A petroleum drilling casing ground gauging device

Abstract

The utility model discloses a kind of petroleum drilling casing ground caliper device, including walking frame, caliper disc, walking support device, the caliper disc is sleeved in the outer periphery of walking frame, the caliper disc is detachably connected with walking frame;The walking support device includes V-shaped adjustable wheel frame, the common end of V-shaped adjustable wheel frame is rotatably connected with walking frame, and the two movable end of V-shaped adjustable wheel frame is provided with driving wheel, and the walking frame is provided with at least two non-overlapping walking support devices.The utility model sets up multiple walking support devices distributed in casing inner wall, increases the support contact area, improves the stability of device walking in casing, guarantees the stability of caliper detection process, and is beneficial to improve detection accuracy.

Description

Technical Field

[0001] This utility model relates to the field of well tool technology, specifically to a surface diameter measuring device for oil drilling casing. Background Technology

[0002] According to the API standard "API-SPECIFICATION 5CT 9th Edition" for casing and tubing, the national standard GB / T20656-2006 "Field Inspection of New Casing, Tubing and Flat-End Drill Pipe in the Oil and Gas Industry" and the petroleum industry standard SY / T5396-2012 "Field Inspection, Transportation and Storage of Oil Casing", oil casing must undergo field gauging before being run into the well. This means that before running the casing into the well, a standard-specified gauge must be passed through the inside of the casing to check for deformation or foreign objects, in order to detect whether the casing body is deformed and whether there are foreign objects blocking the casing, so as to ensure the quality of the casing run into the well. The typical on-site gauging operation is as follows: First, a thin steel wire rope is connected to the front of a simple dumbbell-shaped gauging gauge. One person first passes the wire rope through the casing, and then another person pulls the wire rope at the other end of the casing, using the wire rope to pull the gauging gauge through the casing. Second, compressed air is used as the air source. The simple dumbbell-shaped gauging gauge is placed into the casing, and pneumatic power is used to push the gauge to move and gaug. Third, a thin iron pipe is connected to the back of the simple dumbbell-shaped gauging gauge. The thin iron pipe is used to push the gauge through the casing, and then the gauge must be pulled back along the same path. The thin iron pipe must be longer than the casing. The first and third gauging methods have low automation, are time-consuming and labor-intensive, have high labor intensity, and low efficiency. The second method has significant safety hazards; in 2016, an operator injury accident occurred in an oil field.

[0003] Announcement No. CN222733498U discloses an oil casing bore gauge, comprising a gauge body, a base plate mounted on the lower end of the gauge body, and a plastic bore ring sleeved on the outside of the gauge body. A fixing ring is sleeved on the outside of the gauge body above the plastic bore ring. A positioning mechanism is provided inside the gauge body, the positioning mechanism including a rotating rod, a ratchet sleeved on the outside of the rotating rod, and an adjustment mechanism provided on the rear side of the ratchet. This invention, by incorporating a plastic bore ring, prevents damage to the inner wall of the oil casing during bore testing. Clockwise rotation of the rotating rod in the positioning mechanism moves two racks, thereby moving a positioning plate to the outside of the gauge body and pressing against the fixing ring, thus fixing the plastic bore ring. Counterclockwise rotation of the rotating rod retracts the positioning plate into the gauge body, facilitating the installation and removal of the plastic bore ring.

[0004] The existing technology is time-consuming, labor-intensive, and inefficient.

[0005] Publication No. CN118999313A discloses a self-propelled gauging gauge for ground oil casing, comprising an outer shell, a first gauging testing mechanism, and a second gauging testing mechanism. The outer shell includes a first end and a second end. The first gauging testing mechanism includes a first sleeve, a first fixing plate, a first sector-shaped sliding plate, a first telescopic component, a first locking plate, a first connecting ring, a first spring, a first push rod, and a first pull rope. The first traveling frame is fixed to the first end of the outer shell.

[0006] The existing technology has a fixed drive wheel position, which causes the drive wheel to fail to contact the casing wall during installation.

[0007] Announcement No. CN212843390U discloses a casing gauging device, including a gauging disc, a body, and a wireless remote control power drive assembly. The wireless remote control power drive assembly includes a traveling wheel, which is an omnidirectional wheel. Two omnidirectional wheels are provided and are respectively installed at the front and rear ends of the body.

[0008] The existing technology uses Mecanum wheels, which have very strict requirements for the running surface, and their application in casing bores results in problems with normal operation.

[0009] In summary, the technical solutions, technical problems to be solved, and beneficial effects of the above-disclosed technologies are all different from those of this utility model. For more technical features, technical problems to be solved, and beneficial effects of this utility model, the above-disclosed technical documents do not provide any technical inspiration. Utility Model Content

[0010] In order to overcome the shortcomings of the prior art and solve at least one of the technical problems mentioned in the background art, this utility model provides a surface diameter device for oil drilling casing.

[0011] To achieve the above objectives, the present invention adopts the following technical solution:

[0012] A surface gauging device for oil drilling casing includes a traveling frame, a gauging disc, and traveling support devices. The gauging disc is sleeved on the outer periphery of the traveling frame and is detachably connected to the traveling frame. The traveling support device includes a V-shaped adjustable wheel frame, the common end of which is rotatably connected to the traveling frame. Drive wheels are provided at the two movable ends of the V-shaped adjustable wheel frame. The traveling frame is provided with at least two non-overlapping traveling support devices.

[0013] Furthermore, the V-shaped adjustable wheel frame includes a first tensioning support arm and a second tensioning support arm;

[0014] Specifically, the first tensioning support arm and the second tensioning support arm are rotatably connected by a rotating shaft, and the rotating shaft is rotatably connected to the walking frame;

[0015] Specifically, an adjustment device is provided between the first tensioning support arm and the second tensioning support arm to adjust the tension of the first tensioning support arm and the second tensioning support arm;

[0016] Specifically, a drive wheel is provided at one end of the first tensioning support arm away from the rotating shaft and at one end of the second tensioning support arm away from the rotating shaft, or a drive wheel is provided at one end of the first tensioning support arm away from the rotating shaft and at the other end of the second tensioning support arm away from the rotating shaft, and a driven support wheel is provided at the other end.

[0017] Furthermore, the first tensioning support arm and the second tensioning support arm have the same structure, which is H-shaped, including a lower fork plate and a lower connecting plate;

[0018] Specifically, the drive wheel is disposed between the first fork and the second fork, and the wheel surface of the drive wheel protrudes from the first fork and the second fork;

[0019] Specifically, the first tensioning support arm and the second tensioning support arm are arranged opposite to each other so that the two drive wheels are located on the same plane;

[0020] Specifically, an adjustment device is provided between the first connecting plate of the first tensioning support arm and the second connecting plate of the second tensioning support arm.

[0021] Furthermore, the adjusting device includes a sleeve rod and a straight rod;

[0022] Specifically, the straight rod is slidably inserted into the sleeve rod, and the end of the sleeve rod away from the straight rod is rotatably connected to the first tensioning support arm or the second tensioning support arm. The end of the straight rod away from the sleeve rod is rotatably connected to the second tensioning support arm or the first tensioning support arm.

[0023] Specifically, the outer wall of the sleeve is threaded with a first adjusting nut, the outer wall of the straight rod is threaded with a second adjusting nut, and a spring is provided between the first adjusting nut and the second adjusting nut.

[0024] Furthermore, the walking frame includes a first frame plate and a second frame plate;

[0025] Specifically, the first and second frame plates are connected by support columns, and a walking support device is rotatably connected between the first and second frame plates;

[0026] Specifically, the first and second frame plates have anti-interference holes, and the first or second frame plate has an inward U-shaped connecting seat at the anti-interference hole. The U-shaped connecting seat is rotatably connected to another walking support device, and at least one anti-interference hole and U-shaped connecting seat are provided.

[0027] Furthermore, the guide plate is a circular ring, and the inner ring of the guide plate is provided with two opposing first fixing plates. The first support plate and the second support plate are provided with outwardly extending second fixing plates, and the first fixing plates and the second fixing plates are connected by bolts and nuts.

[0028] Furthermore, a first positioning sleeve is fitted between the first connecting plate and the second connecting plate; a second positioning sleeve is provided between the rotating shaft and the traveling support device and the traveling frame.

[0029] Furthermore, the connecting plate in the first tensioning support arm and the second tensioning support arm is located between the first fork plate and the second fork plate.

[0030] Furthermore, two mutually perpendicular walking support devices are provided, with guide plates at both ends of the walking frame, and the walking support devices are positioned between the two guide plates.

[0031] Furthermore, the drive wheel is a hub motor, the walking frame is equipped with a driver, the hub motor's cable is connected to the driver, and the driver is equipped with a drive power supply.

[0032] Compared with the prior art, the present invention has the following advantages:

[0033] 1. The walking support device of this utility model is arranged in a cross shape on the inner wall of the sleeve, which increases the support contact area, improves the stability of the device walking in the sleeve, ensures a smooth flow test process, and helps to improve the accuracy of the test.

[0034] 2. The adjustment device of this utility model can flexibly adjust the angle and tension of the tension support arm through the cooperation of the nut and the spring, and adapt to sleeves with different inner diameters, thus solving the problem of poor adaptability of existing devices and improving the versatility of the device.

[0035] 3. The caliper disc of this utility model is detachable and replaceable, and can be quickly replaced according to the actual sleeve size. It is easy to operate and further enhances the adaptability of the device to different working scenarios. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure of a surface diameter device for oil drilling casing according to this utility model.

[0037] Figure 2 This is a schematic diagram of the tensioning support arm in this utility model.

[0038] Figure 3 This is a schematic diagram of the walking support device in this utility model.

[0039] Figure 4 This is a schematic diagram of the adjusting device in this utility model.

[0040] Figure 5 This is a schematic diagram of the structure of the walking frame and the guide plate in this utility model.

[0041] In the figure: walking frame 1, first frame plate 11, second frame plate 12, anti-interference hole 13, U-shaped connecting seat 14, second fixing plate 15, support column 16;

[0042] 2. Valves; 21. First fixing plate;

[0043] Walking support device 3, V-shaped adjustable wheel frame 31, first tension support arm 311, second tension support arm 312, first fork plate 313, second fork plate 314, connecting plate 315, first connecting plate 316, second connecting plate 317, first positioning sleeve 318, rotating shaft 319;

[0044] Drive wheel 32; adjusting device 33, sleeve rod 331, straight rod 332, first adjusting nut 333, second adjusting nut 334, spring 335;

[0045] 4. Sleeve; 5. Driver; 6. Power supply. Detailed Implementation

[0046] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0047] Example 1:

[0048] Please see Figures 1 to 5 This utility model provides a surface gauging device for oil drilling casing, including a traveling frame 1, a gauging disc 2, and a traveling support device 3. The gauging disc 2 is sleeved on the outer periphery of the traveling frame 1 and is detachably connected to the traveling frame 1. The traveling support device 3 includes a V-shaped adjustable wheel frame 31, the common end of which is rotatably connected to the traveling frame 1. The two movable ends of the V-shaped adjustable wheel frame 31 are provided with drive wheels 32. The traveling frame 1 is provided with at least two non-overlapping traveling support devices 3.

[0049] Furthermore, the V-shaped adjustable wheel frame 31 includes a first tensioning support arm 311 and a second tensioning support arm 312. The first tensioning support arm 311 and the second tensioning support arm 312 are rotatably connected by a rotating shaft 319. The rotating shaft 319 is rotatably connected to the walking frame 1. A drive wheel 32 is provided at the end of the first tensioning support arm 311 away from the rotating shaft 319 and at the end of the second tensioning support arm 312 away from the rotating shaft 319. An adjustment device 33 is provided between the first tensioning support arm 311 and the second tensioning support arm 312 to adjust the tension of the first tensioning support arm 311 and the second tensioning support arm 312.

[0050] In another embodiment, a drive wheel 32 is provided at one end of the first tensioning support arm 311 away from the rotating shaft 319 and at the other end of the second tensioning support arm 312 away from the rotating shaft 319, and a driven support wheel is provided at the other end.

[0051] Furthermore, the first tensioning support arm 311 and the second tensioning support arm 312 have the same structure, which is H-shaped, including a lower first fork plate 313 and a second fork plate 314, and an upper connecting plate 315. The drive wheel 32 is disposed between the first fork plate 313 and the second fork plate 314, and the wheel surface of the drive wheel 32 is exposed above the first fork plate 313 and the second fork plate 314. The first tensioning support arm 311 and the second tensioning support arm 312 are arranged opposite to each other so that the two drive wheels 32 are located on the same plane. An adjustment device 33 is disposed between the first connecting plate 316 of the first tensioning support arm 311 and the second connecting plate 317 of the second tensioning support arm 312.

[0052] Specifically, the rotating shaft 319 is fitted with a first positioning sleeve 318 between the first connecting plate 316 and the second connecting plate 317 to prevent the first tensioning support arm 311 and the second tensioning support arm 312 from moving axially.

[0053] Further, the adjusting device 33 includes a sleeve rod 331 and a straight rod 332. The straight rod 332 is slidably inserted into the sleeve rod 331. The end of the sleeve rod 331 away from the straight rod 332 is rotatably connected to the first tensioning support arm 311 or the second tensioning support arm 312. The end of the straight rod 332 away from the sleeve rod 331 is rotatably connected to the second tensioning support arm 312 or the first tensioning support arm 311. The outer wall of the sleeve rod 331 is threadedly connected to the first adjusting nut 333. The outer wall of the straight rod 332 is connected to the second adjusting nut 334. A spring 335 is provided between the first adjusting nut 333 and the second adjusting nut 334. By adjusting the position of the first adjusting nut 333 and the second adjusting nut 334, the angle stroke of the V-shaped adjustable wheel frame 31 compressing the spring 335 is changed, so as to form the same tension force in the sleeve 4 with different diameters, adapting to sleeves 4 with different inner diameters. The spring 335 plays a role in softly adjusting the inner diameter, ensuring that the drive wheel 32 fits the inner wall of the sleeve 4.

[0054] Specifically, the connecting plate 315 in the first tensioning support arm 311 and the second tensioning support arm 312 is located between the first fork plate 313 and the second fork plate 314, which reduces the distance between the first connecting plate 316 and the second connecting plate 317, and reduces the length of the rotating connecting piece between the adjusting device 33 and the first tensioning support arm 311 and the second tensioning support arm 312, thereby improving stability.

[0055] Specifically, the sleeve rod 331 is rotatably connected to the first tensioning support arm 311 or the second tensioning support arm 312 via a flat-head pin, and the straight rod 332 is rotatably connected to the second tensioning support arm 312 or the first tensioning support arm 311 via a flat-head pin.

[0056] Specifically, both the first adjusting nut 333 and the second adjusting nut 334 are provided with spring seats to facilitate the installation of the positioning spring 335.

[0057] Furthermore, the walking frame 1 includes a first frame plate 11 and a second frame plate 12, which are connected by a support column 1613. A walking support device 3 is rotatably connected between the first frame plate 11 and the second frame plate 12. The first frame plate 11 and the second frame plate 12 have anti-interference holes 13. The first frame plate 11 or the second frame plate 12 is provided with an inward U-shaped connecting seat 14 at the anti-interference hole 13. The U-shaped connecting seat 14 is rotatably connected to another walking support device 3. At least one anti-interference hole 13 and U-shaped connecting seat 14 are provided.

[0058] In this embodiment, two mutually perpendicular walking support devices 3 are provided. Under the combined action of the elastic force of the spring 335, the geometric force of the drive wheel 32 and the inner wall of the sleeve 4, the drive wheel 32 maintains a cross distribution to prevent the bore plate 2 from wearing unevenly.

[0059] Specifically, the rotating shaft 319 is provided with a second positioning sleeve between the walking support device 3 and the walking frame 1 to achieve axial positioning of the walking support device 3.

[0060] Specifically, the two ends of the rotating shaft 319 are rotatably connected to the traveling frame 1 through two oppositely arranged tapered roller bearings.

[0061] Furthermore, the guide plate 2 is a circular ring, and the inner ring of the guide plate 2 is provided with two opposing first fixing plates 21. The first support plate 11 and the second support plate 12 are provided with outwardly extending second fixing plates 15. The first fixing plates 21 and the second fixing plates 15 are connected by bolts and nuts to achieve a detachable connection.

[0062] Specifically, the first fixing plate 21 and the second fixing plate 15 are connected by two sets of bolts and nuts.

[0063] Specifically, the walking frame 1 is provided with a guide plate 2 at both ends, and the walking support device 3 is provided between the two guide plates 2.

[0064] Furthermore, the drive wheel 32 is a hub motor with a stator inside and a rotor outside. The stator is fixedly connected to the V-shaped adjustable wheel frame 31, such as by bolts. The outer wall of the rotor is the wheel surface. This arrangement can greatly save space and avoid assembly difficulties.

[0065] Specifically, the cable of the drive wheel 32 is connected to the driver 5 in the walking frame 1. The driver 5 is equipped with a drive power supply 6. The housings of the driver 5 and the drive power supply 6 are connected to the walking frame 1 by bolts. The cable of the drive wheel 32 is attached to the V-shaped adjustable wheel frame 31 and the walking frame 1 at a position that does not interfere with the movement.

[0066] In another embodiment, the cable of the drive wheel 32 is led out and controlled by an external driver and a drive power supply.

[0067] The driver 5 includes a microcontroller for programmable control, a driver board for controlling the drive wheel 32, and an infrared receiver for receiving control information. The microcontroller, driver board, and infrared receiver are all existing technologies, and their structural principles are clear to those in the art.

[0068] Example 2:

[0069] Based on Example 1, this embodiment provides an assembly process for an oil drilling casing surface gauging device:

[0070] 1. Insert the straight rod 332 into the hollow part of the sleeve rod 331, put on the spring 335, and install the first adjusting nut 333 and the second adjusting nut 33, so that the straight rod 332 is rotatably connected to the first tensioning support arm 311, and the sleeve rod 331 is rotatably connected to the second tensioning support arm 312, thus completing the assembly of the adjusting device 33 and the V-shaped adjustable wheel frame 31.

[0071] 2. Install the drive wheel 32 and the driven support wheel at the corresponding positions on the V-shaped adjustable wheel frame 31 to form a walking support device 3. Prepare two walking support devices 3 to be arranged in a cross shape and connected to the walking frame 1 respectively.

[0072] 3. Install the driver 5 and the power supply 6, and connect the driver 5 to the cable of the drive wheel 32 to provide power.

[0073] 4. Select and install the appropriate diameter disc 2 according to the size of sleeve 4.

[0074] The steps for using a surface gauging device for oil drilling casing:

[0075] 1. Place the assembled gauging device into the sleeve 4 to be tested. By adjusting the first adjusting nut 333 and the second adjusting nut 334, and utilizing the soft adjustment of the spring 335 and the hard adjustment of the first adjusting nut 333 and the second adjusting nut 334, adjust the angles of the first tensioning support arm 311 and the second tensioning support arm 312 so that the drive wheel 32 and the driven support wheel are tightly fitted against the inner wall of the sleeve 4. If it is inconvenient to adjust the device inside the sleeve 4, the gauging device can be removed, adjusted, and then placed back into the sleeve 4. Record the relationship between the diameter of the sleeve 4 and the positions of the first adjusting nut 333 and the second adjusting nut 334 to speed up the next adjustment.

[0076] 2. Start the drive power supply 6 to drive the drive wheel 32 to rotate, which will cause the gauging device to move inside the sleeve 4. The gauging disc 2 will perform gauging detection on the sleeve 4. If the gauging device is blocked from moving forward, it can be remotely reversed back to the starting point.

[0077] 3. After the test is completed, turn off the drive power 6. If it is necessary to test different sizes of sleeves 4, the caliper plate 2 can be removed and replaced. Repeat the above steps to adapt, adjust and test.

[0078] All components not discussed in detail in this application, as well as the connection methods of these components, are well-known technologies in this field. They can be directly applied and will not be elaborated further.

[0079] In this utility model, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0080] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0081] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0082] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A surface gauging device for oil drilling casing, comprising a traveling frame, a gauging disc, and a traveling support device, wherein the gauging disc is sleeved on the outer periphery of the traveling frame, characterized in that, The guide plate is detachably connected to the traveling frame; The walking support device includes a V-shaped adjustable wheel frame, the common end of which is rotatably connected to the walking frame, and drive wheels are provided at the two movable ends of the V-shaped adjustable wheel frame. The walking frame is provided with at least two non-overlapping walking support devices.

2. The surface diameter measuring device for oil drilling casing according to claim 1, characterized in that, The V-shaped adjustable wheel frame includes a first tensioning support arm and a second tensioning support arm; The first tensioning support arm and the second tensioning support arm are rotatably connected by a rotating shaft, which is rotatably connected to the walking frame. An adjustment device is provided between the first tensioning support arm and the second tensioning support arm to adjust the tension of the first tensioning support arm and the second tensioning support arm; A drive wheel is provided at one end of the first tensioning support arm away from the rotating shaft and at one end of the second tensioning support arm away from the rotating shaft, or a drive wheel is provided at one end of the first tensioning support arm away from the rotating shaft and at the other end of the second tensioning support arm away from the rotating shaft, and a driven support wheel is provided at the other end.

3. The surface diameter measuring device for oil drilling casing according to claim 2, characterized in that, The first tensioning support arm and the second tensioning support arm have the same structure, which is H-shaped, including a lower fork plate and a lower connecting plate; The drive wheel is disposed between the first fork plate and the second fork plate, and the wheel surface of the drive wheel protrudes from the first fork plate and the second fork plate; The first tensioning support arm and the second tensioning support arm are arranged opposite to each other, so that the two drive wheels are located on the same plane; An adjustment device is provided between the first connecting plate of the first tensioning support arm and the second connecting plate of the second tensioning support arm.

4. The surface diameter measuring device for oil drilling casing according to claim 3, characterized in that, The adjusting device includes a sleeve rod and a straight rod; The straight rod is slidably inserted into the sleeve rod, and the end of the sleeve rod away from the straight rod is rotatably connected to the first tensioning support arm or the second tensioning support arm. The end of the straight rod away from the sleeve rod is rotatably connected to the second tensioning support arm or the first tensioning support arm. The outer wall of the sleeve is threaded with a first adjusting nut, and the outer wall of the straight rod is connected with a second adjusting nut. A spring is provided between the first adjusting nut and the second adjusting nut.

5. The surface diameter measuring device for oil drilling casing according to claim 3, characterized in that, The walking frame includes a first frame plate and a second frame plate; The first and second frame plates are connected by support columns, and a walking support device is rotatably connected between the first and second frame plates. The first and second frame plates have anti-interference holes, and the first or second frame plate has an inward U-shaped connecting seat at the anti-interference hole. The U-shaped connecting seat is rotatably connected to another walking support device, and at least one anti-interference hole and U-shaped connecting seat are provided.

6. The surface diameter measuring device for oil drilling casing according to claim 5, characterized in that, The guide plate is a circular ring, and two opposing first fixing plates are provided on the inner ring of the guide plate. The first and second mounting plates are provided with outwardly extending second fixing plates, and the first and second fixing plates are connected by bolts and nuts.

7. The surface diameter measuring device for oil drilling casing according to claim 5, characterized in that, A first positioning sleeve is fitted between the first connecting plate and the second connecting plate; a second positioning sleeve is provided between the rotating shaft and the walking support device and the walking frame.

8. The surface diameter measuring device for oil drilling casing according to claim 3, characterized in that, The connecting plate in the first tensioning support arm and the second tensioning support arm is located between the first fork plate and the second fork plate.

9. A surface gauging device for oil drilling casing according to claim 1, characterized in that, Two mutually perpendicular walking support devices are provided. Both ends of the walking frame are provided with guide plates, and the walking support devices are located between the two guide plates.

10. A surface gauging device for oil drilling casing according to claim 1, characterized in that, The drive wheel is a hub motor, the walking frame is equipped with a driver, the hub motor's cable is connected to the driver, and the driver is equipped with a drive power supply.

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