Logging while drilling distal gamma measurement device

Abstract

This utility model discloses a remote gamma measurement device for logging while drilling. The remote gamma measurement device includes: a pressure-resistant cylinder, a mounting frame, a main control and power board, a gamma sensor, a shielding layer, a heat-conducting component, a first connector assembly, and a second connector assembly. The mounting frame is located inside the pressure-resistant cylinder; the main control and power board is located on the mounting frame; the gamma sensor is located on the mounting frame and electrically connected to the main control and power board; the shielding layer is located inside the pressure-resistant cylinder and is used to shield the peripheral area of ​​the gamma sensor; the heat-conducting component is configured to conduct heat from the gamma sensor to the mounting frame; the first connector assembly is located on the pressure-resistant cylinder and electrically connected to the main control and power board; the second connector assembly is located on the pressure-resistant cylinder and electrically connected to the gamma sensor. This utility model's remote gamma measurement device for logging while drilling can improve the thermal conductivity and heat dissipation capabilities of NaI crystals, further improving the reliability of the remote gamma measurement device for logging while drilling.

Description

Technical Field

[0001] This utility model relates to the field of downhole exploration technology, and in particular to a remote gamma measurement device for logging while drilling. Background Technology

[0002] When the remote gamma measurement device for logging while drilling is operating, gamma rays enter the NaI(Tl) crystal and generate secondary electrons through the photoelectric effect and Compton scattering. These charged particles excite the thallium (Tl) activation centers in the crystal, which emit fluorescent photons with a wavelength of 415 nm upon de-excitation. During the energy conversion process, some energy is converted into lattice vibrations (thermal energy) in a non-radiative form, leading to a temperature rise. The gamma sensor's measurement values ​​exhibit different response levels under different temperature conditions. Therefore, if the temperature generated by the gamma sensor's operation and its influence on the detection results are not considered, the accuracy of the measurement results will fluctuate.

[0003] Furthermore, excessively high temperatures can cause irreversible performance degradation in NaI crystals. To measure azimuth gamma values, remote gamma measurement devices used in logging-while-drilling typically employ shielding materials to block gamma rays. These shielding materials are usually tungsten-nickel-iron alloys, but their poor thermal conductivity further exacerbates the heat generated during operation and the high-temperature damage to NaI crystals. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of this invention is to provide a remote gamma ray measurement device for logging while drilling, which can improve the thermal conductivity and heat dissipation capabilities of NaI crystals, further enhancing the reliability of the remote gamma ray measurement device for logging while drilling.

[0005] A remote gamma measurement device for logging while drilling according to an embodiment of the present invention includes: a pressure-resistant cylinder, a mounting frame, a main control and power board, a gamma sensor, a shielding layer, a heat-conducting component, a first connector assembly, and a second connector assembly. The mounting frame is disposed within the pressure-resistant cylinder; the main control and power board is disposed on the mounting frame; the gamma sensor is disposed on the mounting frame and electrically connected to the main control and power board; the shielding layer is disposed within the pressure-resistant cylinder to shield a portion of the peripheral area of ​​the gamma sensor; the heat-conducting component is configured to conduct heat from the gamma sensor to the mounting frame; the first connector assembly is disposed on the pressure-resistant cylinder and electrically connected to the main control and power board; the second connector assembly is disposed on the pressure-resistant cylinder and electrically connected to the gamma sensor.

[0006] According to the remote gamma measurement device for logging while drilling according to the present invention, the heat-conducting component can conduct the heat of the gamma sensor to the mounting frame, thereby reducing the temperature of the gamma sensor and preventing the measurement results of the remote gamma measurement device for logging while drilling from being affected by the excessive temperature of the gamma sensor, thus improving the reliability of the remote gamma measurement device for logging while drilling.

[0007] In some embodiments of this utility model, the heat-conducting component is cylindrical, and the gamma sensor is sleeved inside the heat-conducting component.

[0008] In some embodiments of this utility model, the gamma sensor includes a photomultiplier tube and a NaI crystal. The photomultiplier tube is disposed on the side of the NaI crystal near the main control and power board, and the heat-conducting component at least covers the side and end face of the NaI crystal.

[0009] In some embodiments of this utility model, the mounting frame is provided with a mounting groove, the heat-conducting component and the gamma sensor are disposed in the mounting groove, the peripheral side of the heat-conducting component is in contact with the mounting groove, and at least one end of the heat-conducting component in the axial direction is in contact with the mounting groove.

[0010] In some embodiments of this utility model, the heat-conducting component includes a first cylindrical portion and a second cylindrical portion, the first cylindrical portion and the second cylindrical portion are arranged and connected along the axial direction of the pressure-resistant cylinder, the ends of the first cylindrical portion and the second cylindrical portion away from each other are both closed ends, and the first cylindrical portion is closer to the main control and power board than the second cylindrical portion.

[0011] In some embodiments of this utility model, the gamma sensor includes a photomultiplier tube and a NaI crystal. The photomultiplier tube is disposed on the side of the NaI crystal near the main control and power board. A docking position is provided between the first cylindrical part and the second cylindrical part. The docking position is located between the two end faces of the photomultiplier tube in the axial direction of the pressure-resistant cylinder.

[0012] In some embodiments of this utility model, the remote gamma measurement device for logging while drilling includes a temperature detection element disposed inside the heat-conducting element, and a docking position is provided between the first cylinder and the second cylinder, the docking position being located between the two end faces of the temperature detection element in the axial direction of the pressure-resistant cylinder.

[0013] In some embodiments of this utility model, the remote gamma measurement device for logging while drilling includes a metal shielding sleeve, the metal shielding sleeve is fitted inside the heat-conducting component, and the photomultiplier tube is disposed inside the metal shielding sleeve.

[0014] In some embodiments of this utility model, the mounting frame is an integrally molded part, and the mounting frame is provided with a mounting groove, a first recessed groove and a second recessed groove. The first recessed groove and the second recessed groove are located on the side of the mounting groove away from the second connector assembly, and the first recessed groove and the second recessed groove are located on opposite sides of the mounting frame. The heat-conducting component and the gamma sensor are located in the mounting groove, and the main control and power board includes a main control circuit board and a power circuit board. The main control circuit board is located in the first recessed groove, and the power circuit board is located in the second recessed groove.

[0015] In some embodiments of this utility model, the second connector assembly includes a second fixed shaft, a second connector, and a disc spring. A portion of the second fixed shaft is sleeved on the mounting frame and inner sleeved on the pressure-resistant cylinder. The second connector is sleeved on the second fixed shaft, and a portion of the second connector is inner sleeved on the pressure-resistant cylinder. There are at least two disc springs, which are disposed between the second fixed shaft and the second connector.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0018] Figure 1 A three-dimensional structural schematic diagram of the remote gamma measurement device for logging while drilling provided in some embodiments of this utility model;

[0019] Figure 2 A front view of a portion of the structure of a remote gamma measurement device for logging while drilling provided in some embodiments of this utility model;

[0020] Figure 3 Exploded structural diagrams of a portion of the remote gamma measurement device for logging while drilling provided in some embodiments of this utility model;

[0021] Figure 4 A top view of a portion of the structure of a remote gamma measurement device for logging while drilling provided in some embodiments of this utility model;

[0022] Figure 5 A cross-sectional view of a portion of the structure of a remote gamma measurement device for logging while drilling provided in some embodiments of this utility model;

[0023] Figure 6 for Figure 5 A magnified view of a portion of point I;

[0024] Figure 7 for Figure 5 Enlarged view of section II;

[0025] Figure 8 for Figure 2 A sectional view;

[0026] Figure 9 for Figure 2 Enlarged view of section III;

[0027] Figure 10 A cross-sectional view of a first connector provided for some embodiments of the present invention.

[0028] Figure label:

[0029] 100. Remote gamma measurement device for logging while drilling;

[0030] 10. Compression cylinder;

[0031] 20. Mounting frame; 20a. Mounting groove; 20b. First recessed groove; 20c. Second recessed groove; 20d. First wiring hole; 20e. Second wiring hole; 20f. Third wiring hole; 21. Pressure cap; 21a. Groove; 22. Wiring; 23. Top rod; 24. Compression nut; 25. Metal washer; 26. O-ring seal;

[0032] 30. Main control and power supply board; 31. Main control circuit board; 32. Power supply circuit board;

[0033] 40. Gamma sensor; 41. Photomultiplier tube; 42. NaI crystal;

[0034] 50. Shielding layer;

[0035] 60. Metal shielding sleeve; 60a. Second through hole; 61. First part; 62. Second part; 63. Transition part; 63a. Inner surface; 63b. Straight section; 63c. Sloping section; 64. First step;

[0036] 70. Heat-conducting component; 71. First cylindrical section; 71a. First through hole; 72. Second cylindrical section; 73. Butt joint position;

[0037] 80. First connector assembly; 81. First fixed shaft; 811. Flat key; 812. Single-core connector; 813. Grounding spring; 82. First connector; 82a. Keyway;

[0038] 90. Second connector assembly; 91. Second fixed shaft; 92. Second connector; 93. Disc spring;

[0039] 110. Temperature detection components. Detailed Implementation

[0040] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0041] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0042] Furthermore, features specified as "first" or "second" may explicitly or implicitly include one or more of the same feature, used to distinguish and describe features, without any order or distinction of importance.

[0043] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0044] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0045] The following is for reference. Figures 1-8 This describes the remote gamma measurement device 100 for logging while drilling, according to an embodiment of the present invention.

[0046] like Figures 1 to 5As shown, the remote gamma measurement device 100 for logging while drilling according to this utility model includes: a pressure-resistant cylinder 10, a mounting frame 20, a main control and power board 30, a gamma sensor 40, a shielding layer 50, a heat-conducting component 70, a first connector assembly 80, and a second connector assembly 90. The mounting frame 20 is disposed inside the pressure-resistant cylinder 10; the main control and power board 30 is disposed on the mounting frame 20; the gamma sensor 40 is disposed on the mounting frame 20 and electrically connected to the main control and power board 30; the shielding layer 50 is disposed inside the pressure-resistant cylinder 10 to shield the peripheral area of ​​the gamma sensor 40; the heat-conducting component 70 is configured to conduct heat from the gamma sensor 40 to the mounting frame 20; the first connector assembly 80 is disposed on the pressure-resistant cylinder 10 and electrically connected to the main control and power board 30; the second connector assembly 90 is disposed on the pressure-resistant cylinder 10 and electrically connected to the gamma sensor 40.

[0047] The pressure-resistant cylinder 10 can refer to a component that is installed around the mounting frame 20. It can be used to isolate external mud and prevent external mud from entering the remote gamma measurement device 100 during drilling.

[0048] The main control and power board 30 can refer to the control circuit that processes and amplifies the signal from the gamma sensor 40, as well as the component that controls the power supply. The connection method with the mounting frame 20 can be, but is not limited to, adhesive bonding, bolt connection, riveting, etc.

[0049] The gamma sensor 40 can refer to a component that receives the intensity of gamma rays, and is mounted on the mounting frame 20 and electrically connected to the main control and power board 30.

[0050] The shielding layer 50 can refer to a component used to shield gamma ray signals, and the material can be composed of a high-density tungsten-nickel-iron alloy. The shielding layer 50 is located inside the pressure-resistant cylinder 10. This can be understood as the shielding layer 50 being located on the gamma sensor 40, on the mounting frame 20, or on the inner wall of the pressure-resistant cylinder 10. For example, see reference... Figure 3 The shielding layer 50 can be installed on the frame 20.

[0051] The heat-conducting component 70 can refer to a part used for heat conduction, and its shape can be, but is not limited to, cylindrical and plate-shaped, etc. The heat-conducting component 70 is configured to conduct heat from the gamma sensor 40 to the mounting frame 20. It can be understood that the heat-conducting component 70 can be directly connected to the gamma sensor 40 and the mounting frame 20 to achieve heat transfer, or it can be in contact with the gamma sensor 40 and the mounting frame 20 to achieve heat transfer.

[0052] The first connector assembly 80 can refer to the component that electrically connects the main control unit and the power supply board 30. Additionally, because downhole oil drilling instruments require many functions, and the logging-while-drilling remote gamma measurement device 100 can only measure downhole gamma values, the first connector assembly 80 can also be connected to an external PCD probe. The PCD probe is an additional functional instrument primarily used to measure the wellbore inclination and azimuth of the instrument string.

[0053] The second connector assembly 90 can refer to the component that electrically connects to the gamma sensor 40, or it can be rigidly connected to an external connection. The rigid connection allows for adjustment of the instrument string length, facilitating the operation of the remote gamma measurement device 100 during drilling.

[0054] In the above technical solution, when the gamma sensor 40 of the logging-while-drilling remote gamma measurement device 100 is working, the gamma sensor 40 is prone to generating a lot of heat. In the logging-while-drilling remote gamma measurement device 100 of this utility model, the heat-conducting component 70 has a heat-conducting function, which can conduct the heat generated by the gamma sensor 40 to the mounting frame 20. Since the mounting frame 20 is usually a metal part with a low temperature, the heat-conducting component 70 can enable the gamma sensor 40 to quickly exchange heat with the low-temperature component, which is beneficial to reduce the temperature of the gamma sensor 40.

[0055] According to the remote gamma measurement device 100 for logging while drilling according to the present invention, the heat-conducting element 70 can transfer the heat of the gamma sensor 40 to the mounting frame 20, thereby reducing the temperature of the gamma sensor 40 and preventing the measurement results of the remote gamma measurement device 100 from being affected by the excessive temperature of the gamma sensor 40, thus improving the reliability of the remote gamma measurement device 100 for logging while drilling.

[0056] In some embodiments of this utility model, reference is made to Figure 5 and Figure 6 The heat-conducting component 70 is cylindrical, and the gamma sensor 40 is sleeved inside the heat-conducting component 70.

[0057] In the above technical solution, the heat-conducting component 70 is cylindrical, which can increase the contact surface with the gamma sensor 40, form a uniform heat conduction interface, avoid local overheating, improve the heat conduction efficiency of the heat-conducting component 70, and further improve the reliability of the remote gamma measurement device 100 for logging while drilling.

[0058] In some embodiments of this utility model, reference is made to Figure 4 and Figure 5 The gamma sensor 40 includes a photomultiplier tube 41 and a NaI crystal 42. The photomultiplier tube 41 is located on the side of the NaI crystal 42 close to the main control and power board 30. The heat-conducting component 70 at least covers the side and end face of the NaI crystal 42.

[0059] NaI crystal 42 can be used to convert γ-rays into fluorescent photons with a wavelength of 415 nm through interactions such as the photoelectric effect. Photomultiplier tube 41 can be used to convert the weak scintillation light emitted by NaI crystal 42 into an electrical signal, and amplify it through multiple stages of dynodes to output a measurable current pulse.

[0060] In the above technical solution, the heat generated by the gamma sensor 40 mainly comes from the NaI crystal 42. By wrapping at least the side and end faces of the NaI crystal 42 with the heat-conducting component 70, an efficient heat conduction path can be formed, which can quickly dissipate the heat generated by the NaI crystal 42 absorbing gamma rays, reduce the risk of high temperature damage to the NaI crystal 42, and improve the reliability of the remote gamma measurement device 100 for logging while drilling. In other words, the heat-conducting component 70 can wrap only the NaI crystal 42, or it can wrap both the NaI crystal 42 and the photomultiplier tube 41. This allows for control over the size and materials of the heat-conducting component 70, thereby reducing costs.

[0061] In some embodiments of this utility model, reference is made to Figures 3 to 5 The mounting frame 20 is provided with a mounting groove 20a. The heat-conducting element 70 and the gamma sensor 40 are disposed in the mounting groove 20a. The peripheral side of the heat-conducting element 70 is in contact with the mounting groove 20a, and at least one end of the heat-conducting element 70 in the axial direction is in contact with the mounting groove 20a.

[0062] "The axial direction of the heat-conducting component 70" can be referenced. Figure 3 The left and right directions.

[0063] It is understood that the heat-conducting component 70 can contact the mounting groove 20a at one end in the axial direction, or at both ends in the axial direction. The shape of the mounting groove 20a can match the shape of the gamma sensor 40, which can be, but is not limited to, cylindrical, rectangular, etc. For example, the gamma sensor 40 can be cylindrical, and the mounting groove 20a can be a semi-circular groove.

[0064] In the above technical solution, the peripheral side of the heat-conducting component 70 contacts the mounting groove 20a, and at least one end of the heat-conducting component 70 in the axial direction contacts the mounting groove 20a. This can increase the contact area between the heat-conducting component 70 and the mounting groove 20a, improve the heat conduction efficiency of the heat-conducting component 70, and reduce the risk of high-temperature damage to the NaI crystal 42.

[0065] In some embodiments of this utility model, reference is made to Figures 3 to 5 The heat-conducting component 70 includes a first cylindrical portion 71 and a second cylindrical portion 72. The first cylindrical portion 71 and the second cylindrical portion 72 are arranged and connected along the axial direction of the pressure-resistant cylinder 10. The ends of the first cylindrical portion 71 and the second cylindrical portion 72 that are away from each other are closed ends. The first cylindrical portion 71 is closer to the main control and power board 30 than the second cylindrical portion 72.

[0066] The connection method between the first cylindrical part 71 and the second cylindrical part 72 can be, but is not limited to, welding, riveting, bolting, snap-fitting, flange connection, adhesive bonding, threaded connection, etc.

[0067] Understandably, the closed end of the first cylindrical portion 71 is provided with a first through hole 71a, which can be used for the gamma sensor 40 to electrically connect to the main control and power board 30.

[0068] In the above technical solution, the first cylinder 71 and the second cylinder 72 are arranged and connected along the axial direction of the pressure-resistant cylinder 10. This allows the first cylinder 71 and the second cylinder 72 to be installed at both ends of the gamma sensor 40, respectively. Compared with the integrated heat-conducting component 70, the first cylinder 71 and the second cylinder 72 are smaller in size, which facilitates assembly, reduces the installation difficulty of the heat-conducting component 70, and improves the assembly efficiency of the remote gamma measurement device 100 for logging while drilling.

[0069] In some embodiments of this utility model, reference is made to Figures 4 to 6 A docking position 73 is provided between the first cylindrical part 71 and the second cylindrical part 72. The docking position 73 is located between the two end faces of the photomultiplier tube 41 in the axial direction of the pressure-resistant cylinder 10.

[0070] The docking position 73 can refer to the location of the splice seam between the first cylindrical part 71 and the second cylindrical part 72.

[0071] In the above technical solution, the docking position 73 is located between the two end faces of the photomultiplier tube 41 in the axial direction of the pressure-resistant cylinder 10. This can avoid the mechanical stress that may be transmitted to the NaI crystal 42 by the fastening method of the docking position 73, which could lead to damage to the NaI crystal 42 and improve the reliability of the gamma sensor 40.

[0072] In some embodiments of this utility model, reference is made to Figure 5 The logging-while-drilling remote gamma measurement device 100 includes a temperature detection element 110, which is disposed inside the heat-conducting element 70. A docking position 73 is provided between the first cylinder 71 and the second cylinder 72. The docking position 73 is located between the two end faces of the temperature detection element 110 in the axial direction of the pressure-resistant cylinder 10.

[0073] In the above technical solution, the docking position 73 is located between the two end faces of the temperature sensing element 110 in the axial direction of the pressure-resistant cylinder 10. This facilitates the installation of the temperature sensing element 110 and allows for real-time indirect monitoring of the temperature of the NaI crystal 42, thereby compensating for deviations in the detection results caused by temperature changes and further improving the reliability of the detection results of the remote gamma measurement device 100 during drilling. Since the first cylinder 71 and the second cylinder 72 are docked at the docking position 73, and the docking position 73 is located between the two end faces of the temperature sensing element 110 in the axial direction of the pressure-resistant cylinder 10, the temperature sensing element 110 is close to the splicing position of the first cylinder 71 and the second cylinder 72, making it convenient to assemble the temperature sensing element 110 inside the heat-conducting component 70.

[0074] In some embodiments of this utility model, reference is made to Figure 5 The remote gamma measurement device 100 for logging while drilling includes a metal shielding sleeve 60, a heat-conducting component 70 is fitted inside the metal shielding sleeve 60, and a photomultiplier tube 41 is disposed inside the metal shielding sleeve 60.

[0075] The metal shielding sleeve 60 can refer to a component that shields external signals, and can be, but is not limited to, high-density tungsten alloy, lead or lead-antimony alloy, stainless steel, Hastelloy, and titanium alloy, etc. For example, the material of the metal shielding sleeve 60 can be stainless steel, which can shield external signals, is corrosion-resistant and has high strength, is suitable for harsh environments, and has a low cost.

[0076] Understandably, the metal shielding sleeve 60 is provided with a second through hole 60a, which is connected to the first through hole 71a and can be used to electrically connect the gamma sensor 40 to the main control and power board 30.

[0077] In the above technical solution, the photomultiplier tube 41 is housed within the metal shielding sleeve 60, which can be used to shield external signals, reduce the impact of external signals on the photomultiplier tube 41, and thus prevent external signals from affecting the measurement results of the remote gamma measurement device 100 during logging-while-drilling, thereby improving the reliability of the remote gamma measurement device 100. The metal shielding sleeve 60 is fitted inside the heat-conducting element 70, which can also shield certain external signals. Therefore, it can work together with the metal shielding sleeve 60 to prevent external signals from affecting the photomultiplier tube 41, further improving the reliability of the remote gamma measurement device 100 during logging-while-drilling.

[0078] In some embodiments of this utility model, reference is made to Figure 4 , Figure 5 and Figure 7 The outer side of the metal shielding sleeve 60 is provided with a first step 64. The remote gamma measurement device 100 for logging while drilling includes a temperature detection element 110, which is located on the outer side of the metal shielding sleeve 60 and abuts against the first step 64.

[0079] In the above technical solution, the first step 64 can be used to position and install the temperature detection element 110, and can also improve the space utilization of the gamma sensor 40. The temperature detection element 110 can indirectly monitor the temperature of the NaI crystal 42 in real time, thereby compensating for the deviation of the detection results caused by temperature changes and improving the reliability of the detection results of the remote gamma measurement device 100 for logging while drilling.

[0080] In some embodiments of this utility model, reference is made to Figure 5 and Figure 7 The metal shielding sleeve 60 includes a first part 61, a second part 62 and a transition part 63. The first part 61 and the second part 62 are connected by the transition part 63. The first part 61 is further away from the NaI crystal 42 than the second part 62. The inner diameter of the first part 61 is smaller than the inner diameter of the second part 62. A first step 64 is formed between the transition part 63 and the first part 61.

[0081] In the above technical solution, the first part 61 and the second part 62 are connected by a transition part 63, which can disperse stress, improve the structural strength of the metal shielding sleeve 60, and thus improve the reliability of the metal shielding sleeve 60. The inner diameter of the first part 61 is smaller than the inner diameter of the second part 62, which can save materials and reduce costs. A first step 64 is formed between the transition part 63 and the first part 61, which can be used for positioning and installing the temperature detection element 110, and can also improve the space utilization of the gamma sensor 40.

[0082] In some embodiments of this utility model, reference is made to Figure 5 and Figure 7 The thickness of the transition portion 63 is greater than the wall thickness of the first portion 61 and greater than the wall thickness of the second portion 62.

[0083] In the above technical solution, the thickness of the transition portion 63 is greater than the wall thickness of the first portion 61, which can improve the structural rigidity of the transition portion 63, avoid cracks or fractures caused by fatigue stress, and improve the reliability of the metal shielding sleeve 60. At the same time, the thickened transition portion 63 can also compensate for electromagnetic leakage (such as gap effect) that may occur due to changes in inner diameter, ensure a smooth transition of shielding performance from the first portion 61 to the second portion 62, avoid the penetration of high-frequency interference signals, and further improve the reliability of the metal shielding sleeve 60.

[0084] In some embodiments of this utility model, reference is made to Figure 5 In the axial direction of the pressure-resistant cylinder 10, the length of the first part 61 is greater than the length of the second part 62, and the length of the second part 62 is greater than the length of the transition part 63.

[0085] In the above technical solution, the first part 61 is longer, providing a longer continuous shielding area that completely covers the sensitive operating section of the photomultiplier tube 41, effectively isolating electromagnetic interference generated by external structures such as the bus, and ensuring the reliability of the photomultiplier tube 41. The second part 62 is shorter, retaining basic shielding functions and further ensuring the reliability of the photomultiplier tube 41.

[0086] In some embodiments of this utility model, reference is made to Figure 5 and Figure 7 The transition portion 63 has an inner surface 63a, which includes a straight section 63b and a sloped section 63c connected together. The straight section 63b connects to the first portion 61 and is coplanar with the inner wall surface of the first portion 61. The sloped section 63c connects to the second portion 62.

[0087] In the above technical solution, the design of the straight section 63b and the inclined section 63c can achieve uniform stress distribution, improve the structural strength of the transition part 63, and further improve the structural strength of the metal shielding sleeve 60.

[0088] In some embodiments of this utility model, reference is made to Figure 4 and Figure 5 The shielding layer 50 is disposed on the mounting frame 20, and the length of the shielding layer 50 in the axial direction is greater than the length of the NaI crystal 42 in the axial direction.

[0089] It is understandable that the shielding layer 50 can be embedded in the mounting frame 20 by interference heat, and the mounting frame 20 and the shielding layer 50 are fixed by embedding two pins on each side.

[0090] In the above technical solution, the shielding layer 50 mainly shields the NaI crystal 42 of the gamma sensor 40, so that it cannot receive gamma ray signals in the direction covered by the shielding layer 50, while it can receive gamma ray signals in the uncovered direction, thus creating a layered gamma value.

[0091] In some embodiments of this utility model, reference is made to Figure 2 and Figure 8 The mounting frame 20 is a one-piece molded part. The mounting frame 20 is provided with a mounting groove 20a, a first recessed groove 20b and a second recessed groove 20c. The first recessed groove 20b and the second recessed groove 20c are located on the side of the mounting groove 20a away from the second connector assembly 90, and the first recessed groove 20b and the second recessed groove 20c are located on opposite sides of the mounting frame 20. The heat-conducting component 70 and the gamma sensor 40 are located in the mounting groove 20a. The main control and power board 30 includes a main control circuit board 31 and a power circuit board 32. The main control circuit board 31 is located in the first recessed groove 20b and the power circuit board 32 is located in the second recessed groove 20c.

[0092] In the above technical solution, the mounting frame 20 is a one-piece molded component, which can improve the structural strength of the mounting frame 20 and the reliability of the remote gamma measurement device 100 for logging while drilling. At the same time, it can also eliminate assembly and welding steps, shortening the production cycle.

[0093] In some embodiments of this utility model, reference is made to Figure 2 , Figure 8 and Figure 9 The mounting frame 20 has two pressure caps 21, wiring 22, a first wiring hole 20d, a second wiring hole 20e, and a third wiring hole 20f. The first wiring hole 20d, the second wiring hole 20e, and the third wiring hole 20f are arranged at intervals along the axial direction of the mounting frame 20. The pressure caps 21 are located at both ends of the gamma sensor 40 and have grooves 21a. The wiring 22 passes through the grooves 21a, the first wiring hole 20d, the second wiring hole 20e, and the third wiring hole 20f.

[0094] "The axial direction of the mounting frame 20" can be referenced. Figure 3 The left and right directions.

[0095] The connection between the pressure cap 21 and the mounting frame 20 can be, but is not limited to, welding, bolting, riveting, etc.

[0096] In the above technical solution, the wiring 22 connects the first connector assembly 80, the second connector assembly 90, the gamma sensor 40, the main control and power board 30 via the groove 21a, the first wiring hole 20d, the second wiring hole 20e, and the third wiring hole 20f, thereby enabling communication between the components within the remote gamma measurement device 100 for logging while drilling and improving the reliability of the remote gamma measurement device 100. Simultaneously, the pressure cap 21 can be used to press the gamma sensor 40, limiting its position and preventing it from falling off, further improving the reliability of the remote gamma measurement device 100 for logging while drilling.

[0097] In some embodiments of this utility model, reference is made to Figure 8 The mounting frame 20 is equipped with a top rod 23 and a clamping nut 24. The gamma sensor 40 is axially fixed by the top rod 23 and the clamping nut 24. A metal gasket 25 is installed between the top rod 23 and the gamma sensor 40.

[0098] The metal gasket 25 can be, but is not limited to, alloy steel, stainless steel, aluminum alloy, and composite materials, etc.

[0099] In the above technical solution, the gamma sensor 40 is axially fixed by a push rod 23 and a clamping nut 24, which can further limit the axial movement of the gamma sensor 40 in the mounting frame 20 and improve the stability of the gamma sensor 40. A metal gasket 25 is installed between the push rod 23 and the gamma sensor 40 to protect the gamma sensor 40 and prevent damage.

[0100] In some embodiments of this utility model, reference is made to Figure 2 , Figure 8 and Figure 10 The first connector assembly 80 includes a first fixed shaft 81 and a first connector 82. Part of the first fixed shaft 81 is sleeved on the mounting frame 20 and inner sleeved on the pressure-resistant cylinder 10. The first connector 82 is sleeved on the first fixed shaft 81, and part of the first connector 82 is inner sleeved on the pressure-resistant cylinder 10. The first fixed shaft 81 is provided with a flat key 811, a single-core connector 812 and a grounding spring 813. The first connector 82 is provided with a keyway 82a. The flat key 811 and the keyway 82a are matched.

[0101] The first connector assembly 80 and the mounting frame 20 can be connected by screws.

[0102] The first fixed shaft 81 and the first connector 82 can be connected by threads.

[0103] The first connector 82 can be connected to the external PCD probe via an internal thread, and to the pressure-resistant cylinder 10 via an external thread.

[0104] The single-core connector 812 can be interoperated with and communicate with external PCD probes.

[0105] Understandably, the grounding spring 813 can be gold-plated to better ground the first fixed shaft 81 with the pressure-resistant cylinder 10, thus protecting the remote gamma measurement device 100 for logging while drilling.

[0106] In the above technical solution, the flat key 811 and the keyway 82a are matched, which can prevent the first fixed shaft 81 from rotating, and can also be used to position the opening direction of the gamma sensor 40, making it easier to distinguish the orientation.

[0107] In some embodiments of this utility model, reference is made to Figure 8 The second connector assembly 90 includes a second fixed shaft 91, a second connector 92, and a disc spring 93. Part of the second fixed shaft 91 is sleeved on the mounting frame 20 and inner sleeved on the pressure-resistant cylinder 10. The second connector 92 is sleeved on the second fixed shaft 91, and part of the second connector 92 is inner sleeved on the pressure-resistant cylinder. There are at least two disc springs 93, which are located between the second fixed shaft 91 and the second connector 92.

[0108] The number of disc springs 93 can be, but is not limited to, two, three, four, five, six, etc. For example, the number of disc springs 93 can be five.

[0109] The connection between the second fixed shaft 91 and the mounting frame 20 can be, but is not limited to, screw connection, bolt connection, riveting, etc. For example, the second fixed shaft 91 and the mounting frame 20 can be connected by screws, and the screw type can be a countersunk hex head screw. The second connector 92 can be internally threaded to the external rigid connection and externally threaded to the pressure-resistant cylinder 10.

[0110] Understandably, the second fixed shaft 91 is equipped with a pin and an external thread. The pin can be externally rigidly connected to the upper rubber sleeve insertion hole for interlocking, adjusting the length of the instrument string to facilitate the operation of the remote gamma measurement device 100 for logging while drilling. At the same time, the second fixed shaft 91 can be connected to the pressure-resistant cylinder 10 via the external thread, and the internal structure can be removed from the pressure-resistant cylinder 10 via the external thread for convenient maintenance.

[0111] In the above technical solution, there are at least two disc springs 93, which can further fix the internal structure, prevent the internal structure from loosening, and improve the reliability of the remote gamma measurement device 100 for logging while drilling.

[0112] In some embodiments of this utility model, reference is made to Figures 2 to 4 , Figure 8 The mounting frame 20, the first fixed shaft 81, the first connector 82, the second fixed shaft 91, and the second connector 92 are equipped with multiple O-rings 26.

[0113] The mounting frame 20 can be provided with 4 O-ring seals 26, the first fixed shaft 81 can be provided with 5 O-ring seals 26, the first connector 82 can be provided with 2 O-ring seals 26, the second fixed shaft 91 can be provided with 3 supporting O-ring seals 26, and the second connector 92 can be provided with 2 O-ring seals 26.

[0114] In the above technical solution, the mounting frame 20, the first fixed shaft 81, and the second fixed shaft 91 are equipped with multiple O-rings 26, which can reduce internal structural vibration and also fix the internal structure in the radial direction. The first connector 82 and the second connector 92 are equipped with multiple O-rings 26, which can seal the first connector 82 and the second connector 92 with the pressure-resistant cylinder 10, preventing external mud from entering the interior of the remote gamma measurement device 100 for logging while drilling, thereby improving the reliability of the remote gamma measurement device 100 for logging while drilling.

[0115] In some embodiments of this utility model, reference is made to Figures 2 to 5 The mounting frame 20 is made of aluminum alloy, and the heat-conducting component 70 is made of copper.

[0116] In the above technical solution, the mounting frame 20 is made of aluminum alloy, which reduces its weight while maintaining its structural strength, thus improving the reliability of the remote gamma measurement device 100 for logging while drilling. The heat-conducting component 70 is made of copper, which can quickly absorb and transfer heat, improving its heat dissipation efficiency and further enhancing the reliability of the remote gamma measurement device 100 for logging while drilling. Furthermore, the copper heat-conducting component 70 also facilitates photon reflection, preventing photon escape and thereby improving the photon collection efficiency of the photomultiplier tube 41.

[0117] The following is combined Figures 1 to 8 This describes a specific embodiment of the remote gamma measurement device 100 for logging while drilling according to this utility model.

[0118] The remote gamma measurement device for drilling and logging includes: a pressure-resistant cylinder 10, a mounting frame 20, a main control and power board 30, a gamma sensor 40, a shielding layer 50, a metal shielding sleeve 60, a heat-conducting component 70, a first connector assembly 80, a second connector assembly 90, and a temperature detection component 110.

[0119] The mounting frame 20 is a one-piece molded part, located inside the pressure-resistant cylinder 10. The mounting frame 20 is provided with a mounting groove 20a, a first recessed groove 20b, and a second recessed groove 20c. The first recessed groove 20b and the second recessed groove 20c are located on the side of the mounting groove 20a away from the second connector assembly 90, and the first recessed groove 20b and the second recessed groove 20c are located on opposite sides of the mounting frame 20.

[0120] The main control and power supply board 30 includes a main control circuit board 31 and a power supply circuit board 32. The main control circuit board 31 is located in the first sink 20b, and the power supply circuit board 32 is located in the second sink 20c.

[0121] The gamma sensor 40 includes a photomultiplier tube 41 and a NaI crystal 42, and is disposed in the mounting slot 20a and electrically connected to the main control and power board 30. The photomultiplier tube 41 is disposed on the side of the NaI crystal 42 closer to the main control and power board 30.

[0122] The shielding layer 50 is located inside the pressure-resistant cylinder 10 and is used to shield the peripheral area of ​​the gamma sensor 40.

[0123] The heat-conducting component 70 is cylindrical and encloses the gamma sensor 40. The peripheral side of the heat-conducting component 70 contacts the mounting groove 20a, and both ends of the heat-conducting component 70 in the axial direction also contact the mounting groove 20a. The heat-conducting component 70 includes a first cylindrical portion 71 and a second cylindrical portion 72, which are arranged and joined along the axial direction of the pressure-resistant cylinder 10. The ends of the first cylindrical portion 71 and the second cylindrical portion 72 that are furthest from each other are closed ends. The first cylindrical portion 71 is closer to the main control and power board 30 than the second cylindrical portion 72. A docking position 73 is provided between the first cylindrical portion 71 and the second cylindrical portion 72, located between the two end faces of the temperature sensing component 110 in the axial direction of the pressure-resistant cylinder 10.

[0124] The first connector assembly 80 is located on the pressure-resistant cylinder 10 and is electrically connected to the main control and power supply board 30.

[0125] The second connector assembly 90 is disposed on the pressure-resistant cylinder 10 and electrically connected to the gamma sensor 40. The second connector assembly 90 includes a second fixed shaft 91, a second connector 92, and a disc spring 93. Part of the second fixed shaft 91 is sleeved on the mounting frame 20 and inner sleeved on the pressure-resistant cylinder 10. The second connector 92 is sleeved on the second fixed shaft 91, and part of the second connector 92 is inner sleeved on the pressure-resistant cylinder. There are at least two disc springs 93, which are disposed between the second fixed shaft 91 and the second connector 92.

[0126] Temperature sensing element 110 is located inside heat-conducting element 70.

[0127] The metal shielding sleeve 60 is fitted inside the heat-conducting component 70, and the photomultiplier tube 41 is located inside the metal shielding sleeve 60.

[0128] In the description of this specification, references to terms such as "some embodiments," "optionally," "furthermore," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0129] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A remote gamma measurement device for logging while drilling, characterized in that, include: Pressure-resistant cylinder; The mounting frame is disposed inside the pressure-resistant cylinder; The main control and power supply board are mounted on the mounting frame. A gamma sensor is mounted on the mounting frame and electrically connected to the main control and power board. A shielding layer is disposed inside the pressure-resistant cylinder to shield the peripheral area of ​​the gamma sensor. A thermal conductive element configured to conduct heat from the gamma sensor to the mounting frame; The first connector assembly is disposed on the pressure-resistant cylinder and electrically connected to the main control and power supply board; The second connector assembly is disposed on the pressure-resistant cylinder and electrically connected to the gamma sensor.

2. The remote gamma measurement device for logging while drilling according to claim 1, characterized in that, The heat-conducting component is cylindrical, and the gamma sensor is sleeved inside the heat-conducting component.

3. The remote gamma measurement device for logging while drilling according to claim 2, characterized in that, The gamma sensor includes a photomultiplier tube and a NaI crystal. The photomultiplier tube is located on the side of the NaI crystal close to the main control and power board. The heat-conducting component at least covers the side and end face of the NaI crystal.

4. The remote gamma measurement device for logging while drilling according to claim 2 or 3, characterized in that, The mounting frame is provided with a mounting groove, the heat-conducting component and the gamma sensor are disposed in the mounting groove, the peripheral side of the heat-conducting component is in contact with the mounting groove, and at least one end of the heat-conducting component in the axial direction is in contact with the mounting groove.

5. The remote gamma measurement device for logging while drilling according to claim 2, characterized in that, The heat-conducting component includes a first cylindrical section and a second cylindrical section, which are arranged and connected along the axial direction of the pressure-resistant cylinder. The ends of the first cylindrical section and the second cylindrical section that are away from each other are closed ends. The first cylindrical section is closer to the main control and power board than the second cylindrical section.

6. The remote gamma measurement device for logging while drilling according to claim 5, characterized in that, The gamma sensor includes a photomultiplier tube and a NaI crystal. The photomultiplier tube is disposed on the side of the NaI crystal near the main control and power board. A docking position is provided between the first cylindrical part and the second cylindrical part. The docking position is located between the two end faces of the photomultiplier tube in the axial direction of the pressure-resistant cylinder.

7. The remote gamma measurement device for logging while drilling according to claim 5 or 6, characterized in that, The logging-while-drilling remote gamma measurement device includes a temperature detection element, which is disposed inside the heat-conducting element. A docking position is provided between the first cylinder and the second cylinder, and the docking position is located between the two end faces of the temperature detection element in the axial direction of the pressure-resistant cylinder.

8. The remote gamma measurement device for logging while drilling according to claim 6, characterized in that, The logging-while-drilling remote gamma measurement device includes a metal shielding sleeve, which is fitted inside the heat-conducting component, and the photomultiplier tube is disposed inside the metal shielding sleeve.

9. The remote gamma measurement device for logging while drilling according to any one of claims 1 to 3, 5 or 6, characterized in that, The mounting frame is a one-piece molded part. The mounting frame is provided with a mounting groove, a first recessed groove and a second recessed groove. The first recessed groove and the second recessed groove are located on the side of the mounting groove away from the second connector assembly, and the first recessed groove and the second recessed groove are located on opposite sides of the mounting frame. The heat-conducting component and the gamma sensor are located in the mounting groove. The main control and power board includes a main control circuit board and a power circuit board. The main control circuit board is located in the first recessed groove and the power circuit board is located in the second recessed groove.

10. The remote gamma measurement device for logging while drilling according to any one of claims 1 to 3, 5 or 6, characterized in that, The second connector assembly includes a second fixed shaft, a second connector, and a disc spring. A portion of the second fixed shaft is sleeved on the mounting frame and inner sleeved on the pressure-resistant cylinder. The second connector is sleeved on the second fixed shaft, and a portion of the second connector is inner sleeved on the pressure-resistant cylinder. There are at least two disc springs, which are located between the second fixed shaft and the second connector.

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