Tool for measuring length of sealing surface of special screwed joint of oil casing

Abstract

The utility model relates to the technical field of measurement, in particular to a tool for measuring the length of a sealing surface of a special screwed joint of an oil casing. Comprising an upper baffle and a lower baffle which are in elastic sliding connection, stop levers are fixed to the end faces, opposite to the special threaded connector, of the upper baffle and the lower baffle, a groove is formed in the end face, facing the special threaded connector, of the upper baffle, a ruler is arranged on the upper baffle in the axial direction of the special threaded connector in a sliding mode, and the ruler is perpendicular to the upper baffle. A measuring head is slidably arranged on the side, facing the special threaded connector, of the ruler. During measurement, the length value of the sealing surface can be directly obtained through the scale difference value of the scale only by sliding the scale to the stop end of the sealing surface, the steps of D1 and D2 measurement and radius compensation calculation in the prior art are omitted, and the measurement efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of measurement technology, specifically to a tool for measuring the length of the sealing surface of a special threaded joint in an oil casing. Background Technology

[0002] With the increasing number of deep wells, ultra-deep wells, high-temperature and high-pressure gas wells, thermal recovery wells, and high-difficulty wells containing corrosive gases in major oilfields, higher requirements have been placed on the sealing performance, connection strength, and corrosion resistance of oil casing threaded joints. API standard threaded joints can no longer meet the requirements of these challenging wells. Special threaded joints, also known as non-API threaded joints or high-quality threaded joints, employ entirely new sealing methods, strength structures, and thread profiles, and are widely used due to their excellent sealing performance and strong connectivity. Currently, many manufacturers both domestically and internationally have their own special threaded joints and have begun mass production. Special threaded joints require small tolerances for various parameters, especially the length of the sealing surface, which plays a crucial role in the main sealing function. The lack of specialized tools for on-site inspection means that some substandard products go undetected, potentially leading to quality incidents when used under harsh well conditions in oilfields.

[0003] To address the aforementioned technical problems, patent document CN218916150U discloses a measuring tool for the length of the sealing surface of a special threaded joint in an oil casing. The tool includes a measuring assembly comprising a bracket and a measuring rod. The bracket is placed vertically, with the end of the special threaded joint resting against the end face of the bracket. A track hole is provided at the upper part of the bracket, through which the measuring rod horizontally passes and slides. A detection component is provided at one end of the measuring rod, and this detection component vertically abuts against the sealing surface of the special threaded joint. During measurement: 1. Hold the handle and press the inner plane of the measuring tool bracket against the top of the sealing surface of the special threaded joint. Move the tool up and down so that the detection head is approximately close to the sealing surface of the special threaded joint. 2. Slide the detection rod backward until the detection head is flush against the inner surface of the bracket. Observe the position reading of the outer surface of the bracket on the scale line of the detection rod and record it as D1. 3. Slide the detection rod forward until the tip of the lower end of the detection head is at the last end of the sealing surface. Tighten the fixing nut, remove the detection tool, and observe the position reading of the outer surface of the bracket on the scale line of the detection rod. Record it as D2. Calculate the length D of the sealing surface of the special threaded joint using the following formula: D = D2 - D1 - R, where R is the radius R of the detection head.

[0004] The technical solution described in the aforementioned patent document cannot effectively stabilize the sealing surface of the special threaded joint on the measuring joint when measuring it, making the operation inconvenient. Furthermore, multiple measurement values ​​need to be marked during the measurement process, and the length of the sealing surface of the special threaded joint needs to be calculated after the measurement, making it inconvenient to use. Utility Model Content

[0005] The main purpose of this utility model is to provide a sealing surface length measuring tool that can directly measure the length of the sealing surface of a special threaded joint, stabilize it on the special threaded joint during the measurement process, and is easy to operate.

[0006] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0007] A measuring tool for the sealing surface length of a special threaded joint in an oil casing includes an upper baffle and a lower baffle, which are elastically slidably connected. The end faces of the upper and lower baffles opposite the special threaded joint are flush. A stop bar is fixed to the end faces of both the upper and lower baffles opposite the special threaded joint. A groove is formed on the end face of the upper baffle facing the special threaded joint, the length direction of which is parallel to the radial direction of the special threaded joint. A scale is slidably mounted on the upper baffle along the axial direction of the special threaded joint, passing through the upper baffle and the groove, and is perpendicular to the upper baffle. A measuring head is slidably mounted on the side of the scale facing the special threaded joint. The sliding direction of the measuring head is parallel to the radial direction of the special threaded joint. The measuring head is perpendicular to the scale. The upper end of the measuring head is elastically connected to the scale. The lower end of the measuring head is a pointed tip that can enter the groove. When the measuring head enters the groove and presses against the upper baffle, the pointed tip of the lower end of the measuring head is flush with the end face of the upper baffle facing the special threaded joint. After the pointed tip of the lower end of the measuring head is flush with the end face of the upper baffle facing the special threaded joint, the zero mark on the scale is flush with the end of the upper baffle away from the special threaded joint.

[0008] Specifically, the upper baffle and the lower baffle can slide relative to each other in the radial direction of the special threaded joint. The upper baffle and the lower baffle are arranged above and below each other. A square hole is opened in the lower part of the upper baffle. A square rod is slidably arranged in the square hole. The lower end of the square rod is fixedly connected to the upper end of the lower baffle. The upper end of the square rod is connected to the upper baffle through a spring. The spring is located in the square hole.

[0009] Specifically, the upper end of the spring is fixedly connected to the upper baffle, and the lower end of the spring is fixedly connected to the upper end of the square rod.

[0010] Specifically, each of the stop bars is embedded with a magnet, and the axial direction of the stop bar is parallel to the axial direction of the special threaded joint.

[0011] Specifically, the upper end of the measuring head is connected to the scale via a tension spring, and a stop block is fixed on the side of the upper end of the measuring head facing the upper baffle. The cross-section of the measuring head is rectangular.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] 1. By dynamically fitting the measuring head, which features elastic reset, to the sealing surface of a special threaded joint, and in conjunction with the zero-point calibration function of the scale (the zero mark of the scale is aligned when the tip of the measuring head is flush with the end face of the baffle), the end position of the sealing surface can be directly read. During measurement, simply slide the scale to the end of the sealing surface, and the length value of the sealing surface can be directly obtained through the difference in scale readings, eliminating the D1 and D2 measurement and radius compensation calculation steps in existing technologies, thus improving measurement efficiency.

[0014] 2. The upper and lower baffles form an elastic clamping mechanism with the spring through the sliding pair of square rod and square hole. With the help of the magnetic stop bar, it can automatically adapt to different pipe diameters. Under the dual action of spring tension and magnetic attraction, it stably fits the inner wall of the threaded joint. Compared with the traditional manual positioning method, the clamping stability is improved.

[0015] 3. When starting the measurement, avoid the tip of the measuring head getting caught between the special threaded connector and the upper baffle to ensure measurement accuracy. At the start of the measurement, keep the tip of the measuring head away from the beginning of the sealing surface of the special threaded connector, so that the scale can move the measuring head to the left. After the stop block separates from the upper baffle, the lower tip of the measuring head can contact the sealing surface of the special threaded connector under the elastic force of the tension spring, which facilitates the subsequent alignment of the tip of the measuring head with the stop end of the sealing surface of the special threaded connector.

[0016] 4. The measuring head can slide radially and is in close contact with the sealing surface. It can accurately measure within the range of thread taper, and its adaptability to working conditions far exceeds that of traditional rigid measuring tools. Attached Figure Description

[0017] Figure 1 This is a front view of the measuring tool used to measure the length of the sealing surface of a special threaded joint.

[0018] Figure 2 This is a schematic diagram of the measuring tool.

[0019] Figure 3 This is a top view of the measuring tool.

[0020] Figure 4 for Figure 3 Sectional view along line AA.

[0021] Figure 5 This is a schematic diagram showing the measuring head after it has been removed from the groove.

[0022] The parts in the attached diagram are named as follows: 1. Special threaded connector, 2. Sealing surface, 3. Lower baffle, 4. Stop bar, 5. Magnet, 6. Upper baffle, 7. Square bar, 8. Spring, 9. Scale, 10. Measuring head, 11. Groove, 12. Tension spring, 13. Stop block. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0024] Example 1: Refer to Figures 1-5 As shown, a measuring tool for measuring the length of the sealing surface of a special threaded joint for oil casing includes an upper baffle 6 and a lower baffle 3, which are elastically slidably connected.

[0025] The upper baffle 6 and the lower baffle 3 can slide relative to each other in the radial direction of the special threaded joint 1. The upper baffle 6 and the lower baffle 3 are arranged vertically. A square hole is opened in the lower part of the upper baffle 6. A square rod 7 is slidably arranged in the square hole. The lower end of the square rod 7 is fixedly connected to the upper end of the lower baffle 3. The upper end of the square rod 7 is connected to the upper baffle 6 by a spring 8.

[0026] Spring 8 is located inside the square hole. The upper end of spring 8 is fixedly connected to the upper baffle 6, and the lower end of spring 8 is fixedly connected to the upper end of square rod 7.

[0027] The upper baffle 6 and the lower baffle 3 are flush with the end faces of the special threaded joint 1. A stop rod 4 is fixed to the end faces of both the upper baffle 6 and the lower baffle 3 opposite to the special threaded joint 1. The axial direction of the stop rod 4 is parallel to the axial direction of the special threaded joint 1.

[0028] The upper baffle 6 has a groove 11 on its end face facing the special threaded joint 1. The length direction of the groove 11 is parallel to the radial direction of the special threaded joint 1.

[0029] A scale 9 is slidably provided on the upper baffle 6 along the axial direction of the special threaded joint 1. The scale 9 passes through the upper baffle 6 and the groove 11 and is perpendicular to the upper baffle 6.

[0030] A measuring head 10 is slidably mounted on the side of the scale 9 facing the special threaded connector 1, and the sliding direction of the measuring head 10 is parallel to the radial direction of the special threaded connector 1. The measuring head 10 is perpendicular to the scale 9. The upper end of the measuring head 10 is elastically connected to the scale 9. Specifically, the upper end of the measuring head 10 is connected to the scale 9 via a tension spring 12.

[0031] The cross-section of the measuring head 10 is rectangular, and the lower end of the measuring head 10 is a pointed tip.

[0032] The measuring head 10 can enter the groove 11. When the measuring head 10 enters the groove 11 and is pressed against the upper baffle 6, the tip of the lower end of the measuring head 10 is flush with the end face of the upper baffle 6 facing the special threaded connector 1. After the tip of the lower end of the measuring head 10 is flush with the end face of the upper baffle 6 facing the special threaded connector 1, the zero mark on the scale 9 is flush with the end of the upper baffle 6 away from the special threaded connector 1.

[0033] When measuring the length of the sealing surface 2 of the special threaded connector 1, such as Figure 1 As shown, the measuring head 10 is positioned in the groove 11 and pressed against the upper baffle 6, so that the upper baffle 6 and the lower baffle 3 are close to each other, the spring 8 is compressed, and the upper and lower baffles 4 are positioned in the special threaded joint 1. Then the upper baffle 6 and the lower baffle 3 are released. Under the elastic force of the spring 8, the upper and lower baffles 4 can press against the inner edge surface of the special threaded joint 1.

[0034] Then, push the measuring tool to the left, bringing it close to the special threaded connector 1, so that the left end faces of the upper baffle 6 and the lower baffle 3 contact the right end of the special threaded connector 1. As the measuring head 10 enters the groove 11 and presses against the upper baffle 6, the tip of the lower end of the measuring head 10 is flush with the end face of the upper baffle 6 facing the special threaded connector 1. At this time, the tip of the measuring head 10 is flush with the starting end of the sealing surface 2 of the special threaded connector 1. Simultaneously, the zero mark on the scale 9 is flush with the end of the upper baffle 6 away from the special threaded connector 1.

[0035] Then, the scale 9 drives the measuring head 10 to move to the left. Under the guidance of the sealing surface 2 of the special threaded joint 1, the measuring head 10 can slide in the radial direction of the special threaded joint 1 within the scale 9 during its movement to the left. When the tip of the measuring head 10 is flush with the stop end of the sealing surface 2 of the special threaded joint 1, the value of the scale line corresponding to the right end face of the upper baffle 6 is the length of the sealing surface 2 of the special threaded joint 1.

[0036] Example 2: Based on Example 1, referring to... Figure 1 As shown, magnets 5 are embedded and fixed inside each of the stop bars 4.

[0037] By setting a magnet 5 inside the stop bar 4, the magnet 5 can magnetically attract the special threaded connector 1, thereby improving the stability of this measuring tool on the special threaded connector 1.

[0038] Example 3: Based on Example 1, referring to... Figure 1 As shown, a stop block 13 is fixed on the side of the upper end of the measuring head 10 facing the upper baffle 6.

[0039] Before the measuring head 10 enters the groove 11, it is moved upwards. When the measuring head 10 enters the groove 11 and presses against the upper baffle 6, the upper end of the upper baffle 6 acts as a barrier to prevent the tip of the measuring head 10 from getting stuck between the special threaded connector 1 and the upper baffle 6 at the start of the measurement, thus ensuring measurement accuracy. At the start of the measurement, the tip of the measuring head 10 is moved away from the starting end of the sealing surface 2 of the special threaded connector 1, making it easier for the scale 9 to drive the measuring head 10 to move to the left.

[0040] After the stop block 13 separates from the upper baffle 6, the tip of the lower end of the measuring head 10 can contact the sealing surface 2 of the special threaded joint 1 under the elastic force of the tension spring 12, which facilitates the subsequent alignment of the tip of the measuring head 10 with the stop end of the sealing surface 2 of the special threaded joint 1.

[0041] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A measuring tool for the sealing surface length of a special threaded joint in an oil casing pipe, comprising an upper baffle (6) and a lower baffle (3), characterized in that, The upper baffle (6) and the lower baffle (3) are elastically slidably connected. The end faces of the upper baffle (6) and the lower baffle (3) opposite to the special threaded joint (1) are flush. A stop bar (4) is fixed on the end faces of the upper baffle (6) and the lower baffle (3) opposite to the special threaded joint (1). A groove (11) is provided on the end face of the upper baffle (6) facing the special threaded joint (1). The length direction of the groove (11) is parallel to the radial direction of the special threaded joint (1). A scale (9) is slidably provided on the upper baffle (6) along the axial direction of the special threaded joint (1). The scale (9) passes through the upper baffle (6) and the groove (11). The scale (9) is perpendicular to the upper baffle (6). The scale (9) is slidably provided on the side facing the special threaded joint (1). There is a measuring head (10). The sliding direction of the measuring head (10) is parallel to the radial direction of the special threaded joint (1). The measuring head (10) is perpendicular to the scale (9). The upper end of the measuring head (10) is elastically connected to the scale (9). The lower end of the measuring head (10) is a pointed tip. The measuring head (10) can enter the groove (11). When the measuring head (10) enters the groove (11) and presses against the upper baffle (6), the pointed tip of the lower end of the measuring head (10) is flush with the end face of the upper baffle (6) facing the special threaded joint (1). After the pointed tip of the lower end of the measuring head (10) is flush with the end face of the upper baffle (6) facing the special threaded joint (1), the zero mark on the scale (9) is flush with the end of the upper baffle (6) away from the special threaded joint (1).

2. The tool for measuring the length of the sealing surface of a special threaded joint for oil casing as described in claim 1, characterized in that, The upper baffle (6) and the lower baffle (3) can slide relative to each other in the radial direction of the special threaded joint (1). The upper baffle (6) and the lower baffle (3) are arranged vertically. A square hole is opened in the lower part of the upper baffle (6). A square rod (7) is slidably arranged in the square hole. The lower end of the square rod (7) is fixedly connected to the upper end of the lower baffle (3). The upper end of the square rod (7) is connected to the upper baffle (6) through a spring (8). The spring (8) is located in the square hole.

3. The tool for measuring the length of the sealing surface of a special threaded joint for oil casing as described in claim 2, characterized in that, The upper end of the spring (8) is fixedly connected to the upper baffle (6), and the lower end of the spring (8) is fixedly connected to the upper end of the square rod (7).

4. The tool for measuring the length of the sealing surface of a special threaded joint for oil casing as described in claim 1, characterized in that, Each of the stop bars (4) is embedded with a magnet (5), and the axial direction of the stop bar (4) is parallel to the axial direction of the special threaded joint (1).

5. The tool for measuring the length of the sealing surface of a special threaded joint for oil casing as described in claim 1, characterized in that, The upper end of the measuring head (10) is connected to the scale (9) via a tension spring (12). A stop block (13) is fixed on the side of the upper end of the measuring head (10) facing the upper baffle (6). The cross-section of the measuring head (10) is rectangular.

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