CN113655533A - Sandstone-type uranium ore drilling transient electromagnetic logging device and logging method thereof - Google Patents
Sandstone-type uranium ore drilling transient electromagnetic logging device and logging method thereof Download PDFInfo
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- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/18—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging
- G01V3/26—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging operating with magnetic or electric fields produced or modified either by the surrounding earth formation or by the detecting device
- G01V3/28—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation specially adapted for well-logging operating with magnetic or electric fields produced or modified either by the surrounding earth formation or by the detecting device using induction coils
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- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
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Abstract
The application discloses a sandstone-type uranium deposit drilling transient electromagnetic logging device which comprises a probe tube, a transmitting device, a receiving device, an internal connecting piece and an external connecting piece, wherein the transmitting device, the receiving device, the internal connecting piece and the external connecting piece are arranged in the probe tube; the transmitting device is located in the middle of the interior of the probe tube, the number of the receiving devices is four, the four receiving devices are respectively distributed at two ends of the transmitting device, the transmitting device and the receiving devices are fixedly connected to the inner connecting piece together, and the transmitting device and the receiving devices are connected to the outer connecting piece through the inner connecting piece. The logging device is based on a full-space transient electromagnetic detection principle, and a detection coil is vertically arranged in a drilled hole and is well coupled with a geologic body, so that metal interference is avoided; the device adopts a one-transmitter-multiple-receiver device form, has flexible detection mode, can carry out multiple covering detection on geologic bodies with different depths, and can effectively improve the strength of induction signals and the signal-to-noise ratio by adding the magnetic core into the detection coil so as to obtain the electromagnetic field response characteristics of the geologic bodies at the periphery of the hole wall.
Description
Technical Field
The application belongs to the technical field of geophysical electromagnetic logging, and particularly relates to a sandstone-type uranium ore drilling transient electromagnetic logging detection device and a logging method thereof.
Background
The Transient Electromagnetic Method (TEM) is a time domain artificial source electromagnetic sounding method based on the electromagnetic induction principle. The method is characterized in that a step current excitation electromagnetic field is introduced into a transmitting return line, an induced electromagnetic field (secondary field) which changes along with time is generated by an underground geologic body under the excitation action of a primary field in the process that the excited primary pulse electromagnetic field propagates to an underground space, and the terrestrial features of different depths are obtained by extracting and analyzing secondary field signals through a receiving return line.
At present, with the realization of the aim of 'carbon neutralization' in China, the consumption of resources such as coal and the like is gradually reduced, so that green and clean nuclear energy gradually occupies an important position in the energy structure of China, and uranium ore is the most main raw material for developing the nuclear energy. From the last 90 s, the uranium exploration in China has been changed from "hard rock type" to "sandstone type" in the very wet north. Along with the rapid development of national defense science and technology and nuclear energy in China, the demand of uranium ores is increasing day by day.
Geophysical logging is based on physical property differences (radioactivity, electrical property, magnetism and the like) of rocks (ores) and is continuously measured in a drill hole at a certain speed to obtain logging parameters of a target body. The geophysical logging is an important geophysical exploration method for detecting sandstone-type uranium ores, and based on the geophysical logging response characteristics, the method finds out the ore-bearing layer position, the grade and the radioactive abnormal range of the uranium ores, deduces the development and the spatial distribution of sand bodies, analyzes the characteristics of the permeability of an ore-bearing aquifer and the like, and researches the relationship between the geophysical characteristics of a target layer for finding the sandstone-type uranium ores and uranium ores.
The transient electromagnetic method (BHTEM) for drilling hole uses multi-turn small coil as transmitting and receiving device, and places them in the drilling hole, and adopts different device forms to make successive observation from top to bottom or from bottom to top according to a certain step length, and the electromagnetic field has full space effect. The borehole transient electromagnetic method has the advantages that the detection coil is closer to the target body, the coupling with the geologic body is better, the response of the target body received by the receiving coil is stronger, the detection depth is larger, the vertical resolution ratio is higher, and the ground anti-interference capability is stronger.
The sandstone-type uranium ore drill hole is a vertical drill hole, conventional geophysical apparent resistivity logging information is only limited in the hole, and the electrical distribution condition of a geologic body at a certain depth on the periphery of the hole wall cannot be detected. The transient electromagnetic method has the advantages of high transverse resolution, small volume effect, low resistance, abnormal sensitivity and the like, can better infer the spatial distribution characteristics of ore-containing sand bodies by detecting in a drill hole, divides the lithology of strata, and analyzes the sampling analysis and the comprehensive research of ore physical property parameters related to uranium deposit resource reserve calculation. The conventional drilling transient electromagnetic method reduces the detection depth due to the fact that the detection device is small, the effective receiving area of the receiving coil directly influences the quality of the received transient electromagnetic signal, and large errors are generated in subsequent data processing and result interpretation analysis. The receiving coil has small effective area, the received transient electromagnetic induction signal is weak and has poor stability and low signal-to-noise ratio.
In the related art, the invention patent with application publication number CN112431586A discloses a method and a device for acquiring data in a borehole of a transient electromagnetic probe with a cable, wherein the transient electromagnetic probe is placed in a high-strength nylon drill rod, no conductive medium is arranged on two sides of the probe, and the transient electromagnetic probe connected with the cable is pushed and detected according to points by adopting a mode of pushing a short rod section by section. But the device is not cost-effective and less efficient for deeper borehole detection.
The invention patent with application patent publication numbers of CN111734404A and CN111434887A provides a transient electromagnetic array induction logging device, which adopts a one-shot eight-shot detection device to measure a target body at a certain depth for multiple times. However, the receiving coil of the device is positioned at the same side of the transmitting coil, and the detecting coil in the drill hole is smaller, so that the signals received by the receiving coil at the far side are relatively weaker; the detection coil is coaxially arranged with the drill hole, has poor coupling degree with a geological target, and is easily interfered by metal in the direction of a well head.
Patent publication No. CN209212233U discloses a transient electromagnetic logging device, which uses an overlapped loop device, and a magnetic core is embedded in the middle of a detection coil to focus an electromagnetic field generated by an excitation coil, so as to obtain a more effective detection signal. However, the device adopts a small loop overlapping device, so that the self-inductance and the turn-off time of the coil are increased, and a detection blind area with a certain depth is caused.
The drilling transient electromagnetic logging research in China is integrated, and the drilling transient electromagnetic logging tool is more applied to petroleum logging and is developed quickly. Although transient electromagnetic logging has more patents, the transient electromagnetic logging is less in the sandstone-type uranium deposit logging field, and has certain defects relative to sandstone-type uranium deposit drilling logging.
Disclosure of Invention
The purpose of this application is in order to overcome the not enough of above-mentioned device technique for electromagnetic response is better with the geologic body coupling, avoids metal interference, carries out many times to the different degree of depth geologic bodies and covers the detection, improves induction signal intensity and SNR, can acquire the peripheral geologic body electromagnetic field response characteristic of pore wall, in order to reach analysis uranium deposit resource reserves calculation relevant ore rerum natura parameter sampling analysis and comprehensive research.
In order to achieve the purpose, the application adopts one of the following technical schemes: a sandstone-type uranium deposit drilling transient electromagnetic logging device comprises a probe tube, a transmitting device, a receiving device, an internal connecting piece and an external connecting piece, wherein the transmitting device, the receiving device, the internal connecting piece and the external connecting piece are arranged in the probe tube; the transmitting device is located in the middle of the interior of the probe tube, the number of the receiving devices is four, the four receiving devices are respectively distributed at two ends of the transmitting device, the transmitting device and the receiving devices are jointly and fixedly connected to an internal connecting piece, and the transmitting device and the receiving devices are connected to the external connecting piece through the internal connecting piece.
Preferably, the probe tube is hollow cylindrical, one end of the probe tube is connected with a conical plastic shell, the other end of the probe tube is provided with a first protruding structure and a second protruding structure, and the outer wall of the first protruding structure is provided with threads.
Preferably, the transmitting device is formed by a first magnetic core coil; first magnetic core coil includes first magnetic core and the first coil of multiturn, first magnetic core is inlayed at the first coil center of multiturn, the axis coincidence of the axis of first magnetic core and the first coil of multiturn and both length are the same.
Preferably, receiving arrangement comprises second magnetic core coil, second magnetic core coil includes second magnetic core and multiturn second coil, the second magnetic core is inlayed at multiturn second coil center, second magnetic core axis and multiturn second coil axis coincidence and both length are the same.
Preferably, the first magnetic core and the second magnetic core are made of Mn-Zn ferrite materials.
Preferably, the internal connecting piece comprises a central shaft, the central shaft is located at the central axis of the probe tube, the central shaft is fixedly connected to the probe tube, a plurality of connecting holes are formed in the central shaft, and the plurality of connecting holes are distributed along the axial direction of the central shaft; the connecting hole is hollow cylinder, first magnetic core coil, second magnetic core coil pass connecting hole fixed connection.
Preferably, the first coil and the second coil are connected to the external connection member through the central shaft; one end in the external connecting piece is connected with a four-core communication cable connector, the other end is connected with a four-core communication cable, and the four-core communication cable is electrically connected with the first coil and the second coil through a central shaft.
Preferably, the inner wall of the external connecting piece is provided with an internal connecting hole; the second protruding structure is connected with an external connecting piece through the internal connecting hole.
Preferably, the inner wall of the external connecting piece is provided with an arch-shaped groove; the probe tube is connected to other logging probe tubes through the threads and the arched grooves on the outer wall of the first protruding structure.
In order to achieve the purpose, the application adopts the following two technical schemes: a sandstone-type uranium ore drilling transient electromagnetic logging method comprises S1, detailed understanding of drilling geology and hole body structure conditions before logging, and removing well head irrelevant objects to ensure well site safety;
s2, before the logging instrument is started, the matching degree of the voltage and the frequency of an external power supply and instrument equipment must be carefully checked; each switch and the knob are in a safe position, the wiring is correct, and the switch is electrified and started after the switch and the knob are repeatedly checked and confirmed to be correct;
s3, connecting the transient electromagnetic probe with other probes of the sandstone-type uranium deposit logging through external connectors to form a combined probe; before the probe is lowered into the well, the connection and sealing conditions of the probe are carefully checked, and a soft rubber waterproof adhesive tape and an electric insulating adhesive tape are generally sealed in a double-layer mode; a weak point is reserved at the joint of the probe tube and the cable, and the breaking strength of the weak point is not greater than one half of the maximum tensile force of the four-core communication cable;
s4, placing the sandstone-type uranium ore drilling transient electromagnetic logging device at the position of a sandstone-type uranium ore drilling well mouth, performing deep alignment, starting a transient electromagnetic host to supply power to a magnetic core transmitting coil, exciting to generate a primary field, starting a winch, controlling a descent probe at a certain speed to perform transient electromagnetic detection to acquire data, and receiving a secondary field signal with earth electricity information of a stratum at the periphery of a hole wall by using a magnetic core receiving device, wherein the secondary field signal is generated by switching off;
s5, controlling the descending speed of the four-core communication cable through a winch, and continuously measuring the four-core communication cable point by point along the sandstone-type uranium ore drill hole; the winch speed can be controlled for the stratum of the radioactive abnormal section, and the encrypted measurement is carried out on the stratum, so that the resolution is improved;
and S6, immediately lifting the transient electromagnetic logging device to be more than 0.5m after the underground exploring tube is lowered to the bottom of the hole, and simultaneously starting the upward lifting measurement operation as soon as possible.
Has the advantages that: 1. the device is characterized by comprising a probe tube, a transmitting device, a receiving device, an internal connecting piece and an external connecting piece, wherein the transmitting device, the receiving device, the internal connecting piece and the external connecting piece are arranged in the probe tube; the transmitting device is positioned in the middle of the interior of the probe tube, and the four receiving devices are respectively arranged at two ends of the transmitting device at a certain distance; the transmitting device and the receiving device are both coils wound on a hollow cylinder, a ferrite core probe is placed in the cylinder, and the transmitting device and the receiving device are connected to an internal connecting piece together; the receiving coil and the transmitting coil are connected to an external connecting piece of the embedded four-core communication cable through an internal connecting piece, and the probe tube can be connected to other logging probe tubes through the external connecting piece and is connected to the transient electromagnetic instrument through the communication cable. The logging device is based on a full-space transient electromagnetic detection principle, and a detection coil is vertically arranged in a drilled hole and is well coupled with a geologic body, so that metal interference is avoided; the device adopts a one-transmitter-multiple-receiver device form, has flexible detection mode, can carry out multiple covering detection on geologic bodies with different depths, and can effectively improve the strength of induction signals and the signal-to-noise ratio by adding the magnetic core into the detection coil so as to obtain the electromagnetic field response characteristics of the geologic bodies at the periphery of the hole wall.
2. The device is simple in structure and convenient to implement in the sandstone-type uranium ore drilling, and the external connecting piece adopted by the device can be connected with other probe tubes of the existing sandstone-type uranium ore logging, so that the logging efficiency is improved. Most importantly, the method can acquire the formation electrical characteristics of a certain depth at the periphery of the hole wall based on the electromagnetic induction principle, image in real time, better infer the ore sand-containing body space distribution characteristics, divide the formation lithology, analyze the ore physical property parameter sampling analysis and comprehensive research related to uranium deposit resource reserve calculation. In addition, the device also can be popularized and applied to hydrology drilling well logging and other metal nonmetal mineral exploration because of its transient electromagnetic method characteristic, and the practicality is strong.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, serve to provide a further understanding of the application and to enable other features, objects, and advantages of the application to be more apparent. The drawings and their description illustrate the embodiments of the invention and do not limit it. In the drawings:
fig. 1 is a schematic structural diagram of an embodiment of the present application.
Fig. 2 is a schematic structural diagram of a probe tube in an embodiment of the present application.
Fig. 3 is a schematic structural diagram of a first magnetic core coil in the embodiment of the present application.
Fig. 4 is a schematic structural diagram of a second core coil in the embodiment of the present application.
FIG. 5 is a schematic diagram of the internal connector structure of the logging device of the present invention.
FIG. 6 is a schematic diagram of an external connector configuration for a logging device according to the present invention.
In the figure: 1. a probe tube; 101. a plastic housing; 102. a first bump structure; 103. a second bump structure; 104. a thread; 2. a transmitting device; 3. a receiving device; 4. an internal connection; 401. a central shaft; 402. connecting holes; 5. an external connection; 501. a four-core communication cable joint; 502. a four-core communications cable; 503. an arcuate slot; 504. an inner connection hole; 6. a first magnetic core coil; 601. a first magnetic core; 602. a first coil; 7. a second magnetic core coil; 701. a second magnetic core; 702. a second coil.
Detailed Description
The present application is described in further detail below with reference to figures 1-6.
In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", and the like indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
The first embodiment is as follows: the embodiment of the application discloses a sandstone-type uranium deposit drilling transient electromagnetic logging device, which comprises a probe 1, a transmitting device 2, a receiving device 3, an internal connecting piece 4 and an external connecting piece 5, wherein the transmitting device 2, the receiving device 3, the internal connecting piece 4 and the external connecting piece are arranged in the probe 1; the probe 1 is made of a high-strength cylindrical hollow plastic shell; the transmitting device 2 is located in the middle of the interior of the probe tube 1, the receiving devices 3 are four, the four receiving devices 3 are respectively distributed at two ends of the transmitting device 2, the transmitting device 2 and the receiving devices 3 are fixedly connected to the inner connecting piece 4 together, and the transmitting device 2 and the receiving devices 3 are connected to the outer connecting piece 5 through the inner connecting piece 4.
The probe 1 is in a hollow cylindrical shape, one end of the probe 1 is connected with a conical plastic shell 101, the other end of the probe is provided with a first protruding structure 102 and a second protruding structure 103, and the outer wall of the first protruding structure 102 is provided with threads 104.
The transmitting device 2 is composed of 1 first magnetic core coil 6; first core coil 6 includes first core 601 and multiturn first coil 602, and first core 601 inlays in multiturn first coil 602 center, and the axis of first core 601 and the axis coincidence of multiturn first coil 602 and both lengths are the same.
The receiving device 3 is composed of a second magnetic core coil 7, the second magnetic core coil 7 comprises a second magnetic core 701 and a multi-turn second coil 702, the second magnetic core 701 is embedded in the center of the multi-turn second coil 702, the axis of the second magnetic core 701 is overlapped with the axis of the multi-turn second coil 702, and the lengths of the second magnetic core 701 and the multi-turn second coil 702 are the same.
The first magnetic core 601 and the second magnetic core 701 are made of Mn-Zn ferrite materials.
It should be noted that the diameter of the bore hole of the sandstone-type uranium ore is generally 113mm and 130mm, the inclination angle is 90 degrees, the bore hole is a straight hole, and the diameter of the probe tube of the logging device in the embodiment of the invention can be generally set to be 70mm and 80 mm. However, the embodiment of the present invention is not limited to this in view of the conditions of the borehole itself and the task of detection.
The logging device is based on the full-space transient electromagnetic detection principle, the detection coil is vertically arranged in a drilled hole and is well coupled with a geologic body, and metal interference is avoided; the device adopts a one-transmitter-multiple-receiver device form, has flexible detection mode, can carry out multiple covering detection on geologic bodies with different depths, and can effectively improve the strength of induction signals and the signal-to-noise ratio by adding the magnetic core into the detection coil so as to obtain the electromagnetic field response characteristics of the geologic bodies at the periphery of the hole wall.
The internal connecting piece 4 comprises a central shaft 401, the central shaft 401 is located on the central axis of the probe tube 1, the central shaft 401 is fixedly connected to the probe tube 1, a plurality of connecting holes 402 are formed in the central shaft 401, and the connecting holes 402 are distributed along the axial direction of the central shaft 401; the connection hole 402 has a hollow cylindrical shape, and the first core coil 6 and the second core coil 7 are fixedly connected to each other through the connection hole 402.
The first coil 602 and the second coil 702 are connected to the external connection member 5 through the center shaft 401; one end in the external connector 5 is connected with a four-core communication cable connector 501, the other end is connected with a four-core communication cable 502, and the four-core communication cable 502 is electrically connected with the first coil 602 and the second coil 702 through the central shaft 401.
The inner wall of the external connecting piece 5 is provided with an internal connecting hole 504; the second projection structure 103 is connected to the external connection member 5 through the internal connection hole 504.
The inner wall of the external connecting piece 5 is provided with an arch-shaped groove 503; the probe 1 is connected to other logging probes by the thread 104 and the arched groove 503 on the outer wall of the first protruding structure 102 and is connected to the transient electromagnetic instrument by a communication cable.
Example two: a sandstone-type uranium ore drilling transient electromagnetic logging method comprises S1, detailed understanding of drilling geology and hole body structure conditions before logging, and removing well head irrelevant objects to ensure well site safety;
s2, before the logging instrument is started, the matching degree of the voltage and the frequency of an external power supply and instrument equipment must be carefully checked; each switch and the knob are in a safe position, the wiring is correct, and the switch is electrified and started after the switch and the knob are repeatedly checked and confirmed to be correct;
s3, connecting the transient electromagnetic probe 1 with other probes of the sandstone-type uranium deposit logging through an external connecting piece 5 to form a combined probe; before the probe 1 is lowered into the well, the connection and sealing conditions of the probe 1 need to be carefully checked, and a soft rubber waterproof adhesive tape and an electric insulating adhesive tape are generally adopted for double-layer sealing; a weak point is reserved at the joint of the probe 1 and the cable, and the breaking strength of the weak point is not greater than one half of the maximum tensile force of the four-core communication cable 502;
s4, placing the sandstone-type uranium ore drilling transient electromagnetic logging device at the position of a sandstone-type uranium ore drilling well mouth, performing deep alignment, starting a transient electromagnetic host to supply power to a magnetic core transmitting coil, exciting to generate a primary field, starting a winch, controlling a descending probe 1 at a certain speed to perform transient electromagnetic detection to acquire data, and receiving a secondary field signal with earth electricity information of a peripheral stratum of a hole wall by using a magnetic core receiving device 3, wherein the secondary field signal is generated by switching off;
s5, controlling the descending speed of the four-core communication cable 502 through a winch, and continuously measuring point by point along the sandstone-type uranium ore drill hole; the winch speed can be controlled for the stratum of the radioactive abnormal section, and the encrypted measurement is carried out on the stratum, so that the resolution is improved;
and S6, immediately lifting the transient electromagnetic logging device to be more than 0.5m after the underground exploring tube is lowered to the bottom of the hole, and simultaneously starting the upward lifting measurement operation as soon as possible.
Finally, it should be noted that: the above description is only a preferred embodiment of the present application, and is not intended to limit the scope of the present application. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A sandstone-type uranium deposit drilling transient electromagnetic logging device is characterized by comprising a probe (1), a transmitting device (2) arranged in the probe (1), a receiving device (3), an internal connecting piece (4) and an external connecting piece (5);
the transmitting device (2) is located at the middle position inside the probe tube (1), the receiving devices (3) are four in number and four in number, the receiving devices (3) are respectively distributed at two ends of the transmitting device (2), the transmitting device (2) and the receiving devices (3) are fixedly connected to an internal connecting piece (4) together, and the transmitting device (2) and the receiving devices (3) are connected to an external connecting piece (5) through the internal connecting piece (4).
2. The sandstone-type uranium ore drilling transient electromagnetic logging device of claim 1, wherein: the probe tube (1) is in a hollow cylindrical shape, one end of the probe tube (1) is connected with a conical plastic shell (101), the other end of the probe tube is provided with a first protruding structure (102) and a second protruding structure (103), and the outer wall of the first protruding structure (102) is provided with threads (104).
3. The sandstone-type uranium ore drilling transient electromagnetic logging device of claim 1, wherein: the transmitting device (2) is formed by a first magnetic core coil (6); the first magnetic core coil (6) comprises a first magnetic core (601) and a multi-turn first coil (602), the first magnetic core (601) is embedded in the center of the multi-turn first coil (602), the axis of the first magnetic core (601) is overlapped with the axis of the multi-turn first coil (602), and the lengths of the first magnetic core and the multi-turn first coil are the same.
4. The sandstone-type uranium ore drilling transient electromagnetic logging device of claim 3, wherein: receiving arrangement (3) comprise second magnetic core coil (7), second magnetic core coil (7) include second magnetic core (701) and multiturn second coil (702), inlay in multiturn second coil (702) center second magnetic core (701), second magnetic core (701) axis and multiturn second coil (702) axis coincidence and both length are the same.
5. The sandstone-type uranium ore drilling transient electromagnetic logging device of claim 4, wherein: the first magnetic core (601) and the second magnetic core (701) are made of Mn-Zn ferrite materials.
6. The sandstone-type uranium ore borehole transient electromagnetic logging device of claim 4 or 5, wherein: the inner connecting piece (4) comprises a central shaft (401), the central shaft (401) is located at the central axis position of the probe tube (1), the central shaft (401) is fixedly connected to the probe tube (1), a plurality of connecting holes (402) are formed in the central shaft (401), and the connecting holes (402) are distributed along the axial direction of the central shaft (401); the connecting hole (402) is in a hollow cylindrical shape, and the first magnetic core coil (6) and the second magnetic core coil (7) penetrate through the connecting hole (402) to be fixedly connected.
7. The sandstone-type uranium ore drilling transient electromagnetic logging device of claim 6, wherein: the first coil (602) and the second coil (702) are connected to the external connection member (5) through the central shaft (401);
one end in the external connecting piece (5) is connected with four-core communication cable joint (501), and the other end is connected with four-core communication cable (502), four-core communication cable (502) pass through center pin (401) and first coil (602) and second coil (702) electric connection.
8. The sandstone-type uranium ore drilling transient electromagnetic logging device of claim 7, wherein: an inner connecting hole (504) is formed in the inner wall of the outer connecting piece (5); the second protruding structure (103) is connected with an external connecting piece (5) through the internal connecting hole (504).
9. The sandstone-type uranium ore drilling transient electromagnetic logging device of claim 8, wherein: an arch-shaped groove (503) is formed in the inner wall of the external connecting piece (5); the probe (1) is connected with other logging probes through threads (104) and arched grooves (503) on the outer wall of the first protruding structure (102).
10. A sandstone-type uranium ore drilling transient electromagnetic logging method is characterized by comprising the following steps: comprises that
S1, before logging, the drilling geology and the hole body structure condition are known in detail, and well-head unrelated objects are removed to ensure the safety of a well site;
s2, before the logging instrument is started, the matching degree of the voltage and the frequency of an external power supply and instrument equipment must be carefully checked; each switch and the knob are in a safe position, the wiring is correct, and the switch is electrified and started after the switch and the knob are repeatedly checked and confirmed to be correct;
s3, connecting the transient electromagnetic probe (1) with other probes of the sandstone-type uranium deposit well logging through an external connecting piece (5) to form a combined probe; before the probe (1) goes into the well, the connection and sealing conditions of the probe (1) need to be carefully checked, and a soft rubber waterproof adhesive tape and an electric insulating adhesive tape are generally adopted for double-layer sealing; a weak point is reserved at the joint of the probe tube (1) and the cable, and the breaking strength of the weak point is not more than one half of the maximum tensile force of the four-core communication cable (502);
s4, placing the sandstone-type uranium ore drilling transient electromagnetic logging device at the position of a sandstone-type uranium ore drilling well mouth, performing deep alignment, starting a transient electromagnetic host to supply power to a magnetic core transmitting coil, exciting to generate a primary field, starting a winch, controlling a descending probe pipe (1) at a certain speed to perform transient electromagnetic detection to acquire data, and receiving a secondary field signal with earth electricity information of a stratum at the periphery of a hole wall, which is generated by switching off, by using a magnetic core receiving device (3);
s5, controlling the descending speed of the four-core communication cable (502) through a winch, and continuously measuring the drilling holes of the sandstone-type uranium ores point by point; the winch speed can be controlled for the stratum of the radioactive abnormal section, and the encrypted measurement is carried out on the stratum, so that the resolution is improved;
and S6, immediately lifting the transient electromagnetic logging device to be more than 0.5m after the underground exploring tube is lowered to the bottom of the hole, and simultaneously starting the upward lifting measurement operation as soon as possible.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115288666A (en) * | 2022-07-04 | 2022-11-04 | 吉林大学 | Nuclear magnetic logging while drilling instrument probe with separated transmitting and receiving coils |
| CN117328860A (en) * | 2023-08-30 | 2024-01-02 | 核工业二0三研究所 | Positioning method for grey uranium-rich reduced geologic body in red clastic rock construction |
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| CN206564328U (en) * | 2017-03-22 | 2017-10-17 | 中南大学 | Transient electromagnetic exploration integrated dual-mode antenna rod and measurement apparatus |
| CN109209363A (en) * | 2018-09-14 | 2019-01-15 | 天津大学 | Cross casing stratum differential resistance rate well-logging probe structure |
| CN110244368A (en) * | 2019-07-09 | 2019-09-17 | 中国矿业大学(北京) | Scanning probe device and method in a kind of hole based on electromagnetic induction principle |
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| CN115288666A (en) * | 2022-07-04 | 2022-11-04 | 吉林大学 | Nuclear magnetic logging while drilling instrument probe with separated transmitting and receiving coils |
| CN117328860A (en) * | 2023-08-30 | 2024-01-02 | 核工业二0三研究所 | Positioning method for grey uranium-rich reduced geologic body in red clastic rock construction |
| CN117328860B (en) * | 2023-08-30 | 2024-04-16 | 核工业二0三研究所 | Positioning method for grey uranium-rich reduced geologic body in red clastic rock construction |
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