Drilling transient electromagnetic instrument

Abstract

The invention relates to the technical field of geophysical prospecting, in particular to a borehole transient electromagnetic instrument, which comprises a power supply short section and a detection short section, the power supply short section and the detection short section are detachably connected, the borehole transient electromagnetic instrument can be propelled along with a drill rod, and the detection short section can simultaneously measure magnetic field change information in three orthogonal directions. A data storage unit and an attitude measurement module are also integrated. The invention provides a high-integration borehole transient electromagnetic instrument, which can realize integration of borehole trajectory measurement and transient electromagnetic three-component measurement, has the function of storing test data, does not need to connect a communication cable in the test process, and reduces the complexity of system connection.

Description

Technical Field

[0001] The invention relates to the technical field of geophysical exploration, in particular to a borehole transient electromagnetic instrument. Background Art

[0002] Mine water damage is one of the main disasters in the production and construction of coal mines. The current mechanized and rapid tunneling of tunnels has continuously increased the demand and requirements for coal mine water prevention and control technology and equipment. Among the geophysical exploration methods for mine water damage exploration, mine transient electromagnetic method is currently a geophysical method that is widely used to detect hidden water-rich areas in coal mines with good results. The transient electromagnetic method injects pulse current into the transmitting loop. The high-speed change of current will generate a pulse magnetic field underground. The target body underground will be excited by the pulse magnetic field to generate induced eddy currents, thereby generating a secondary induced magnetic field. By using a magnetic field sensor to receive the induced magnetic field strength at different times, the electrical parameter information of the underground target body at different depths can be obtained. The mine transient electromagnetic method has the advantages of long detection distance and sensitive response to low-resistance bodies.

[0003] The transmitting and receiving coils of conventional mine transient electromagnetic methods generally use multi-turn square loops, which have problems such as large detection blind areas, susceptibility to interference from metal bodies in tunnels, large volume effects, and low detection accuracy. Compared with the above-mentioned geophysical detection methods, the borehole transient electromagnetic method places the receiving probe in the borehole. Since it is closer to the detection target and farther away from the tunnel, it can not only observe a stronger response signal, but also effectively weaken the interference of various electromagnetic signals outside the hole, which can meet the needs of deep burial and refined detection, especially water hazard detection.

[0004] At present, the working methods of observing transient electromagnetic field response in boreholes mainly include: ground-well transient electromagnetic method, tunnel-borehole transient electromagnetic method, transient electromagnetic logging and borehole transient electromagnetic method. Among them, the borehole transient electromagnetic instrument sets the transmitting coil and the receiving coil in the borehole at the same time, and uses the drill rod of the drilling rig to push it over a long distance. It is used with a drilling rig, pushing and exploring at the same time, and can be used as an important means of long borehole detection.

[0005] There are still some shortcomings in the drilling transient instrument in the prior art: since the detection unit is advanced in the borehole with the drill pipe, it is limited by the borehole size and integration level. The receiving antenna can only measure the magnetic field change information in one component direction at a time. To complete the measurement of the three components, it is necessary to send transient pulses in the three component directions respectively and collect the magnetic field component signals in the corresponding directions. After denoising, inversion and imaging of the collected data, the overall induced magnetic field information of the target range is obtained; at the same time, the data collected by the electromagnetic instrument needs to be transmitted to the host computer in real time through a communication cable for storage. The transient electromagnetic instrument itself does not provide the function of storing data, which increases the complexity of system connection and system cost. Summary of the invention

[0006] The present invention provides a drilling transient electromagnetic instrument with the characteristics of high integration, which can realize the integration of drilling trajectory measurement and transient electromagnetic three-component measurement. At the same time, the transient electromagnetic instrument has the function of storing test data. During the test, there is no need to use a communication cable to connect to a host computer, which reduces the complexity of system connection.

[0007] This application provides the following technical solutions:

[0008] A drilling transient electromagnetic instrument comprises a power supply short section and a detection short section, wherein the power supply short section is used to supply power to the detection short section, and the detection short section is used to measure the electromagnetic response information of a geological body, wherein the power supply short section and the detection short section are detachably connected, wherein the power supply short section is detachably connected to a drill pipe via a drill pipe adapter, and wherein the detection short section comprises a receiving antenna, wherein the receiving antenna comprises three mutually orthogonal receiving coils, and is used to simultaneously measure the magnetic field change information in three orthogonal directions.

[0009] Technical principle: The structure of the transient electromagnetic instrument is divided into a power supply short section and a detection short section, which can realize power supply management and detection functions respectively. The assembled transient electromagnetic instrument can be combined with the drill pipe to carry out detection as the drill pipe is advanced. At the same time, the detection unit can realize the simultaneous measurement of three-component information.

[0010] Beneficial effects: The transient battery instrument has a simple structure and high integration. It can be quickly disassembled and assembled, and connected to the drill pipe through the drilling adapter. It can be advanced with the drill pipe to achieve trajectory measurement while drilling. The detection pup measures three-component information at the same time, which can further improve the test efficiency. The highly integrated split structure also provides flexibility for maintenance and replacement of accessories. In addition, the drill pipe adapter can be adapted to drill pipes of different specifications, which increases the scope of use of the transient electromagnetic instrument.

[0011] Furthermore, the power supply pup joint includes an outer shell of the power supply pup joint, an inner shell of the power supply pup joint, a plug and a battery cartridge connector. The outer shell of the power supply pup joint is a tubular structure with one end closed, and the inner shell of the power supply pup joint is a tubular structure with both ends open. The outer diameter of the inner shell of the power supply pup joint is equal to the inner diameter of the outer shell of the power supply pup joint. A mining battery and a power supply control circuit are installed in the inner shell of the power supply pup joint. The mining battery and the power supply control circuit are electrically connected. The plug and the battery cartridge connector are respectively installed at the two ends of the inner shell of the power supply pup joint. The plug, the inner shell of the power supply pup joint, the mining battery, the power supply control circuit and the battery cartridge connector are combined to form an intrinsically safe battery cartridge, and the intrinsically safe battery cartridge is installed inside the outer shell of the power supply pup joint.

[0012] Beneficial effects: The power supply short section has the characteristics of intrinsic safety and can safely and reliably supply power to the transient electromagnetic instrument.

[0013] Furthermore, the detection pup section includes a detection pup section shell, a detection skeleton and a threaded nesting, the detection pup section shell includes a tubular cavity with a closed front end and an open rear end, the detection skeleton is installed in the tubular cavity of the detection pup section, and the threaded nesting is installed at the open end of the tubular cavity, which is used to close the tubular cavity and fix the detection skeleton to the detection pup section shell; the detection skeleton includes a detection bracket, a detection control module, a receiving antenna, and a transmitting antenna, the detection bracket is used to provide fixation and support for the detection control unit, the receiving antenna and the transmitting antenna, the detection control module is used for control and data acquisition of the drilling transient electromagnetic instrument, the transmitting antenna is used to generate a pulsed magnetic field, and the receiving antenna is used to measure magnetic field change information.

[0014] Beneficial effect: The detection pup section has a complete sealing and supporting structure, which fully guarantees the reliability of each functional unit.

[0015] Furthermore, the detection skeleton sequentially arranges a detection control module, a transmitting antenna and a receiving antenna along the axial direction of the detection short section, and the receiving antenna is a mutually orthogonal three-component antenna, including an x-direction coil, a y-direction coil and a z-direction coil.

[0016] Beneficial effect: The receiving antenna is arranged at the front end of the detection short section, which can effectively reduce the electromagnetic interference of other functional units on the receiving signal. At the same time, the receiving antenna is closer to the geological body, and the measurement data is more accurate.

[0017] Furthermore, the detection control module includes a transmitting circuit unit, a receiving circuit unit, a main controller, a storage unit and a communication unit. The transmitting circuit unit is electrically connected to the transmitting antenna for generating a pulse electrical signal; the receiving circuit unit is electrically connected to the receiving antenna for sampling the three-component voltage signal; the main controller is electrically connected to the transmitting circuit unit, the receiving circuit unit, the storage unit and the communication unit for controlling the working states of the transmitting antenna and the receiving antenna, and for processing the sampling of the three-component voltage signal to establish time series data. The storage unit is used to store the processed time series data, and the communication unit is used to establish communication with a host computer.

[0018] Beneficial effects: A large-capacity storage unit is integrated in the detection pup joint, which stores the measurement data in real time during the measurement process. There is no need to connect a communication cable to upload data in real time, which reduces the complexity of system connection and system cost.

[0019] Furthermore, the detection skeleton also includes a posture measurement module for measuring the working posture information of the detection pup joint, and the working posture information includes the azimuth angle, tool face angle and inclination angle of the detection pup joint.

[0020] Beneficial effects: The posture measurement module is integrated in the detection pup section, which can realize the integration of drilling trajectory measurement and transient electromagnetic three-component measurement. The upper computer software can combine the trajectory measurement data with the three-component measurement data to complete the precise imaging of the geological body.

[0021] Furthermore, an opening is provided in the center of the threaded nest and the battery tube connector, the power control circuit is provided with a power supply line, the power supply line passes through the opening in the center of the battery tube connector, and a power supply interface is provided at the end of the power supply line; the detection control module is provided with a receiving line, the receiving line passes through the center opening of the threaded nest, and a power receiving interface is provided at the end of the receiving line, and the power supply interface is matched and connected with the power receiving interface.

[0022] Beneficial effect: The design of the power supply interface and the power receiving interface enables quick power supply connection between the power supply short section and the detection short section.

[0023] Furthermore, the power supply short section outer shell and the detection short section shell are made of glass fiber, and the drill pipe adapter head is made of non-magnetic steel material.

[0024] Beneficial effects: The fiberglass outer shell and non-magnetic steel material can avoid attenuation of reflected signals and electromagnetic interference to the receiving antenna, effectively ensuring the working performance of the electromagnetic instrument detection.

[0025] Furthermore, the borehole transient electromagnetic instrument also includes a host computer software, which is used to establish a communication connection with the detection short section to set the working parameters of the borehole transient electromagnetic instrument, and is also used to read and analyze the measurement data of the borehole transient electromagnetic instrument. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of a drilling transient electromagnetic instrument;

[0027] Figure 2 is a side view of the battery cartridge connector;

[0028] Figure 3 It is the rear view of the battery cartridge connector;

[0029] Figure 4 It is a schematic diagram of the structure of the detection short section;

[0030] Figure 5 This is a schematic diagram of thread nesting installation;

[0031] Figure 6 This is the flow chart of FPGA control logic;

[0032] Figure 7 is the current-off equivalent diagram of the transmitting circuit unit;

[0033] Figure 8 It is a structural schematic diagram of the fourth installation part. DETAILED DESCRIPTION

[0034] The following is further described in detail through specific implementation methods:

[0035] The marks in the drawings of the specification include: power short section outer shell 1, power short section inner shell 2, mining battery 3, power control circuit 4, battery cartridge connector 5, plug 6, conical closure structure 7, threaded nesting 8, detection control module 9, transmitting antenna 10, receiving antenna 11, detection short section shell 12, attitude measurement module 13, first groove 14, battery cartridge mounting hole 15, second thread 16, first thread 17, first column 18, second column 19, second groove 20, third thread 21, detection bracket 22, threaded nesting mounting hole 23, first mounting portion 24, second mounting portion 25, third mounting portion 26, fourth mounting portion 27.

[0036] Embodiment 1

[0037] A drilling transient electromagnetic instrument, the overall structure is as follows Figure 1 As shown, it includes a power supply sub and a detection sub, wherein the power supply sub includes an intrinsically safe battery cartridge for powering the detection sub; the detection sub is used to measure the electromagnetic response information of the geological body. The power supply sub and the detection sub are detachably connected, and the borehole transient electromagnetic instrument is detachably connected to the drill rod through a drill rod adapter installed on the top of the drill rod, and can be pushed or retreated in the borehole with the drill rod to achieve measurement while pushing.

[0038] The power supply nipple comprises a power supply nipple outer shell 1, a power supply nipple inner shell 2, a plug 6 and a battery cartridge connector 5. The power supply nipple outer shell 1 comprises a tubular cavity with a closed rear end and an open front end, a boss of an outer shell with an increased diameter is provided near the front end of the tubular cavity and the opening, and an inner thread is provided on the inner wall of the outer shell near the outer side of the boss of the outer shell. The front end of the power supply nipple outer shell 1 is a conical closed structure 7, and the outer surface of the conical closed structure 7 is provided with a thread. The rear end of the power supply nipple outer shell 1 is a conical cavity with an internal thread, and the conical cavity is matched and connected with the drill pipe adapter. The power supply nipple inner shell 2 comprises a tubular cavity with openings at both ends, the outer diameter of the power supply nipple inner shell 2 is equal to the inner diameter of the power supply nipple outer shell 1, an inner shell boss with an increased diameter is provided at the front end opening of the power supply nipple inner shell 2, and an inner thread and a mounting hole are provided on the inner wall of the inner shell near the outer side of the boss of the inner shell. A mining battery 3 and a power control circuit 4 are installed in the tubular cavity of the inner shell 2 of the power short section, and the mining battery 3 and the power control circuit 4 are electrically connected. The power control circuit 4 adopts double overvoltage protection, double overcurrent protection technology and sealing glue potting to achieve the intrinsic safety of the power supply. The power control circuit 4 has a power supply line, and the end of the power supply line has a power supply interface for powering the detection short section. In this embodiment, a USB interface is used for power supply.

[0039] The structure of the battery cartridge connector 5 is as follows: Figure 2 and Figure 3 As shown, it includes a first cylinder 18 and a second cylinder 19 of different diameters, wherein the diameter of the first cylinder 18 is equal to the diameter of the inner shell boss, and a cylindrical groove with a diameter equal to the inner diameter of the tubular cavity of the power short section inner shell 2 is provided inside the first cylinder 18, and the cylindrical surface of the first cylinder 18 is provided with a first thread 17 and four battery barrel mounting holes 15 evenly distributed along the outer circumference, which can respectively cooperate with the internal thread and mounting hole at the front end opening of the power short section inner shell 2. The diameter of the second cylinder 19 is equal to the diameter of the outer shell concave platform, and the cylindrical surface of the second cylinder 19 is provided with an annular first groove 14 and a second thread 16, which can cooperate with the internal thread at the front end opening of the power short section outer shell 1; the bottom center of the second cylinder 19 is provided with a through hole, and two symmetrically distributed non-threaded tool holes and one threaded tool hole are also provided.

[0040] In actual use, a special two-prong tool can be used to insert into two threadless tool through holes to tighten the first thread 17 with the internal thread of the power short section inner shell 2; or a special screw tool can be screwed into the threaded tool hole to achieve the pressing and pulling of the power short section inner shell 2. The plug 6, the mining battery 3, and the power control circuit 4 are placed in the cavity of the power short section inner shell 2 in sequence, an O-ring is installed in the first groove 14 of the battery barrel connector 5, a sealant is applied to the first thread 17, and a two-prong tool is used to connect the first thread 17 of the battery barrel connector 5 with the internal thread of the power short section inner shell 2, and the battery barrel connector 5 is fixedly connected to the power short section inner shell 2 through the battery barrel mounting hole 15 and screws; at the same time, the power supply line and power supply interface of the power control circuit 4 are passed through the bottom through hole of the second column 19, and finally epoxy resin is poured through the bottom through hole of the second column 19 to seal the mining battery 3 and the power control circuit 4 to form an intrinsically safe battery barrel. Apply sealant to the second thread 16 and tighten the second thread 16 and the internal thread of the power short section outer shell 1, so that the intrinsically safe battery canister can be firmly installed inside the power short section outer shell 1, and the assembly of the power short section is completed.

[0041] The detection short section includes a detection short section housing 12, a detection frame and a threaded nest 8, and its structure is as follows: Figure 4 As shown. The detection short section housing 12 comprises a tubular cavity with a closed front end and an open rear end, a detection skeleton is installed in the tubular cavity, an annular boss with an increased diameter is provided near the opening at the rear of the tubular cavity, and a thread is provided on the inner wall of the detection short section housing 12 outside the annular boss. The threaded nest 8 is connected to the detection skeleton to close the tubular cavity and complete the fixed connection between the detection skeleton and the detection short section housing 12. An inverted conical cavity matching the conical closed structure 7 is provided at the rear end opening of the tubular cavity, and an internal thread is provided on the inner wall of the inverted cone for connecting the power supply short section.

[0042] The detection framework includes a detection bracket 22, a detection control module 9, a receiving antenna 11, a transmitting antenna 10 and a posture measurement module 13. Figure 4 shown.

[0043] The end of the detection bracket 22 is connected to the threaded nest 8, and the connection diagram is shown in FIG. Figure 5 As shown. The threaded nest 8 is a cylindrical structure, with a circular groove on the top surface, a second groove 20 and a third thread 21 on the cylindrical surface, and a circular through hole, a threaded nest mounting hole 23, a threaded tool hole and a non-threaded tool hole in the center of the bottom surface. The end of the detection bracket 22 is designed as a cylindrical boss structure, and the size of the cylindrical boss matches the circular groove of the threaded nest 8. Mounting holes, tool holes and center through holes are correspondingly provided on the cylindrical boss. Similar to the battery cartridge connector 5, screws can be used to complete the fixed connection between the threaded nest 8 and the detection bracket 22, a spiral tool can be used to press in and pull the detection skeleton, and a two-pronged tool can be used to tighten the third thread 21 and the internal thread of the detection short section shell 12, thereby completing the fixed connection between the detection skeleton and the detection short section shell 12.

[0044] The detection bracket 22 is sequentially arranged with a first mounting portion 24, a second mounting portion 25, a third mounting portion 26, and a fourth mounting portion 27 along the axial direction. Figure 4 shown.

[0045] The first mounting portion 24 is used to mount the attitude measurement module 13, to measure the azimuth, tool face angle and inclination information of the detection short section, and transmit it to the upper computer software to accurately analyze the motion trajectory of the detection short section. The attitude measurement module 13 is fixedly connected to the detection bracket 22 by a pressure strip and screws. A wiring through hole is provided between the first mounting portion 24 and the second mounting portion 25.

[0046] The second mounting portion 25 is used to install the detection control module 9, and the detection control module 9 is fixedly connected to the detection bracket 22 by screws. The detection control module 9 includes a transmitting circuit unit, a receiving circuit unit, a main controller, a storage unit and a communication unit. Among them, the main controller is electrically connected to the transmitting circuit unit, the receiving circuit unit, the storage unit and the communication unit, and is used to control the working state and data acquisition of the transient electromagnetic field, process the sampled data, and establish time series data. In this embodiment, the main controller is implemented using FPGA, preferably using the PH1P series of Anlu Technology. The main modules of the FPGA control logic include: EMMC read-write module, op amp control module, transmission control module, host computer control module, FLASH read-write module, real-time clock read-write module and data acquisition module. The EMMC module is used to control the reading and writing of the storage unit; the operational amplifier control module is used to adjust the gain of the ADC; the transmission control module is used to control the generation of pulse current; the host computer control module receives the control instructions of the host computer to complete the setting of working parameters and data reading; the FLASH read-write module is used to store the working parameters of the transient electromagnetic instrument, such as sampling frequency and sampling interval time; the real-time clock read-write module provides time stamp information for the stored data; the data acquisition module completes the AD conversion of the three-component voltage signal. The flowchart of the FPGA control logic is as follows Figure 6 shown.

[0047] The transmitting circuit unit is electrically connected to the transmitting antenna 10, and transmits a bipolar pulse current to the transmitting antenna 10. The performance of the transient electromagnetic instrument transmitter is related to the shutdown time of the current. The smaller the shutdown time, the more complete the early signal of the induced secondary field is detected by the receiver, and the shallow geological exploration is more accurate. In order to reduce the shutdown time and shorten the blind area of ​​shallow detection, this embodiment designs a fast shutdown transmitter, and uses the internal diode of the field effect tube to build a fast discharge circuit. The transmitter includes an H-bridge drive part. During transmission, Q2 and Q3 short-circuit R. At the moment of transmission shutdown, the parasitic diode inside the field effect tube of the bridge circuit forms a fast discharge circuit, and the inductive load energy stored in the transmitting coil will be quickly released, greatly shortening the shutdown time. The current shutdown equivalent diagram of the transmitting circuit unit is shown in the figure below. Figure 7 shown.

[0048] The receiving circuit unit is electrically connected to the receiving antenna 11, and is used to sample the three-component voltage signal of the receiving antenna. In this embodiment, the receiving circuit unit passes each component signal through two operational amplifiers with different amplification factors, and then uses a 24-bit ADC for voltage sampling. The results of the two samplings are spliced ​​to obtain the sampling value of the voltage signal. A total of 6 groups of ADCs are configured for the three-component voltage signal. The resolution can be doubled by collecting in two groups.

[0049] The storage unit is used to store the spliced ​​sampling data and the working posture information of the detection short section. In this embodiment, the storage unit is implemented by a large-capacity and high-speed EMMC chip. Since the transient electromagnetic instrument continuously measures as the drill pipe advances, it is necessary to align the time and depth of the recorded data. The host computer integrates and processes the collected data according to the corresponding relationship between the time mark and the drill pipe depth.

[0050] The communication unit is used to establish communication with the host computer. In this embodiment, the communication unit includes a USB module and a WIFI module. The USB module is used for the host computer to read the stored collected data, and the WIFI module is used to configure the working parameters of the transient electromagnetic instrument and transmit a small amount of collected data. After the detection unit is powered on, the main controller controls to automatically turn on the WIFI.

[0051] The detection control module 9 is also provided with a receiving wire, which passes through the wiring through hole between the first mounting portion 24 and the second mounting portion 25, the through hole at the end of the detection bracket 22, and the central through hole of the threaded nest 8 in sequence. A power receiving interface is provided at the end of the receiving wire, which is connected to the power supply interface of the power supply short section. In this embodiment, the power receiving interface adopts a USB interface, which is also used to establish USB communication with the host computer to transmit data.

[0052] The third mounting portion 26 is used to mount the transmitting antenna 10, which converts the pulse circuit generated by the transmitting circuit unit into a pulse magnetic field. In this embodiment, the transmitting antenna 10 is arranged along the axial direction of the detection short section and can withstand a current of no less than 3.3 A. A wiring groove is provided between the second mounting portion 25 and the third mounting portion 26.

[0053] The fourth mounting portion 27 is used to mount the receiving antenna 11. The receiving antenna 11 in this embodiment is a three-component antenna orthogonal to each other, and its structure is as follows: Figure 4 and Figure 8 As shown. A routing groove parallel to the axial direction of the detection bracket 22 is provided between the third mounting portion 26 and the fourth mounting portion 27. In the fourth mounting portion 27, the mounting portions of the Z-direction antenna, the Y-direction antenna and the X-direction antenna are arranged in sequence from back to front. Among them, the mounting portions of the Z-direction antenna and the Y-direction antenna are circular grooves perpendicular to the outer surface of the detection bracket 22, and a concave platform with a mounting hole is arranged in the circular groove; the mounting portion of the X-direction antenna is a circular groove arranged at the top of the detection bracket 22, and the diameter and depth of the circular groove are slightly larger than the size of the X-direction antenna. The axis of the Z-direction antenna is located in the same horizontal plane as the center line of the routing groove and is perpendicular to the axial direction of the detection bracket 22; the axis of the Y-direction antenna is rotated 90 degrees counterclockwise along the axis of the Z-direction antenna and is perpendicular to the axial direction of the detection bracket 22; the axis of the X-direction antenna is the same as the axial direction of the detection bracket 22. The Y-direction antenna and the Z-direction antenna are installed and adjusted in position by screws, and each component antenna is fixed by glue sealing after calibration. In this embodiment, the number of turns of each directional coil is not less than 1000 turns.

[0054] The borehole transient electromagnetic instrument also includes a host computer software, which is used to establish a communication connection with the detection short section, set the working parameters of the borehole transient electromagnetic instrument, and read and analyze the measurement data of the borehole transient electromagnetic instrument. The host computer software can be installed in a tablet or an explosion-proof mobile phone. The software functions include parameter setting, data acquisition, data transmission, data analysis, data processing, data imaging, etc. Parameter setting includes setting the parameters of the transmitting coil and the receiving coil, the number of superpositions, the sending cycle, etc.; data acquisition refers to controlling the start or stop of data acquisition; data transmission uses WIFI or USB to communicate with the borehole transient electromagnetic instrument and transmit the collected data to the computer; data analysis refers to parsing the collected data and extracting the data information of the measuring point; data processing refers to preprocessing the borehole transient data, including abnormal elimination, curve smoothing, apparent resistivity calculation, time-depth calculation, etc.; data display includes measuring point attenuation curve display, multi-channel curve display, and contour map display.

[0055] The rear end of the power sub housing 1 is a conical cavity with internal threads, and the front end of the drill pipe adapter is a cone with external threads, which can be adapted to the power sub. The rear end of the drill pipe adapter is a conical cavity with internal threads, which is adapted to the threads at the top of the drill pipe. The front end of the power sub housing 1 is a conical structure with threads, and a cylindrical cavity with the same outer diameter as the battery cartridge connector 5 is provided inside, and the power sub and the detection sub, and the power sub and the drill pipe adapter can be quickly connected through threads.

[0056] The power supply short section housing 1 and the detection short section housing 12 are made of glass fiber material, which can ensure the sensitivity of the receiving antenna while ensuring the structural strength and avoid the power attenuation of the transmitted signal. The drill pipe adapter is made of non-magnetic steel material, which can effectively avoid magnetic field interference.

[0057] In actual use, operate the transient electromagnetic instrument according to the following steps:

[0058] S01. Connect the power receiving interface of the detection short section to the power short section, and connect the power short section to the detection short section. Power on the transient electromagnetic instrument and turn on WIFI.

[0059] S02. Turn on the WIFI switch of the tablet or mobile phone, search and connect to the drilling transient electromagnetic instrument WIFI;

[0060] S03, run the host computer software, set the working parameters of the drilling transient electromagnetic instrument, and start the drilling transient continuous sampling;

[0061] S04, installing the drilling transient electromagnetic instrument to the front end of the drill rod of the drilling rig through the drill rod adapter;

[0062] S05, using a drilling rig to send a drilling transient electromagnetic instrument into the borehole for measurement, the measurement data includes electromagnetic response information and working posture information, a storage unit is used to save the measurement data, and the upper computer software records the time-scale data of the number of drill rods;

[0063] S06. Pull the drilling transient electromagnetic instrument out of the borehole, disconnect the power sub and the detection sub, connect the detection sub with a USB cable, and connect the other end to the host computer;

[0064] S07, connect the drilling transient electromagnetic instrument WIFI, run the host computer software, and obtain the stored collected data;

[0065] S08. Disconnect the USB cable, save the collected data, and the host computer software completes the geological body imaging according to the time-scale data of the number of drill rods, the collected data and the working posture information.

[0066] The above are only embodiments of the present invention. The invention is not limited to the field involved in this implementation case. The common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A drilling transient electromagnetic instrument, characterized in that: The invention comprises a power supply section and a detection section, wherein the power supply section is used to supply power to the detection section, and the detection section is used to measure the electromagnetic response information of the geological body, the power supply section and the detection section are detachably connected, the power supply section is detachably connected to the drill pipe via a drill pipe adapter, and the detection section comprises a receiving antenna, and the receiving antenna comprises three mutually orthogonal receiving coils for simultaneously measuring the magnetic field change information in three orthogonal directions.

2. A drilling transient electromagnetic instrument according to claim 1, characterized in that: The power supply pup joint includes an outer shell of the power supply pup joint, an inner shell of the power supply pup joint, a plug and a battery cartridge connector. The outer shell of the power supply pup joint is a tubular structure with one end closed, and the inner shell of the power supply pup joint is a tubular structure with both ends open. The outer diameter of the inner shell of the power supply pup joint is equal to the inner diameter of the outer shell of the power supply pup joint. A mining battery and a power supply control circuit are installed in the inner shell of the power supply pup joint. The mining battery and the power supply control circuit are electrically connected. The plug and the battery cartridge connector are respectively installed at the two ends of the inner shell of the power supply pup joint. The plug, the inner shell of the power supply pup joint, the mining battery, the power supply control circuit and the battery cartridge connector are combined to form an intrinsically safe battery cartridge. The intrinsically safe battery cartridge is installed inside the outer shell of the power supply pup joint.

3. A drilling transient electromagnetic instrument according to claim 2, characterized in that: The detection pup section includes a detection pup section shell, a detection skeleton and a threaded nesting. The detection pup section shell includes a tubular cavity with a closed front end and an open rear end. The detection skeleton is installed in the tubular cavity of the detection pup section. The threaded nesting is installed at the open end of the tubular cavity to close the tubular cavity and fix the detection skeleton to the detection pup section shell; the detection skeleton includes a detection bracket, a detection control module, a receiving antenna and a transmitting antenna. The detection bracket is used to fix and support the detection control module, the receiving antenna and the transmitting antenna. The detection control module is used for controlling and collecting data of a drilling transient electromagnetic instrument. The transmitting antenna is used to generate a pulsed magnetic field. The receiving antenna is used to measure magnetic field change information.

4. A drilling transient electromagnetic instrument according to claim 3, characterized in that: The detection skeleton sequentially arranges a detection control module, a transmitting antenna and a receiving antenna along the axial direction of the detection short section. The receiving antenna is a mutually orthogonal three-component antenna, including an x-direction coil, a y-direction coil and a z-direction coil.

5. A drilling transient electromagnetic instrument according to claim 4, characterized in that: The detection control module includes a transmitting circuit unit, a receiving circuit unit, a main controller, a storage unit and a communication unit. The transmitting circuit unit is electrically connected to the transmitting antenna for generating a pulse electrical signal; the receiving circuit unit is electrically connected to the receiving antenna for sampling the three-component voltage signal; the main controller is electrically connected to the transmitting circuit unit, the receiving circuit unit, the storage unit and the communication unit for controlling the working states of the transmitting antenna and the receiving antenna, and is also used to process the sampling of the three-component voltage signal to establish time series data. The storage unit is used to store the processed time series data, and the communication unit is used to establish communication with a host computer.

6. A drilling transient electromagnetic instrument according to claim 5, characterized in that: The detection skeleton also includes a posture measurement module for measuring the working posture information of the detection pup joint, wherein the working posture information includes the azimuth angle, tool face angle and inclination angle of the detection pup joint.

7. The drilling transient electromagnetic instrument according to claim 3, characterized in that: The threaded nest and the battery cartridge connector are provided with an opening in the center, the power control circuit is provided with a power supply line, the power supply line passes through the opening in the center of the battery cartridge connector, and a power supply interface is provided at the end of the power supply line; the detection control module is provided with a receiving line, the receiving line passes through the center opening of the threaded nest, and a power receiving interface is provided at the end of the receiving line, and the power supply interface is matched and connected with the power receiving interface.

8. The drilling transient electromagnetic instrument according to claim 3, characterized in that: The power supply short section outer shell and the detection short section shell are made of glass fiber, and the drill pipe adapter head is made of non-magnetic steel material.

9. The drilling transient electromagnetic instrument according to claim 1, characterized in that: It also includes host computer software, which is used to establish a communication connection with the detection short section to set the working parameters of the drilling transient electromagnetic instrument, and is also used to read and analyze the measurement data of the drilling transient electromagnetic instrument.

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