Shaft body assembly and ground well device

Abstract

The utility model discloses a shaft body assembly and a ground well device. The shaft body assembly comprises an outer cylinder body, an inner cylinder body and a scale assembly. And the inner cylinder body is inserted and fixed in the outer cylinder body. The scale assembly comprises a first scale assembly and a second scale assembly. At least one of the first scale assembly and the second scale assembly is provided with a preset scale bar. One end of the first scale assembly is fixed to the edge of the inner side wall of the outer cylinder. The second scale assembly is fixedly arranged on the inner side wall of the inner barrel, so that the first scale assembly or the second scale assembly is aligned with the preset scale bar, and the relative position of the outer barrel and the inner barrel is obtained through reading. According to the shaft body assembly, measurement of the installation precision of the inner cylinder body and the outer cylinder body can be achieved, the installation precision of the shaft body can be detected, the installation precision condition can be known in time, adjustment is conducted in time, and storage of stored objects in the shaft body is guaranteed.

Description

Technical Field

[0001] The present application relates to the field of underground well installation, and in particular to a wellbore assembly and an underground well device. Background Art

[0002] In the aerospace and aviation fuel industry, ground wells are often installed on the ground of aircraft landing pads to protect fuel hydrants, fuse valves, and other valves used for refueling, drainage, and venting. In the related art, existing ground wells of this type often consist of an inner cylinder and an outer cylinder. The outer cylinder is fitted into the concrete surface, while the inner cylinder is nested within the outer cylinder.

[0003] However, during the actual installation process, this type of well structure has certain shortcomings: first, there will be installation deviations between the inner and outer cylinders; second, as the use time increases, the changes in ground temperature cause thermal expansion and contraction between the inner and outer cylinders, resulting in installation deviations between the inner and outer cylinders. The installation deviation is manifested in the inner and outer cylinders being uneven or tilted at different levels, affecting the overall installation stability of the well. At the same time, during the use of the well, due to the loss of part of the groundwater stabilization layer due to the erosion of flowing water, the oil pipeline will be offset, thereby changing the relative position between the inner and outer cylinders. This seriously affects the performance of the valve equipment in the well and can easily cause dangerous incidents such as oil leaks. Summary of the Invention

[0004] The present application provides a wellbore assembly and a well device. The wellbore assembly in the present application can measure the installation accuracy of the inner and outer cylinders, so that the installation accuracy of the wellbore can be detected, facilitating timely detection and adjustment of the installation accuracy to ensure the preservation of stored items in the wellbore.

[0005] The technical solution is as follows:

[0006] According to a first aspect of an embodiment of the present application, a wellbore assembly is provided, comprising an outer barrel, an inner barrel, and a scale assembly.

[0007] The inner cylinder is inserted and fixed in the outer cylinder.

[0008] The scale assembly includes a first scale assembly and a second scale assembly. At least one of the first and second scale assemblies is provided with a preset scale bar. One end of the first scale assembly is secured to the inner sidewall edge of the outer cylinder. The second scale assembly is secured to the inner sidewall of the inner cylinder so that the first or second scale assembly is aligned with the preset scale bar to obtain a reading indicating the relative position of the outer and inner cylinders.

[0009] The technical solutions provided by the embodiments of the present application may have the following beneficial effects:

[0010] The scale bar can be provided in at least one of the axial direction, the circumferential direction, and the mating direction perpendicular to the axis of the wellbore assembly, so that the scale bar can be aligned using the first scale assembly or the second scale assembly to determine the relative position of the inner and outer cylinders in a specific direction, thereby determining the installation accuracy between the inner and outer cylinders in that specific direction. In this way, the installation accuracy between the outer and inner cylinders can be determined, and the installation error can be determined, facilitating manual measurement and improving the installation accuracy of the wellbore assembly.

[0011] The following is a further description of the technical solution:

[0012] In one embodiment, at least one of the first scale assembly and the second scale assembly is provided with a graduated bar. One end of the first scale assembly is secured to the inner sidewall edge of the outer cylinder. The second scale assembly is secured to the inner sidewall of the inner cylinder such that the first scale assembly or the second scale assembly is aligned with the graduated bar to provide a reading indicating the relative position of the outer and inner cylinders.

[0013] In one embodiment, the first scale assembly includes a first rod, a second rod, and a third rod. One end of the third rod is fixed to the inner sidewall edge of the outer cylinder, and the other end is bent and connected to the first rod. The second scale assembly is provided with a first scale bar along the axial direction of the inner cylinder. One end of the second rod is bent and connected to the first rod, and the other end abuts the second scale assembly, so that the relative position of the first and second scale assemblies along the axial direction can be determined by aligning the second rod with the first scale bar.

[0014] In one embodiment, the second rod is provided with a second scale bar. A mating hole is provided at one end of the first rod. The first rod is movably connected to the second rod through the mating hole. The direction of the movable connection between the first and second rods is horizontal. The second scale bar is provided in the horizontal direction. By aligning the first rod with the second scale bar, the relative position of the outer cylinder and the inner cylinder in the horizontal direction can be determined by reading.

[0015] In one embodiment, the outer cylinder includes an outer cylinder body, a first opening, and a first accommodating cavity. The inner cylinder includes an inner cylinder body, a second opening, and a second accommodating cavity. The first opening and the first accommodating cavity are provided in the outer cylinder body, while the second opening and the second accommodating cavity are provided in the inner cylinder body. The inner cylinder body is at least partially inserted into the first accommodating cavity. The first opening, the second opening, and the second accommodating cavity are arranged in communication. One end of the first rod is fixed to the outer cylinder body, which is located at the edge of the first opening.

[0016] In one embodiment, the second scale assembly is provided with a third scale bar. The circumferential direction is defined as the direction of the curve parallel to the second opening. The third scale bar is circumferentially disposed on the inner sidewall of the inner cylinder, such that the second marking rod is aligned with the third scale bar, allowing the relative position of the outer cylinder and the inner cylinder along the circumferential direction to be determined. The horizontal direction and the axial direction are perpendicular to each other. The circumferential direction is perpendicular to both the axial direction and the horizontal direction.

[0017] In one embodiment, the second scale assembly is provided with at least two third scale bars spaced apart from each other, and the third scale bars are arranged perpendicular to the first scale bars.

[0018] In one embodiment, the second scale assembly is provided with a first groove along the axial direction. A first scale bar is disposed at the edge of the first groove. A first sliding portion is provided at one end of the second scale rod. The first sliding portion is slidably engaged with the first groove along the axial direction, so that the second scale rod and the second scale assembly are aligned and a reading is obtained to determine the relative position of the inner and outer cylinders along the axial direction.

[0019] In one embodiment, the second scale assembly is provided with at least two second grooves along the circumferential direction. The third scale bars are disposed in a one-to-one correspondence with the edges of the second grooves. A second sliding portion is provided at one end of the second rod. The second sliding portion engages with the second grooves in a limited sliding manner, so that the second rod and the second scale assembly are aligned and a reading is obtained to determine the relative position of the inner and outer cylinders along the circumferential direction.

[0020] According to a second aspect of an embodiment of the present application, a well device is provided, comprising a well cover body and the wellbore assembly of the above embodiment, wherein the well cover body and the wellbore assembly are fitted together.

[0021] The technical solutions provided by the embodiments of the present application may have the following beneficial effects:

[0022] By disposing the wellbore assembly in the above-mentioned embodiment, the measurement accuracy of the installation precision of the underground well device can be improved, manual measurement and timely adjustment are facilitated, and the installation and use performance of the underground well device is improved.

[0023] The following is a further description of the technical solution:

[0024] In one embodiment, one of the sidewalls of the manhole cover body and the inner cylinder is provided with a sliding groove, and the other is provided with a mating portion. The mating portion and the sliding groove are limitedly slidably engaged, so that the manhole cover body and the outer cylinder are mated, and the upper surface of the manhole cover body is flush with the upper surface of the outer cylinder.

[0025] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0027] Figure 1 Schematic diagram of the structure of a well device in one embodiment.

[0028] Figure 2 for Figure 1 Schematic diagram of the structure of the wellbore assembly shown in .

[0029] Figure 3 for Figure 2 Schematic diagram of the matching structure of the inner cylinder and the scale assembly shown in .

[0030] Figure 4 It is a cross-sectional view of the cooperation between the inner cylinder and the outer cylinder in one embodiment.

[0031] Figure 5 It is a cross-sectional view of the cooperation between the inner cylinder and the outer cylinder in another embodiment.

[0032] Figure 6 Schematic diagram of the structure of the scale assembly and the slide in one embodiment.

[0033] Figure 7 for Figure 6 Schematic diagram of the structure of the ruler component shown in.

[0034] Figure 8 for Figure 7 Schematic diagram of the structure of the second ruler component shown in . Description of the drawings:

[0036] 10. Underground well device; 100. Wellbore assembly; 110. Outer cylinder; 120. Inner cylinder; 121. Matching part; 130. Scale assembly; 131. First scale assembly; 1311. First marker rod; 1311a. Matching hole; 1312. Second marker rod; 1312a. Second scale bar; 1313. Third marker rod; 132. Second scale assembly; 1321. First scale bar; 1322. Third scale bar; 1323. First groove; 1324. Second groove; 200. Well cover body; 210. Slide groove. DETAILED DESCRIPTION

[0037] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0038] In the field of aerospace and aviation fuel, double-barrel ground wells are often installed on the apron. Due to changes in ground temperature, the inner and outer barrels of the ground well often experience changes in thermal expansion and contraction, which in turn causes displacement between the inner and outer barrels, resulting in changes in the matching height, tilt angle, etc. If not corrected in time, there will be a risk of leakage of the aviation fuel stored in the ground well, posing a major safety hazard.

[0039] However, in the related art, there is still no more accurate measurement method for measuring the installation accuracy between the inner tube and the outer tube of the underground well. It can only rely solely on visual inspection by human eyes, which has poor accuracy.

[0040] Based on this, the present application provides a well device 10, such as Figure 1 As shown, it includes a wellbore assembly 100 and a well cover body 200. The well cover body 200 is matched with the wellbore assembly 100.

[0041] Specifically, combined Figures 2 to 5 As shown, the wellbore assembly 100 includes an outer cylinder 110, an inner cylinder 120 and a scale assembly 130. The inner cylinder 120 is inserted and fixed in the outer cylinder 110. The scale assembly 130 includes a first scale assembly 131 and a second scale assembly 132. At least one of the first scale assembly 131 and the second scale assembly 132 is provided with a preset scale bar. One end of the first scale assembly 131 is fixed to the edge of the inner side wall of the outer cylinder 110. The second scale assembly 132 is fixed to the inner side wall of the inner cylinder 120, so that the first scale assembly 131 is aligned with the preset scale bar of the second scale assembly or the second scale assembly 132 is aligned with the preset scale bar of the first scale assembly, so as to read the relative position of the outer cylinder 110 and the inner cylinder 120.

[0042] It is understood that the scale bar can be provided in at least one of the axial direction X, the circumferential direction Z, and the horizontal direction Y perpendicular to the axis of the wellbore assembly 100. This allows alignment of the scale bar with the corresponding first scale assembly 131 or second scale assembly 132, thereby determining the relative position of the inner cylinder 120 and the outer cylinder 110 in a specific direction and the installation accuracy of the inner cylinder 120 and the outer cylinder 110 in that specific direction. In this way, the installation accuracy between the outer cylinder 110 and the inner cylinder 120 can be determined, and the installation error can be determined, facilitating manual measurement and improving the installation accuracy of the wellbore assembly 100. In this way, operators can regularly measure the fit between the inner cylinder 120 and the outer cylinder 110 using the wellbore assembly in the above-described embodiment, and promptly measure and adjust installation errors, thereby ensuring underground well storage performance, preventing leakage of stored items such as aviation fuel, and eliminating safety hazards.

[0043] In a specific embodiment, Figures 3 to 5 As shown, the scale bar can be set in the axial direction X of the wellbore assembly 100. Specifically, the first scale assembly 131 includes a first mark rod 1311, a second mark rod 1312, and a third mark rod 1313. One end of the third mark rod 1313 is fixed to the inner side wall edge of the outer cylinder 110, and the other end is bent and connected to the first mark rod 1311. The second scale assembly 132 is provided with a first scale bar 1321 along the axial direction X of the inner cylinder 120. One end of the second mark rod 1312 is bent and connected to the first mark rod 1311, and the other end abuts the second scale assembly 132, so that the relative position of the first scale assembly 131 and the second scale assembly 132 along the axial direction X can be obtained by aligning the second mark rod 1312 with the first scale bar 1321.

[0044] It is understood that one end of the first marking rod 1311 is engaged with the outer edge of the outer cylinder 110, which can be done by plug-in or welding, so that the position of the outer cylinder 110 along the axial direction X can be calibrated by the first marking rod 1311. Furthermore, the first scale bar 1321 is provided on the inner side wall of the inner cylinder 120 along the axial direction X, so that the first marking rod 1311 and the first scale bar 1321 can be aligned for reading. Furthermore, the provision of the second marking rod 1312 allows the first marking rod 1311 to be used as a guide reference when aligning the first marking rod 1311 with the first scale bar 1321, with the point where the second marking rod 1312 abuts the first scale bar 1321 serving as the alignment point, thereby improving the accuracy of the reading. Thus, the installation accuracy is determined by the alignment of the second marking rod 1312 with the first scale bar 1321. Assuming that the normal height difference between the inner cylinder 120 and the outer cylinder 110 during installation along the axial direction X is 0-10 mm, if the contact point between the second marking rod 1312 and the first scale bar 1321 is measured at 20 mm, it indicates that the inner cylinder 120 may have sunken downward and requires manual adjustment.

[0045] It should be noted that there can be multiple size standards for the first scale bar 1321 , which can be selected based on the size between the inner cylinder 120 and the outer cylinder 110 , and no excessive restrictions are imposed here.

[0046] In one example, the range of the first scale bar 1321 is 0 mm to 100 mm, and the first scale bar 1321 uses 10 mm as a scale unit.

[0047] In combination with any of the above embodiments of the second benchmark 1312, as Figure 6As shown, the second marking rod 1312 is provided with a second scale bar 1312a. A mating hole 1311a is provided at one end of the first marking rod 1311. The first marking rod 1311 is movably plugged into the second marking rod 1312 through the mating hole 1311a. The direction of the movably plugged connection between the first marking rod 1311 and the second marking rod 1312 is the horizontal direction Y. The second scale bar 1312a is provided along the horizontal direction Y. By aligning the first marking rod 1311 with the second scale bar 1312a, the relative position of the outer cylinder 110 and the inner cylinder 120 along the horizontal direction Y can be obtained by reading. It can be understood that the second scale bar 1312a is provided along the horizontal direction Y so that it can be determined whether the spacing between the inner cylinder 120 and the outer cylinder 110 when they are mated meets the installation accuracy. Specifically, the first mark rod 1311 is fixed to the edge of the outer cylinder 110, so that the first mark rod 1311 can serve as an installation scale for the outer cylinder 110 along the horizontal direction Y. At this time, one end of the second mark rod 1312 abuts against the first scale bar 1321, so that the second mark rod 1312 can serve as an installation scale for the inner cylinder 120 along the horizontal direction Y. At this time, the first mark rod 1311 can be movably plugged into the second mark rod 1312 along the horizontal direction Y to obtain the reading of the second scale bar 1312a of the first mark rod 1311 on the second mark rod 1312, thereby obtaining the fitting distance between the inner cylinder 120 and the outer cylinder 110, matching it with the standard distance, and thus determining whether it meets the installation accuracy standard.

[0048] It should be noted that the horizontal direction Y and the axial direction X can be perpendicular, or bent at other angles, and no further restrictions are imposed herein.

[0049] In one example, the distance from a first point on the axis of the inner cylinder 120 to a second point on the axis of the outer cylinder 110 is horizontal direction Y, such that horizontal direction Y is perpendicular to axial direction X, and the first and second points are co-located. In this way, the alignment reading between the first marking rod 1311 and the second scale bar 1312a directly reflects the fitting distance between the inner cylinder 120 and the outer cylinder 110, reducing reading errors caused by angular deviation and improving the measurement accuracy of the installation of the inner cylinder 120 and the outer cylinder 110.

[0050] Specifically, in combination with any embodiment of the wellbore assembly 100, see Figures 2 to 3 As shown, the outer cylinder 110 includes an outer cylinder body, a first opening, and a first accommodating cavity. The inner cylinder 120 includes an inner cylinder body, a second opening, and a second accommodating cavity. The first opening and the first accommodating cavity are provided on the outer cylinder body, while the second opening and the second accommodating cavity are provided on the inner cylinder body. The inner cylinder body is at least partially inserted into the first accommodating cavity. The first opening, the second opening, and the second accommodating cavity are arranged in communication. One end of the first rod 1311 is fixed to the outer cylinder body, which is located at the edge of the first opening.

[0051] In one specific embodiment, Figures 6 to 7 As shown, the second scale assembly 132 is provided with a third scale bar 1322. The direction of the curve parallel to the second opening is the circumferential direction Z. The third scale bar 1322 is arranged on the inner sidewall of the inner cylinder 120 along the circumferential direction Z, so that the second mark rod 1312 is aligned with the third scale bar 1322, and the relative position of the outer cylinder 110 and the inner cylinder 120 along the circumferential direction Z is obtained by reading. The horizontal direction Y and the axial direction X are arranged perpendicular to each other. The circumferential direction Z is arranged perpendicular to the axial direction X and the horizontal direction Y. It can be understood that the third scale bar 1322 is set on the inner wall of the inner cylinder 120 along the circumferential direction Z, and the first mark rod 1311 is aligned with the third scale bar 1322 through the second mark rod 1312 for reading, so that the relative position of the inner cylinder 120 relative to the outer cylinder 110 in the circumferential direction Z can be obtained, that is, the rotation angle of the inner cylinder 120 relative to the outer cylinder 110. The reading can be used to determine whether there is a deviation in the installation angle between the inner cylinder 120 and the outer cylinder 110.

[0052] It should be noted that there may be various size standards for the second scale bar 1312a and the third scale bar 1322, which may be selected according to the size between the inner cylinder 120 and the outer cylinder 110, and no excessive restrictions are imposed herein.

[0053] In a specific embodiment, the second scale bar 1312a ranges from 0 mm to 100 mm, and the second scale bar 1312a uses 10 mm as a scale unit.

[0054] In one example, the range of the third scale bar 1322 is from -100 mm to 100 mm, and the third scale bar 1322 has a scale unit of 10 mm or 15 mm.

[0055] In another example, the range of the third scale bar 1322 is between -60° and 60°, and the third scale bar 1322 has a scale unit of 10° or 15°.

[0056] It should be noted that the third scale bars 1322 can be arranged continuously or at intervals in the circumferential direction Z, and no further restrictions are imposed here.

[0057] In one embodiment, the third scale bar 1322 is annularly arranged to form a third scale ring. The third scale ring is arranged parallel to the second opening. This improves the convenience of detecting the relative position of the inner cylinder 120 with respect to the outer cylinder 110 in the circumferential direction Z, eliminating the need for dedicated alignment and improving detection efficiency.

[0058] Similarly, in one example, the first scale bar 1321 can be arranged along the axial direction X to cover the entire second accommodating cavity. And / or, the second scale bar 1312a can be arranged along the horizontal direction Y to cover the second mark rod 1312. In this way, by increasing the range of the scale bar, the measurement accuracy can be improved.

[0059] In another specific embodiment, the second scale assembly 132 is provided with at least two spaced-apart third scale bars 1322. The third scale bars 1322 are arranged perpendicular to the first scale bars 1321. The provision of at least two third scale bars 1322 reduces the difficulty of aligning the inner cylinder 120 and the outer cylinder 110 for reading, broadens the alignment scenarios, and facilitates reading operations.

[0060] Similarly, in another example, at least two second scale bars 1312a are spaced apart along the horizontal direction Y, so that readings can be aligned in different ranges, thereby improving the adaptability of readings.

[0061] In order to improve the movement stability of the second marker 1312, as Figure 8 As shown, in conjunction with any of the above-described embodiments of the first scale assembly 131, the second scale assembly 132 is provided with a first groove 1323 along the axial direction X. A first scale bar 1321 is disposed at the edge of the first groove 1323. A first sliding portion is provided at one end of the second scale rod 1312. The first sliding portion slidably engages with the first groove 1323 along the axial direction X, aligning the second scale rod 1312 with the second scale assembly 132 for reading, thereby determining the relative positions of the inner cylinder 120 and the outer cylinder 110 along the axial direction X. It will be appreciated that the slidably engageable engagement of the first sliding portion with the first groove 1323 allows the first groove 1323 to serve as an alignment point for the second scale rod 1312 when the inner cylinder 120 and the outer cylinder 110 are mated. This allows the second scale rod 1312 to be read only when it is perpendicular to the inner wall of the inner cylinder 120, thereby improving reading accuracy. At the same time, the limiting function of the first sliding portion and the first groove 1323 can provide a positioning and limiting function for the first sliding portion, which is beneficial to improving the positioning stability of the second mark rod 1312 and further facilitating stable readings.

[0062] In combination with any of the above embodiments of the second scale assembly 132, see the attached Figure 8The second scale assembly 132 is provided with at least two second grooves 1324 along the circumferential direction Z. The third scale bars 1322 are disposed in a one-to-one correspondence on the edges of the second grooves 1324. A second sliding portion is provided at one end of the second marking rod 1312. The second sliding portion engages with the second grooves 1324 in a limited sliding manner, allowing the second marking rod 1312 to align with the second scale assembly 132 for reading, thereby determining the relative positions of the inner cylinder 120 and the outer cylinder 110 along the circumferential direction Z. It will be appreciated that, similarly, the limited sliding engagement of the second sliding portion with the second grooves 1324 provides space for movement when aligning the inner cylinder 120 and the outer cylinder 110 for reading, allowing one end of the second marking rod 1312 to align flush with the third scale bar 1322 for accurate readings. Furthermore, the limited position allows the second marking rod 1312 to be stably positioned in the second grooves 1324, thereby securing the second marking rod 1312 and improving reading stability.

[0063] In combination with any embodiment of the above-mentioned manhole cover body 200, Figure 1 、 Figure 3 as well as Figure 6 As shown, one of the sidewalls of the manhole cover body 200 and the inner cylinder 120 is provided with a chute 210, and the other is provided with a mating portion 121. The mating portion 121 and the chute 210 are slidably engaged with each other, allowing the manhole cover body 200 to cover and engage with the outer cylinder 110, and the upper surface of the manhole cover body 200 is flush with the upper surface of the outer cylinder 110. It is understood that, generally, in the field of aerospace and aviation fuel, it is necessary to reduce a certain amount of impact resistance when the manhole cover body 200 and the outer cylinder 110 are engaged to avoid the risk of damage to the aviation fuel stored in the well in the event of an excessive impact. Based on this, the sliding engagement of the chute 210 and the mating portion 121 allows the manhole cover body 200 to be limited in position, and the friction resistance during the sliding engagement between the chute 210 and the mating portion 121 reduces the impact of the manhole cover body 200 on the wellbore assembly 100, thereby improving the stability of the installation.

[0064] Specifically, in one embodiment, Figure 6 As shown, the matching portion 121 includes a first fixed rod and a first protrusion (ie Figure 6 The first fixed rod is threadedly engaged with the nut in the well assembly. The two ends of the first fixed rod are supported relative to each other on the inner sidewall of the inner cylinder 120. The well assembly 10 also includes a first body, which is fixedly engaged with the manhole cover body 200. The first body is provided with a groove extending in the axial direction X, which slidably engages with the first protrusion.

[0065] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application. The technical content disclosed above can be used to make slight changes or modifications to equivalent implementation methods with equivalent changes. However, any simple modifications, equivalent changes and modifications made to the above implementation methods based on the technical essence of the present application that do not deviate from the content of the technical solution of the present application are still within the scope of the technical solution of the present application.

Claims

1. A wellbore assembly, characterized in that: include: outer cylinder; inner cylinder; The inner cylinder is inserted and fixed in the outer cylinder; The scale assembly includes a first scale assembly and a second scale assembly; at least one of the first scale assembly and the second scale assembly is provided with a preset scale bar; one end of the first scale assembly is fixed to the edge of the inner side wall of the outer cylinder; the second scale assembly is fixed to the inner side wall of the inner cylinder, so that the first scale assembly or the second scale assembly is aligned with the preset scale bar to read the relative position of the outer cylinder and the inner cylinder.

2. The wellbore assembly according to claim 1, characterized in that: The first scale assembly includes a first mark rod, a second mark rod and a third mark rod; one end of the third mark rod is fixed to the inner side wall edge of the outer cylinder, and the other end is fixedly connected to the first mark rod; the second scale assembly is provided with a first scale bar along the axial direction of the inner cylinder; one end of the second mark rod is plug-connected to the first mark rod, and the other end abuts against the second scale assembly, so that the relative position of the first scale assembly and the second scale assembly along the axial direction is obtained by aligning the second mark rod with the first scale bar.

3. The wellbore assembly according to claim 2, characterized in that: The second marker is provided with a second scale bar; a matching hole is provided at one end of the first marker; the first marker is movably plugged into the second marker through the matching hole; the direction of the movably plugging connection between the first marker and the second marker is the horizontal direction; the second scale bar is arranged along the horizontal direction; wherein, by aligning the first marker with the second scale bar, the relative position of the outer cylinder and the inner cylinder along the horizontal direction is obtained by reading.

4. The wellbore assembly according to claim 3, characterized in that: The outer cylinder includes an outer cylinder body, a first opening and a first accommodating cavity; the inner cylinder includes an inner cylinder body, a second opening and a second accommodating cavity; the first opening and the first accommodating cavity are arranged on the outer cylinder body, and the second opening and the second accommodating cavity are arranged on the inner cylinder body; the inner cylinder body is at least partially inserted into the first accommodating cavity; the first opening, the second opening and the second accommodating cavity are arranged in communication; one end of the first mark rod is fixed to the outer cylinder body arranged at the edge of the first opening.

5. The wellbore assembly according to claim 4, characterized in that: The second scale assembly is provided with a third scale bar; the third scale bar is arranged on the inner side wall of the inner cylinder along the circumferential direction on the second opening, so that the second mark rod is aligned with the third scale bar, and the relative position of the outer cylinder and the inner cylinder along the circumferential direction is obtained by reading; wherein, the horizontal direction and the axial direction are arranged perpendicular to each other; the circumferential direction, the axial direction and the horizontal direction are arranged perpendicular to each other.

6. The wellbore assembly according to claim 5, characterized in that: The second scale assembly is provided with at least two third scale bars arranged at intervals; the third scale bars are arranged perpendicular to the first scale bars.

7. The wellbore assembly according to claim 6, characterized in that: The second scale assembly is provided with a first groove along the axial direction; the first scale bar is arranged at the edge of the first groove; a first sliding portion is provided at one end of the second mark rod; the first sliding portion is limitedly slidably engaged with the first groove along the axial direction, so that the second mark rod and the second scale assembly are aligned and read to obtain the relative position of the inner cylinder and the outer cylinder along the axial direction.

8. The wellbore assembly according to claim 7, characterized in that: The second scale assembly is provided with at least two second grooves along the circumferential direction; the third scale bars are arranged in a one-to-one correspondence at the edges of the second grooves; a second sliding portion is provided at one end of the second mark rod; the second sliding portion is engaged in a limited sliding manner with the second groove, so that the second mark rod and the second scale assembly are aligned to obtain the relative positions of the inner cylinder and the outer cylinder along the circumferential direction.

9. A well device, characterized in that: It comprises a manhole cover body and the shaft body assembly according to any one of claims 1 to 8, wherein the manhole cover body is fitted with the shaft body assembly.

10. The underground well device according to claim 9, characterized in that: One of the side walls of the manhole cover body and the inner cylinder is provided with a sliding groove, and the other is provided with a matching portion; the matching portion and the sliding groove are limited and slidably matched, so that the manhole cover body and the outer cylinder are covered and matched, and the upper surface of the manhole cover body is flush with the upper surface of the outer cylinder.

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