Detector for exploratory well

Abstract

The embodiment of the utility model provides a detector for an exploratory well. The detector for the exploratory well comprises a shell; the detector main body is arranged in the shell; the fixing assembly is arranged in the shell and is used for fixing the detector main body in the shell; and the buffer material is filled in a gap between the shell and the detector main body and a gap between the shell and the fixing assembly.

Description

Technical Field

[0001] This specification relates to the field of geological detection, and particularly to a detector for exploration wells. Background Art

[0002] Measurement While Drilling (MWD) and Logging While Drilling (LWD) are two common measurement techniques in the drilling industry. Both MWD and LWD can obtain downhole data in real time, providing important reference bases for drilling engineering to improve drilling efficiency, reduce exploration risks, and optimize wellbore trajectories. Both MWD and LWD need to be combined with gamma detectors for measurement. However, when drilling, the operation of the drilling rig will cause high surrounding temperature and strong vibration. For example, the temperature can reach 200°C and the vibration can reach 30G.

[0003] Therefore, it is desired to provide a detector for exploration wells that can ensure the normal use of the detector in a strong vibration and high-temperature environment, avoid the influence of the environment on the detector, and ensure the timeliness and accuracy of downhole data. Summary of the Invention

[0004] One or more embodiments of this specification provide a detector for exploration wells, which includes: a housing; a detector main body disposed in the housing; a fixing component disposed in the housing for fixing the detector main body in the housing; and a buffer material filled in the gaps between the housing and the detector main body and between the housing and the fixing component.

[0005] In some embodiments, the detector main body includes a scintillation crystal, a photomultiplier tube, and a voltage divider. One end of the photomultiplier tube is connected to the scintillation crystal, and the other end of the photomultiplier tube is connected to the voltage divider.

[0006] In some embodiments, the fixing component includes a first fixing portion, a second fixing portion, and a fixing member. The fixing member is fixedly connected to the housing, and the fixing member fixes the first fixing portion and the second fixing portion at different positions along the axial direction of the housing in the housing. Among them, the distance between the first fixing portion and the bottom of the housing is greater than the distance between the second fixing portion and the bottom of the housing; the scintillation crystal, the photomultiplier tube, and the voltage divider are fixed between the first fixing portion and the second fixing portion.

[0007] In some embodiments, the fixing member includes at least three fixing rods and at least three first fixing elements. The at least three fixing rods are arranged in one-to-one correspondence with the at least three first fixing elements. For each fixing rod, one end of the fixing rod is fixed to the bottom of the housing, and the other end of the fixing rod passes through the first fixing portion and the second fixing portion and is fixedly connected to the first fixing element.

[0008] In some embodiments, the outer shell of the voltage divider includes a first layer structure and a second layer structure along the axial direction of the housing. Among them, the distances between the first layer structure and the second layer structure and the bottom of the housing increase in sequence. The radial dimension of the first layer structure is smaller than that of the second layer structure. The second fixing portion fixes the outer shell of the voltage divider. The second fixing portion is a hollow structure inside. The second fixing portion is sleeved on the first layer structure. The inner diameter dimension of the second fixing portion is larger than the radial dimension of the first layer structure and smaller than the radial dimension of the second layer structure.

[0009] In some embodiments, the fixing assembly further includes a fixing sleeve and a second fixing element. The outer shell of the voltage divider further includes a third layer structure. Among them, the distance between the third layer structure and the bottom of the housing is greater than the distance between the second layer structure and the bottom of the housing. The radial dimension of the third layer structure is smaller than that of the second layer structure. The fixing sleeve is in an inverted T shape. The fixing sleeve includes a sleeve and a third fixing portion. Among them, the third fixing portion includes an annular hollow. The sleeve is connected to the inner edge of the annular hollow. The sleeve is sleeved on the photomultiplier tube. The third fixing portion is sleeved on the fixing rod. The third fixing portion is sleeved on the third layer structure. The inner diameter dimension of the third fixing portion is larger than the radial dimension of the third layer structure and smaller than the radial dimension of the second layer structure. The third fixing portion and the second fixing portion are fixedly connected through the second fixing element.

[0010] In some embodiments, a shielding layer is provided on the sleeve.

[0011] In some embodiments, the first fixing element includes a spring washer and a nut; and / or the second fixing element includes a spring washer and a nut.

[0012] In some embodiments, the first dimension is the dimension of the fixing sleeve along the axial direction of the housing, and the second dimension is the dimension between the top surface of the second layer structure and the top surface of the photomultiplier tube. Among them, the difference between the second dimension and the first dimension is 1-3 mm.

[0013] In some embodiments, the buffer material includes at least one of epoxy resin and silicone gel. Description of the Drawings

[0014] This specification will be further described by way of exemplary embodiments, which will be described in detail with reference to the accompanying drawings. These embodiments are not restrictive. In these embodiments, the same reference numerals represent the same structures, where:

[0015] Figure 1 is an exemplary block diagram of a detector for exploration wells shown in some embodiments of this specification;

[0016] Figure 2 is a schematic diagram of a detector for exploration wells shown in some embodiments of this specification;

[0017] Figure 3 is a schematic diagram of a partial structure of a detector for exploration wells shown in some embodiments of this specification;

[0018] Figure 4 is a schematic diagram of a fixing component and a detector main body shown in some embodiments of this specification. Detailed implementation manners

[0019] To more clearly illustrate the technical solutions of the embodiments of this specification, the accompanying drawings required for the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some examples or embodiments of this specification. For those of ordinary skill in the art, without creative efforts, this specification can also be applied to other similar scenarios based on these drawings. Unless obvious from the language context or otherwise stated, the same reference numerals in the figures represent the same structures or operations.

[0020] It should be understood that the "system", "device", "unit" and / or "module" used herein is a way to distinguish different components, elements, parts, portions or assemblies at different levels. However, if other words can achieve the same purpose, the said words can be replaced by other expressions.

[0021] As shown in this specification and the claims, unless the context clearly indicates an exception, words such as "a", "an", "one" and / or "the" are not specifically singular and may also include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of the clearly identified steps and elements, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0022] Flowcharts are used in this specification to illustrate the operations performed by the systems according to the embodiments of this specification. It should be understood that the preceding or subsequent operations are not necessarily executed precisely in sequence. On the contrary, the steps can be processed in reverse order or simultaneously. Also, other operations can be added to these processes, or one or more steps can be removed from these processes.

[0023] Figure 1 is an exemplary block diagram of a detector for exploration wells shown in some embodiments of this specification.

[0024] The exploration well detector 100 can be applied to downhole measurement technologies (e.g., MWD and LWD). The exploration well detector 100 can be installed at a preset position in the drilling pipe to detect one or more types of data downhole. For example, the exploration well detector 100 can be used to detect the density of rock formations. For another example, the exploration well detector 100 can also be used to detect neutron porosity, resistivity, natural gamma, or other similar data. The exploration well detector 100 described in some embodiments of this specification can operate normally in high-temperature and strong vibration environments, thus ensuring real-time acquisition of downhole data and providing important reference for drilling engineering.

[0025] In some embodiments, as Figure 1 shown, the exploration well detector 100 includes a housing 110, a detector main body 120, a fixing component 130, and a buffer material 140.

[0026] The housing 110 can be used to accommodate other structures within the exploration well detector 100 (e.g., the detector main body 120, the fixing component 130, and the buffer material 140, etc.), and protect the aforementioned other structures. The housing 110 can be designed in various structural shapes. Exemplarily, the structural shape of the housing 110 can include but is not limited to cylindrical, cuboid, cube, prism, etc., or other irregular shapes. The material of the housing 110 can be iron, or other materials that can block light and avoid external magnetic field interference (e.g., polytetrafluoroethylene), to ensure the normal operation of the detector main body 120. Exemplarily, the housing 110 is a cylindrical structure made of an aluminum shell, and the diameter of the cylinder can be 9 cm, with a wall thickness of 1 mm.

[0027] In some embodiments, as Figure 2As shown, the housing 110 may include a top cover plate 111, a housing body 112, and a bottom cover plate 113. The aforementioned top cover plate 111 and bottom cover plate 113 may be directly welded to the housing body 112. The aforementioned top cover plate 111 and bottom cover plate 113 may also be detachably connected to the housing body 112. For example, buckles may be provided on the top cover plate 111 and bottom cover plate 113, and the top cover plate 111 and bottom cover plate 113 may be snap-connected to the housing body 112 through the aforementioned buckles. For example, the detector 100 for exploration wells further includes a fixing cover. The aforementioned fixing cover has a hollow cylindrical structure. The hollow part of the fixing cover includes two sections of structures. The inner diameter of the first section of the structure is smaller than the diameter of the top cover plate 111 and / or the bottom cover plate 113, so that it can be limited. Internal threads may be provided on the inner wall of the second section of the structure, and external threads may be provided on the outside of the housing body 112, so as to realize the fixation of the fixing cover and the housing body 112, and thus the top cover plate 111 and / or the bottom cover plate 113 can be connected to and disassembled from the housing body 112.

[0028] In some embodiments, one or more through holes may be provided on the bottom cover plate 113. The signal wire, high-voltage wire, and ground wire in the detector body 120 may pass through the aforementioned one or more through holes to be connected to the outside. For example, three through holes may be provided on the bottom cover plate 113. The signal wire, high-voltage wire, and ground wire in the detector body 120 may pass through the aforementioned three through holes to be connected to a high-voltage cable head, a signal cable head, and a grounding post respectively. For another example, one through hole may be provided on the bottom cover plate 113. The signal wire, high-voltage wire, and ground wire in the detector body 120 may all pass through the aforementioned through hole to be connected to a high-voltage cable head, a signal cable head, and a grounding post.

[0029] The detector body 120 may be used to detect one or more types of data underground. The detector body 120 may be disposed in the housing 110.

[0030] In some embodiments, as Figure 2 shown, the detector body 120 includes a scintillation crystal 121, a photomultiplier tube 122, and a voltage divider 123. One end of the photomultiplier tube 122 is connected to the scintillation crystal 121, and the other end of the photomultiplier tube 122 is connected to the voltage divider 123. The scintillation crystal 121 may convert high-energy radiation (such as gamma rays) into visible light. The photomultiplier tube 122 may convert the optical signal generated by the scintillation crystal 121 into an electrical signal. The aforementioned electrical signal may be analyzed and processed by an electronics system to obtain one or more types of data underground. The aforementioned voltage divider 123 may provide a stable voltage distribution for the photomultiplier tube 122, protect the photomultiplier tube 122 from voltage fluctuations, and ensure that the photomultiplier tube 122 can operate stably and efficiently. More descriptions about the voltage divider can be found in the relevant descriptions below in this specification.

[0031] The fixing component 130 is disposed within the housing 110 and can be used to fix the detector body 120 within the housing, preventing the detector body 120 from moving within the housing 110, which could lead to damage to the detector body 120 or inaccurate measurements.

[0032] In some embodiments, the fixing component 130 can be arranged in various ways to achieve the fixation of the detector body 120. For example, the fixing component 130 includes a plurality of fasteners, on which external threads can be provided. The detector body 120 can be provided with a plurality of internal threaded holes along the circumferential direction, and a plurality of holes can be provided at corresponding positions on the housing body 112. The aforementioned fasteners can pass through the aforementioned plurality of holes and be connected to the internal threaded holes in the detector body 120, thereby achieving the fixation of the detector body 120.

[0033] In some embodiments, the fixing component 130 includes a first fixing portion 131, a second fixing portion 132, and a fixing member. The fixing member is fixedly connected to the housing 110, and the fixing member fixes the first fixing portion 131 and the second fixing portion 132 at different positions along the axial direction of the housing 110 in the housing 110. Among them, the distance between the first fixing portion 131 and the bottom of the housing 110 is greater than the distance between the second fixing portion 132 and the bottom of the housing 110; the scintillation crystal 121, the photomultiplier tube 122, and the voltage divider 123 are fixed between the first fixing portion 131 and the second fixing portion 132. For more descriptions of the foregoing embodiments, reference can be made to the relevant descriptions in the following text of this specification.

[0034] The buffer material 140 can be used to reduce the impact and vibration received by the detector body 120.

[0035] In some embodiments, the buffer material 140 can be filled in the gaps between the housing 110 and the detector body 120 and between the housing 110 and the fixing component 130, thereby absorbing the vibration transmitted from the outside of the housing 110 to the inside of the housing 110, and thus reducing the vibration received by the detector body 120.

[0036] In some embodiments, the buffer material 140 includes at least one of epoxy resin and silicone gel. The aforementioned material has high viscoelasticity and can deform and absorb energy when subjected to external force, and then return to the original state. This process effectively buffers the impact of external force and reduces the vibration energy transmitted to the structure. For example, after the internal structure of the well exploration detector 100 is installed, the epoxy resin base material and the curing agent can be added to the gap between the shell 110 and the detector body 120 and the gap between the shell 110 and the fixing assembly 130, and the two are fully stirred, and the cured epoxy resin can be filled in the aforementioned gap. For another example, after the internal structure of the well exploration detector 100 is installed, the A-type component (for example, siloxane polymer) and the B-type component (for example, catalyst, cross-linking agent, curing agent, etc.) corresponding to the silicone gel can be added to the gap between the shell 110 and the detector body 120 and the gap between the shell 110 and the fixing assembly 130, and the two are fully stirred, and the cured silicone gel can be filled in the aforementioned gap. In some embodiments, a buffer material 140 may be filled in the gap between the housing 110 and the detector body 120 and the gap between the housing 110 and the fixing assembly 130. In some embodiments, different buffer materials 140 may be filled in different positions of the housing 110 to meet different needs. For example, epoxy resin may be filled in the circumference of the housing 110 to isolate the temperature outside the housing 110, and silicone gel may be filled in other areas to enhance the vibration damping effect.

[0037] In some embodiments, the buffer material 140 can also isolate the detector body 120 from the external environment to prevent the detector body 120 from being affected by high temperature. Exemplarily, when the buffer material 140 includes epoxy resin, the thermal conductivity of epoxy resin is low and it will not conduct heat quickly, so that the epoxy resin acts as a barrier between the detector body 120 and the external environment, slowing down the heat transfer speed, thereby achieving a heat insulation effect. In addition, after curing, the epoxy resin can form a dense coating or solid, which can effectively prevent air convection heat transfer and further enhance its heat insulation effect.

[0038] In some embodiments of the present specification, the detector body 120 is disposed in the shell 110 by a fixing assembly 130 and the shell 110 is filled with a buffer material 140 to reduce vibrations to the detector body 120 and prevent high temperatures of the external environment from being transferred to the detector body 120, thereby ensuring normal use of the detector body 120.

[0039] This specification will describe a configuration method of the fixing assembly 130 below.

[0040] In some embodiments, the fixing assembly 130 includes a first fixing portion 131 , a second fixing portion 132 , and a fixing member.

[0041] In some embodiments, the fixing member can be fixedly connected to the housing 110. For example, the fixing member can be fixedly connected to the bottom cover plate 113 in the housing 110. Again, for example, the fixing member can be welded or snapped to one or more of the various structures in the housing 110, so as to achieve the fixed connection between the fixing member and the housing 110. Again, for example, as Figure 4 shown, the fixing member can include a fixing cylinder 1335. An external thread is provided at one end of the fixing cylinder 1335 that is closer to the bottom cover plate 113, and an internal threaded hole is provided in the bottom cover plate 113. The fixing cylinder 1335 can be threadedly connected to the bottom cover plate 113, so as to achieve the fixed connection between the fixing member and the housing 110. It can be understood that the fixing member can also be threadedly connected to other structures in the housing 110 (such as the top cover plate 111, the housing body 112, etc.), so as to achieve the fixed connection between the fixing member and the housing 110.

[0042] In some embodiments, the fixing member can fixedly arrange the first fixing portion 131 and the second fixing portion 132 at different positions along the axial direction of the housing 110 in the housing 110. Among them, the distance between the first fixing portion 131 and the bottom of the housing 110 is greater than the distance between the second fixing portion 132 and the bottom of the housing 110. The scintillation crystal 121, the photomultiplier tube 122, and the voltage divider 123 are fixed between the first fixing portion 131 and the second fixing portion 132. It is worth noting that the axial direction described in each embodiment in this specification is the axial direction of the housing 110.

[0043] In some embodiments, as Figure 4As shown, the fixing member can be a hollow fixing cylinder 1335. The aforementioned fixing cylinder 1335 can be fixedly connected to the housing 110. A first limiting member 1336 is provided on the inner side wall of the aforementioned fixing cylinder 1335. The setting of the aforementioned first limiting member 1336 makes the maximum distance at the corresponding position of the fixing cylinder 1335 smaller than the radial dimension of the second fixing portion 132, thereby restricting the axial position of the second fixing portion 132. The scintillation crystal 121, the photomultiplier tube 122, and the voltage divider 123 can be arranged above the second fixing portion 132 in the axial direction. The first fixing portion 131 can be a hollow upper cover. An internal thread can be provided on the inner side wall of the first fixing portion 131. An external thread can be provided at the upper end of the fixing cylinder 1335 in the axial direction. A protruding portion 1311 is provided on one side of the first fixing portion 131 facing the detector main body 120. As the first fixing portion 131 and the fixing cylinder 1335 are threadedly connected, the protruding portion 1311 abuts against the vertex of the detector main body 120. The first fixing portion 131 and the second fixing portion 132 can clamp the scintillation crystal 121, the photomultiplier tube 122, and the voltage divider 123 in the axial direction, thereby fixing the scintillation crystal 121, the photomultiplier tube 122, and the voltage divider 123 between the first fixing portion 131 and the second fixing portion 132. In some embodiments, one or more of the fixing cylinder 1335, the first fixing portion 131, and the second fixing portion 132 can be a hollowed-out structure to facilitate filling with the buffer material 140.

[0044] In some embodiments, the fixing member includes at least three fixing rods 1331 and at least three first fixing elements 1332. The at least three fixing rods 1331 and the at least three first fixing elements 1332 are arranged in one-to-one correspondence. For each fixing rod 1331, one end of the fixing rod 1331 is fixed to the bottom of the housing 110, and the other end of the fixing rod 1331 passes through the first fixing portion 131 and the second fixing portion 132 and is fixedly connected to the first fixing element 1332. For example, Figure 3 The detector 100 for exploration well shown includes three fixing rods 1331 and three first fixing elements 1332. The aforementioned three fixing rods 1331 and the three first fixing elements 1332 are arranged in one-to-one correspondence. The aforementioned three fixing rods 1331 can be evenly arranged at the bottom of the housing 110, that is, the distance between each fixing rod 1331 and the center point of the housing 110 is the same, and the included angle between the line segments formed by adjacent two fixing rods 1331 and the center point of the housing 110 is 120°. For more content about the fixing of the fixing rod 1331 at the bottom of the housing 110, reference can be made to the relevant description in the foregoing of this specification.

[0045] In some embodiments, the first fixing portion 131 and the second fixing portion 132 may be fixing plates. At least three through holes may be provided on each of the foregoing fixing plates. A second limiting member may be provided on the fixing rod 1331. The radial dimension of the foregoing second limiting member is greater than the radial dimension of the through hole in the second fixing portion 132, so that the second fixing portion 132 can be restricted to a corresponding position. In some embodiments, the foregoing second limiting member may be a limiting nut. External threads may be provided on the fixing rod 1331. By arranging the limiting nut at a corresponding position on the fixing rod 1331 (for example, on the upper and lower sides of the position where the second fixing portion 132 needs to be arranged), the axial position of the second fixing portion 132 can be restricted. In some embodiments, the foregoing second limiting member may also be a protrusion (for example, a convex ring structure) on the fixing rod 1331.

[0046] In some embodiments, external threads may be provided on the fixing rod 1331. The first fixing element 1332 may include a nut (for convenience of description, this nut may be referred to as the first nut) that mates with the foregoing external threads. By arranging the first fixing element 1332 on the side of the first fixing portion 131 away from the detector main body 120 and threadedly connecting it to the external threads on the fixing rod 1331, the distance between the first fixing portion 131 and the second fixing portion 132 can be adjusted by the first nut, and the axial position of the first fixing portion 131 can be restricted. In some embodiments, in addition to the first nut, the first fixing element 1332 may further include a spring washer. The foregoing spring washer may be arranged on the side of the first fixing portion 131 away from the detector main body 120. The first nut may be arranged on the side of the foregoing spring washer away from the first fixing portion 131. The spring washer can generate a radial pressure through its elastic deformation to increase the friction between the first nut and the first fixing portion 131, thereby preventing the first nut from gradually loosening due to vibration, maintaining the stability of the connection, and at the same time reducing the vibration received by the voltage divider 123.

[0047] In some embodiments, after restricting the axial positions of the first fixing portion 131 and the second fixing portion 132, the scintillation crystal 121, the photomultiplier tube 122, and the voltage divider 123 located between the first fixing portion 131 and the second fixing portion 132 are axially clamped, so as to realize the position restriction of the scintillation crystal 121, the photomultiplier tube 122, and the voltage divider 123, and avoid collisions and damage to the scintillation crystal 121, the photomultiplier tube 122, and the voltage divider 123.

[0048] In some embodiments, the radial position of the detector main body 120 can be further defined by the structure of the detector main body 120 itself, so as to avoid the detector main body 120 moving radially and causing collisions.

[0049] Such as Figure 2As shown, the housing of the voltage divider 123 includes a first layer structure 1231 and a second layer structure 1232 along the axial direction of the housing 110. Among them, the distances from the first layer structure 1231 and the second layer structure 1232 to the bottom of the housing 110 increase in sequence, and the radial dimension of the first layer structure 1231 is smaller than that of the second layer structure 1232.

[0050] In some embodiments, the second fixing portion 132 may be an internally hollow structure. The second fixing portion 132 is sleeved on the first layer structure 1231. The inner diameter dimension of the second fixing portion 132 is larger than the radial dimension of the first layer structure 1231 and smaller than the radial dimension of the second layer structure 1232, so as to fix the housing of the voltage divider 123. Through the aforementioned second fixing portion 132, the radial position and the axial position of the voltage divider 123 can be defined. At the same time, since the voltage divider 123 is connected to the photomultiplier tube 122, and the photomultiplier tube 122 is connected to the scintillation crystal 121, the radial position and the axial position of the photomultiplier tube 122 and the scintillation crystal 121 can also be defined. In some embodiments of this specification, the radial position of the detector main body 120 can be further fixed through the second fixing portion 132, preventing the detector main body 120 from being damaged due to a collision in the radial direction. For example, the inner diameter dimension of the second fixing portion 132 is 64 mm, the radial dimension of the first layer structure 1231 is 60 mm, and the radial dimension of the second layer structure 1232 is 66 mm.

[0051] In some embodiments, the difference between the inner diameter dimension of the second fixing portion 132 and the radial dimension of the first layer structure 1231 may be within a first preset difference range (for example, 0.7 - 1.6 mm), so as to avoid the voltage divider 123 shaking in the hollow area of the second fixing portion 132 due to the aforementioned difference being too large, and at the same time avoid the voltage divider 123 being difficult to be sleeved in the hollow area of the second fixing portion 132 due to the difference being too small.

[0052] In some embodiments, an anti-slip structure (for example, a layer of rubber layer) may be further provided on the inner side wall of the second fixing portion 132 sleeved on the first layer structure 1231, so as to reduce the friction between the voltage divider 123 and the second fixing portion 132, and at the same time reduce the vibration received by the detector main body 120.

[0053] As Figure 2 shown, the housing of the voltage divider 123 further includes a third layer structure 1233. Among them, the distance from the third layer structure 1233 to the bottom of the housing 110 is greater than the distance from the second layer structure 1232 to the bottom of the housing 110, and the radial dimension of the third layer structure 1233 is smaller than that of the second layer structure 1232.

[0054] In some embodiments, the fixing assembly 130 further includes a fixing sleeve 1333. As Figure 2and Figure 3 As shown, the aforementioned fixed sleeve 1333 is in an inverted T shape. The fixed sleeve 1333 includes a sleeve 13331 and a third fixing portion 13332. The third fixing portion 13332 includes an annular hollow. The sleeve 13331 is connected to the inner edge of the annular hollow. The inner diameter of the sleeve 13331 is larger than the radial dimension of the photomultiplier tube 122, so that the sleeve 13331 can be sleeved on the photomultiplier tube 122. For example, the inner diameter of the sleeve 13331 is 64 mm. Correspondingly, the inner diameter of the third fixing portion 13332 is also 64 mm. The radial dimension of the first layer structure 1231 is 60 mm, and the radial dimension of the second layer structure 1232 is 66 mm.

[0055] The inner diameter of the third fixing portion 13332 is larger than the radial dimension of the third layer structure 1233 and smaller than the radial dimension of the second layer structure 1232, so that the third fixing portion 13332 can be sleeved on the third layer structure 1233 and sleeved on the fixing rod 1331 through the aforementioned three through holes. The third fixing portion 13332 can be a fixing plate. At least three through holes can be provided on the fixing plate. A third limiting member can be provided on the fixing rod 1331. The radial dimension of the third limiting member is larger than the radial dimension of the through holes in the third fixing portion 13332. The third limiting member can be a second fixing element 1334 or other structures (for example, a convex ring structure). More content about the second fixing element 1334 can be found in the relevant description below in this specification.

[0056] In some embodiments, the difference between the inner diameter of the third fixing portion 13332 and the radial dimension of the third layer structure 1233 can be within a second preset difference range (for example, 0.7 - 1.6 mm), so as to avoid the voltage divider 123 shaking in the hollow area of the third fixing portion 13332 due to the excessive difference, and also avoid the voltage divider 123 being sleeved in the hollow area of the third fixing portion 13332 due to the too small difference.

[0057] In some embodiments, an anti-slip structure can also be provided on the inner side wall of the third fixing portion 13332 sleeved on the third layer structure 1233, so as to reduce the friction between the voltage divider 123 and the third fixing portion 13332, and at the same time, reduce the vibration received by the detector main body 120.

[0058] In some embodiments, the fixing component 130 further includes a second fixing element 1334. The third fixing portion 13332 disposed on the upper end surface of the second layer structure 1232 and the second fixing portion 132 disposed on the lower end surface of the second layer structure 1232 can be fixedly connected through the second fixing element 1334, so as to clamp the voltage divider 123, and can simultaneously restrict the radial position and the axial position of the voltage divider 123, the photomultiplier tube 122 connected to the voltage divider 123, and the scintillation crystal 121 connected to the photomultiplier tube 122. By fixing the detector body 120 through the third fixing portion 13332 and the second fixing portion 132, the fixing effect of the detector body 120 can be improved, and further the shaking of the detector body 120 can be avoided.

[0059] In some embodiments, the second fixing element 1334 may include a buckle. Part of the structure of the buckle may be disposed on the third fixing portion 13332, and another part of the structure may be disposed on the second fixing portion 132. By fastening the two parts of the structure, the connection between the second fixing portion 132 and the third fixing portion 13332 can be realized, and the second fixing portion 132 can be fixed on the fixing rod 1331, so as to realize the fixing of the detector body 120.

[0060] In some embodiments, external threads may be provided on the fixing rod 1331, and the second fixing element 1334 may include a plurality of nuts (for the convenience of description, the nut may be referred to as the second nut) that cooperate with the external threads. Two second nuts may be provided on each fixing rod 1331. One second nut is threadedly connected to the external threads on the fixing rod 1331 on the side of the second fixing portion 132 away from the third fixing portion 13332, and the other second nut is threadedly connected to the external threads on the fixing rod 1331 on the side of the third fixing portion 13332 away from the second fixing portion 132, so as to restrict the radial position and the axial position of the voltage divider 123. In some embodiments, in addition to the second nut, the second fixing element 1334 may further include a spring washer, so as to increase the friction force between the second nut and the voltage divider 123, prevent the second nut from gradually loosening due to vibration, maintain the stability of the connection, and at the same time reduce the vibration received by the voltage divider 123. For example, the spring washer may be disposed on the side of the second fixing portion 132 away from the third fixing portion 13332, and the second nut may be disposed on the side of the spring washer away from the second fixing portion 132. For another example, the spring washer may be disposed on the side of the third fixing portion 13332 away from the second fixing portion 132, and the second nut may be disposed on the side of the spring washer away from the third fixing portion 13332.

[0061] In some embodiments, such as Figure 2As shown, the fixed rod 1331 may include a first rod segment 13311 and a second rod segment 13312. The distance between the first rod segment 13311 and the bottom of the housing 110 is greater than the distance between the second rod segment 13312 and the bottom of the housing 110. The part of the top of the first rod segment 13311 passing through the through hole ( Figure 2 not shown) in the second fixing part 132 is provided with an external thread on its partial structure. The radial dimension of the part of the top of the first rod segment 13311 passing through the through hole in the second fixing part 132 is smaller than the radial dimension of the through hole in the second fixing part 132, and the radial dimension of other structures in the first rod segment 13311 is greater than the radial dimension of the through hole in the second fixing part 132. The part of the bottom of the second rod segment 13312 passing through the through hole ( Figure 2 not shown) in the third fixing part 13332 is hollow and provided with an internal thread. The radial dimension of the part of the bottom of the second rod segment 13312 passing through the through hole in the second fixing part 132 is smaller than the radial dimension of the through hole in the third fixing part 13332, and the radial dimension of other structures in the second rod segment 13312 is greater than the radial dimension of the through hole in the third fixing part 13332. The second fixing element 1334 may include a plurality of nuts (for the convenience of description, this nut may be called the third nut) that cooperate with the external thread at the top of the first rod segment 13311. The top of the first rod segment 13311 passing through the through hole in the second fixing part 132 can be threadedly connected to the third nut to limit the axial position of the second fixing part 132. The external thread at the top of the first rod segment 13311 also threadedly cooperates with the internal thread at the bottom of the second rod segment 13312 to limit the axial position of the third fixing part 13332, so as to realize the limitation of the radial position and the axial position of the voltage divider 123.

[0062] In some embodiments, a shielding layer may be provided on the sleeve 13331. The aforementioned shielding layer may include a platinum film alloy layer to prevent the photomultiplier tube 122 from being affected by the geomagnetic field, thereby reducing the accuracy of detection.

[0063] The aforementioned shielding layer may further include a polytetrafluoroethylene layer. The properties of polytetrafluoroethylene are stable, which can avoid property changes at high temperatures. In addition, it can also prevent the photomultiplier tube 122 from receiving light sources other than the scintillation crystal 121, reducing the accuracy of detection.

[0064] In some embodiments, the fixed sleeve 1333 does not completely block the photomultiplier tube 122, so that the photomultiplier tube 122 can be in full contact with the scintillation crystal 121 to receive the light emitted by the scintillation crystal 121, ensuring the normal operation of the detector main body 120. As Figure 2As shown, the first dimension L1 is the dimension of the fixed sleeve 1333 along the axial direction of the housing 110, and the second dimension L2 is the dimension between the top surface of the second-layer structure 1232 and the top surface of the photomultiplier tube 122. Among them, the difference between the second dimension L2 and the first dimension L1 is 1 to 3 mm. By restricting the difference between the second dimension L2 and the first dimension L1, the contact between the photomultiplier tube 122 and the scintillation crystal 121 can be ensured, and the photomultiplier tube 122 can also be prevented from being affected by excessive geomagnetism, ensuring the accuracy of the detection of the detector body 120.

[0065] The basic concepts have been described above. Obviously, for those skilled in the art, the above detailed disclosure is only an example and does not constitute a limitation to this specification. Although not explicitly stated here, those skilled in the art may make various modifications, improvements, and corrections to this specification. Such modifications, improvements, and corrections are suggested in this specification, so such modifications, improvements, and corrections still fall within the spirit and scope of the exemplary embodiments of this specification.

[0066] Meanwhile, this specification uses specific terms to describe the embodiments of this specification. Such as "one embodiment", "an embodiment", and / or "some embodiments" mean a certain feature, structure, or characteristic related to at least one embodiment of this specification. Therefore, it should be emphasized and noted that the "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more at different positions in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of this specification can be appropriately combined.

[0067] In addition, unless clearly stated in the claims, the order of the processing elements and sequences, the use of numbers and letters, or the use of other names in this specification are not used to limit the order of the processes and methods in this specification. Although some currently considered useful inventive embodiments are discussed through various examples in the above disclosure, it should be understood that such details only serve the purpose of illustration. The appended claims are not limited to the disclosed embodiments. On the contrary, the claims are intended to cover all modifications and equivalent combinations that conform to the essence and scope of the embodiments of this specification. For example, although the system components described above can be implemented by hardware devices, they can also be implemented only through software solutions, such as installing the described system on existing servers or mobile devices.

[0068] Similarly, it should be noted that, in order to simplify the description disclosed in this specification and thus help the understanding of one or more embodiments of the invention, in the foregoing description of the embodiments of this specification, multiple features are sometimes grouped into one embodiment, drawing or description thereof. However, this disclosure method does not mean that the features required by the object of this specification are more than those mentioned in the claims. In fact, the features of the embodiments are fewer than all the features of the individual embodiments disclosed above.

[0069] In some embodiments, numbers are used to describe components and the quantity of attributes. It should be understood that such numbers used for the description of embodiments are modified by the modifiers "about", "approximate" or "substantially" in some examples. Unless otherwise specified, "about", "approximate" or "substantially" indicate that the said numbers allow a variation of ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, and such approximate values may change according to the characteristics required by individual embodiments. In some embodiments, the numerical parameters should consider the specified significant digits and adopt the method of retaining general digits. Although the numerical ranges and parameters used to confirm the breadth of the scope in some embodiments of this specification are approximate values, in specific embodiments, the setting of such numerical values is as precise as possible within the feasible range.

[0070] For each patent, patent application, patent application publication and other materials cited in this specification, such as articles, books, specifications, publications, documents, etc., their entire contents are hereby incorporated into this specification by reference. Except for the application history documents that are inconsistent with or conflict with the content of this specification, and except for the documents that limit the broadest scope of the claims of this specification (currently or subsequently attached to this specification). It should be noted that if there are inconsistencies or conflicts between the descriptions, definitions, and / or uses of terms in the attached materials of this specification and the content described in this specification, the descriptions, definitions, and / or uses of terms in this specification shall prevail.

[0071] Finally, it should be understood that the embodiments described in this specification are only used to illustrate the principles of the embodiments of this specification. Other deformations may also fall within the scope of this specification. Therefore, by way of example and not limitation, alternative configurations of the embodiments of this specification can be considered to be consistent with the teachings of this specification. Accordingly, the embodiments of this specification are not limited to the embodiments clearly introduced and described in this specification.

Claims

1. A detector for exploration wells, characterized in that, Comprising: A housing; A detector body disposed within the housing; A fixing assembly disposed within the housing for fixing the detector body within the housing; And A buffer material filled in the gaps between the housing and the detector body and between the housing and the fixing assembly.

2. The detector for exploration well according to claim 1, wherein The detector body includes a scintillation crystal, a photomultiplier tube, and a voltage divider. One end of the photomultiplier tube is connected to the scintillation crystal, and the other end of the photomultiplier tube is connected to the voltage divider.

3. The detector for exploration well according to claim 2, wherein The fixing assembly includes a first fixing portion, a second fixing portion, and a fixing member. The fixing member is fixedly connected to the housing. The fixing member fixes the first fixing portion and the second fixing portion at different positions along the axial direction of the housing within the housing. Among them, the distance between the first fixing portion and the bottom of the housing is greater than the distance between the second fixing portion and the bottom of the housing. The scintillation crystal, the photomultiplier tube, and the voltage divider are fixed between the first fixing portion and the second fixing portion.

4. The detector for exploration well according to claim 3, wherein The fixing member includes at least three fixing rods and at least three first fixing elements. The at least three fixing rods are arranged in one-to-one correspondence with the at least three first fixing elements. For each fixing rod, one end of the fixing rod is fixed to the bottom of the housing, and the other end of the fixing rod passes through the first fixing portion, the second fixing portion, and is fixedly connected to the first fixing element.

5. The detector for exploration well according to claim 4, characterized in that The outer shell of the voltage divider includes a first layer structure and a second layer structure along the axial direction of the housing. Among them, the distances between the first layer structure and the second layer structure and the bottom of the housing increase in sequence. The radial dimension of the first layer structure is smaller than the radial dimension of the second layer structure. The second fixing portion fixes the outer shell of the voltage divider. The second fixing portion is a hollow structure inside. The second fixing portion is sleeved on the first layer structure. The inner diameter dimension of the second fixing portion is greater than the radial dimension of the first layer structure and smaller than the radial dimension of the second layer structure.

6. The detector for exploration well according to claim 5, wherein, The fixing assembly further includes a fixing sleeve and a second fixing element. The outer shell of the voltage divider further includes a third layer structure. Among them, the distance between the third layer structure and the bottom of the housing is greater than the distance between the second layer structure and the bottom of the housing. The radial dimension of the third layer structure is smaller than the radial dimension of the second layer structure. The fixing sleeve is in an inverted T shape. The fixing sleeve includes a sleeve and a third fixing portion. Among them, the third fixing portion includes an annular hollow. The sleeve is connected to the inner edge of the annular hollow. The sleeve is sleeved on the photomultiplier tube, and the third fixing portion is sleeved on the fixing rod. The third fixing portion is sleeved on the third layer structure. The inner diameter dimension of the third fixing portion is greater than the radial dimension of the third layer structure and smaller than the radial dimension of the second layer structure. The third fixing portion and the second fixing portion are fixedly connected through the second fixing element.

7. The detector for exploration well according to claim 6, wherein, A shielding layer is provided on the sleeve.

8. The detector for exploration well according to claim 6, wherein The first fixing element includes a spring washer and a nut; and / or The second fixing element includes a spring washer and a nut.

9. The detector for exploration well according to claim 6, wherein, The first dimension is the dimension of the fixed sleeve along the axial direction of the housing, and the second dimension is the dimension between the top surface of the second-layer structure and the top surface of the photomultiplier tube, where the difference between the second dimension and the first dimension is 1 to 3 mm.

10. The detector for exploration well according to claim 1, characterized in that, The buffer material includes at least one of epoxy resin and silicone gel.

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