Anti-seismic natural gamma logging instrument detection device and assembling method

Abstract

The anti-seismic natural gamma-ray logging instrument detection device comprises a gamma-ray detector damping body, the two ends of the gamma-ray detector damping body are fixedly connected with centralizing end plates correspondingly, and the centers of the gamma-ray detector damping body and the centralizing end plates are jointly provided with a threading pipe in a penetrating mode in the length direction; two sets of fixing units are arranged in the gamma detector damping body in the length direction at intervals, each set of fixing units comprises four cavity type fixing bins, and the four fixing bins are evenly distributed in the circumferential direction of the threading pipe. The four fixing bins of one set of fixing units and the four fixing bins of the other set of fixing units are arranged in a one-to-one staggered mode in the circumferential direction of the threading pipe, and each fixing bin is filled with a gamma detector. The invention further discloses an assembling method of the anti-seismic natural gamma-ray logging instrument detection device. The problem that in the prior art, due to the fact that a natural gamma-ray logging instrument is poor in anti-seismic performance, a gamma-ray detector is damaged and cannot work is solved.

Description

Technical Field

[0001] This invention belongs to the field of oil well logging equipment technology, specifically relating to a seismic-resistant natural gamma logging instrument detection device, and further specifically relating to an assembly method for the seismic-resistant natural gamma logging instrument detection device. Background Technology

[0002] Natural gamma logging is a type of oil well logging instrument. Existing natural gamma logging instruments utilize the different energies and quantities of gamma rays produced by radioactive nuclides in the formation. They use scintillation detectors to receive gamma rays, and after photoelectric signal conversion and processing, form gamma curves. These curves are used to delineate geological profiles, determine the clay content of formations, solve geological problems related to clay, perform formation correlation, track perforations, and locate radioactive minerals.

[0003] Existing natural gamma logging instruments use scintillation detectors composed of photomultiplier tubes (PMTs) and sodium iodide crystals. A PMT is an electrovacuum device. Its structure is typically divided into end-window and side-window types. Both structures use borosilicate glass or ultraviolet-transmitting glass as the window material. The internal structure is generally a box-grid type for focusing the electric field, formed by welding together the dynodes. Sodium iodide crystal is an inorganic scintillator, a transparent crystal, primarily composed of NaI.

[0004] The energy generated by the perforation projectile explosion propagates through the natural gamma logging instrument itself and the well fluid in the form of shock waves. This propagation is characterized by its short duration (microseconds) and high instantaneous acceleration (greater than 200g), representing energy transfer with an anisotropic path. The anti-seismic measures in natural gamma logging instruments essentially reduce the impact acceleration generated by the perforation projectile explosion, prolonging the time it takes for this acceleration to reach the gamma detector. This ensures that the energy generated by the explosion is absorbed or dispersed by other components, minimizing the energy directly transferred to the gamma detector.

[0005] Both photomultiplier tubes and sodium iodide crystals are brittle and have poor shock resistance. During well logging operations, especially perforation, the detonation of the perforating gun generates enormous impact vibrations and collisions, which can cause permanent damage to the gamma detector. Therefore, during perforation, the natural gamma logging instrument must be run down the well twice, once to correct the target layer depth and once for perforation. The first run involves magnetic positioning, using the natural gamma logging instrument, and three instruments: magnetic positioning and acoustic amplitude-density (ADC) logging. After obtaining the natural gamma logging curve, it is compared with the original open-hole logging curve to verify the depth and determine the target layer. Then, the natural gamma logging instrument and ADC logging are removed, and a perforating gun is installed. The second run involves magnetic positioning and the perforating gun to complete the perforation. The disadvantages of this process are the long time required for logging depth correction and perforation, increased well crew operating costs, and reduced logging efficiency.

[0006] The seismic performance of a natural gamma ray logging (NGR) test instrument depends on the effectiveness of its seismic mitigation measures. If these measures reduce vibrations to an acceptable range, the instrument can operate normally. However, in pursuit of high count rates, some existing NGR test instruments use large crystals and photomultiplier tubes without prioritizing practicality, resulting in excessively large length-to-diameter ratios and reduced seismic performance. Furthermore, if the gamma ray detector malfunctions, the entire instrument becomes inoperable, indicating low fault redundancy. Summary of the Invention

[0007] The purpose of this invention is to provide a seismic-resistant natural gamma logging instrument detection device, which solves the problem in the prior art where the poor seismic performance of natural gamma logging instruments leads to damage to the gamma detector and inability to work.

[0008] Another objective of this invention is to provide a method for assembling an earthquake-resistant natural gamma logging instrument.

[0009] The technical solution adopted in this invention is an anti-seismic natural gamma logging tool detection device, including a gamma detector shock absorber, with a straightening end plate fixedly connected to both ends of the gamma detector shock absorber. A conduit is installed through the center of the gamma detector damper and the straightening end plate along the length direction, and the two ends of the conduit are fixed to the straightening end plates at both ends of the gamma detector damper. The gamma detector damper body has two sets of fixed units spaced apart along its length. Each set of fixed units includes four cavity-type fixed chambers. The four fixed chambers are evenly distributed along the circumference of the conduit. The four fixed chambers of one set of fixed units are staggered with the four fixed chambers of the other set of fixed units along the circumference of the conduit. Each fixed chamber is filled with a gamma detector.

[0010] The invention is further characterized by: Each straightening end plate is fixedly connected to a shock-absorbing spring on the side away from the gamma detector shock absorber. Each shock-absorbing spring is fixedly connected to a shock-absorbing rubber block at the end away from the straightening end plate. Each shock-absorbing rubber block has a central hole along its length.

[0011] The conduit contains transmission lines that extend beyond both ends. Each gamma detector is equipped with a connecting line. The conduit has through holes on its wall inside the gamma detector's damping body and near both ends of the damping body. The connecting lines of the gamma detectors in each fixed chamber enter the conduit through the through holes at the corresponding ends and extend out from the corresponding ends of the conduit. The transmission lines and connecting lines extending out from each end of the conduit pass through the damping springs on the corresponding sides and exit through the central holes on the corresponding sides.

[0012] The four fixed compartments of one set of fixed units are the same in shape and size as the four fixed compartments of another set of fixed units, but in the opposite direction.

[0013] The four fixed compartments of one set of fixed units are offset from the four fixed compartments of another set of fixed units by an angle of 40° to 50°.

[0014] The two ends of the gamma detector's damping body are fixedly connected to the straightening end plate by positioning pins.

[0015] Both ends of the conduit are threaded with nuts, which abut against the side wall of the straightening end plate away from the gamma detector damper.

[0016] Another technical solution adopted in this invention is a method for assembling an anti-seismic natural gamma logging tool, which is implemented according to the following steps: Step 1: Fill each fixed chamber of the gamma detector damper with a gamma detector and place two straightening end plates at both ends of the gamma detector damper. Step 2: Pass the conduit through the gamma detector damper and the straightening end plates at both ends. Then, fix the two ends of the conduit to the outside of the straightening end plates at both ends of the gamma detector damper with nuts. Finally, pass the transmission line through the conduit. Step 3: Connect a damping spring to the side of each straightening end plate away from the gamma detector damping body, and connect a damping rubber block with a central hole to the end of the damping spring away from the straightening end plate. Step 4: Insert the external connecting wires of each gamma detector in each fixed unit into the inside of the conduit through the wire hole. The connecting wires and transmission wires pass through the inside of the shock-absorbing spring and exit through the center hole.

[0017] The beneficial effects of this invention are as follows: The anti-seismic natural gamma logging instrument detection device of this invention is installed in the anti-seismic natural gamma logging instrument and used for perforation operations. The instrument is directly connected to the perforation gun. The depth is calibrated first, then perforation is performed, and then the perforation quality is tested. This can be completed in one well operation without changing the supporting external equipment. While meeting the requirements of perforation depth calibration, it also takes into account the anti-seismic performance of the gamma detector. The anti-seismic natural gamma logging instrument detection device has high fault redundancy. Even if some gamma detectors are damaged, the other gamma detectors can still continue to work, ensuring that logging operations can continue, reducing logging time occupied, reducing workload, improving work efficiency, enhancing timeliness, and saving costs. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the anti-seismic natural gamma logging tool detection device of the present invention; Figure 2 for Figure 1 A cross-sectional view at point QQ; Figure 3 for Figure 1 Cross-sectional view of the damping body of the medium gamma detector.

[0019] In the diagram, 1. Gamma detector shock absorber, 2. Straightening end plate, 3. Conduit, 4. Fixing chamber, 5. Shock-absorbing spring, 6. Shock-absorbing rubber block, 7. Center hole. Detailed Implementation

[0020] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0021] The seismic-resistant natural gamma ray logging tool detection device is located inside the pressure-bearing outer shell of the seismic-resistant natural gamma ray logging instrument, such as... Figure 1 As shown, the anti-seismic natural gamma ray logging tool detection device includes a gamma ray detector damping body 1, which is formed by one-time casting of high-temperature epoxy resin and is located in the middle of the anti-seismic natural gamma ray logging tool detection device. Both ends of the gamma ray detector damping body 1 are fixedly connected to a centralizing end plate 2, which is also fixedly connected to the centralizing end plate 2 by positioning pins to prevent the gamma ray detector damping body 1 from rotating relative to the centralizing end plate 2.

[0022] A conduit 3 is installed along the length of both the gamma detector damper 1 and the straightening end plate 2. Both ends of the conduit 3 are fixed to the straightening end plates 2 at both ends of the gamma detector damper 1. Nuts are threaded to both ends of the conduit 3, and the nuts abut against the side wall of the straightening end plate 2 away from the gamma detector damper 1.

[0023] Each straightening end plate 2 has a damping spring 5 fixedly connected to the side away from the gamma detector damper 1. Each damping spring 5 has a damping rubber block 6 fixedly connected to the end away from the straightening end plate 2. Each damping rubber block 6 has a central hole 7 along its length. The damping rubber block 6 is made of sponge rubber, the damping spring 5 is made of steel, and the straightening end plate 2 is made of aluminum alloy. The damping spring 5 is used to buffer the vibration of the perforation hole on the gamma detector damper 1, reducing the impact of vibration on the gamma detector damper 1. The straightening end plate 2 ensures that the gamma detector damper 1 moves axially.

[0024] like Figure 2 As shown, two sets of fixing units are spaced apart along the length of the gamma detector damper 1. Each set of fixing units includes four cavity-type fixing chambers 4, which are evenly distributed along the circumference of the conduit 3. Figure 3The four fixed chambers 4 of one set of fixed units are staggered one-to-one with the four fixed chambers 4 of another set of fixed units along the circumference of the conduit 3; each fixed chamber is filled with a gamma detector. The four fixed chambers of one set of fixed units are the same shape and size as the four fixed chambers of the other set of fixed units, but in opposite directions. The staggered angle between the four fixed chambers of one set of fixed units and the four fixed chambers of the other set of fixed units is 40° to 50°. In order to reduce the violent vibration generated by the explosion of the perforated projectile, reduce the intensity of the shock wave propagation, prolong the vibration transmission time, make full use of the elasticity of the high-temperature epoxy resin, and prevent the vibration from being transmitted entirely along the steel shell of one set of gamma detectors to the other set of gamma detectors, the two sets of gamma detectors are staggered by an angle of 40° to 50° to reduce the direct impact area. The spacing between each set of gamma detectors is uniform, and they are sealed into a whole by high-temperature epoxy resin.

[0025] A transmission line is threaded inside the conduit 3, extending out from both ends of the conduit 3. Each gamma detector is equipped with a connecting line. The conduit 3 has wire-passing holes on its wall inside the gamma detector damper 1 and near the two ends of the gamma detector damper 1. The connecting line of the gamma detector filled in each fixed chamber extends into the conduit 3 through the wire-passing hole at the corresponding end and extends out from the corresponding end of the conduit 3. The transmission line and connecting line extending out from each end of the conduit 3 pass through the inside of the damping spring 5 on the corresponding side and exit through the center hole 7 on the corresponding side.

[0026] The gamma detector's connection wires include signal output, high voltage input, and ground wire; the transmission lines inside the conduit include power lines, bus lines, signal lines, and ground wire; both the transmission lines and connection wires pass through the internal space of the shock-absorbing spring 5 and emerge from the central hole 7 inside the shock-absorbing rubber block 6. One end of the transmission lines and connection wires are connected to the signal processing section of the natural gamma logging instrument to transmit gamma signals, and the other end is connected to the lower connector of the natural gamma logging instrument.

[0027] The assembly method of the earthquake-resistant natural gamma logging tool detection device shall be implemented according to the following steps: Step 1: Fill each fixed chamber 4 of the gamma detector damper 1 with a gamma detector and place two straightening end plates 2 at both ends of the gamma detector damper 1. Step 2: Pass the conduit 3 through the inside of the gamma detector damper 1 and the straightening end plates 2 at both ends of it. Then, fix the two ends of the conduit 3 to the outside of the straightening end plates 2 at both ends of the gamma detector damper 1 with nuts. Then, pass the transmission line through the inside of the conduit 3. Step 3: Connect a shock-absorbing spring 5 to the side of each straightening end plate 2 away from the gamma detector shock absorber 1, and connect a shock-absorbing rubber block 6 with a central hole 7 to the end of the shock-absorbing spring 5 away from the straightening end plate. Step 4: Insert the external connecting wires of each gamma detector in each fixed unit into the inside of the conduit 3 through the wire hole. The connecting wires and transmission wires pass through the inside of the shock-absorbing spring 5 and exit from the center hole 7.

[0028] Example 1 The anti-seismic natural gamma logging tool includes a gamma detector damping body 1. Both ends of the gamma detector damping body 1 are fixedly connected to a centralizing end plate 2. A conduit 3 runs through the center of both the gamma detector damping body 1 and the centralizing end plate 2 along the length direction. Both ends of the conduit 3 are fixedly connected to the centralizing end plates 2 at both ends of the gamma detector damping body 1. Two sets of fixing units are spaced apart along the length direction inside the gamma detector damping body 1. Each fixing unit includes four hollow fixing chambers 4, which are evenly distributed along the circumference of the conduit 3. The four fixing chambers 4 of one fixing unit are staggered from the four fixing chambers 4 of the other fixing unit along the circumference of the conduit 3. Each fixing chamber 4 is filled with a gamma detector.

[0029] Each straightening end plate 2 is fixedly connected to a shock-absorbing spring 5 on the side away from the gamma detector shock absorber 1. Each shock-absorbing spring 5 is fixedly connected to a shock-absorbing rubber block 6 at the end away from the straightening end plate 2. Each shock-absorbing rubber block 6 has a center hole 7 along its length.

[0030] Example 2 The anti-seismic natural gamma logging tool includes a gamma detector damping body 1. Both ends of the gamma detector damping body 1 are fixedly connected to a centralizing end plate 2. A conduit 3 runs through the center of both the gamma detector damping body 1 and the centralizing end plate 2 along the length direction. Both ends of the conduit 3 are fixedly connected to the centralizing end plates 2 at both ends of the gamma detector damping body 1. Two sets of fixing units are spaced apart along the length direction inside the gamma detector damping body 1. Each fixing unit includes four hollow fixing chambers 4, which are evenly distributed along the circumference of the conduit 3. The four fixing chambers 4 of one fixing unit are staggered from the four fixing chambers 4 of the other fixing unit along the circumference of the conduit 3. Each fixing chamber 4 is filled with a gamma detector.

[0031] Each straightening end plate 2 is fixedly connected to a shock-absorbing spring 5 on the side away from the gamma detector shock absorber 1. Each shock-absorbing spring 5 is fixedly connected to a shock-absorbing rubber block 6 at the end away from the straightening end plate 2. Each shock-absorbing rubber block 6 has a center hole 7 along its length.

[0032] A transmission line is installed inside the conduit 3, extending out from both ends of the conduit 3. Each gamma detector is equipped with a connecting line. The conduit 3 has wire-passing holes on its wall inside the gamma detector damper 1 and near the two ends of the gamma detector damper 1. The connecting line of the gamma detector filled in each fixed chamber extends into the conduit 3 through the wire-passing hole at the corresponding end and extends out from the corresponding end of the conduit 3. The transmission line and connecting line extending out from each end of the conduit 3 pass through the inside of the damping spring 5 on the corresponding side and exit through the center hole 7 on the corresponding side.

[0033] The four fixed chambers 4 of one set of fixed units are identical in shape and size to the four fixed chambers 4 of the other set of fixed units, but in opposite directions. The four fixed chambers 4 of one set of fixed units are offset from the four fixed chambers 4 of the other set of fixed units by an angle of 45°.

[0034] Both ends of the gamma detector damper 1 are fixedly connected to the straightening end plate 2 by positioning pins. Both ends of the conduit 3 are threaded with nuts, which abut against the side wall of the straightening end plate 2 away from the gamma detector damper 1.

[0035] Example 3 The anti-seismic natural gamma logging tool includes a gamma detector damping body 1. A centering end plate 2 is fixedly connected to both ends of the gamma detector damping body 1. A conduit 3 runs through the center of both the gamma detector damping body 1 and the centering end plate 2 along the length direction. Both ends of the conduit 3 are fixedly connected to the centering end plates 2 at both ends of the gamma detector damping body 1. Two sets of fixing units are spaced apart along the length direction inside the gamma detector damping body 1. Each fixing unit includes four hollow fixing chambers 4. The four fixing chambers 4 are evenly distributed along the circumference of the conduit 3. The four fixing chambers 4 of one fixing unit are staggered with the four fixing chambers 4 of the other fixing unit along the circumference of the conduit 3. Each fixing chamber 4 is filled with a gamma detector.

[0036] Each straightening end plate 2 is fixedly connected to a shock-absorbing spring 5 on the side away from the gamma detector shock absorber 1. Each shock-absorbing spring 5 is fixedly connected to a shock-absorbing rubber block 6 at the end away from the straightening end plate 2. Each shock-absorbing rubber block 6 has a center hole 7 along its length.

[0037] A transmission line is installed inside the conduit 3, extending out from both ends of the conduit 3. Each gamma detector is equipped with a connecting line. The conduit 3 has wire-passing holes on its wall inside the gamma detector damper 1 and near the two ends of the gamma detector damper 1. The connecting line of the gamma detector filled in each fixed chamber extends into the conduit 3 through the wire-passing hole at the corresponding end and extends out from the corresponding end of the conduit 3. The transmission line and connecting line extending out from each end of the conduit 3 pass through the inside of the damping spring 5 on the corresponding side and exit through the center hole 7 on the corresponding side.

[0038] The four fixed chambers 4 of one set of fixed units are identical in shape and size to the four fixed chambers 4 of the other set of fixed units, but in opposite directions. The four fixed chambers 4 of one set of fixed units are offset from the four fixed chambers 4 of the other set of fixed units by an angle of 40°.

[0039] Both ends of the gamma detector damper 1 are fixedly connected to the straightening end plate 2 by positioning pins. Both ends of the conduit 3 are threaded with nuts, which abut against the side wall of the straightening end plate 2 away from the gamma detector damper 1.

[0040] Example 4 The anti-seismic natural gamma logging tool includes a gamma detector damping body 1. A centering end plate 2 is fixedly connected to both ends of the gamma detector damping body 1. A conduit 3 runs through the center of both the gamma detector damping body 1 and the centering end plate 2 along the length direction. Both ends of the conduit 3 are fixedly connected to the centering end plates 2 at both ends of the gamma detector damping body 1. Two sets of fixing units are spaced apart along the length direction inside the gamma detector damping body 1. Each fixing unit includes four hollow fixing chambers 4. The four fixing chambers 4 are evenly distributed along the circumference of the conduit 3. The four fixing chambers 4 of one fixing unit are staggered with the four fixing chambers 4 of the other fixing unit along the circumference of the conduit 3. Each fixing chamber 4 is filled with a gamma detector.

[0041] Each straightening end plate 2 is fixedly connected to a shock-absorbing spring 5 on the side away from the gamma detector shock absorber 1. Each shock-absorbing spring 5 is fixedly connected to a shock-absorbing rubber block 6 at the end away from the straightening end plate 2. Each shock-absorbing rubber block 6 has a center hole 7 along its length.

[0042] A transmission line is installed inside the conduit 3, extending out from both ends of the conduit 3. Each gamma detector is equipped with a connecting line. The conduit 3 has wire-passing holes on its wall inside the gamma detector damper 1 and near the two ends of the gamma detector damper 1. The connecting line of the gamma detector filled in each fixed chamber extends into the conduit 3 through the wire-passing hole at the corresponding end and extends out from the corresponding end of the conduit 3. The transmission line and connecting line extending out from each end of the conduit 3 pass through the inside of the damping spring 5 on the corresponding side and exit through the center hole 7 on the corresponding side.

[0043] The four fixed chambers 4 of one set of fixed units are identical in shape and size to the four fixed chambers 4 of the other set of fixed units, but in opposite directions. The four fixed chambers 4 of one set of fixed units are offset from the four fixed chambers 4 of the other set of fixed units by an angle of 50°.

[0044] Both ends of the gamma detector damper 1 are fixedly connected to the straightening end plate 2 by positioning pins. Both ends of the conduit 3 are threaded with nuts, which abut against the side wall of the straightening end plate 2 away from the gamma detector damper 1.

[0045] Example 5 The anti-seismic natural gamma logging tool includes a gamma detector damping body 1. A centering end plate 2 is fixedly connected to both ends of the gamma detector damping body 1. A conduit 3 runs through the center of both the gamma detector damping body 1 and the centering end plate 2 along the length direction. Both ends of the conduit 3 are fixedly connected to the centering end plates 2 at both ends of the gamma detector damping body 1. Two sets of fixing units are spaced apart along the length direction inside the gamma detector damping body 1. Each fixing unit includes four hollow fixing chambers 4. The four fixing chambers 4 are evenly distributed along the circumference of the conduit 3. The four fixing chambers 4 of one fixing unit are staggered with the four fixing chambers 4 of the other fixing unit along the circumference of the conduit 3. Each fixing chamber 4 is filled with a gamma detector.

[0046] Each straightening end plate 2 is fixedly connected to a shock-absorbing spring 5 on the side away from the gamma detector shock absorber 1. Each shock-absorbing spring 5 is fixedly connected to a shock-absorbing rubber block 6 at the end away from the straightening end plate 2. Each shock-absorbing rubber block 6 has a center hole 7 along its length.

[0047] A transmission line is installed inside the conduit 3, extending out from both ends of the conduit 3. Each gamma detector is equipped with a connecting line. The conduit 3 has wire-passing holes on its wall inside the gamma detector damper 1 and near the two ends of the gamma detector damper 1. The connecting line of the gamma detector filled in each fixed chamber extends into the conduit 3 through the wire-passing hole at the corresponding end and extends out from the corresponding end of the conduit 3. The transmission line and connecting line extending out from each end of the conduit 3 pass through the inside of the damping spring 5 on the corresponding side and exit through the center hole 7 on the corresponding side.

[0048] The four fixed chambers 4 of one set of fixed units are identical in shape and size to the four fixed chambers 4 of the other set of fixed units, but in opposite directions. The four fixed chambers 4 of one set of fixed units are misaligned by an angle of 46° with the four fixed chambers 4 of the other set of fixed units.

[0049] Both ends of the gamma detector damper 1 are fixedly connected to the straightening end plate 2 by positioning pins. Both ends of the conduit 3 are threaded with nuts, which abut against the side wall of the straightening end plate 2 away from the gamma detector damper 1.

[0050] Example 6 The assembly method for the earthquake-resistant natural gamma logging tool detection device is implemented according to the following steps: Step 1: Fill each fixed chamber 4 of the gamma detector damper 1 with a gamma detector and place two straightening end plates 2 at both ends of the gamma detector damper 1. Step 2: Pass the conduit 3 through the inside of the gamma detector damper 1 and the straightening end plates 2 at both ends of it. Then, fix the two ends of the conduit 3 to the outside of the straightening end plates 2 at both ends of the gamma detector damper 1 with nuts. Then, pass the transmission line through the inside of the conduit 3. Step 3: Connect a shock-absorbing spring 5 to the side of each straightening end plate 2 away from the gamma detector shock absorber 1, and connect a shock-absorbing rubber block 6 with a central hole 7 to the end of the shock-absorbing spring 5 away from the straightening end plate 2. Step 4: Insert the external connecting wires of each gamma detector in each fixed unit into the inside of the conduit 3 through the wire hole. The connecting wires and transmission wires pass through the inside of the shock-absorbing spring 5 and exit from the center hole 7.

Claims

1. An earthquake-resistant natural gamma logging tool detection device, characterized in that, It includes a gamma detector damper (1), and straightening end plates (2) are fixedly connected to both ends of the gamma detector damper (1). The center of the gamma detector damper (1) and the straightening end plate (2) are connected by a conduit (3) along the length direction. The two ends of the conduit (3) are respectively fixed to the straightening end plates (2) at both ends of the gamma detector damper (1). The gamma detector damper (1) has two sets of fixing units spaced apart along its length. Each set of fixing units includes four cavity-type fixing chambers (4). The four fixing chambers (4) are evenly distributed along the circumference of the conduit (3). The four fixing chambers (4) of one set of fixing units and the four fixing chambers (4) of the other set of fixing units are staggered along the circumference of the conduit (3). Each fixing chamber (4) is filled with a gamma detector.

2. The earthquake-resistant natural gamma logging instrument detection device according to claim 1, characterized in that, Each of the straightening end plates (2) is fixedly connected to a shock-absorbing spring (5) on the side away from the gamma detector shock absorber (1), and each of the shock-absorbing springs (5) is fixedly connected to a shock-absorbing rubber block (6) at the end away from the straightening end plate (2). Each of the shock-absorbing rubber blocks (6) has a center hole (7) along the length direction.

3. The earthquake-resistant natural gamma logging instrument detection device according to claim 2, characterized in that, The conduit (3) is equipped with a transmission line, which extends out of both ends of the conduit (3); Each of the gamma detectors is provided with a connecting wire. The conduit (3) has wire holes on the tube wall inside the gamma detector damper (1) and near the two ends of the gamma detector damper (1). The connecting wires of the gamma detectors filled in each fixed chamber extend into the conduit (3) through the wire holes at the corresponding ends and extend out from the corresponding ends of the conduit (3). The transmission lines and connecting wires extending out from each end of the conduit (3) pass through the inside of the damping spring (5) on the corresponding side and exit through the center hole (7) on the corresponding side.

4. The earthquake-resistant natural gamma logging instrument detection device according to claim 1, characterized in that, The four fixed chambers (4) of one set of fixed units are the same in shape and size as the four fixed chambers (4) of the other set of fixed units, but in the opposite direction.

5. The earthquake-resistant natural gamma logging instrument detection device according to claim 1, characterized in that, The four fixed chambers (4) of one set of fixed units are misaligned with the four fixed chambers (4) of another set of fixed units by an angle of 40° to 50°.

6. The earthquake-resistant natural gamma logging instrument detection device according to claim 1, characterized in that, The two ends of the gamma detector damper (1) are fixedly connected to the straightening end plate (2) by positioning pins.

7. The earthquake-resistant natural gamma logging instrument detection device according to claim 1, characterized in that, Both ends of the conduit (3) are threaded with nuts, and the nuts abut against the side wall of the straightening end plate (2) away from the gamma detector damper (1).

8. An assembly method for an earthquake-resistant natural gamma logging tool detection device, characterized in that, The earthquake-resistant natural gamma logging instrument detection device according to any one of claims 1-7 is implemented according to the following steps: Step 1: Fill each of the fixed chambers (4) of the gamma detector damper (1) with a gamma detector and place two straightening end plates (2) at both ends of the gamma detector damper (1). Step 2: Pass the conduit (3) through the inside of the gamma detector damper (1) and the straightening end plates (2) at both ends of it. Then fix the two ends of the conduit (3) to the outside of the straightening end plates (2) at both ends of the gamma detector damper (1) with nuts. Then pass the transmission line through the inside of the conduit (3). Step 3: Connect a shock-absorbing spring (5) to the side of each straightening end plate (2) away from the gamma detector shock absorber (1), and connect a shock-absorbing rubber block (6) with a central hole (7) to the end of the shock-absorbing spring (5) away from the straightening end plate. Step 4: Insert the external connecting wires of each gamma detector in each fixed unit into the inside of the conduit (3) through the wire hole. The connecting wires and transmission wires pass through the inside of the shock-absorbing spring (5) and come out through the central hole (7).

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