Double-shoulder thread length measuring tool for drilling tool

Abstract

The utility model discloses a double-shoulder thread length measuring tool for a drilling tool, and belongs to the technical field of thread measurement. The device comprises a measuring rod, the outer wall surface of one end of the measuring rod is provided with threads, and the outer wall surface of the other end of the measuring rod is provided with scale marks; a locking block is in threaded connection with the portion, provided with the threads, of the measuring rod. A contact is fixedly connected to the top of the end, provided with the threads, of the measuring rod. The end, close to the scale marks, of the locking block is connected with a measuring block, and a through hole coaxial with the measuring rod is formed in the measuring block and used for allowing the measuring rod to penetrate through. When in use, the locking block is in close contact with the main sealing surface of the double-shoulder thread, the measuring rod and the contact are rotated to move axially, and after the contact is in close contact with the auxiliary shoulder of the double-shoulder thread, the overlapped numerical value on the scale marks of the measuring block and the measuring rod is read to complete the measurement of the thread length. The contact surface between the contact and the double-shoulder thread pair shoulder is larger, the axial force applied by the thread is more stable, and the manual measurement error can be reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of thread measurement and relates to a drilling tool double-shoulder thread length measuring tool. Background Art

[0002] In the harsh environment of oil exploration and production, the performance and safety of drill tools are crucial. As one of the key technologies to enhance the torsional strength of drill tool joints, the precision and quality control of double shoulder threads cannot be ignored. At present, the measurement of the length of double shoulder thread products mainly relies on the traditional depth gauge, which is simple and easy to use, but faces many challenges in actual operation. Specifically, due to the complexity of the thread structure of the drill tool and the variability of the working environment, it is difficult for the depth gauge to ensure absolute vertical and close contact with the thread end face during measurement, which directly leads to the instability and large error of the measurement results. This error may not only mislead the evaluation of the quality of the double shoulder thread products, but more seriously, it may affect the connection stability and sealing of the drill tool under extreme working conditions. Once the sealing surface is not tightly matched, it is very easy to cause leakage or even thread breakage under high pressure, high temperature or high torque conditions, which will cause catastrophic accidents such as the drill tool falling into the well, bringing huge economic losses and safety risks to the exploration operation. Therefore, improving the measurement accuracy of double shoulder thread length and developing or introducing more accurate and efficient measurement tools and technologies have become key issues that need to be urgently addressed in the oil drilling tool manufacturing industry. This is not only related to improving product quality, but also an important part of ensuring drilling safety and improving exploration efficiency.

[0003] A Chinese patent with announcement number CN209512705U discloses a device for measuring the length of an internal thread, which includes a working platform, a column, a detection mechanism, etc. However, the device for measuring the length of an internal thread requires the parts to be placed on a working platform, and is only suitable for small threaded parts. For large-sized oil pipe threads used in drilling projects, the measuring device needs to be small and movable, and the device for measuring the length of an internal thread cannot perform measurement. Utility Model Content

[0004] The utility model aims to solve the technical problem of large measurement error of a double-shoulder thread measuring tool for drilling tools in the prior art, and provides a double-shoulder thread length measuring tool for drilling tools.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] In a first aspect, the present utility model provides a measuring tool for the length of a double shoulder thread of a drill tool, including a measuring rod. A thread is provided on the outer wall surface of one end of the measuring rod, and a scale line is provided on the outer wall surface of the other end. A locking block is threadedly connected to the part of the measuring rod where the thread is provided. A contact head is fixedly connected to the top of the end of the measuring rod where the thread is provided. A measuring block is connected to one end of the locking block close to the scale line. A through hole coaxial with the measuring rod is provided on the measuring block for the measuring rod to pass through.

[0007] A further improvement of the present utility model lies in:

[0008] The thread is a trapezoidal thread.

[0009] An extension rod is radially provided on the locking block.

[0010] An extension rod is radially clamped on the locking block, and the extension rod is of a rectangular structure.

[0011] A positioning block is fixedly connected to the top of the end of the measuring rod where the scale line is provided.

[0012] The contact head, the measuring rod, the locking block, the extension rod and the positioning block are all made of stainless steel.

[0013] The top of the end of the measuring rod where the scale line is provided is threadedly connected to the positioning block through a triangular thread.

[0014] The positioning block is of a polygonal structure.

[0015] The top of the end of the measuring rod where the thread is provided is threadedly connected to the contact head through a trapezoidal thread.

[0016] One end of the locking block close to the scale line is threadedly connected to the measuring block.

[0017] Compared with the prior art, the present utility model has the following beneficial effects:

[0018] The present utility model discloses a measuring tool for the length of a double shoulder thread of a drill tool, including a measuring rod. A thread is provided on the outer wall surface of one end of the measuring rod, and a scale line is provided on the outer wall surface of the other end. A locking block is threadedly connected to the part of the measuring rod where the thread is provided. A contact head is fixedly connected to the top of the end of the measuring rod where the thread is provided. A measuring block is connected to one end of the locking block close to the scale line. A through hole coaxial with the measuring rod is provided on the measuring block. When in use, the locking block is closely contacted with the main sealing surface of the double shoulder thread. The measuring rod and the contact head are rotated and axially moved. After the contact head is closely contacted with the secondary shoulder of the double shoulder thread, the value coinciding on the scale line between the measuring block and the measuring rod is read to complete the measurement of the thread length. The contact surface between the contact head and the secondary shoulder of the double shoulder thread is larger and more stable, which can reduce the manual measurement error.

[0019] Further, the thread on the measuring rod is a trapezoidal thread, and the measuring rod is movably connected to the locking block through the trapezoidal thread, ensuring the stability of the left - right movement of the locking block and efficient force transmission.

[0020] Further, a rectangular extension rod is radially arranged on the locking block. During measurement, the extension rod is in close contact with the double - shoulder thread main sealing surface, making the contact between the present utility model and the drill tool more stable and the measurement accuracy higher.

[0021] Further, at the top of the end of the measuring rod where the scale line is set, a positioning block with a polygonal structure is fixedly connected. During measurement, the measuring rod and the contact head are axially moved by rotating the positioning block, which is labor - saving and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0023] Figure 1 FIG. is a schematic structural diagram of a measuring tool for the length of the double - shoulder thread of a drill tool in an embodiment of the present utility model;

[0024] Figure 2 FIG. is a measurement schematic diagram of a measuring tool for the length of the double - shoulder thread of a drill tool in an embodiment of the present utility model.

[0025] Wherein: 1 - contact head; 2 - measuring rod; 3 - locking block; 4 - extension rod; 5 - measuring block; 6 - positioning block. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] In order to make the purposes, technical solutions, and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the present utility model to be protected, but only represents the selected embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0028] It should be noted that like reference numerals and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it will not be necessary to further define and explain it in subsequent figures.

[0029] In the description of the embodiments of the present utility model, it should be noted that if terms such as "upper", "lower", "horizontal", "inner", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship in which the product of the present utility model is customarily placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, terms such as "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0030] In addition, if the term "horizontal" appears, it does not mean that the component is required to be absolutely horizontal, but it can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but it can be slightly inclined.

[0031] In the description of the embodiments of the present utility model, it should also be noted that unless otherwise clearly specified and limited, if terms such as "set", "installed", "connected", "coupled" are used, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0032] The following further describes the present utility model in detail with reference to the figures:

[0033] Embodiment 1

[0034] See Figure 1, an embodiment of the utility model discloses a measuring tool for the length of the double shoulder thread of a drill tool, which includes a measuring rod 2. A thread is provided on the outer wall surface of one end of the measuring rod 2, and the thread is a trapezoidal thread. A scale line is provided on the outer wall surface of the other end. A positioning block 6 is fixedly connected to the top of the end of the measuring rod 2 where the scale line is provided. The top of the end of the measuring rod 2 where the scale line is provided is connected to the positioning block 6 through a triangular thread. The positioning block 6 is a hexagonal structure. During measurement, the measuring rod and the contact head are driven to axially move by rotating the positioning block, which is labor-saving and convenient; A locking block 3 is threadedly connected to the part of the measuring rod 2 where the thread is provided. One end of the locking block 3 close to the scale line is threadedly connected to a measuring block 5. A contact head 1 is fixedly connected to the top of the end of the measuring rod 2 where the thread is provided. The top of the end of the measuring rod 2 where the thread is provided is connected to the contact head 1 through a trapezoidal thread. The measuring rod and the locking block are movably connected through a trapezoidal thread to ensure the stability of the left and right movement with the locking block and efficient force transmission; One end of the locking block 3 close to the scale line is connected to a measuring block 5. A through hole coaxial with the measuring rod 2 is provided on the measuring block 5 for the measuring rod 2 to pass through. A lengthening rod 4 is radially clamped on the locking block 3. The lengthening rod 4 is a rectangular structure. A convex groove is provided at one end of the lengthening rod 4. The lengthening rod is connected to the locking block 3 through a groove, and the end surface of the lengthening rod is flush with the locking block. The length of the lengthening rod can be adjusted according to the threaded hole diameter of the drill tool to be measured. The materials of the contact head 1, the measuring rod 2, the locking block 3, the lengthening rod 4 and the positioning block 6 are stainless steel. For example, GCr15 steel can be used to provide wear resistance and corrosion resistance. Isothermal spheroidizing annealing is adopted for preliminary heat treatment, and quenching + low-temperature tempering is adopted for final heat treatment. During use, the lengthening rod 4 is closely contacted with the main sealing surface of the double shoulder thread. The positioning block 6 is rotated to drive the measuring rod 2 and the contact head 1 to axially move. After the contact head 1 is closely contacted with the secondary shoulder of the double shoulder thread pair, the value coinciding with the scale line on the measuring block 5 and the measuring rod 2 is read to complete the measurement of the thread length. It solves the problem that when measuring the length of the double shoulder thread of a drill tool, the measuring tool is not closely contacted with the secondary shoulder, reducing the measurement error; The structure is simple and the design is scientific and reasonable. The measuring tool in the utility model only needs to be regularly self-calibrated with a vernier caliper. During use, the length value of the double shoulder thread finished product can be measured by one person.

[0035] Example 2

[0036] See Figure 1, an embodiment of the present utility model discloses a measuring tool for the length of the double shoulder thread of a drill string, including a measuring rod 2. One end of the outer wall of the measuring rod 2 is provided with a thread, and the thread is a trapezoidal thread. The other end of the outer wall is provided with scale lines. A locking block 3 is threadedly connected to the part of the measuring rod 2 where the thread is provided. One end of the locking block 3 close to the scale line is threadedly connected to a measuring block 5. One end of the top of the measuring rod 2 where the thread is provided is fixedly connected with a contact head 1. One end of the top of the measuring rod 2 where the thread is provided is threadedly connected to the contact head 1 through a trapezoidal thread. The measuring rod and the locking block are movably connected through a trapezoidal thread to ensure the stability of the left and right movement of the locking block and efficient force transmission. One end of the locking block 3 close to the scale line is connected to a measuring block 5. The measuring block 5 is provided with a through hole coaxial with the measuring rod 2 for the measuring rod 2 to pass through. The materials of the contact head 1, the measuring rod 2, the locking block 3 are stainless steel. For example, GCr15 steel can be used to provide wear resistance and corrosion resistance. Isothermal spheroidizing annealing is used for preliminary heat treatment, and quenching + low-temperature tempering is used for final heat treatment. When in use, the contact head 1 is in close contact with the shoulder of the double shoulder thread pair. Rotate the locking block 3 to drive the measuring block 5 to move axially. After the locking block 3 is in close contact with the main sealing surface of the double shoulder thread, read the value that coincides with the scale line on the measuring block 5 and the measuring rod 2 to complete the measurement of the thread length. The contact surface between the contact head 1 and the shoulder of the double shoulder thread pair is larger and more stable, which can reduce the manual measurement error.

[0037] The working process of the present utility model is as follows:

[0038] See Figure 2 , when the present utility model is in use, the extension rod 4 is in close contact with the main sealing surface of the double shoulder thread. Rotate the positioning block 6 to drive the measuring rod 2 and the contact head 1 to move axially. After the contact head 1 is in close contact with the shoulder of the double shoulder thread pair, read the value that coincides with the scale line on the measuring block 5 and the measuring rod 2 to complete the measurement of the thread length. It solves the problem that when measuring the length of the double shoulder thread of the drill string, the measuring tool is not in close contact with the secondary shoulder, reducing the measurement error; the structure is simple and the design is scientific and reasonable. The measuring tool in the present utility model only needs to be calibrated regularly with a vernier caliper. When in use, one person can measure the length value of the double shoulder thread finished product.

[0039] The above is only the preferred embodiment of the present utility model and is not used to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A drilling tool double shoulder thread length measuring tool, characterized in that: The invention comprises a measuring rod (2), wherein a thread is arranged on the outer wall surface of one end of the measuring rod (2), and a scale line is arranged on the outer wall surface of the other end; a locking block (3) is threadedly connected to the portion of the measuring rod (2) where the thread is arranged, and a contact (1) is fixedly connected to the top of the end where the thread is arranged on the measuring rod (2); a measuring block (5) is connected to the end of the locking block (3) close to the scale line, and a through hole coaxial with the measuring rod (2) is arranged on the measuring block (5) for the measuring rod (2) to pass through.

2. The double shoulder thread length measuring tool for drilling tools according to claim 1, characterized in that: The thread is a trapezoidal thread.

3. The double shoulder thread length measuring tool for drilling tools according to claim 1, characterized in that: An extension rod (4) is arranged radially on the locking block (3).

4. The double shoulder thread length measuring tool for drilling tools according to claim 3, characterized in that: The locking block (3) is radially clamped with an extension rod (4), and the extension rod (4) is a rectangular structure.

5. The double shoulder thread length measuring tool for drilling tools according to claim 3, characterized in that: A positioning block (6) is fixedly connected to the top of one end of the measuring rod (2) on which the scale line is arranged.

6. The drilling tool double shoulder thread length measuring tool according to claim 5, characterized in that: The contact (1), measuring rod (2), locking block (3), extension rod (4) and positioning block (6) are all made of stainless steel.

7. The double shoulder thread length measuring tool for drilling tools according to claim 5, characterized in that: The top of one end of the measuring rod (2) provided with a scale line is connected to the positioning block (6) through a triangular thread.

8. The drilling tool double shoulder thread length measuring tool according to claim 5, characterized in that: The positioning block (6) is a polygonal structure.

9. The drilling tool double shoulder thread length measuring tool according to claim 1, characterized in that: The top of one end of the measuring rod (2) provided with a thread is connected to the contact (1) via a trapezoidal thread.

10. The drilling tool double shoulder thread length measuring tool according to claim 1, characterized in that: One end of the locking block (3) close to the scale line is connected to the measuring block (5) via a thread.

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