Novel probe mechanical structure of drilling-tool-passing lithologic density logging instrument

Abstract

The invention discloses a novel probe mechanical structure of a drilling-tool-passing lithologic density logging instrument, and belongs to the technical field of drilling-tool-passing logging. Belongs to the technical field of through-drilling-tool well logging. The probe core group can better realize fixation and shock absorption of long and short gamma detectors and adjustability of source spacing; a probe short tail cone on the probe shell group adopts a small-gradient long-distance arc structure for relatively smooth transition, so that when the instrument logging density probe is pushed out, if the instrument needs to be lowered, the probe is prevented from being clamped and can smoothly slip, and the logging safety of the density probe is protected; and the source packaging group adopts a new 5700 type source structure, so that generalization and unification of a radioactive source and a system instrument are realized, and the instrument can be more conveniently and economically applied in a block with the 5700 type source. In addition, three different locking devices can be provided according to well conditions and construction process probes. In a word, the novel probe mechanical structure of the drilling-tool-passing lithologic density logging instrument can be applied to deeper and more complex well conditions more safely, and the measurement effect is better.

Description

Technical Field

[0001] The invention belongs to the technical field of through-drilling tool logging and relates to a novel through-drilling tool lithology density logging instrument probe mechanical structure. Background Art

[0002] The lithology density logging tool uses gamma spectrum analysis to distinguish Compton scattering from photoelectric effect. The gamma source emits gamma rays to the formation, and two long and short detectors with different source distances are used to measure the intensity and energy of the gamma rays after attenuation by the formation. The medium-energy gamma rays emitted by the gamma source mainly produce the Compton effect, which is used to measure the rock density; the gamma rays with energy attenuation in the formation produce the photoelectric effect, which can be used to measure the rock properties of the formation. The electron density and photoelectric absorption index of the formation are calculated to determine the volume density and lithology of the formation. Two detectors with different source distances are used to reduce the influence of the wellbore diameter and wellbore mud cake on the measurement results. The wellbore diameter is measured at the same time for wellbore correction.

[0003] In recent years, as unconventional and tight oil and gas reservoir resources have become new oil and gas growth points, the exploration and development of shale gas and tight oil and gas has continued to deepen. Horizontal wells have become the main development method of unconventional oil and gas. Long horizontal wells, deep wells, and casing inside drilling have increased year by year. The drilling rig drilling tool combination has become more complicated and non-standardized, and the water hole has become smaller, resulting in the inability of traditional logging (small diameter) instruments and tool technology to meet the needs of improving quality and efficiency. Ultra-small diameter logging instruments that pass through drilling tools are urgently needed. In highly deviated wells, complex wells, and horizontal wells, the "through drilling tools, through drill bits, and external storage logging technology to replace wet joint horizontal well tools" are used to reduce well occupation time, and at the same time actively support drilling speed-up. The single well logging time is only one-third of the conventional drilling tool transmission logging, and the risk of using radioactive sources is significantly reduced.

[0004] As the depth of oil and gas wells has gradually increased in recent years, higher requirements have been placed on the temperature and pressure indicators of instruments. Lithology density instruments are limited to 150°C and 103Mpa, which can no longer meet the needs of on-site deep well detection. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that the existing mechanical structure of the probe in the prior art cannot meet the requirements of deep well condition detection, and to provide a novel mechanical structure of the probe of the through-drilling tool lithology density logging instrument.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] The invention proposes a novel mechanical structure of a through-drilling tool lithology density logging instrument probe, comprising a probe electronic instrument core and a probe core group, wherein the probe core group is mounted on the probe electronic instrument core, and a probe shell group is mounted outside the probe core group; the probe electronic instrument core and the probe shell group are connected via a probe outer tube short joint;

[0008] The probe core group includes a short detector, a detector connecting tube and a long detector which are sequentially installed in the probe shell group; a detector shell is arranged outside the short detector, the detector connecting tube and the long detector, and a disc spring is arranged at one end of the detector shell.

[0009] Preferably, a first detector positioning pad and a second detector positioning pad are provided at the other end of the detector housing.

[0010] Preferably, the probe electronic instrument core includes a probe electronic short outer tube, a probe frame, a high-voltage front amplifier board and a multi-core pressure-bearing connector. The high-voltage front amplifier board is installed at the I-shaped position of the probe I-shaped frame, the multi-core pressure-bearing connector is installed at the end of the probe I-shaped frame, and the probe electronic short outer tube is installed on the outside of the probe frame, the high-voltage front amplifier board and the multi-core pressure-bearing connector.

[0011] Preferably, the probe electronic short outer tube and the probe outer shell assembly are both connected to the probe outer tube short joint, and a probe wear block is provided on the probe outer tube short joint, and the probe wear block is located on the side of the probe that is close to the well wall.

[0012] Preferably, the probe housing group comprises a probe housing, on which a long source distance window, a short source distance window and a source window cover with a card are arranged; and a short probe tail vertebra is arranged at one end of the probe housing.

[0013] Preferably, the short source distance window is in the shape of a sealed 45° inclined plug.

[0014] Preferably, the long source distance window is made of TC18, and the short source distance window and the card source window cover are both made of PEEK.

[0015] Preferably, an active packaging group is installed on the probe housing group;

[0016] The source packaging group includes a source bin, a 5700 type source is arranged inside the source bin, the source bin is fixed to the probe housing by a source bin screw, a source pressure cover is arranged outside the source bin, one end of the source pressure cover is fixed to the source bin by a cylindrical head screw, a first fixing block and a second fixing block are fixed to the probe housing by a first elastic cylindrical pin, a fixing block sleeve is arranged in the first fixing block, and the other end of the source pressure cover is fixed to the fixing block sleeve by a source bin screw with a hole; the source pressure cover is rotated and fixed to the second fixing block by a source cover pin shaft and a second elastic cylindrical pin; the source pressure cover is opened and closed with the source cover shaft pin as the axis.

[0017] Preferably, the material of the fixed block sleeve is 0cr17Ni4Cu4Nb, and the material of the source pressure cover, source chamber and fixed block are all 95WNiFe.

[0018] Preferably, the probe housing assembly is made of tungsten-nickel-iron alloy.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The invention proposes a novel mechanical structure of a probe for a through-drilling tool lithology density logging instrument. The probe core group can better realize the fixation and vibration reduction of the long and short gamma detectors, and the adjustability of the source distance; the long and short detectors are two-way gamma detectors of long and short paths, wherein the gamma detector is composed of a sodium iodide crystal and a photomultiplier tube. The sodium iodide crystal should be used in conjunction with the photomultiplier tube, and the photomultiplier tube is an electronic device that can perform both photoelectric conversion and photoelectron amplification, and generally has an amplification factor of 10 8 times. In this way, when gamma rays enter the sodium iodide crystal, the crystal will convert part or all of the ray energy into visible light. This extremely weak flickering light is coupled through one end face of the crystal and enters the photocathode of the photomultiplier tube. The photocathode of the photomultiplier tube is extremely sensitive to light. Even a single photon, as long as it has enough energy, will stimulate photoelectrons when it hits the photocathode. After the photoelectron is amplified by the photomultiplier tube, the output electrical pulse signal can be processed by a general electronic circuit. The probe shell group realizes the fixation of the probe core group, the shielding of the long and short detectors, the directional emission and reception of gamma rays, and the connection with the external pusher component. Through the combination of the probe electronic instrument core, the probe core group and the probe shell group, the temperature and pressure indicators can reach 140MPa, 175℃, which is suitable for deeper well conditions and can solve the problems existing in the existing technology.

[0021] Furthermore, the probe housing is made of tungsten-nickel-iron alloy, which is different from the stainless steel housing plus shielding block of similar instruments. It has a better shielding effect on the gamma rays coming directly from the radiation source, making the gamma rays received by the detector purer and more resistant to interference after being attenuated by the formation. At the same time, the mechanical assembly of the instrument is more convenient. The short source distance window is a sealed 45° inclined polymer plug.

[0022] Furthermore, the short tail vertebra of the probe on the probe shell assembly adopts a small slope and long distance arc structure with a relatively smooth transition. This unique design detail allows the instrument logging density probe to be pushed out and, if the instrument needs to be lowered, avoid getting stuck and can be smoothly slipped off, thereby protecting the logging safety of the density probe.

[0023] Furthermore, a probe wear block is provided, the size of which is slightly larger than the outer diameter of the probe housing. When the instrument rubs against the well wall, the wear block rubs first and takes effect, thereby extending the wear life of the probe housing.

[0024] Furthermore, the 5700 source is used to achieve standardization and universalization of the instrument series, and the field use is more convenient and economical. Currently, no other through-hole lithology density logging tool probe is known to use this source packaging structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 This is a mechanical structure diagram of the new through-drilling tool lithology density logging instrument probe of the present invention.

[0027] Figure 2 This is a structural diagram of the probe electronic core of the present invention.

[0028] Figure 3 This is a structural diagram of the probe core group of the present invention.

[0029] Figure 4 1 is a structural diagram of the probe housing assembly of the present invention ((a) is a front view of the probe housing assembly, and (b) is a top view of the probe housing assembly).

[0030] Figure 5 This is a structural diagram of the connection of the probe electronic short outer tube of the present invention ((a) is a connection diagram of the probe electronic short outer tube and the probe shell assembly, (b) is a structural diagram of the connection sleeve, and (c) is a structural diagram of the cylindrical head screw).

[0031] Figure 6 This is a structural diagram of the source packaging group of the present invention.

[0032] Figure 7 It is a structural diagram of the semi-locking device of the probe of the present invention.

[0033] Figure 8 It is the structural diagram of the full locking device of the probe of the present invention.

[0034] Among them: 21 probe electronic instrument core, 22 probe core group, 23 probe shell group, 24 source packaging group, 31 probe electronic short outer tube, 32 probe frame, 33 high voltage front amplifier board, 34 multi-core pressure-bearing connector, 41 disc spring, 42 long detector, 43 detector shell, 44 detector connecting tube, 45 short detector, 46 first detector adjustment pad, 47 second detector adjustment pad, 51 probe shell, 52 long source distance window, 53 short source distance window, 54 source window cover with card, 55 probe short tail cone, 56 probe connecting pin, 57 cylindrical pin, 61 connecting sleeve, 62 probe wear block, 63 cylindrical head screw, 64 probe outer tube short joint, 71 Type 5700 source, 710 fixed block sleeve, 711 first fixed block, 712 source cover pin, 713 second elastic cylindrical pin, 72 source screw, 73 second fixed block, 74 first elastic cylindrical pin, 75 source pressure cover, 76 cylindrical head screw, 77 source bin, 78 source bin screw, 79 source bin screw with hole, 81 probe pulling screw, 82 probe pulling spring, 83 first O-ring, 84 probe pulling rod, 85 probe inlay screw, 86 second O-ring, 87 probe caudal vertebrae inlay. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0038] In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed when in use, it is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0039] In addition, if the term "horizontal" appears, it does not mean that the component must be absolutely horizontal, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0040] In the description of the embodiments of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0042] The invention proposes a novel mechanical structure of a through-drilling tool lithology density logging instrument probe, such as Figures 1 to 6 As shown, it includes a probe electronic core 21 and a probe core group 22. The probe core group 22 is installed on the probe electronic core 21, and a probe shell group 23 is installed outside the probe core group 22; the probe electronic core 21 and the probe shell group 23 are connected through a probe outer tube short joint 64; the probe shell group 23 is made of tungsten-nickel-iron alloy.

[0043] The probe electronic instrument core 21 includes a probe electronic short outer tube 31, a probe frame 32, a high-voltage front amplifier board 33 and a multi-core pressure-bearing connector 34. The high-voltage front amplifier board 33 is installed on one side of the probe I-shaped frame 32, i.e., the I-shaped position, and the multi-core pressure-bearing connector 34 is installed on the other side of the probe I-shaped frame 32, i.e., the end, and the probe electronic short outer tube 31 is installed outside the probe frame 32, the high-voltage front amplifier board 33 and the multi-core pressure-bearing connector 34. The probe electronic short outer tube 31 and the probe shell assembly 23 are both connected to the probe outer tube short joint 64, and a probe wear-resistant block 62 is provided on the probe outer tube short joint 64. The probe wear-resistant block 62 is located on the side of the probe that is close to the well wall.

[0044] The probe core group 22 includes a short detector 45, a detector connecting tube 44 and a long detector 42 which are sequentially installed in the probe shell group 23; a detector shell 43 is provided outside the short detector 45, the detector connecting tube 44 and the long detector 42, a disc spring 41 is provided at one end of the detector shell 43, and a first detector adjustment pad 46 and a second detector adjustment pad 47 are provided at the other end.

[0045] like Figure 4 (a) is a front view of the probe housing assembly, and (b) is a top view of the probe housing assembly. The probe housing assembly 23 includes a probe housing 51, on which a long source distance window 52, ​​a short source distance window 53 and a source window cover 54 with a card are provided; a probe short tail vertebra 55 is provided at one end of the probe housing 51. Among them, the short source distance window 53 is in the shape of a sealed oblique 45° plug. The long source distance window 52 is made of TC18, and the short source distance window 53 and the source window cover 54 with a card are both made of PEEK.

[0046] The source packaging group 24 is installed on the probe housing group 23; the source packaging group 24 includes a source bin 77, a 5700-type source 71 is arranged inside the source bin 77, the 5700-type source 71 is tightened and fixed to the source bin 77 by a source screw 72, the source bin 77 is fixed to the probe housing 51 by a source bin screw 78, a source pressure cover 75 is arranged outside the source bin 77, one end of the source pressure cover 75 is fixed to the source bin 77 by a cylindrical head screw 76, a first fixing block 711 and a second fixing block 73 are fixed to the probe housing 51 by a first elastic cylindrical pin 74, a fixing block sleeve 710 is arranged in the first fixing block 711, and the other end of the source pressure cover 75 is fixed to the fixing block sleeve 710 by a source bin screw 79 with a hole; the source pressure cover 75 is rotated and fixed with the second fixing block 73 by a source cover pin shaft 712 and a second elastic cylindrical pin 713; the source pressure cover 75 is opened and closed with the source cover shaft pin 712 as the axis. Among them, the material of the fixed block sleeve 710 is 0cr17Ni4Cu4Nb, and the material of the source pressure cover 75, the source bin 77 and the fixed block 711 are all 95WNiFe. The source pressure cover 75 is tightened and fixed on the source bin 77 by two hexagon socket head screws 76, and its model is M4*10; the first fixed block 711 and the second fixed block 73 are fixed on the density probe housing 51 by two first elastic cylindrical pins 74, and its model is 5*30; the size of the second elastic cylindrical pin 713 is 2*8. To disassemble and assemble the 5700 type source of this probe mechanical structure, one source screw 72, one source bin screw 78, and two source bin screws 79 with holes need to be disassembled and assembled.

[0047] Specifically, the probe electronic instrument core 21 is connected to the outside circuit through a multi-core pressure-bearing connector 34. The high-voltage preamplifier board 33 is fixed to the probe I-shaped frame 32 by 4 M3X8 cylindrical head screws. The high-voltage preamplifier board 33 is a DHP, which is mainly divided into two parts: detector high voltage generation and long and short source distance detector gamma signal preamplification, and is composed of a high-voltage module and a long and short path preamplifier module. The high-voltage module is a voltage-controlled high-voltage output. Under the action of the high-voltage control signal, it outputs positive high voltage (+HV, range +1000VDC~+1500VDC), and is connected to the dynode (multiplier) of the long and short path detector photomultiplier tube. The preamplifier circuit amplifies the electronic pulse from the detector photomultiplier tube, obtains the pulse signal of the long and short path, and then sends it to the next level for processing. The high-voltage preamplifier board DHP is placed on the probe I-shaped frame, located inside the density instrument probe, close to the detector, which helps to improve the measurement accuracy.

[0048] The probe core group 22 is mainly a carrier for placing long and short detectors, and can fix, shield, dampen and fine-tune the source distance of the long and short detectors. The long detector 42 and the short detector 45 are respectively screwed on both sides of the detector connecting tube 44 by threads. The detector connecting tube 44 and the detector housing 43 are made of tungsten nickel iron, which has a shielding effect. The first detector adjustment pad 46 has a thickness of 0.5mm, and the second detector adjustment pad 47 has a thickness of 1mm. The first detector adjustment pad 46 and the second detector adjustment pad 47 can be increased or decreased in number at any time according to the scale effect to achieve the adjustability of the long and short source distances. The disc spring 41 finally presses the entire probe core group to play a fixing and damping role. The long and short detectors are long-channel and short-channel two-way gamma detectors, in which the gamma detector is composed of a sodium iodide crystal and a photomultiplier tube. It is a separate system with a voltage divider resistor, a load resistor, a coupling capacitor, etc. The sodium iodide crystal must be used in conjunction with a photomultiplier tube, which is an electronic device that can perform both photoelectric conversion and photoelectron amplification, with a general amplification factor of 10. 8 times. In this way, when the gamma ray enters the sodium iodide crystal, the crystal will convert part or all of the ray energy into visible light (or scintillation light). This extremely weak scintillation light is coupled through one end face of the crystal and enters the photocathode of the photomultiplier tube. The photocathode of the photomultiplier tube is extremely sensitive to light. Even a single photon, as long as it has enough energy, will stimulate photoelectrons when it hits the photocathode. After the photoelectrons are amplified by the photomultiplier tube, the output electrical pulse signal can be processed by ordinary electronic circuits.

[0049] The probe shell group 23 fits the well wall to achieve the fixation of the probe core group 22, the shielding of the long and short detectors, the directional emission and reception of gamma rays, and the connection with the external pusher component. The probe shell group 23 is made of tungsten-nickel-iron alloy as a whole. Different from the stainless steel shell plus shielding block mode of similar instruments, it has a better shielding effect on the gamma rays directly coming from the radiation source, making the gamma rays received by the detector after being attenuated by the formation purer and more anti-interference. At the same time, the mechanical assembly of the instrument is more simplified. The long source distance window 52 is made of titanium alloy, and is fixed to the probe shell 51 by the long source window pressure plate made of tungsten-nickel-iron material. The long source distance window 52 is made of TC18, and the short source distance window 53 and the card source window cover 54 are all made of PEEK. The short source distance window 53 is a sealed plug made of a 45° polymer material. The short tail vertebra 55 of the probe on the probe shell group 23 is fixed together by two probe connecting pins 56 and a 4x20 cylindrical pin 57. The small slope and long distance arc structure has a relatively smooth transition. This unique design detail allows the instrument's logging density probe to be pushed out and, if the instrument needs to be lowered, to avoid the probe getting stuck and to slide off smoothly, thus protecting the logging safety of the density probe.

[0050] like Figure 5 As shown, (a) is a connection diagram of the probe electronic short outer tube and the probe shell assembly, (b) is a structural diagram of the connection sleeve, and (c) is a structural diagram of the cylindrical head screw. The probe electronic short outer tube 31 and the probe shell 51 are connected to the probe outer tube short joint 64 through four connection sleeves 61 and four M4X8 cylindrical head screws 63, respectively, so that the probe electronic short outer tube 31 and the probe shell 51 are connected as a whole. There is a probe wear block 62 on the probe outer tube short joint 64, which is located on the side of the probe against the well wall and is slightly larger than the outer diameter of the probe shell. When the instrument is rubbed against the well wall, the wear block first takes effect by friction, which can extend the wear life of the probe shell 51.

[0051] The source packaging group 24 is mainly used to fix and disassemble the source. The new through-hole tool lithology density logging instrument probe adopts the 5700 type source 71, which realizes the standardization and universalization of the instrument series, and is more convenient and economical to use on site. At present, it is known that no other through-hole tool lithology density logging instrument probe adopts this source packaging structure.

[0052] When the instrument is lowered into the well, there are three types of locking mechanisms between the probe of the new through-hole tool lithology density logging instrument and the density pusher body. One is a half-locking device, that is, the probe can be pushed out halfway. One is a full-locking device, that is, the probe cannot be pushed out. One is that no accessories are installed, that is, the probe can be pushed out completely. The appropriate probe mechanism is selected on site according to the well conditions and construction technology. Figure 7 As shown, it is a half-locking device of the probe, that is, the probe can be pushed out halfway, including a probe pulling screw 81, a probe pulling spring 82, a first O-ring AS568-010 83, and a probe pulling rod 84; Figure 8As shown, it is a full lock device of the probe, that is, the probe cannot be pushed out, including the probe inlay screw 85, the second O-ring AS568-012 86, and the probe tail vertebra inlay 87. The other is to keep the hole open without any accessories, that is, the probe can be pushed out completely. The appropriate probe mechanism is selected on site according to the well conditions and construction technology.

[0053] The mechanical structure of a new type of through-drilling tool lithology density logging instrument probe proposed by the present invention can reach a temperature and pressure index of 140MPa and 175℃, which is suitable for deeper well conditions; the probe core group 22 can better realize the fixation and shock absorption of the long and short gamma detectors, and the adjustability of the source distance; the design of the wear-resistant block 62 makes the instrument probe shell 51 have a longer service life; the integrated tungsten-nickel-iron material probe shell 51 can better shield the gamma rays directly coming from the radioactive source, and has better anti-interference performance; the probe short tail vertebra 55 on the probe shell group 23 adopts a relatively smooth transition with a small slope and long distance arc structure. When the instrument logging density probe is pushed out, if the instrument needs to be lowered, the probe can be smoothly slipped off to avoid being stuck, and the logging safety of the density probe can be protected; the source packaging group 24 adopts the new structure of the 5700 source 71, which realizes the universalization and unification of the radioactive source and the EILog system instrument, so that the instrument can be used more conveniently and economically in the block with the 5700 source 71. In addition, according to the well conditions and construction process, the probe can provide three different locking devices. In short, this new through-hole lithology density logging instrument probe mechanical structure can be used more safely and with better measurement effects in deeper and more complex well conditions.

[0054] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A novel mechanical structure of a probe for a through-hole lithology density logging instrument, characterized in that: The probe comprises a probe electronic instrument core (21) and a probe core group (22), wherein the probe core group (22) is mounted on the probe electronic instrument core (21), and a probe outer shell group (23) is mounted outside the probe core group (22); the probe electronic instrument core (21) and the probe outer shell group (23) are connected via a probe outer tube short joint (64); The probe core group (22) comprises a short probe (45), a probe connecting tube (44) and a long probe (42) which are sequentially installed in the probe shell group (23); a probe shell (43) is provided outside the short probe (45), the probe connecting tube (44) and the long probe (42), and a disc spring (41) is provided at one end of the probe shell (43).

2. The mechanical structure of the new through-drilling tool lithology density logging instrument probe according to claim 1 is characterized in that: A first detector positioning pad (46) and a second detector positioning pad (47) are provided at the other end of the detector housing (43).

3. The mechanical structure of the new through-drilling tool lithology density logging instrument probe according to claim 1 is characterized in that: The probe electronic instrument core (21) comprises a probe electronic short outer tube (31), a probe frame (32), a high-voltage front amplifier board (33) and a multi-core pressure-bearing connector (34); the high-voltage front amplifier board (33) is installed at an I-shaped position of the probe I-shaped frame (32); the multi-core pressure-bearing connector (34) is installed at the end of the probe I-shaped frame (32); and the probe electronic short outer tube (31) is installed outside the probe frame (32), the high-voltage front amplifier board (33) and the multi-core pressure-bearing connector (34).

4. The mechanical structure of the new through-drilling tool lithology density logging instrument probe according to claim 3 is characterized in that: The probe electronic short outer tube (31) and the probe outer shell assembly (23) are both connected to the probe outer tube short joint (64), and a probe wear-resistant block (62) is provided on the probe outer tube short joint (64). The probe wear-resistant block (62) is located on the side of the probe that is close to the well wall.

5. The mechanical structure of the new through-drilling tool lithology density logging instrument probe according to claim 1 is characterized in that: The probe housing group (23) comprises a probe housing (51), on which a long source distance window (52), a short source distance window (53) and a source window cover with a card (54) are provided; and a short probe tail vertebra (55) is provided at one end of the probe housing (51).

6. The novel through-drilling tool lithology density logging instrument probe mechanical structure according to claim 5 is characterized in that: The short source distance window (53) is in the shape of a sealed 45° inclined plug.

7. The novel through-drilling tool lithology density logging instrument probe mechanical structure according to claim 5 is characterized in that: The long source distance window (52) is made of TC18, and the short source distance window (53) and the card source window cover (54) are both made of PEEK.

8. The novel through-drilling tool lithology density logging instrument probe mechanical structure according to claim 5 is characterized in that: An active packaging group (24) is installed on the probe housing group (23); The source packaging group (24) comprises a source bin (77), a 5700 type source (71) is arranged inside the source bin (77), the source bin (77) is fixed to the probe housing (51) by a source bin screw (78), a source pressure cover (75) is arranged outside the source bin (77), one end of the source pressure cover (75) is fixed to the source bin (77) by a cylindrical head screw (76), and a first fixing block (711) is fixed to the probe housing (51) by a first elastic cylindrical pin (74). ) and a second fixed block (73), wherein the first fixed block (711) is provided with a fixed block sleeve (710), and the other end of the source pressure cover (75) is fixed to the fixed block sleeve (710) by a source bin screw (79) with a hole; the source pressure cover (75) is rotated and fixed with the second fixed block (73) by a source cover pin shaft (712) and a second elastic cylindrical pin (713); the source pressure cover (75) is opened and closed with the source cover shaft pin (712) as the axis.

9. The novel through-drilling tool lithology density logging instrument probe mechanical structure according to claim 8, characterized in that: The material of the fixed block sleeve (710) is 0cr17Ni4Cu4Nb, and the material of the source pressure cover (75), the source chamber (77) and the fixed block (711) are all 95WNiFe.

10. The novel through-drilling tool lithology density logging instrument probe mechanical structure according to claim 1 is characterized in that: The probe housing assembly (23) is made of tungsten-nickel-iron alloy.

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