Lithologic density logging instrument

Abstract

The invention provides a lithologic density logging instrument. The lithologic density logging instrument comprises a pushing detector section, a spring plate assembly and an electronic circuit section, the pushing detector section is used for collecting logging data of a to-be-detected petroleum well; the spring plate assembly is arranged on the pushing detector section and is used for providing elastic force when being pressed so as to enable the pushing detector section to be close to the well wall of the to-be-detected petroleum well; the electronic circuit section is connected with the pushing detector section and used for converting logging data collected by the pushing detector section into electric signals and sending the electric signals to a far-end server. Compared with the prior art, the spring plate assembly is arranged on the pushing detector section to replace a motor to drive the contraction positioning device, and when the spring plate assembly is pressed, elastic force is provided to enable the pushing detector section to be close to the well wall of the to-be-detected petroleum well; the problem that in the prior art, a motor-driven contraction positioning device is adopted for a lithologic density logging instrument, and measurement cannot be conducted under the deep well condition is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of petroleum logging instruments, and more particularly, to a litho-density logging tool. Background Art

[0002] A litho-density logging tool is a nuclear logging tool for measuring the bulk density and photoelectric absorption index of a formation. Its measurement principle is that the gamma rays from the Cs-136 radiation source in the tool interact with the electrons in the atoms of the formation material. The interaction between the gamma rays and the formation material electrons mainly occurs through the Compton effect and the photoelectric effect. The Compton effect reflects the electron density of the formation material, and the electron density of the material is a direct reflection of the material density. The strength of the photoelectric effect reflects the lithology of the formation rock.

[0003] Existing litho-density logging tools use a retractable positioning device driven by a motor, and can only perform logging when the downhole temperature does not exceed 230°C and the pressure does not exceed 175 MPa. However, as the logging depth increases, the pressure and temperature also increase continuously, reaching a high temperature of 260°C and a high pressure of 206 MPa. The operation of the retractable positioning device is severely hindered in deep well conditions, and existing logging tools can no longer meet the measurement requirements of such deep well conditions. Summary of the Invention

[0004] The main object of the present invention is to provide a litho-density logging tool to at least solve the problem that the existing litho-density logging tool using a motor-driven retractable positioning device cannot measure in deep well conditions.

[0005] The present invention provides a litho-density logging tool, comprising:

[0006] A push-against detector section for collecting logging data of an oil well to be measured;

[0007] A spring plate assembly provided on the push-against detector section, the spring plate assembly being used to provide an elastic force when pressed to make the push-against detector section close to the well wall of the oil well to be measured;

[0008] An electronic circuit section connected to the push-against detector section, the electronic circuit section being used to convert the logging data collected by the push-against detector section into an electrical signal and send it to a remote server.

[0009] In one embodiment, the spring plate assembly includes a spring plate, and the spring plate is bow-shaped; both ends of the spring plate are respectively installed at both ends of the push-against detector section along the length direction.

[0010] In one embodiment, the spring plate assembly further includes:

[0011] Two hinges, and the two hinges are respectively provided at both ends of the spring plate along the length direction;

[0012] Pins, two of which are provided, and the two pins are respectively arranged at the ends of the two hinges;

[0013] Pin shafts, two of which are provided, and the two pin shafts are respectively arranged in the two pins along the thickness direction of the spring plate and fixed at both ends of the push detector section along the length direction.

[0014] In one embodiment, the spring plate assembly further includes a wear-resistant block assembly, which is arranged in the middle of the spring plate. The upper surface of the wear-resistant block assembly is provided with a roller and a wheel shaft, and the roller is used to reduce friction.

[0015] In one embodiment, the push detector section includes:

[0016] A probe housing, on which an anti-wear plate and a beryllium window are provided, and the beryllium window is fixed to the probe housing through a beryllium window cover plate;

[0017] A probe housing assembly, which is arranged in the probe housing, and the probe housing assembly is used to install a density radiation source and emit gamma rays to the well wall;

[0018] A core assembly, which is used to receive the reflected rays of the well wall, convert the reflected rays into the electrical signals and transmit them downward;

[0019] Skid assemblies, two of which are provided, and the two skid assemblies are respectively arranged at both ends of the upper part of the probe housing along the length direction. Two chutes are provided on the two skid assemblies;

[0020] Wherein, the spring plate assembly is arranged in the chutes of the two skid assemblies.

[0021] In one embodiment, the push detector section further includes:

[0022] A push detector section plug and socket assembly, which is arranged at one end inside the probe housing;

[0023] A push detector section lower plug, which is arranged at one end of the probe housing along the length direction and is connected to the push detector section plug and socket assembly;

[0024] A push detector section upper joint assembly, which is arranged at the other end of the probe housing along the length direction;

[0025] A push detector section upper protective cap, which is connected to the push detector section upper joint assembly.

[0026] In one embodiment, an embedding hole is formed in the upper surface of the probe housing. The probe housing assembly includes a source bin which is installed in the embedding hole. The source bin is provided with a source box assembly for placing the density radiation source. The upper surface of the source bin is provided with an emission window through which the gamma rays of the density radiation source are emitted towards the wellbore wall.

[0027] In one embodiment, the core assembly includes:

[0028] A push - against detector section thermos flask;

[0029] A detector assembly which is arranged at one end inside the push - against detector section thermos flask and is connected to the probe housing assembly. The detector assembly is provided with a spectrum - stabilizing source, a short - source - distance crystal, a long - source - distance crystal and a photomultiplier tube, and is used for receiving the reflected rays from the wellbore wall;

[0030] A push - against detector section in - flask circuit assembly which is connected to the detector assembly and is used for converting the reflected rays into the electrical signals;

[0031] A push - against detector section heat absorber which is connected to the push - against detector section in - flask circuit assembly and is used for absorbing the heat generated by the push - against detector section in - flask circuit assembly;

[0032] A push - against detector section heat insulation sleeve which is connected to the push - against detector section heat absorber and is used for isolating the heat from being transferred outside the push - against detector section thermos flask;

[0033] A push - against detector section connector assembly which is connected to the push - against detector section heat insulation sleeve.

[0034] In one embodiment, a plurality of blind holes are respectively formed on both sides of the probe housing. Each slip shoe assembly includes:

[0035] A sleeve which is sleeved on the end of the probe housing;

[0036] Inserts, of which there are two groups, each group containing a plurality of inserts. The two groups of inserts are oppositely arranged on both sides of the sleeve along the length direction of the sleeve, and through - holes in the form of fastening bolt holes are formed in the inserts;

[0037] Sliders, of which there are two. The two sliders are oppositely arranged at both ends of the upper surface of the sleeve along the width direction, and chutes are formed on the inner surfaces of the sliders;

[0038] Set screws which pass through the fastening bolt holes and are tightened in the blind holes, and are used for fixing the sleeve on the probe housing;

[0039] Among them, the blind holes and the fastening bolt holes are arranged in one-to-one correspondence.

[0040] In one embodiment, the electronic circuit section includes:

[0041] A pressure-resistant outer shell;

[0042] An electronic circuit section thermos bottle, which is arranged inside the pressure-resistant outer shell;

[0043] An in-bottle circuit component of the electronic circuit section, which is arranged inside the electronic circuit section thermos bottle and is connected to the push detector section. The in-bottle circuit component of the electronic circuit section is used to convert the logging data collected by the push detector section into an electrical signal;

[0044] An electronic circuit section heat absorber, which is connected to the in-bottle circuit component of the electronic circuit section. The electronic circuit section heat absorber is used to absorb the heat generated by the in-bottle circuit component of the electronic circuit section;

[0045] An electronic circuit section heat insulation sleeve, which is connected to the electronic circuit section heat absorber. The electronic circuit section heat insulation sleeve is used to isolate the heat from being transferred outside the electronic circuit section thermos bottle;

[0046] An out-of-bottle circuit component, which is arranged outside the electronic circuit section thermos bottle and is connected to the in-bottle circuit component of the electronic circuit section through a connection line. The out-of-bottle circuit component is used to send the electrical signal to a remote server.

[0047] In one embodiment, the electronic circuit section further includes:

[0048] An electronic circuit section plug and socket assembly, which is arranged at one end inside the pressure-resistant outer shell and is connected to the in-bottle circuit component of the electronic circuit section;

[0049] One end of the lower plug of the electronic circuit section along the length direction and is connected to the electronic circuit section plug and socket assembly;

[0050] An upper joint assembly of the electronic circuit section, which is arranged at the other end of the pressure-resistant outer shell and is connected to the out-of-bottle circuit component;

[0051] An upper protective cap of the electronic circuit section, which is arranged at the other end of the pressure-resistant outer shell along the length direction and is connected to the upper joint assembly of the electronic circuit section.

[0052] In one embodiment, the upper joint assembly of the push detector section is provided with an anti - tampering thread ring component and a thread ring component. The pressure - resistant housing of the electronic circuit section is provided with threads. The lower plug of the push detector section, the upper cap of the push detector section, the lower plug of the electronic circuit section, and the upper cap of the electronic circuit section are all detachable. The push detector section and the electronic circuit section can be connected through the anti - tampering thread ring component and the thread; the push detector section can also be connected to an external instrument through the thread ring component.

[0053] A litho - density logging tool of the present invention replaces the motor - driven retractable positioning device by arranging a spring plate assembly on the push detector section. When the spring plate assembly is compressed, it provides elastic force to make the push detector section close to the wellbore of the oil well to be measured, solving the problem that the motor - driven retractable positioning device of the litho - density logging tool in the prior art cannot be used for measurement in deep well conditions. Brief Description of the Drawings

[0054] The present invention will be described in more detail below based on embodiments and with reference to the drawings.

[0055] Figure 1 is a schematic structural diagram of a litho - density logging tool according to an embodiment of the present invention;

[0056] Figure 2 is a front view of a spring plate assembly according to an embodiment of the present invention;

[0057] Figure 3 is a top view of a spring plate assembly according to an embodiment of the present invention;

[0058] Figure 4 is a front view of a push detector section according to an embodiment of the present invention;

[0059] Figure 5 is a cross - sectional view of a push detector section according to an embodiment of the present invention;

[0060] Figure 6 is a rear view of a push detector section according to an embodiment of the present invention;

[0061] Figure 7 is a front view of a source box assembly according to an embodiment of the present invention;

[0062] Figure 8 is a top view of a source box assembly according to an embodiment of the present invention;

[0063] Figure 9 is a bottom view of a source box assembly according to an embodiment of the present invention;

[0064] Figure 10It is a cross-sectional view of a source cassette assembly that can be selected according to an embodiment of the present invention;

[0065] Figure 11 It is Figure 10 A schematic structural diagram of section A-A in

[0066] Figure 12 It is Figure 10 A schematic structural diagram of section B-B in

[0067] Figure 13 It is Figure 10 An enlarged view of part I in

[0068] Figure 14 It is a schematic structural diagram of a core component that can be selected according to an embodiment of the present invention;

[0069] Figure 15 It is a schematic structural diagram of a detector component that can be selected according to an embodiment of the present invention;

[0070] Figure 16 It is a front view of an inner circuit component of a push-to-detect detector joint bottle that can be selected according to an embodiment of the present invention;

[0071] Figure 17 It is a rear view of an inner circuit component of a push-to-detect detector joint bottle that can be selected according to an embodiment of the present invention;

[0072] Figure 18 It is a cross-sectional view of an inner circuit component of a push-to-detect detector joint bottle that can be selected according to an embodiment of the present invention;

[0073] Figure 19 It is a front view of a sliding shoe assembly that can be selected according to an embodiment of the present invention;

[0074] Figure 20 It is a top view of a sliding shoe assembly that can be selected according to an embodiment of the present invention;

[0075] Figure 21 It is a side view of a sliding shoe assembly that can be selected according to an embodiment of the present invention;

[0076] Figure 22 It is Figure 19 A schematic structural diagram of section A-A in

[0077] Figure 23 It is a cross-sectional view of an upper joint assembly of a push-to-detect detector joint that can be selected according to an embodiment of the present invention;

[0078] Figure 24 It is a schematic structural diagram of an upper joint assembly of a push-to-detect detector joint that can be selected according to an embodiment of the present invention;

[0079] Figure 25 It is a circuit diagram of a push-to-detect detector joint that can be selected according to an embodiment of the present invention;

[0080] Figure 26 is the front view of an electronic circuit section according to an embodiment of the present invention;

[0081] Figure 27 is the sectional view of an electronic circuit section according to an embodiment of the present invention;

[0082] Figure 28 is the front view of the in-bottle circuit components of an electronic circuit section according to an embodiment of the present invention;

[0083] Figure 29 is the top view of the in-bottle circuit components of an electronic circuit section according to an embodiment of the present invention;

[0084] Figure 30 is the bottom view of the in-bottle circuit components of an electronic circuit section according to an embodiment of the present invention;

[0085] Figure 31 is the front view of an out-of-bottle circuit component according to an embodiment of the present invention;

[0086] Figure 32 is the rear view of an out-of-bottle circuit component according to an embodiment of the present invention;

[0087] Figure 33 is the sectional view of an out-of-bottle circuit component according to an embodiment of the present invention;

[0088] Figure 34 is the side view of an out-of-bottle circuit component according to an embodiment of the present invention;

[0089] Figure 35 is the structural schematic diagram of the connecting sleeve Ⅲ of the plug and socket assembly of an electronic circuit section according to an embodiment of the present invention;

[0090] Figure 36 is the structural schematic diagram of the core socket Ⅱ of the plug and socket assembly of an electronic circuit section according to an embodiment of the present invention;

[0091] Figure 37 is the circuit diagram of an electronic circuit section according to an embodiment of the present invention.

[0092] Reference numerals:

[0093] 10. Pushing detector section; 11. Probe housing; 111. Abrasion-proof plate; 112. Beryllium window; 12. Probe housing assembly; 121. Source chamber; 122. Source screw; 13. Core assembly; 131. Thermos for pushing detector section; 1311. Detector assembly; 132. Inner-circuit assembly of pushing detector section; 133. Heat absorber of pushing detector section; 134. Heat-insulating sleeve of pushing detector section; 135. Connector assembly of pushing detector section; 14. Slide shoe assembly; 141. Sleeve; 142. Insert; 143. Slide block; 144. Set screw; 15. Plug and socket assembly of pushing detector section; 16. Lower plug of pushing detector section; 17. Upper joint assembly of pushing detector section; 18. Upper protective cap of pushing detector section; 20. Spring plate assembly; 21. Spring plate; 22. Hinge; 23. Pin; 24. Pin shaft; 25. Wear-resistant block assembly; 30. Electronic circuit section; 31. Pressure-resistant housing; 311. Thermos for electronic circuit section; 32. Inner-circuit assembly of electronic circuit section; 33. Heat absorber of electronic circuit section; 34. Heat-insulating sleeve of electronic circuit section; 35. Outer-circuit assembly; 36. Plug and socket assembly of electronic circuit section; 37. Lower plug of electronic circuit section; 38. Upper joint assembly of electronic circuit section; 39. Upper protective cap of electronic circuit section. Detailed implementation manners

[0094] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0095] As Figure 1As shown in the figure, the litho-density logging tool (hereinafter referred to as the logging tool) of the present invention includes a push-against detector section 10, a spring plate assembly 20, and an electronic circuit section 30. The push-against detector section 10 is used to collect logging data of the oil well to be measured; the spring plate assembly 20 is arranged on the push-against detector section 10, and the spring plate assembly 20 is used to provide elastic force when pressed to make the push-against detector section 10 close to the well wall of the oil well to be measured; the electronic circuit section 30 is connected to the push-against detector section 10, and the electronic circuit section 30 is used to convert the logging data collected by the push-against detector section 10 into electrical signals and send them to a remote server. The maximum outer diameter of the push-against detector section 10 is 95 mm, the pressure resistance is 206 MPa, and the temperature resistance is 260 °C / 6 hours; the spring plate assembly 20 adopts an eccentric bow slider structure, which can save the radial space to the greatest extent to ensure the pressure-bearing index of the logging tool and the shielding effect of the detector shielding body, and has the advantages of simple structure, safety and reliability, convenient maintenance, and small space occupation; the electronic circuit section 30 is connected to the SINOLOG900 downhole communication bus, the maximum outer diameter is 85 mm, the pressure resistance of the electronic circuit section is 206 MPa, and the temperature resistance is 260 °C / 6 hours. The litho-density logging can withstand a temperature of 260 °C, a pressure of 206 MPa, and the working time > 6 hours, solving the problem that the existing litho-density logging tool using a motor-driven retractable positioning device cannot be measured in deep well conditions.

[0096] During specific implementation, such as Figure 2 、 Figure 3As shown, the spring plate assembly 20 includes a spring plate 21, hinges 22, pins 23, pin shafts 24, and a wear-resistant block assembly 25. The spring plate 21 is bow-shaped. There are two hinges 22, and the two hinges 22 are respectively arranged inside the two ends of the spring plate 21 along the length direction. There are two pins 23, and the two pins 23 are respectively arranged at the ends of the two hinges 22. There are two pin shafts 24, and the two pin shafts 24 are respectively arranged in the two pins 23 along the thickness direction of the spring plate 21, and the two pin shafts 24 are respectively fixed at the two ends of the push detector section 10 along the length direction. The wear-resistant block assembly 25 is arranged in the middle of the spring plate 21. A roller and a wheel shaft are arranged on the upper surface of the wear-resistant block assembly 25, and the roller is used to reduce friction. The spring plate assembly 20 adopts an eccentric bow-shaped sliding shoe structure. The spring plate 21 is bow-shaped, and when the spring plate 21 is pressed from above, it will deform to generate elastic force. After the spring plate assembly 20 is installed on the push detector section 10 and the logging tool is lowered into the well, the elastic force of the spring plate 21 will give the logging tool a thrust, making the logging tool closely adhere to the well wall. To prevent the spring plate 21 from wearing, a wear-resistant block assembly 25 is installed in the middle of the spring plate 21. The rolling friction generated when the roller of the wear-resistant block assembly 25 rolls is smaller than the sliding friction, and the wear is also smaller. The wear-resistant block assembly 25 is fixed on the spring plate 21 with hexagon socket head cap screws M6x12. If the wear-resistant block assembly 25 wears, it can be replaced, thus avoiding the wear of the spring plate 21. The two ends of the spring plate 21 and the hinges 22 are fixed with rivets. There is a pin 23 at the end of the hinge 22, and the pin shaft 24 can be inserted into it. The pin 23 fixes the pin shaft 24 in the radial direction. The pin shaft 24 is inserted into the chute of the sliding shoe assembly 14. When the spring plate 21 is compressed, the pin shaft 24 slides in the chute; even if the spring plate 21 is flattened, no matter how the pin shaft 24 slides in the chute, it cannot slide out. When disassembling the spring plate assembly 20 from the sliding shoe assembly 14, first remove the 6 set screws 144 on the sliding shoe assembly 14, move the two sliding shoe assemblies 14 at both ends of the push detector section 10 towards the middle of the push detector section 10, then flatten the spring plate 21 to make the pin shaft 24 at one end of the spring plate assembly 20 slide out of the chute, and then make the pin shaft 24 at the other end of the spring plate 21 slide out of the chute.

[0097] During specific implementation, as Figures 4 to 6As shown in the figure, the pushing detector section 10 includes a probe housing 11, a probe housing assembly 12, a core assembly 13, and a slider shoe assembly 14. An abrasion-proof plate 111 and a beryllium window 112 are provided on the probe housing 11, and the beryllium window 112 is fixed to the probe housing 11 through a beryllium window cover plate. The probe housing assembly 12 is arranged inside the probe housing 11 and is used for installing a density radiation source and emitting gamma rays to the wellbore wall. The core assembly 13 is used for receiving the reflected rays from the wellbore wall and also for converting the reflected rays into electrical signals and transmitting them downward. There are two slider shoe assemblies 14, and the two slider shoe assemblies 14 are respectively arranged at both ends of the upper part of the probe housing 11 along the length direction, and chutes are respectively arranged on the two slider shoe assemblies 14; wherein, a spring plate assembly 20 is arranged in the chutes of the two slider shoe assemblies 14. The probe housing 11 is made of two-way precipitation hardening stainless steel 17-4PH, which has a very high tensile strength up to 900 MPa, and also has performance advantages such as anti-fatigue, corrosion resistance, and little deformation at high temperatures. Deep inner holes are opened at both the upper and lower ends of the probe housing 11, and the core assembly 13 can be inserted into the deep inner hole at the upper end, and the core socket I and the core plug are inserted into the deep inner hole at the lower end. An abrasion-proof plate 111 and an arc-shaped cover plate are installed on the detection surface of the probe housing 11. These parts are made of the same material as the probe housing 11 and are subjected to special surface hardening treatments such as nitriding, having very high hardness and wear resistance. They are connected to the probe housing 11 through high-strength stainless steel internal hexagon countersunk head screws M6x12. Their function is to prevent the detection surface of the probe housing 11 from being worn. If the wear is serious, new parts can be replaced, thus avoiding the wear of the probe housing 11 itself. The detection surface of the probe housing 11 is designed with a section of arc surface, and the radius of the arc surface can be 76 mm. A concave hole with a short source distance window is opened on the arc surface above the short source distance detector. This concave hole is a blind hole, and the short source distance window is made of polyimide material. This material has a small density, high hardness, high temperature and high pressure resistance, and high ray transmittance. The short source distance window is connected to the probe housing 11 with internal hexagon socket head cap screws M3x8. A beryllium window hole is opened on the arc surface above the long source distance detector, and the beryllium window 112 can be inserted into it. The beryllium window hole is a through hole and is communicated with the upper inner hole of the probe. In order to ensure the pressure-bearing and sealing effect, the beryllium window hole is designed as a tapered hole, and an O-ring seal is added between the beryllium window 112 and the beryllium window hole. The beryllium window 112 is a circular window made of beryllium metal. This metal material is 100% permeable to gamma rays and also has very high strength. Using it as a window has a very good effect on the detector receiving rays. The beryllium window cover plate is made of PEEK material. This material has good wear resistance, high temperature and high pressure resistance and other characteristics, and the beryllium window cover plate can be replaced after severe wear. Two groups of hook wrench holes are respectively opened on the cylindrical surfaces at both ends of the probe housing 11. Each group of hook wrench holes is 4 φ12 mm deep 3.5 mm evenly distributed holes, and their function is to facilitate the use of hook wrenches when disassembling and assembling the instrument.On the cylindrical surfaces at both ends of the probe housing 11, two groups of slider positioning holes are provided. Each group of slider positioning holes has 3 holes on one side, and a total of 6 symmetric φ12mm holes with a depth of 2.2mm on both sides. Their function is to position and fix the slider assembly 14. At the orifice of the deep inner holes at both ends of the probe housing 11, trapezoidal threads, sealing surfaces, and key grooves are designed for connecting other instruments.

[0098] Further, as Figure 23 , Figure 24 shown, the push detector section 10 further includes a push detector section plug and socket assembly 15, a push detector section lower plug 16, a push detector section upper joint assembly 17, and a push detector section upper cap 18. The push detector section plug and socket assembly 15 is arranged at one end inside the probe housing 11; the push detector section lower plug 16 is arranged at one end of the probe housing 11 along the length direction and is connected to the push detector section plug and socket assembly 15; the push detector section upper joint assembly 17 is arranged at the other end of the probe housing 11 along the length direction; the push detector section upper cap 18 is connected to the push detector section upper joint assembly 17. The push detector section upper joint assembly 17 is provided with an upper joint, an anti-disassembly thread ring component, a key, a thread ring component, an O-ring, a limit screw, and a retaining ring. The push detector section upper joint assembly 17 is made of 17-4PH material, and anti-disassembly thread ring components and thread ring components are respectively installed at both ends. Two annular grooves are respectively designed at the sealing surfaces at both ends, and O-rings can be installed. The hook wrench hole on the anti-disassembly thread ring component is designed as an irregular oblong hole, and a special hook wrench is required for disassembly, which can prevent damage to the core assembly 13 caused by the user's accidental disassembly. One end of the push detector section upper joint assembly 17 with a key is connected to the probe housing assembly 12. The key is inserted into the key groove of the probe housing 11, the anti-disassembly thread ring component enters the thread at the end of the probe housing 11, and the anti-disassembly thread ring is tightened to complete the connection between the push detector section upper joint assembly 17 and the probe housing assembly 12. The hexagon socket head cap screw M6x12 at one end of the push detector section upper joint assembly 17 is connected to the core assembly 13, and the limit screw at the other end limits the core socket in the push detector section connector assembly 135 in the core assembly 13. There is a key groove at this end of the upper joint, which is designed to be docked with the core plug of other instruments. The thread ring component at this end is connected to the upper cap or other instruments; the middle part of the upper joint is designed as an external hexagon structure, so that an open-end wrench can be used for disassembly and assembly.

[0099] During specific implementation, as Figures 7 to 13As shown, an embedding hole is provided on the upper surface of the probe housing 11. The probe housing assembly 12 includes a source bin 121 and a source screw 122. The source bin 121 is installed in the embedding hole. The source bin 121 is provided with a source box assembly for placing a density radiation source. An emission window is provided on the upper surface of the source bin 121 to enable the gamma rays of the density radiation source to be emitted towards the wellbore through the emission window. There are multiple source screws 122, and the multiple source screws 122 are used to fix the source box in the source bin 121. The source bin 121 is made of tungsten nickel iron material, which has a good effect of shielding rays. The rays emitted by the radiation source will only be emitted from the emission window of the source bin, and other directions are shielded. This design of the source bin 121 not only meets the usage requirements but also protects people from being irradiated by rays. An emission ray window is provided on the upper surface of the source bin 121, and a source hole is provided on one side surface, into which a 5700 source can be inserted. After the density radiation source is inserted into the source box assembly and the source box assembly is then inserted into the source bin 121, in order to ensure that the source box assembly does not separate from the source bin 121, the source box assembly is fixed with the source screw 122. In order to ensure that the source bin 121 will not fall out if the source screw 122 of the source bin 121 falls off, a second safety guarantee is designed. A roll pin with a diameter of φ6.35x90 is passed through the pin holes of the probe housing 11 and the source bin 121 to fix the source bin 121 in the probe housing 11. The source screw 122 is an internal hexagonal socket head cap screw M8x25 to lock the source bin 121 in the probe housing 11. A wire passing hole with a diameter of φ12 is provided on the lower surface of the source bin 121, and the wire passing hole communicates with the upper and lower inner holes to facilitate the penetration of the wire.

[0100] During specific implementation, such as Figures 14 to 18As shown in the figure, the core component 13 includes a push-against detector section thermos 131, a detector assembly 1311, a push-against detector section in-bottle circuit assembly 132, a push-against detector section heat absorber 133, a push-against detector section heat insulation sleeve 134, and a push-against detector section connector assembly 135. The detector assembly 1311 is disposed at one end inside the push-against detector section thermos 131 and is connected to the probe housing assembly 12. The detector assembly 1311 is provided with a stable spectrum source, a short source distance crystal, a long source distance crystal, and a photomultiplier tube. The detector assembly 1311 is used to receive the reflected rays from the wellbore wall. The push-against detector section in-bottle circuit assembly 132 is connected to the detector assembly 1311, and the push-against detector section in-bottle circuit assembly 132 is used to convert the reflected rays into electrical signals. The push-against detector section heat absorber 133 is connected to the push-against detector section in-bottle circuit assembly 132, and the push-against detector section heat absorber 133 is used to absorb the heat generated by the push-against detector section in-bottle circuit assembly 132. The push-against detector section heat insulation sleeve 134 is connected to the push-against detector section heat absorber 133, and the push-against detector section heat insulation sleeve 134 is used to isolate the heat from being transferred outside the push-against detector section thermos 131; the push-against detector section connector assembly 135 is connected to the push-against detector section heat insulation sleeve 134. The various components of the core component 13 are connected and assembled by cross-recessed countersunk screws M4x8. The detector assembly 1311 is at the end, followed by the push-against detector section in-bottle circuit assembly 132, the push-against detector section heat absorber 133, the push-against detector section heat insulation sleeve 134, and the push-against detector section connector assembly 135. On the skeleton plate of the push-against detector section in-bottle circuit assembly 132, there are a preamplifier board, a high-voltage filter board, and two high-voltage blocks. The circuit board and the high-voltage blocks are respectively fixed on the circuit skeleton with screws, and the various circuit boards are connected by connecting wires. The push-against detector section in-bottle circuit assembly 132 is connected to the photomultiplier tube in the detector assembly 1311 by a connecting wire. There are holes or screw holes at both ends of the skeleton plate, which are respectively connected to the push-against detector section heat absorber 133 and the detector assembly 1311. One end of the push-against detector section connector assembly 135 is connected to both the push-against detector section heat insulation sleeve 134 and the push-against detector section thermos 131. The push-against detector section thermos 131 is sleeved over the above components and connected to the push-against detector section connector assembly 135. The push-against detector section thermos 131 is designed with a middle vacuum structure, which has a good heat insulation effect, and the high temperature outside will not affect the components of the push-against detector section in-bottle circuit assembly 132. The push-against detector section heat absorber 133 is designed according to the power consumption of the push-against detector section in-bottle circuit assembly 132 and can absorb the heat generated by the heat of the push-against detector section in-bottle circuit assembly 132. The function of the push-against detector section heat insulation sleeve 134 is to isolate the heat from being transferred from outside the bottle to inside the bottle. The push-against detector section connector assembly 135 is provided with a connector, a transition sleeve I, a connecting sleeve I, and a core socket I. On one end of the connecting sleeve I, long round holes are opened on both sides. On one end of the transition sleeve I connected, a round hole is opened. A cylindrical pin φ3x8 passes through these holes, so that the transition sleeve I and the connecting sleeve I can slide relative to each other.The compression spring is installed on the adapter sleeve I, and the core socket I is installed at the end of the connecting sleeve I. When the core plug is connected to the core socket I, the core plug pushes the core socket I to move backward, and the spring is compressed, playing a role in shock absorption and buffering. Three long round holes are opened on the cylindrical surface at one end of the adapter sleeve I where it is connected to the connector. Three socket head cap screws M3x5 are installed in these long round holes to provide axial limit for the adapter sleeve I, and it can rotate at a small angle radially. This can be adjusted to align the keyway of the core socket I with the limit screw of the upper joint assembly to limit the core socket I. The detector assembly 1311 is installed in the probe housing 11 through the centering end and the shielding sponge pad. One end of the centering end connected to the push detector section thermos flask 131 is designed as an eccentric structure, which can lift the push detector section thermos flask 131 a little bit, leaving a wiring space at the lower part of the push detector section thermos flask 131. The function of the shielding sponge pad is to shock-absorb the core assembly 13 to protect the core assembly 13 when the core assembly 13 is installed in the probe housing 11. The detector assembly 1311 consists of two NaI scintillation crystals, two photomultiplier tubes, long and short source distance sleeves, and two spectrum stabilizing sources. The long source distance sleeve and the short source distance sleeve are connected to the connecting sleeve II with cross recessed countersunk head screws M2.5x6; the spectrum stabilizing source chamber is threadedly connected to the long source distance sleeve and the short source distance sleeve; the spectrum stabilizing source is installed in the spectrum stabilizing source chamber, and the long source distance crystal and the short source distance crystal are respectively installed in the long source distance sleeve and the short source distance sleeve. At the positions of the long and short source distance crystals, it is used to monitor the stability (spectrum stabilization) of the long source distance probe. A photomultiplier tube is installed between the crystal and the connecting sleeve II, and compression springs are installed at both ends of the connecting sleeve II. The function is to make the photomultiplier tube close to the crystal. Finally, the long source distance sleeve, the connecting sleeve II, and the short source distance sleeve are installed in the shielding body. The shielding body is made of tungsten-nickel-iron material. Square holes are opened above the long and short source distance crystals of the shielding body, and the rays can enter the crystals from these two square holes, while other places shield the rays. In this way, the detector can only receive rays in the specified direction.

[0101] During specific implementation, such as Figures 19 to 22As shown, a plurality of blind holes are respectively provided on both sides of the probe housing 11. Each slider assembly 14 includes a sleeve 141, an insert 142, a slider 143 and a set screw 144. The sleeve 141 is sleeved on the end of the probe housing 11; there are two groups of inserts 142, each group containing a plurality of inserts 142, and the two groups of inserts 142 are oppositely arranged on both sides of the sleeve 141 along the length direction of the sleeve 141, and fastening bolt holes in the form of through holes are provided in the inserts 142; there are two sliders 143, and the two sliders 143 are oppositely arranged at both ends of the upper surface of the sleeve 141 along the width direction, and a chute is formed on the inner surface of the slider 143; the set screw 144 passes through the fastening bolt hole and is tightened in the blind hole, and the set screw 144 is used to fix the sleeve 141 on the probe housing 11; wherein, the blind holes and the fastening bolt holes are arranged in one-to-one correspondence; the fastening bolt hole in the middle of the insert 142 is a threaded hole, and the set screw 144 has a thread and can be inserted into the insert, and the set screw is tightened so that the end face of the set screw 144 abuts against the bottom surface of the slider fixing hole of the probe housing 11, so that the slider assembly 14 can be fixed on the probe housing. The two slider assemblies 14 are respectively installed at both ends of the probe housing 11, and the chute formed between the left and right sliders 143 allows the pin shafts 24 at both ends of the spring plate assembly 20 to slide back and forth therein.

[0102] During specific implementation, as Figures 26 to 34As shown, the electronic circuit node 30 includes a pressure-resistant shell 31, an electronic circuit node thermos bottle 311, an electronic circuit node bottle internal circuit component 32, an electronic circuit node heat absorber 33, an electronic circuit node heat insulation sleeve 34 and a bottle external circuit component 35. The electronic circuit node thermos bottle 311 is arranged in the pressure-resistant shell 31; the electronic circuit node bottle internal circuit component 32 is arranged in the electronic circuit node thermos bottle 311 and is connected to the push-against detector node 10, and the electronic circuit node bottle internal circuit component 32 is used to convert the logging data collected by the push-against detector node 10 into an electrical signal; the electronic circuit node heat absorber 33 is connected to the electronic circuit node bottle internal circuit component 32, and the electronic circuit node heat absorber 33 is used to absorb the heat generated by the electronic circuit node bottle internal circuit component 32; the electronic circuit node heat insulation sleeve 34 is connected to the electronic circuit node heat absorber 33, and the electronic circuit node heat insulation sleeve 34 is used to isolate the heat from being transferred to the outside of the electronic circuit node thermos bottle 311; the bottle external circuit component 35 is arranged outside the electronic circuit node thermos bottle 311 and is connected to the electronic circuit node bottle internal circuit component 32 through a connecting line, and the bottle external circuit component 35 is used to send the electrical signal to a remote server. There is a hook wrench hole at the lower end of the pressure-resistant shell 31, and a hook wrench can be used to disassemble and assemble the instrument. There are keyways at both ends of the outer cylindrical surface of the pressure-resistant shell 31. When installing the joint assembly or other instruments, the keyways can be used to align the instrument or assembly. The pressure-resistant shell 31 is designed after pressure calculation and can withstand a pressure of 206MPa. The circuit assembly 32 in the electronic circuit node bottle is provided with a power module, an SL communication board, a storage board, a density digital board, a power board, a density signal processing board and a DC-DC module. The circuit board and the DC-DC module are fixed to the skeleton with screws respectively, and the circuit boards are connected by connecting wires. There is a hole at one end of the skeleton board, which is connected to the electronic circuit node heat absorber 33. The external circuit component 35 is provided with an external circuit skeleton, an adapter plate, a core rectangular socket female head, a core rectangular socket male head, an adapter sleeve II and a core socket II. One end of the external circuit skeleton is connected with the adapter sleeve II, the connecting sleeve IV and the core socket II. Long circular holes are opened on both sides of one end of the connecting sleeve IV, and a round hole is opened at the connected end of the adapter sleeve II. A cylindrical pin φ3x8 passes through these holes so that the adapter sleeve II and the connecting sleeve IV can slide relative to each other. A compression spring is arranged on the adapter sleeve II, and the core socket II is installed at the end of the connecting sleeve IV. When the core plug is connected to the core socket II, the plug pushes the core socket II to move backward, and the spring is compressed, which plays a role of shock absorption and buffering. There are three oblong holes on the cylindrical surface of one end of the adapter sleeve II that is connected to the circuit frame outside the bottle. Three hexagon socket head screws M3x5 are installed in these oblong holes to limit the axial position of the adapter sleeve II. It can rotate radially at a small angle, so that the keyway of the core socket II can be adjusted to align with the limit screw of the connector assembly 38 on the electronic circuit node, so as to limit the axial rotation of the core socket II.

[0103] Furthermore, if Figure 26 、 Figure 27 、 Figure 35 and Figure 36As shown in the figure, the electronic circuit section 30 further includes an electronic circuit section plug and socket assembly 36, an electronic circuit section lower plug 37, an electronic circuit section upper joint assembly 38, and an electronic circuit section upper protective cap 39. The electronic circuit section plug and socket assembly 36 is arranged at one end inside the pressure-resistant housing 31 and is connected to the electronic circuit section inner-bottle circuit assembly 32; the electronic circuit section lower plug 37 is arranged at one end of the pressure-resistant housing 31 along the length direction and is connected to the electronic circuit section plug and socket assembly 36; the electronic circuit section upper joint assembly 38 is arranged at the other end of the pressure-resistant housing 31 and is connected to the outer-bottle circuit assembly 35; the electronic circuit section upper protective cap 39 is arranged at the other end of the pressure-resistant housing 31 along the length direction and is connected to the electronic circuit section upper joint assembly 38. The electronic circuit section plug and socket assembly 36 is provided with a connecting sleeve III and a core socket II. The thermos flask 311 of the electronic circuit section, the electronic circuit section inner-bottle circuit assembly 32, the electronic circuit section heat absorber 33, the electronic circuit section heat insulation sleeve 34, and the outer-bottle circuit assembly 35 of the electronic circuit section 30 form the electronic circuit section core sub-assembly. There is a keyway at the lower end of the pressure-resistant housing 31, and the connecting sleeve III is provided with a key, and the key is inserted into the keyway of the pressure-resistant housing 31 to limit the axial rotation of the electronic circuit section core sub-assembly. Both ends of the core plug II have keys and are inserted into the housing keyway through the keys from the lower end of the pressure-resistant housing 31. After being inserted, the pins are inserted into the jacks. There is a hole in the middle of the pressure-resistant housing 31, and there are connecting threads at both ends. Behind the threads are sealing surfaces. The sealing surface of the electronic circuit section upper joint assembly 38 cooperates with the sealing surface of the pressure-resistant housing 31. The electronic circuit section upper joint assembly 38 is similar to the upper joint assembly 17 of the push detector section. Anti-disassembly thread ring parts and thread ring parts are respectively installed at both ends, and two annular grooves are respectively designed at the sealing surfaces at both ends, and O-ring seals can be installed, so that it can withstand a pressure of 206 MPa or even greater. The electronic circuit section upper joint assembly 38 is not connected to the electronic circuit section core sub-assembly. The elastic force of the compression spring of the outer-bottle circuit assembly 35 makes the end face of the outer-bottle circuit skeleton press against the core sub-assembly, so that the electronic circuit section core sub-assembly does not shake back and forth. This is because the parts in the electronic circuit section core sub-assembly do not require accurate position accuracy. The electronic circuit section upper joint assembly 38 is installed at the upper end of the housing. When the electronic circuit section 30 is not connected, the electronic circuit section upper protective cap 39 and the electronic circuit section lower plug 37 are respectively installed at the upper and lower ends of the electronic circuit section 30 to play a role in protecting the electronic circuit section 30.

[0104] During specific implementation, the upper joint assembly 17 of the push detector section is provided with anti-disassembly thread ring parts and thread ring parts. The pressure-resistant housing 31 of the electronic circuit section is provided with threads. The lower plug 16 of the push detector section, the upper protective cap 18 of the push detector section, the lower plug 37 of the electronic circuit section, and the upper protective cap 39 of the electronic circuit section are all detachable. The push detector section 10 and the electronic circuit section 30 can be connected through the anti-disassembly thread ring parts and threads; the push detector section 10 can also be connected to an external instrument through the thread ring parts.

[0105] When a litho-density logging tool according to an embodiment of the present invention is specifically used, as Figure 25 and Figure 37 shown, first install the spring plate assembly 20 on the push detector section 10, and then connect the push detector section 10 and the electronic circuit section 30 by threads. The electronic circuit section 30 is on top and the push detector section 10 is at the bottom. Lower them into the wellbore with a cable. When reaching the bottom of the well, lift the push detector section 10 at a suitable speed and uniformly. At this time, the elastic force of the spring plate 21 of the spring plate assembly 20 makes the detection surface of the logging tool closely adhere to the wellbore wall, and the logging starts. The source bin 121 containing the radiation source continuously emits gamma rays to irradiate the surrounding wellbore. A part of the photons are scattered by the formation and then absorbed by the formation, and some of the scattered photons that are not absorbed enter the long source distance crystal and the short source distance crystal, and react with the crystal to generate counts; in order to prevent the gamma photons emitted by the γ source in the source bin 121 from directly hitting the detector assembly 1311, they are separated by a shielding material, which is also the reason why the wear-resistant plate 111 needs to use a tungsten alloy with high shielding performance. At the same time, in order to further reduce the influence of the wellbore, a shielding material is also added to the side of the push detector section 10 facing away from the formation. The push detector section 10 uses two detectors with long and short source distances. The short source distance detector is closer to the γ source, and the long source distance detector is farther from the γ source. Gamma photons have different scattering and absorption capabilities in formations with different densities. Therefore, the gamma photon counts recorded by the push detector section 10 are also different. The formation gamma rays after Compton scattering enter the long and short source distance windows; when captured by the crystal, a discrete flash is generated; those photons become electrical pulses in the photomultiplier tube, and the electrical pulses are amplified by a series of dynode stages. These signals are sent to the short source distance and long source distance input ends of the preamplifier circuit board; the inner circuit assembly 32 in the electronic circuit section bottle consists of a preamplifier board, a high-voltage filter board, and two high-voltage power modules. The high voltage output by the high-voltage module is filtered by two π-type filter circuits of the high-voltage filter board and then provides high voltage to the photomultiplier tubes of the long and short source distances; the pulse signals output by the long and short source distance photomultiplier tubes are respectively output to the analog circuit of the out-of-bottle circuit assembly 35 after increasing the driving ability through two-way two-stage reverse amplifier circuits. The computer on the ground is connected to the logging tool through a cable, and the P e is solved through a dedicated software and algorithm. Gamma photons mainly generate photoelectric effect and Compton effect with the formation, and the Compton effect is dominant. At this time, the absorption coefficient of the formation for gamma photons can be expressed as where σ m =σ / ρ b is the mass Compton attenuation coefficient. Define the average photoelectric absorption cross section of an electron in the rock as the rock photoelectric absorption index, which is represented by P e , that is Then the photoelectric absorption index of minerals or fluids composed of a single compound is

[0106] The following table shows the P values ​​of common minerals and fluids in petroleum logging. e value, you can find the fluid's P e Value than mineral P e The value is much smaller, which shows that the measured rock photoelectric absorption index is little affected by the properties and content of the fluid in the rock, and mainly depends on the rock mineral composition and its content. Therefore, it can be measured by measuring the rock P e Values ​​are used to identify lithology.

[0107] Pe values ​​for common minerals and fluids

[0108]

[0109] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. 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 lithology density logging tool, characterized in that: include: A push detector section (10) is used to collect well logging data of the oil well to be tested; A spring plate assembly (20) is arranged on the push-to-detector section (10), and the spring plate assembly (20) is used to provide elastic force when under pressure to make the push-to-detector section (10) close to the well wall of the oil well to be detected; An electronic circuit node (30) is connected to the push-to-detector node (10), and the electronic circuit node (30) is used to convert the logging data collected by the push-to-detector node (10) into an electrical signal and send it to a remote server.

2. The lithology density logging tool according to claim 1, characterized in that: The spring plate assembly (20) comprises a spring plate (21) which is in an arcuate shape; two ends of the spring plate (21) are respectively mounted on two ends of the pushing detector section (10) along the length direction.

3. The lithology density logging tool according to claim 2, characterized in that: The spring plate assembly (20) further comprises: Two hinges (22) are provided, and the two hinges (22) are respectively provided at two ends of the spring plate (21) along the length direction; Two pins (23) are provided, and the two pins (23) are respectively provided at the ends of the two hinges (22); Two pin shafts (24) are provided. The two pin shafts (24) are respectively inserted into the two pins (23) along the thickness direction of the spring plate (21) and fixed at two ends of the push detector section (10) along the length direction.

4. The lithology density logging tool according to claim 2 or 3, characterized in that: The spring plate assembly (20) further comprises a wear-resistant block assembly (25), wherein the wear-resistant block assembly (25) is arranged in the middle of the spring plate (21), and a roller and a wheel axle are arranged on the upper surface of the wear-resistant block assembly (25), wherein the roller is used to reduce friction.

5. The lithology density logging tool according to claim 1, characterized in that: The pushing detector section (10) comprises: A probe housing (11) on which a wear plate (111) and a beryllium window (112) are provided, wherein the beryllium window (112) is fixed to the probe housing (11) via a beryllium window cover; A probe housing component (12), which is arranged in the probe housing (11), and the probe housing component (12) is used to install a density radiation source and emit gamma rays to the well wall; A core assembly (13) for receiving reflected rays from the well wall and converting the reflected rays into the electrical signal and transmitting the electrical signal; Two sliding shoe assemblies (14) are provided, and the two sliding shoe assemblies (14) are respectively arranged at two ends along the length direction above the probe housing (11), and the two sliding shoe assemblies (14) are provided with sliding grooves; Wherein, the spring plate assembly (20) is arranged in the sliding grooves of the two sliding shoe assemblies (14).

6. The lithology density logging tool according to claim 5, characterized in that: The pushing detector section (10) further comprises: A probe node plug and socket assembly (15) is pushed against the probe node and is disposed at one end of the probe housing (11); A plug (16) under the push-on detector section, which is arranged at one end of the probe housing (11) along the length direction and is connected to the push-on detector section plug and socket assembly (15); A push-on probe joint joint assembly (17) is arranged at the other end of the probe housing (11) along the length direction; A protective cap (18) on the push-on detector section is connected to the joint assembly (17) on the push-on detector section.

7. The lithology density logging tool according to claim 5, characterized in that: An embedding hole is provided on the upper surface of the probe housing (11); the probe housing assembly (12) comprises a source compartment (121); the source compartment (121) is installed in the embedding hole; a source box assembly is provided in the source compartment (121); the source box assembly is used to place the density radiation source; an emission window is provided on the upper surface of the source compartment (121) so that gamma rays from the density radiation source are emitted toward the well wall through the emission window.

8. The lithology density logging tool according to claim 5, characterized in that: The core assembly (13) comprises: Push the thermos bottle (131) against the detector; A detector assembly (1311), which is arranged at one end of the push-to-detector thermos bottle (131) and connected to the probe housing assembly (12), wherein the detector assembly (1311) is provided with a spectrum stabilizing source, a short source distance crystal, a long source distance crystal and a photomultiplier tube, and is used to receive reflected rays from the well wall; A push detector bottle internal circuit component (132), which is connected to the detector component (1311), and the push detector bottle internal circuit component (132) is used to convert the reflected rays into the electrical signal; A push-to-detector node heat absorber (133), which is connected to the circuit assembly (132) in the push-to-detector node bottle, and the push-to-detector node heat absorber (133) is used to absorb the heat generated by the circuit assembly (132) in the push-to-detector node bottle; A push-to-detector section heat-insulating sleeve (134), which is connected to the push-to-detector section heat-absorbing body (133), and the push-to-detector section heat-insulating sleeve (134) is used to isolate the heat from being transferred to the outside of the push-to-detector section thermos bottle (131); A push-on detector section connector assembly (135) is connected to the push-on detector section heat insulating sleeve (134).

9. The lithology density logging tool according to claim 5, characterized in that: A plurality of blind holes are respectively arranged on both sides of the probe housing (11), and each of the sliding shoe components (14) comprises: A sleeve (141) sleeved on the end of the probe housing (11); Inserts (142), which are provided in two groups, each group comprising a plurality of inserts (142), the two groups of inserts (142) being relatively arranged on both sides of the sleeve (141) along the length direction of the sleeve (141), and the inserts (142) are provided with fastening bolt holes in the form of through holes; Two sliders (143) are provided, and the two sliders (143) are arranged oppositely at two ends of the upper surface of the sleeve (141) along the width direction, and the inner surface of the slider (143) is provided with a sliding groove; a set screw (144) passing through the fastening bolt hole and being screwed into the blind hole, the set screw (144) being used to fix the sleeve (141) on the probe housing (11); Wherein, the blind holes and the fastening bolt holes are arranged in one-to-one correspondence.

10. The lithology density logging tool according to claim 6, characterized in that: The electronic circuit section (30) comprises: A pressure-resistant casing (31); An electronic circuit-section thermos bottle (311), which is arranged in the pressure-resistant housing (31); An electronic circuit node bottle internal circuit component (32), which is arranged in the electronic circuit node thermos bottle (311) and connected to the push-to-detector node (10), and the electronic circuit node bottle internal circuit component (32) is used to convert the well logging data collected by the push-to-detector node (10) into an electrical signal; An electronic circuit node heat absorber (33) connected to the circuit component (32) in the electronic circuit node bottle, the electronic circuit node heat absorber (33) being used to absorb heat generated by the circuit component (32) in the electronic circuit node bottle; An electronic circuit node heat-insulating sleeve (34), which is connected to the electronic circuit node heat absorber (33), and the electronic circuit node heat-insulating sleeve (34) is used to isolate the heat from being transferred to the outside of the electronic circuit node thermos bottle (311); The external circuit component (35) is arranged outside the electronic circuit node thermos bottle (311) and is connected to the internal circuit component (32) of the electronic circuit node via a connecting line. The external circuit component (35) is used to send the electrical signal to a remote server.

11. The lithology density logging tool according to claim 10, characterized in that: The electronic circuit section (30) further comprises: An electronic circuit node plug and socket assembly (36), which is arranged at one end of the pressure-resistant housing (31) and connected to the circuit assembly (32) in the electronic circuit node bottle; The lower plug (37) of the electronic circuit node is arranged at one end of the pressure-resistant shell (31) along the length direction and is connected to the plug and socket assembly (36) of the electronic circuit node; An electronic circuit joint connector assembly (38), which is arranged at the other end of the pressure-resistant shell (31) and connected to the external circuit component (35); The electronic circuit section upper protective cap (39) is arranged at the other end of the pressure-resistant housing (31) along the length direction and is connected to the electronic circuit section upper connector assembly (38).

12. The lithology density logging tool according to claim 11, characterized in that: The push-on detector joint upper joint assembly (17) is provided with an anti-disassembly threaded ring component and a threaded ring component, the pressure-resistant shell (31) of the electronic circuit joint is provided with a thread, the push-on detector joint lower plug (16), the push-on detector joint upper protective cap (18), the electronic circuit joint lower plug (37) and the electronic circuit joint upper protective cap (39) are all detachable, the push-on detector joint (10) and the electronic circuit joint (30) can be connected via the anti-disassembly threaded ring component and the thread; the push-on detector joint (10) can also be connected to an external instrument via the threaded ring component.

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