an embodiment of the present invention, the measurement accuracy of the vertical component and the horizontal component of the three-component sensor module 12 is better than 50nT, respectively. In the present embodiment, the three-axis fluxgate magnetometer 121 has a one-component accuracy better than 0.1nT in the stationary state. In this embodiment, the three-component sensor module 12 is the core of the entire downhole probe, and the three-axis fluxgate magnetometer 121 senses the change of the azimuth angle and the three-axis accelerometer 122 senses the change of the attitude angle to fuse the measurement results of the two, thereby realizing high-precision real-time output of the azimuth angle of ± 1 degree and the attitude angle of ± 0.1 degree. Through the aforesaid setting, but with triaxial fluxgate magnetometer 121 the component precision setting in above-mentioned within range, realized the utility model discloses a high progress of exploring tube in the pit when the deep well operation is measured, to improving the utility model discloses a measurement accuracy has played the key role.

As shown in fig. 1, according to an embodiment of the present invention, the three-component sensor module 12 further includes: a temperature sensor connected to the control unit 123. In the present embodiment, the control unit 123 collects the electric signal of the temperature sensor and uses it to perform compensation correction on the output signal of the transmission unit 124. In the present embodiment, the output signals of the three-component sensor module 12 are compensated and corrected in real time by an experimental test method. Specifically, the temperature sensor is directly installed on the circuit board, the zero drift of the circuit caused by temperature change is superposed on the output useful signal, and then the zero drift of the circuit board needs to be collected before the signal is collected, and the specific numerical value of the drift is obtained through tests. The specific method comprises the steps of putting a single circuit board (namely, a circuit board without a temperature sensor) to be debugged into an adjustable temperature control box, adding a standard reference signal, detecting an output signal of the single circuit board, obtaining the change of the output signal along with the continuous change of temperature, and recording the output changes corresponding to different temperatures to obtain a temperature drift data table. Furthermore, after the instrument works to collect signals, the temperature sensor and the temperature drift data table are installed, the corresponding data in the signals are subtracted by the numerical value in the line temperature drift data table, and therefore the influence caused by temperature can be eliminated.

According to the utility model discloses, through gathering the drift of line zero point and generating the drift data table of zero point, after installing temperature sensor on the circuit board like this, can obtain the drift value that should eliminate under the current temperature according to the numerical value that the sensor obtained, it acquires the process and calculates or interpolation calculation more convenient and fast than through the formula, and the compensation precision is the highest, can improve the work efficiency of processing procedure CPU by a wide margin moreover.

As shown in fig. 1, according to an embodiment of the present invention, the temperature rise in the non-magnetic vacuum insulation tube is less than or equal to 60 ℃ within 4 hours. In the embodiment, in order to meet the working requirement of the three-component sensor module 12 and the data measurement modulation transmission module 13 at the high temperature of 150 ℃ under the well depth of 3000-. Namely, a layer of non-magnetic vacuum heat-insulating pipe is added in the shell 11. When the external temperature is 150 ℃, the temperature rise in the vacuum flask is less than or equal to 60 ℃ within 4 hours, and the temperature in the vacuum flask reaches 85 ℃ within 4 hours according to the calculation of the room temperature of 25 ℃. In the embodiment, the temperature resistance of the three-component sensor module 12 and the data measurement modulation transmission module 13 in the probe is designed to be 125 ℃, and the temperature resistance of the power supply module 14 is designed to be 150 ℃, so that the three-component sensor module 12 and the data measurement modulation transmission module 13 are arranged in the non-magnetic vacuum heat-insulating pipe, the requirement of high temperature resistance can be met, and the high temperature resistance requirement of 3000 plus 5000m well depth is met.

As shown in fig. 4, according to an embodiment of the present invention, the data measurement modulation transmission module 13 is configured to receive the output signal of the transmission unit 124, convert the output signal into a binary signal, and output the binary signal. In this embodiment, after the data measurement modulation transmission module 13 receives the signal from the three-component sensor module 12, the received signal is simply processed into a binary format, and then modulated into carrier signals with different frequencies, and transmitted to the ground data acquisition controller through the 3000-plus-5000 m cable, and then processed and demodulated into a binary code by the ground data acquisition controller.

In this embodiment, the signal data processed by the data measurement modulation transmission module 13 is transmitted by using a 2FSK carrier single-core cable, so as to save cable resources. The digital information is transmitted by frequency of the carrier by binary digital frequency modulation (binary frequency Shift keying) of 2fsk (frequency Shift keying), i.e. the frequency of the carrier is controlled by the transmitted digital information. Referring to fig. 5 and 6, in the 2FSK signal, the symbol "0" corresponds to the carrier frequency f1, and the symbol "1" corresponds to the modulated waveform of the carrier frequency f2 (another carrier frequency different from f 1), and the change between f1 and f2 is instantaneous. When transmitting a '0' signal, transmitting a carrier wave with the frequency of f 1; when a "1" signal is transmitted, a carrier wave with the frequency f2 is transmitted. At a receiving end, firstly, the obtained signal is subjected to band-pass filtering, then, noise and interference except carrier frequency are filtered, so that the signal can completely pass through, then, an envelope curve at the positive end of the full-wave rectifier is output, then, a baseband envelope signal is output through a low-pass filter or a rectification module, and then, a baseband binary signal is output through a sampling decision device, so that the demodulation of a carrier signal is completed. The 2FSK transmission mode has the characteristics of long transmission distance and strong anti-interference capability, and the transmission rate is 192000 bps.

As shown in fig. 7, according to an embodiment of the present invention, the power module 14 is mainly composed of a DC-DC conversion module, and the main function is to perform DC-DC voltage stabilization and supply power to other circuits such as the three-component sensor module 12 and the data measurement modulation transmission module 13 in the downhole probe. The highest input voltage of the front end of the power supply module 14 reaches 80-140V, the power supply input dynamic range is large, the power supply module 14 outputs +24V, and then the +24V is used for obtaining the +/-5V, +/-12V and 3.3V of the working power supply of the components in the underground exploring tube. In order to meet the high temperature resistance requirement of 3000-5000m well depth, the power module 14 can work for 4 hours at a high temperature of 150 ℃, and all circuit chips of the power module 14 adopt high temperature resistant import chips. In this embodiment, the circuit of the power module 14 is formed by sintering a metal conductor and a component on a ceramic sheet at a high temperature by a thick film process, and filling a thermal insulation layer with a silicone resin to form a thermal insulation layer, thereby achieving stable output of the circuit in a high-temperature and strong-vibration environment.

As shown in fig. 8, according to an embodiment of the present invention, the present invention provides a three-component magnetic measurement system, including: the underground exploring tube 1 is a ground acquisition system 2 which is used for acquiring signals output by the underground exploring tube 1 and analyzing the signals. In the present embodiment, the ground collection system 2 includes: the system comprises a winch, a ground controller and a data acquisition and display device, wherein the winch is used for being connected with the underground exploring tube 1, the ground controller is used for being connected with the winch, and the data acquisition and display device is used for acquiring output signals of the underground exploring tube 1. In the present embodiment, the data acquisition and display device is connected to the downhole probe 1 by a wired link or a wireless link.

According to the utility model discloses an embodiment, the winch includes: the cable winding device comprises a winding drum for winding a cable, a driving device for driving the winding drum to rotate, a speed reducer installed between the winding drum and the driving device, a cable arrangement device arranged adjacent to the winding drum, a winch controller and a brake device. In the present embodiment, the driving device uses an ac inverter motor as power.

In the present embodiment, the speed reducer is used to reduce the output speed of the drive device, and at the same time, the torque of the rotating shaft can be increased to increase the lifting force of the drum. In the embodiment, the reducer adopts a planetary gear reducer with small tooth difference and consists of an output shaft, a planetary gear, an internal gear, a cylindrical pin shaft, a pin shaft sleeve and an eccentric sleeve. In the embodiment, in order to ensure the balance performance and the uniform stress of the planet wheel, the friction is reduced. Two planet wheels which form an angle of 180 degrees are adopted, and a plurality of cylindrical pin holes are uniformly formed on the two planet wheels along the circumference. And simultaneously, a plurality of cylindrical pins are correspondingly and uniformly arranged on a disc of the output shaft and correspondingly inserted into pin holes on the planet wheels. The cylindrical pin is provided with a movable pin shaft sleeve to reduce friction and wear. The speed reducer has the advantages of simple and compact structure, small volume, large speed ratio and low processing cost.

In the embodiment, the cable arranging device can automatically and orderly wind the cable on the winding drum and comprises a composite screw rod, a wire arranging wheel, a guide key, a transmission gear (chain) wheel, the winding drum, an encoder and the like. The winding drum and the reciprocating rod are respectively provided with a chain wheel which is connected through a chain. The wire arrangement wheel can move left and right on the wire leading screw through the guide key. When the cable is wound on the winding drum, the wire arranging wheel moves the distance of the cable diameter on the wire feeding and rewinding rod every time when the cable is wound for one circle. When the cable winds to the side of the winding drum, the cable automatically winds to the other side of the winding drum through the automatic reversing function of the reciprocating screw rod and the guide key. The depth encoder is arranged on the wire arranging wheel, so that the depth of the cable can be detected (by calculating the pulse number of the encoder), and the speed of the cable in the well can be calculated.

In this embodiment, the winch controller is used to control the winch rotation direction, stopping and running speed, while displaying depth, speed, current, voltage, frequency converter frequency, tension, see fig. 9.

In this embodiment, the brake device is at least one of an electric self-locking brake, a mechanical self-locking brake, and a manual brake.

As shown in fig. 10, according to an embodiment of the present invention, the main functions of the surface controller include providing the working power supply of the downhole probe, setting the control parameters (commands), receiving the measurement data uploaded by the downhole probe, displaying, storing, counting the depth of the data in real time, and packaging the current data and the current depth. Meanwhile, the system meets the requirements of 3000-5000m well logging, and has the advantages of small size, light weight, easy carrying and convenient operation; positive and negative correction function of well depth; the code disc is suitable for code discs with different pulse numbers; an independent self-test signal generating unit; USB type communication interface. In this embodiment, the control panel (see fig. 10) of the surface controller is designed to have various interfaces, switches and keys with functions of an AC220V power connection port, a winch depth signal access port, a downhole signal line connection port, a communication port of a data acquisition and display device (industrial personal computer), and is also provided with input and output devices such as a keyboard, a display, a USB and the like.

According to the utility model discloses an embodiment, ground controller hardware design principle has following characteristics:

A. the system adopts a large number of integrated circuit interface chips and the design idea of functional module independence. The reliability of the field instrument is improved;

B. considering the working environment and conditions of field instruments, a waterproof, dustproof and moistureproof film panel and an ABS case with better sealing property are adopted as an instrument working panel;

C. a wider voltage input range (220V +/-20%) is designed, so that the instrument has greater adaptability;

D. and the software is adopted to automatically compensate and correct the depth error, so that the reliability of system hardware is improved.

The foregoing is merely exemplary of embodiments of the present invention and reference should be made to the apparatus and structures herein not described in detail as it is known in the art to practice the same in general equipment and general methods.

The above description is only one embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A downhole sonde, comprising: the device comprises a shell (11), a three-component sensor module (12) arranged in the shell (11), a data measurement modulation transmission module (13) connected with the three-component sensor module (12), and a power supply module (14) connected with the three-component sensor module (12) and the data measurement modulation transmission module (13);

and a non-magnetic vacuum heat-insulating pipe used for wrapping the three-component sensor module (12) and the data measurement modulation transmission module (13) is arranged in the shell (11).

2. A downhole probe according to claim 1, wherein the three-component sensor module (12) comprises: the device comprises a three-axis fluxgate magnetometer (121), a three-axis accelerometer (122), a control unit (123) connected with the three-axis fluxgate magnetometer (121) and the three-axis accelerometer (122), and a transmission unit (124) connected with the control unit (123);

the transmission unit (124), the control unit (123), the triaxial accelerometer (122) and the triaxial fluxgate magnetometer (121) are sequentially arranged along the axial direction of the shell (11).

3. A downhole probe according to claim 2, wherein the three-component sensor module (12) further comprises: a temperature sensor connected to the control unit (123);

the control unit (123) collects the electric signal of the temperature sensor and is used for compensating and correcting the output signal of the transmission unit (124).

4. A downhole probe according to claim 2, wherein the measurement accuracy of the vertical and horizontal components of the three-component sensor module (12) is better than 50nT, respectively;

the single component precision of the tri-axis fluxgate magnetometer (121) in a static state is better than 0.1 nT.

5. The downhole probe of any one of claims 1 to 4, wherein the temperature rise within the nonmagnetic evacuated insulation tube is less than or equal to 60 ℃ over a period of 4 hours.

6. A downhole probe according to claim 5, wherein the housing (11) is a cylindrical body closed at one end and open at one end, the open end of which is provided with a joint;

a plurality of sealing structures are arranged at the position where the opening end of the shell (11) is connected with the joint;

in the shell (11), the power module (14), the data measurement modulation transmission module (13) and the three-component sensor module (12) are sequentially arranged along the direction far away from the opening end of the shell (11).

7. A downhole probe according to claim 6, wherein the casing (11) has a compressive strength of greater than or equal to 60 MPa.

8. A downhole probe according to claim 2, wherein the data measurement modulation transmission module (13) is adapted to receive the output signal of the transmission unit (124) and to convert the output signal into a binary signal and output the binary signal.

9. A downhole probe according to claim 1, wherein the metal conductors and components in the power module (14) are sintered on a ceramic plate and covered with a thermally insulating layer;

the heat insulation layer is filled with organic silicon resin.

10. A three component magnetic logging system employing the downhole sonde of any one of claims 1 to 9, comprising: the underground exploring tube (1) is a ground acquisition system (2) which is used for acquiring signals output by the underground exploring tube (1) and analyzing the signals;

the ground acquisition system (2) comprises: the system comprises a winch, a ground controller and a data acquisition and display device, wherein the winch is connected with the underground probe (1), the ground controller is connected with the winch, and the data acquisition and display device is used for acquiring output signals of the underground probe (1);

the winch is provided with a winch controller for controlling the winch to operate;

the data acquisition and display device is connected with the underground exploring tube (1) by adopting a wired link or a wireless link.

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