A tubing gauge

Abstract

The present application belongs to the technical field of oilfield operation, and particularly relates to a tubing gauge, which comprises an outer cylinder extending upward and downward, and the upper end of the outer cylinder is closed; the outer cylinder is provided with a buffer cylinder, the buffer cylinder comprises a cylinder body fixedly arranged in the outer cylinder and a piston, the piston divides the inner cavity of the cylinder body into an upper cavity and a lower cavity, and an elastic member is arranged in the upper cavity; the tubing gauge further comprises a lower joint, the lower joint comprises a cylinder body which is sealingly sleeved on the outer part of the cylinder body in the upward and downward direction and slides, the lower end of the cylinder body is closed to form a cylinder cavity in the cylinder body; a throttle hole is arranged on the cylinder body and communicates the lower cavity and the cylinder cavity, the lower cavity and the cylinder cavity are filled with fluid, and the fluid in the cylinder cavity of the lower joint collides with a small block and then enters the lower cavity through the throttle hole; the lower end of the outer cylinder has a necked section to prevent the cylinder body from being pulled out downward by blocking cooperation; the lower joint further comprises a boss which is integrally formed at the lower end of the cylinder body, the boss is downwardly penetrated from the locking diameter section of the outer cylinder, and the boss is used for directly or indirectly colliding with the small block.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of oil field operation, and particularly relates to a tubing gauge. BACKGROUND

[0002] In downhole operation construction, corresponding tools are carried into the well by using a tubing string, and when the tubing is lowered, a tubing gauge must be used to pass the tubing so as to prevent the blockage in the tubing from entering the well. The tubing string is composed of one by one tubing connected through threads, and when the tubing is lowered, two parallel tubings are fixed on site as a slide, a small trolley is placed on the slide, the lower part of the small trolley has a pulley supported on the tubing, and the upper part has a groove used to support the tubing. One end of the tubing to be lowered is placed in the groove of the small trolley, and the other end has a coupling, the coupling is connected to a vertical lifting power device through a lifting clamp, the power device pulls the lifting clamp to drive the tubing to gradually change from a horizontal state to a vertical state, and then the tubing is lowered into the well. When the tubing gauge is used, it is placed from the coupling end of the tubing in the horizontal state, and when the tubing is pulled up to a certain height under the support of the small trolley, the tubing gauge slides to the bottom of the tubing by gravity. Since the length of the single tubing is 9-10 m, when the tubing gauge reaches the bottom, the lower impact force is large, and there are two hidden dangers: one is that the small trolley or the tubing below the small trolley is easily damaged; and the other is that the impact force of the tubing gauge easily knocks the tubing below the small trolley to the ground, which has a safety hidden danger of hurting people.

[0003] In order to solve the problem, a new type of buffering tubing gauge is disclosed in the Chinese utility model patent with the authorization publication number CN204202538U, which reduces the impact of the tubing gauge on the small trolley by setting a spring, and eliminates the sparks generated due to friction by using a front rubber head.

[0004] Although the tubing gauge of the prior art can reduce the impact on the small trolley to a certain extent by using the spring, since the buffering is only relied on the spring, the buffering effect is limited, and the impact force of the tubing gauge is still large, the impact force is still large when the tubing gauge contacts the small trolley, and the small trolley and the tubing below the small trolley are easily damaged. In addition, since the impact force is large, when the spring is unloaded, the tubing gauge needs to be repeatedly moved up and down in the tubing for several times to stop, which prolongs the construction time on site. SUMMARY

[0005] The present application aims to provide a tubing gauge to solve the technical problems that the impact force of the tubing gauge of the prior art is large and the small trolley is easily damaged, and the construction time is long.

[0006] In order to achieve the above-mentioned purpose, the technical scheme of the tubing gauge provided by the present application is as follows: a tubing gauge, comprising:

[0007] an outer cylinder extending upward and downward, the upper end of the outer cylinder being closed;

[0008] The buffer cylinder comprises a cylinder body fixed in an outer cylinder and a piston slidingly and sealingly fitted in the cylinder body in the up-down direction, the piston divides the inner cavity of the cylinder body into an upper cavity and a lower cavity, and an elastic member is arranged in the upper cavity and is press-fitted between the top surface of the piston and the inner wall of the cylinder body in the up-down direction;

[0009] The lower joint comprises a barrel body slidingly and sealingly fitted outside the cylinder body in the up-down direction, and the lower end of the barrel body is closed to form a barrel cavity in the barrel body;

[0010] A throttle hole is arranged on the cylinder body and communicates the lower cavity and the barrel cavity, and the lower cavity and the barrel cavity are filled with fluid, and the fluid in the barrel cavity is introduced into the lower cavity through the throttle hole after the lower joint collides with the small pulley;

[0011] The lower end of the outer cylinder has a necked section to abut against the barrel body and prevent the barrel body from being pulled out downward;

[0012] The lower joint further comprises a boss integrally formed at the lower end of the barrel body, the boss passes downward from the locking section of the outer cylinder, and the boss is used to directly or indirectly collide with the small pulley.

[0013] Beneficial effects: the upper end of the outer cylinder is closed, compared with the annular structure, the resistance of the oil pipe gauge when it goes down is greater, and the going down of the oil pipe gauge is buffered. The impact force can also be buffered during the process that the fluid enters the lower cavity through the throttle hole, and the elastic member can further buffer. In the present application, by arranging multiple levels of buffering, the impact force when the oil pipe gauge contacts the small pulley can be reduced, and the small pulley is protected. Moreover, because the multiple levels of buffering can reduce the impact force of the oil pipe gauge, after the oil pipe gauge collides with the small pulley, the number of repeated movements is reduced, and the on-site construction time is shortened.

[0014] Preferably, the throttle hole comprises a central hole and an eccentric offset hole;

[0015] The lower joint further comprises a movable rod arranged in the barrel cavity, the movable rod comprises a rod portion slidingly and sealingly fitted in the central hole in the up-down direction, and further comprises a head portion below the rod portion;

[0016] A compression spring is press-fitted between the head portion and the lower end of the cylinder body;

[0017] When the barrel body moves upward to the end, the bottom wall of the barrel cavity hits the head portion of the movable rod to compress the compression spring. After the movable rod and the compression spring are arranged, when the elastic member in the upper cavity is compressed to the end, the barrel body still goes upward, and the movable rod and the compression spring can be used for further buffering to further reduce the impact force.

[0018] Preferably, the movable rod further comprises a step between the rod portion and the head portion, and the compression spring is fixedly fitted outside the step.

[0019] Preferably, the inner cavity of the barrel comprises an upper large-diameter section and a lower small-diameter section.

[0020] The head of the movable rod is arranged in the small-diameter section, which guides the head. The stability of the head during movement is improved by the guidance.

[0021] Preferably, the lower end of the boss is provided with a buffer block, and an arc-shaped transition edge is arranged between the bottom surface and the side surface of the buffer block. The arc-shaped transition edge on the bottom of the buffer block increases the contact area when colliding with the groove on the small pulley, thereby improving the buffering effect.

[0022] Preferably, the upper cavity is a closed chamber, and the air in the upper cavity can be compressed when the piston moves upward. The air can also be buffered when compressed.

[0023] Preferably, a compression cap is threadedly assembled on the upper end of the outer barrel, and the compression cap is used to close the upper end of the outer barrel.

[0024] The buffer cylinder comprises a plug arranged on the compression cap and a buffer pipe body arranged on the plug, and the lower end of the buffer pipe body is provided with the throttle hole.

[0025] Preferably, the upper end of the outer barrel is provided with a counterweight. When the weight of the oil pipe gauge is small, the passability can be improved by adding the counterweight.

[0026] Preferably, the lower end of the counterweight is provided with an external thread for mounting on the outer barrel, and the upper end is provided with an internal thread for connecting adjacent counterweights.

[0027] Preferably, the outer barrel is directly or indirectly provided with a cleaning brush, and the overall outer diameter of the cleaning brush is greater than the outer diameter of the outer barrel, so as to clean the inner wall of the oil pipe during the passability. The cleaning brush can clean the dirt on the inner wall of the oil pipe and reduce the residues on the inner wall of the oil pipe. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 Structure schematic view of the oil pipe gauge embodiment 1 provided by the present application;

[0029] Figure 2 Structure schematic view of the oil pipe gauge embodiment 2 provided by the present application;

[0030] Figure 3 Structure schematic view of the oil pipe gauge embodiment 3 provided by the present application;

[0031] Figure 4 Structure schematic view of the oil pipe gauge embodiment 4 provided by the present application;

[0032] BRIEF DESCRIPTION OF DRAWINGS

[0033] 1, outer cylinder; 101, lower end through hole; 102, upper end inner cavity; 2, pressure cap; 3, screw plug; 4, buffer tube body; 401, upper cavity; 402, lower cavity; 403, center hole; 404, offset hole; 5, piston; 6, first spring; 7, lower joint; 701, cylinder body; 702, boss; 703, large diameter section; 704, small diameter section; 8, buffer block; 9, movable rod; 901, first section; 902, second section; 903, third section; 10, second spring; 11, first counterweight; 12, second counterweight; 13, cleaning brush. DETAILED DESCRIPTION

[0034] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application, that is, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application generally described and shown in the drawings can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0036] It should be noted that the relationship terms such as "first" and "second" and the like that can appear are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any actual relationship or order between the entities or operations. Moreover, terms such as "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the elements defined by the statement "including a" or the like do not exclude processes, methods, articles or devices including the elements from the process, method.

[0037] In the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting" that can appear should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the term "provided with" that can occur should be understood in a broad sense, for example, the object "provided with" can be a part of the body, or can be arranged separately from the body and connected to the body, and the connection can be detachable or non-detachable. For those skilled in the art, the specific meaning of the above-mentioned term in the present application can be understood according to the specific circumstances.

[0039] The present application will be further described in detail below in combination with embodiments.

[0040] Specific embodiment 1 of the oil pipe gauge provided by the present application:

[0041] As shown in the drawings, the oil pipe gauge comprises an outer cylinder 1 and a buffer mechanism arranged in the outer cylinder 1. Figure 1 The outer cylinder 1 is through from top to bottom, and the outer cylinder 1 is provided with a lower end through hole 101 and an upper end inner cavity 102, the inner diameter of the lower end through hole 101 is smaller than the inner diameter of the upper end inner cavity 102, so that a necked section is formed at the lower end through hole 101, the necked section can block the cylinder body 701 to prevent the cylinder body 701 from being pulled out downward, and the top inner side of the upper end inner cavity 102 is provided with an internal thread.

[0042] The buffer mechanism comprises a buffer pipe body 4 and a lower joint 7, the buffer pipe body 4 is a cylindrical structure, and the upper end is provided with an internal thread, a plug 3 is installed in the upper end by screwing, the plug 3 is provided with two stepped sections with the upper section being larger than the lower section, the lower section is provided with an external thread for being screwed into the upper end of the buffer pipe body 4; the upper section is provided with an external thread, and a compression cap 2 is threadedly assembled on the upper section, the upper center of the compression cap 2 is provided with an internal hexagonal hole, and during use, a tool is inserted into the internal hexagonal hole to threadedly assemble the compression cap 2 in the outer cylinder 1.

[0043] A piston 5 is slidingly and sealingly assembled in the buffer pipe body 4, and the piston 5 divides the inner cavity of the buffer pipe body 4 into an upper cavity 401 and a lower cavity 402, the upper cavity 401 is a closed chamber formed by cooperation of the buffer pipe body 4, the piston 5 and the plug 3. A first spring 6 is welded on the upper end surface of the piston 5, and the other end of the first spring 6 is welded on the lower end surface of the plug 3, and the first spring 6 here is a compression spring.

[0044] As shown in the drawings, the oil pipe gauge comprises an outer cylinder 1 and a buffer mechanism arranged in the outer cylinder 1.

[0045] Figure 1 ​As shown, the lower joint 7 comprises a cylinder body 701 and a boss 702, the cylinder body 701 is located in the upper end inner cavity 102, the boss 702 is integrally formed at the lower end of the cylinder body 701, and the boss 702 penetrates the lower end through hole 101. The cylinder body 701 is closed at the lower end and open at the upper end, the cylinder body 701 is slidingly sealed outside the buffer pipe body 4, the cylinder body inner cavity of the cylinder body 701 is communicated with the lower cavity 402 of the buffer pipe body 4, and specifically, a throttle hole is arranged at the bottom of the buffer pipe body 4, and the inner cavity of the cylinder body 701 is communicated with the lower cavity 402 through the throttle hole. The throttle hole here includes a central hole 403 located at the center of the buffer pipe body 4 and an eccentric hole 404 arranged eccentrically. The hole diameter of the central hole 403 is larger than that of the eccentric hole 404. When the fluid (including gas and liquid) in the inner cavity of the cylinder body 701 enters the lower cavity 402 through the throttle hole, the throttling effect can be generated to achieve buffering. As shown in the figure, Figure 1 As shown, the inner cavity of the cylinder body 701 is divided into an upper large-diameter section 703 and a lower small-diameter section 704.

[0046] As shown, Figure 1 The boss 702 penetrates downward from the outer cylinder 1, and the buffer block 8 is fixed on the boss 702. The buffer block 8 is in a cylindrical structure, and the lower end edge of the buffer block 8 is arranged in an arc transition, that is, there is an arc transition between the bottom surface and the side surface. In this embodiment, the material of the buffer block 8 is a non-metal material, which is relatively soft and can buffer to a certain extent when colliding with the small trolley. Moreover, the bottom of the buffer block 8 is arc-shaped, which can increase the contact area with the small trolley and further buffer.

[0047] In this embodiment, a sealing ring groove is arranged between the plug 3 and the buffer pipe body 4, between the piston 5 and the buffer pipe body 4, and between the cylinder body 701 and the buffer pipe body 4, and a sealing ring is installed.

[0048] When the present application works, first, according to the oil pipe inner diameter size, select the matched oil pipe gauge. Put the one end of the buffer block 8 into the inner cavity of the oil pipe to be detected, when the oil pipe is hoisted to a certain height, the oil pipe gauge slides down along the inner cavity of the oil pipe under the action of gravity, under the closed action of the thread block 3 and the pressure cap 2, the oil pipe gauge is in a closed structure, in the process of sliding down, the oil pipe gauge is affected by air resistance, forming the first buffer of the oil pipe gauge, when the buffer block 8 contacts the oil pipe trolley, the arc transition structure at the end of the buffer block 8 plays a role, increases the contact surface with the oil pipe trolley, and reduces the impact force of the oil pipe gauge and the trolley. The lower joint 7 is pulled up by the reverse force of the trolley, the inner cavity volume of the cylinder body 701 is reduced, the hydraulic oil in the cylinder body 701 enters the lower cavity 402 of the buffer pipe body 4 through the center hole 403 and the eccentric hole 404, the center hole 403 and the eccentric hole 404 play the role of throttling and increasing the flow resistance, and play a certain buffering effect. After the hydraulic oil enters the lower cavity 402, the volume of the lower cavity 402 increases, and the piston 5 is pressed upward, the first spring 6 and the air in the upper cavity 401 are compressed, and the impact force of the oil pipe gauge is further reduced. After the gauge is completed, under the action of the first spring 6 and the compressed air in the upper cavity 401, the piston 5 is lowered, the lower joint 7 is pushed down, and the buffer block 8 is reset.

[0049] In the embodiment, the pressure cap 2 seals the upper end of the outer cylinder 1. The thread block 3, the buffer pipe body 4 and the piston 5 form a buffer cylinder together, and the thread block 3 and the buffer pipe body 4 form the cylinder body of the buffer cylinder. The first spring 6 forms an elastic member in the upper cavity 401, and the elastic member is pressed between the inner wall of the cylinder body (the thread block 3 in the embodiment) and the top surface of the piston 5. In other embodiments, the elastic member can be a rubber block or the like.

[0050] When the inner cavity of the cylinder body and the lower cavity 402 are filled with gas, the air is compressed when the cylinder body 701 moves upward, which can further buffer.

[0051] The specific embodiment 2 of the oil pipe gauge of the present application is as follows:

[0052] The difference from the embodiment 1 is that, on the basis of the embodiment 1, Figure 2As shown, in the embodiment, the sliding seal in the central hole 403 is equipped with a movable rod 9, specifically, the movable rod 9 comprises a first section 901, a second section 902 and a third section 903 arranged in sequence from bottom to top, the outer diameters of the first section 901, the second section 902 and the third section 903 gradually decrease, the first section 901 is located at the small-diameter section 704, the outer diameter of the first section 901 is slightly smaller than the inner diameter of the small-diameter section 704, the small-diameter section 704 can right the first section 901, and the lower edge of the first section 901 is arc-shaped transition. A second spring 10 is sleeved on the second section 902, the second spring 10 is welded on the end face of the first section 901, the other end of the second spring 10 is welded on the lower end face of the buffer pipe body 4, and the second spring 10 here is a compression spring. The third section 903 penetrates into the central hole 403, and there is a sealing ring between the third section 903 and the central hole 403.

[0053] In use, when the first spring 6 is not enough to completely buffer the impact force of the oil pipe gauge, the cylinder body 701 continues to go up, the cylinder body 701 pushes the movable rod 9, and the second spring 10 is compressed, further reducing the impact of the impact force on the oil pipe gauge and the small block.

[0054] In the embodiment, the first section 901 in the movable rod 9 constitutes the head of the movable rod 9, the second section 902 constitutes the step for sleeving the second spring 10, and the third section 903 constitutes the rod part for penetrating into the central hole 403.

[0055] In other embodiments, the step on the movable rod can be cancelled, and the large-diameter section 703 and the small-diameter section 704 in the inner cavity of the cylinder body can be replaced by an equal-diameter structure.

[0056] Specific embodiment 3 of the oil pipe gauge of the application:

[0057] The difference from embodiment 2 is that, on the basis of embodiment 2, Figure 3 As shown, in the embodiment, counterweights are installed on the upper end of the outer cylinder 1, and there are two counterweights, namely a first counterweight 11 and a second counterweight 12, the first counterweight 11 is threadedly installed on the outer cylinder 1, and the second counterweight 12 is threadedly installed on the first counterweight 11, and the number of counterweights can be changed according to actual conditions in use. During the gauging process, if the resistance in the oil pipe is large, the self-weight of the oil pipe gauge can be increased by increasing the counterweights, so as to improve the gauging effect.

[0058] It should be noted that the embodiment can also be based on embodiment 1.

[0059] Specific embodiment 4 of the oil pipe gauge of the application:

[0060] The difference from embodiment 3 is that, on the basis of embodiment 3, Figure 4As shown, in the embodiment, the cleaning brushes 13 are arranged on the outer circumferences of the first counterweight 11 and the second counterweight 12, and the cleaning brushes 13 are steel wire brushes, and the outer diameters of the cleaning brushes 13 are greater than the outer diameter of the outer cylinder 1. During the running-in, the cleaning brushes 13 can clean the dirt in the oil pipe.

[0061] In specific use, the material of the cleaning brushes 13 can be changed, such as plastic brushes and the like. The number of the cleaning brushes 13 can also be changed.

[0062] It should be noted that the embodiment is obtained by adding on the basis of the embodiment 3. In fact, in order to realize the running-in while cleaning the dirt in the oil pipe, the cleaning brushes can be directly installed on the outer cylinder, at this time, whether there is a counterweight or not, cleaning can be carried out.

[0063] The specific embodiment 5 of the oil pipe running-in gauge of the application:

[0064] The difference from the embodiment 1 is that, in the embodiment 1, the cylinder body of the buffer cylinder is composed of a plug and a buffer pipe body, and the buffer pipe body is through-penetrated. In the embodiment, the cylinder body of the buffer cylinder is of an integrated structure, and the cylinder body is fixed on the pressure cap.

[0065] The specific embodiment 6 of the oil pipe running-in gauge of the application:

[0066] The difference from the embodiment 1 is that, in the embodiment 1, the upper cavity 401 is a closed chamber, and the air in the upper cavity 401 can be compressed when the piston 5 goes up. In the embodiment, the upper cavity is communicated with the outside through the upper hole.

[0067] The specific embodiment 7 of the oil pipe running-in gauge of the application:

[0068] The difference from the embodiment 1 is that, in the embodiment 1, the upper end of the outer cylinder 1 is closed by the pressure cap 2, and the pressure cap 2 is used as a carrier for installing the cylinder body of the buffer cylinder. In the embodiment, the upper end of the outer cylinder is still closed by the pressure cap, but the cylinder body of the buffer cylinder is not connected with the pressure cap, and a support frame is arranged on the outer cylinder to fix and install the cylinder body.

[0069] The specific embodiment 8 of the oil pipe running-in gauge of the application:

[0070] The difference from the embodiment 1 is that, in the embodiment 1, the lower end of the boss 702 is provided with the buffer block 8, and the bottom of the buffer block 8 has an arc-shaped transition edge. In the embodiment, the arc-shaped transition edge of the buffer block is cancelled, and the buffer block still retains sharp edges. In other embodiments, the buffer block is cancelled, and the boss directly impacts the small trolley.

[0071] The specific embodiment 9 of the oil pipe running-in gauge of the application:

[0072] Different from the embodiment 1, in the embodiment 1, the throttle hole includes the center hole and the offset hole. In this embodiment, the aperture and arrangement of the throttle hole can be changed, such as only keeping the offset hole, etc.

[0073] Finally, it should be noted that the above only for the preferred embodiments of the present application, and is not intended to limit the present application, although in the foregoing detailed description of the application has been made with reference to the foregoing embodiments, for those skilled in the art, it still can be recorded in the foregoing embodiments of the technical solutions of the modification, or part of the technical features of the equivalent replacement. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included within the scope of the present application.

Claims

1. A tubing gauge, characterized by: The utility model relates to a buffer cylinder, which comprises an outer cylinder (1) extending upward and downward, the upper end of the outer cylinder (1) being closed; a buffer cylinder comprising a cylinder body fixed in the outer cylinder (1) and a piston (5) slidingly and sealingly fitted in the cylinder body in the upward and downward direction, the piston (5) dividing the inner cavity of the cylinder body into an upper cavity (401) and a lower cavity (402), an elastic member being arranged in the upper cavity (401) and being press-fitted between the top surface of the piston (5) and the inner wall of the cylinder body in the upward and downward direction; a lower connector (7) comprising a barrel (701) slidingly and sealingly fitted outside the cylinder body in the upward and downward direction, the lower end of the barrel (701) being closed to form an inner cavity of the barrel (701) in the barrel (701); a throttling hole being arranged on the cylinder body to communicate the lower cavity (402) with the inner cavity of the barrel (701), the lower cavity (402) and the inner cavity of the barrel (701) being filled with fluid, the fluid in the inner cavity of the barrel (701) entering the lower cavity (402) through the throttling hole after the lower connector (7) collides with a small trolley; the lower end of the outer cylinder (1) has a necked section to prevent the barrel (701) from being pulled out downward by blocking the barrel (701); the lower connector (7) further comprises a boss (702) integrally formed at the lower end of the barrel (701), the boss (702) penetrating downward from the necked section of the outer cylinder (1), the boss (702) being used for directly or indirectly colliding with the small trolley, a buffer block (8) being arranged at the lower end of the boss, and a counterweight being arranged at the upper end of the outer cylinder. The throttling hole comprises a central hole (403) and an eccentric hole (404); The lower connector (7) further comprises a movable rod (9) arranged in the inner cavity of the barrel (701), the movable rod (9) comprising a rod portion slidingly and sealingly fitted in the central hole (403) in the upward and downward direction and a head portion arranged below the rod portion; A compression spring is press-fitted between the head portion and the lower end of the cylinder body; When the barrel (701) moves upward to the end, the bottom wall of the inner cavity of the barrel (701) collides with the head portion of the movable rod (9) to compress the compression spring. The movable rod (9) further comprises a step between the rod portion and the head portion, and the compression spring is fixedly fitted outside the step. The inner cavity of the barrel (701) comprises a large-diameter section at the upper portion and a small-diameter section at the lower portion; 2. The tubing gauge as defined in claim 1, wherein: The head portion of the movable rod (9) is arranged in the small-diameter section, and the small-diameter section is used for guiding the head portion. An arc-shaped transition edge is arranged between the bottom surface and the side surface of the buffer block (8). The upper cavity (401) is a closed chamber, and the air in the upper cavity (401) can be compressed when the piston (5) moves upward. A compression cap (2) is threadedly fitted at the upper end of the outer cylinder (1), and the compression cap (2) is used for closing the upper end of the outer cylinder (1); 3. The tubing gauge as defined in claim 2, wherein: The buffer cylinder comprises a nipple (3) arranged on the compression cap (2) and a buffer pipe body (4) arranged on the nipple (3), and the lower end of the buffer pipe body (4) is provided with the throttling hole.

4. The tubing gauge as defined in claim 2, wherein: The lower end of the counterweight has an external thread for being mounted on the outer cylinder (1), and the upper end of the counterweight has an internal thread for connecting adjacent counterweights. The outer cylinder (1) is directly or indirectly provided with a cleaning brush (13), and the overall outer diameter of the cleaning brush (13) is greater than the outer diameter of the outer cylinder (1) to clean the inner wall of the oil pipe when the pipe is passed.

5. The oil line gauge according to any one of claims 1 to 4, characterized in that: ​ 6. The oil line gauge according to any one of claims 1 to 4, characterized in that: ​ 7. The oil line gauge according to any one of claims 1 to 4, characterized in that: ​ ​ 8. The tubing gauge as defined in claim 1, wherein: ​ 9. The oilfield tubular gauge of any of claims 1-4, wherein: ​

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