A device for measuring breakout torque on a pipe string

Abstract

The present invention relates to the technical field of pipe string torque detection, specifically a pipe string breakout torque measuring device, comprising a support base assembly, a continuous forward and reverse rotation assembly, and a passive clamping assembly; the passive clamping assembly comprises a connecting fixed plate and a clamping mechanism assembly, wherein a first through hole is provided in the middle of the connecting fixed plate, and a slide groove is provided on both the left and right sides thereof, wherein a weighing sensor is slidably arranged in the slide groove; the clamping mechanism assembly comprises a clamping mounting plate, which is rotatably connected to the connecting fixed plate, and a limited slot is provided on both the left and right sides thereof, and the limited slot is arranged at a certain angle to the radial direction of the clamping mounting plate, and the weighing sensor is provided with a pressure head, which extends to the limited slot and slides and rotates in the limited slot; a spring is squeezed between the weighing sensor and the slide groove. In the present invention, when the torque generated by the passive clamping assembly is too large, the weighing sensor can slide outward along the slide groove to increase the force arm and reduce the load, thereby preventing the weighing sensor from being overloaded or even damaged.

Description

Technical Field

[0001] The present invention relates to the technical field of pipe string torque detection, in particular to a pipe string breakout torque measuring device. Background Art

[0002] In oil operations, a large number of operations require threading and breaking of pipe strings, such as oil, casing, drill pipe, drilling tools, and coiled tubing. Existing equipment mostly uses the balanced force method, that is, there is an equal and opposite reaction torque on the body of the rotating machinery. The corresponding torque is obtained by measuring the reaction torque.

[0003] In the prior art, torque is usually applied manually to the breakout using a torque wrench. Since the direction of force applied cannot be guaranteed to be perpendicular to the lever arm at all times, the non-tangential force seriously interferes with the true value of the torque, resulting in inaccurate measurement values ​​and low reliability.

[0004] The invention patent application filed by the applicant, with publication number CN119827032A, discloses a device and method for measuring make-up and break-out torque. The device comprises a first load cell and a second load cell whose measuring axes are fixedly connected perpendicularly to the clamping mechanism assembly. This ensures that the torque measured by the first and second load cells is always perpendicular to the lever arm, reducing the interference of non-tangential forces on the true value of the torque, thereby improving the accuracy of the torque measurement. However, the load cells and their measuring axes in this device are both fixedly connected, with a fixed lever arm and a limited rated load. When the torque generated by the passive clamping assembly is excessive, the load cells can easily overload or even be damaged, requiring replacement and affecting the torque detection process. Summary of the Invention

[0005] The object of the present invention is to provide a device for measuring the breakout torque on a pipe string to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions: a device for measuring the breakout torque on a pipe string, comprising:

[0007] Support base assembly;

[0008] a continuous forward and reverse rotation assembly, which is arranged at the rear end of the support base assembly and is used to clamp the internally threaded pipe column and make the internally threaded pipe column continuously rotate forward and reverse; and

[0009] A passive clamping assembly is provided at the front end of the support base assembly for clamping the external threaded pipe column; the passive clamping assembly includes

[0010] A connecting fixing plate, wherein a first through hole for passing the externally threaded pipe column is formed in the middle thereof, and radially distributed and horizontal chute is formed on both the left and right sides thereof, wherein a weighing sensor is slidably arranged and installed in the chute, wherein the axis of the weighing sensor is distributed in the front-to-back direction, and the weighing sensor is connected to the host computer; and

[0011] The clamping mechanism assembly is rotatably connected to the rear side wall of the connecting and fixing plate; the clamping mechanism assembly includes

[0012] The clamping mounting plate is rotatably connected to the rear side wall of the connecting and fixing plate, and has limited long grooves on both sides thereof, the limited long grooves corresponding to the slide grooves one by one, and the limited long grooves are arranged at a certain angle to the radial direction of the clamping mounting plate, and the weighing sensor is provided with a pressure head, which extends to the limited long grooves and slides and rotates with the limited long grooves; when the clamping mounting plate rotates within a certain angle range relative to the connecting and fixing plate, the limited long grooves limit the movement trajectory of the weighing sensor;

[0013] A spring is squeezed between the side of the weighing sensor that is away from each other and the slide groove, and when the weighing sensor is close to being overloaded, the spring begins to compress;

[0014] A pressure sensor is provided on one side of the chute away from each other, the spring is pressed against the pressure sensor, and the pressure sensor is connected to the host computer;

[0015] The pressure value of the pressure sensor is obtained in real time through the host computer to understand the real-time compression of the spring. The specific position of the weighing sensor and the size of the force arm corresponding to the position of the weighing sensor are obtained according to the pressure value. Combined with the shear value of the weighing sensor, the corresponding dynamic torque value is calculated.

[0016] Optionally, it also includes a slider mounting portion, which is composed of a slider portion and a bracket plate connected to the slider portion. The slider portion is slidably arranged in the slide groove, a second through hole is opened on the slider portion, the weighing sensor is fixedly mounted on the bracket plate, and the pressure head is arranged through the second through hole.

[0017] Optionally, a telescopic rod is connected between the side of the slider portion that is away from each other and the sliding groove, and the spring is sleeved on the telescopic rod.

[0018] Optionally, a limiting column is provided in the limiting long groove for sliding and rotating, and a third through hole is opened in the axial direction of the limiting column, the pressure head extends into the third through hole and the load direction of the pressure head is arranged perpendicular to the radial direction of the clamping mounting plate, and a force transmission component is provided between the two sides of the rear end of the pressure head along the load direction and the inner wall of the third through hole, and the force transmission component includes a pressure-bearing base, a pressure-bearing steel ball and a steel ball pressure head, the rear end of the pressure head is threadedly connected to a connecting bolt, the pressure-bearing base is threadedly connected to the connecting bolt, and the steel ball pressure head is fixedly connected to the inner wall of the third through hole, and the pressure-bearing steel ball is gap-arranged between the pressure-bearing base and the steel ball pressure head.

[0019] Optionally, limiting portions are connected to the inner wall of the third through hole and are located on both sides of the front end of the pressure head along the vertical load direction, and the limiting portions are gap-matched with the side walls of the pressure head.

[0020] Optionally, the clamping mechanism assembly includes a first clamping hydraulic cylinder, a plurality of which are fixedly connected to the clamping mounting plate, and the continuous forward and reverse assembly includes a plurality of second clamping hydraulic cylinders; the output ends of the first and second clamping hydraulic cylinders are both connected to clamping blocks, the end faces of which are connected to sawtooth blocks; and the first and second clamping hydraulic cylinders are both connected to a host computer. Optionally, the load cell is a shear beam load cell.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The present invention provides a chute on the connecting plate and a limit slot on the clamping plate. A load cell is slidably mounted within the chute, and the pressure head and the limit slot are configured to slide and rotate. When the torque generated by the passive clamping assembly is excessive, the load cell slides outward along the chute to increase the lever arm and reduce the load, thus preventing the load cell from being overloaded or even damaged.

[0023] 2. The present invention provides a spring between the load cell and the chute to apply a preload force to the load cell, ensuring a fixed position and stable measurement. A pressure sensor is provided between the spring and the chute. The pressure reading from the pressure sensor can be used to calculate the spring compression degree and the load cell position, thereby calculating the dynamic force arm and dynamic torque of the load cell when it slides outward.

[0024] 3. The present invention sets a limit column between the pressure head and the limit long groove, and sets a force transmission component and a limit part between the limit column and the pressure head. The force transmission component can be adjusted to transmit the force of the limit long groove on the limit column to the weighing sensor in the vertical direction, and at the same time transmit the force of the limit long groove on the limit column in the horizontal direction so that the weighing sensor has a tendency to adjust the force arm. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the breakout torque measuring device on a pipe string according to the present invention;

[0026] Figure 2 is a schematic diagram of the passive clamping assembly of the present invention;

[0027] Figure 3 for Figure 2 Enlarged view of part A in the middle;

[0028] Figure 4 A schematic diagram of the passive clamping assembly of the present invention without the connecting fixing plate;

[0029] Figure 5 for Figure 4 Enlarged view of middle part B;

[0030] Figure 6 for Figure 5 Cross-sectional view of the middle CC section;

[0031] Figure 7 Schematic diagram of the first clamping hydraulic cylinder in the passive clamping assembly of the present invention;

[0032] Figure 8 This is an electrical connection diagram of the breakout torque measuring device on a pipe string according to the present invention.

[0033] Figure: 10, continuous forward and reverse rotation assembly; 101, second clamping hydraulic cylinder; 20, passive clamping assembly; 21, connecting fixing plate; 211, first through hole; 212, slide groove; 213, slider mounting portion; 2131, slider portion; 2132, bracket plate; 2133, second through hole; 214, weighing sensor; 2141, pressure head; 2142, connecting bolt; 215, telescopic rod; 216, spring Spring; 217, pressure sensor; 22, clamping mounting plate; 221, limiting long groove; 222, limiting column; 2221, third through hole; 2222, limiting part; 223, force transmission component; 2231, pressure base; 2232, pressure steel ball; 2233, steel ball pressure head; 224, first clamping hydraulic cylinder; 225, clamping block; 226, serrated block; 30, support base assembly; 40, upper computer. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] Figure 1 Schematic diagram of the breakout torque measuring device on a pipe string according to the present invention; Figure 2 is a schematic diagram of the passive clamping assembly 20 of the present invention; Figure 3 for Figure 2 The enlarged view of the middle A part, Figure 8 This is an electrical connection diagram of the breakout torque measuring device on a pipe string according to the present invention.

[0036] See also Figure 1-3 as well as Figure 8 As shown, an embodiment of the present invention provides a device for measuring the breakout torque on a pipe string, comprising a support base assembly 30, a continuous forward and reverse assembly 10, and a passive clamping assembly 20.

[0037] The continuous forward and reverse rotation assembly 10 is slidably and transmission-drivenly arranged at the rear end of the support base assembly 30, and is used to adjust its position on the support base assembly 30 and clamp the internally threaded pipe column, and make the internally threaded pipe column continuously rotate forward / reverse;

[0038] The passive clamping assembly 20 is slidably and transmission-disposed at the front end of the support base assembly 30, and is used to adjust its position on the support base assembly 30 and clamp the external threaded pipe column so that the external threaded pipe column has a tendency to follow the rotation when the internal threaded pipe column continuously rotates.

[0039] Specifically, the passive clamping assembly 20 includes a connecting fixing plate 21 and a clamping mechanism assembly rotatably connected to the rear side wall of the connecting fixing plate 21.

[0040] A first through-hole 211 is defined in the center of the connecting plate 21 for the externally threaded pipe to pass through. Radially distributed and horizontal chutes 212 are defined on both sides of the connecting plate 211. Load cells 214, which are shear beam type load cells, are slidably mounted within these chutes. The axis of the load cells 214 is aligned in the front-to-back direction, and the load cells 214 are connected to the host computer 40.

[0041] The clamping mechanism assembly includes a clamping mounting plate 22, which is rotatably connected to the rear side wall of the connecting and fixing plate 21, and a limited long groove 221 is provided on both sides of the clamping mounting plate 22. The limited long groove 221 corresponds to the slide groove 212 one by one, and the limited long groove 221 is set at a certain angle to the radial direction of the clamping mounting plate 22. The weighing sensor 214 is provided with a pressure head 2141, which extends to the limited long groove 221 and slides and rotates with the limited long groove 221; when the clamping mounting plate 22 rotates relative to the connecting and fixing plate 21 within a certain angle range, the limited long groove 221 limits the moving trajectory of the weighing sensor 214. This action process can refer to the principle of aperture adjustment, wherein the shape of the limited long groove 221 can be set to be linear or arc-shaped, and its specific shape and the extreme positions at both ends can also be designed according to actual needs.

[0042] Finally, a spring 216 is squeezed between the side of the load cell 214 that faces away from each other and the chute 212. When the load cell 214 approaches overload, the spring 216 begins to compress. This spring 216 applies a preload force to the load cell 214, ensuring that the load cell 214 is initially fixed at the adjacent end of the two chute 212 within a certain torque range, ensuring stable measurement within this range.

[0043] The device for measuring the breakout torque of the pipe column of the present invention further includes a slider mounting portion 213, which is composed of a slider portion 2131 and a bracket plate 2132 connected to the slider portion 2131. The slider portion 2131 is slidably arranged in the slide groove 212, and a second through hole 2133 is provided on the slider portion 2131. The weighing sensor 214 is fixedly mounted on the bracket plate 2132, and the pressure head 2141 is provided through the second through hole 2133.

[0044] Furthermore, a telescopic rod 215 is connected between the side of the slider portion 2131 that is away from each other and the slide groove 212. The spring 216 is arranged between the slider portion 2131 and the slide groove 212 and is sleeved on the telescopic rod 215. The telescopic rod 215 is a rod with low resistance and can be freely extended and retracted. The spring 216 is sleeved on the telescopic rod 215 to improve the stability of the position of the spring 216.

[0045] Furthermore, a pressure sensor 217 is provided on the side of the slideway 212 that faces away from each other. The spring 216 is pressed against the pressure sensor 217, and the pressure sensor 217 is connected to the host computer 40. The pressure sensor 217 is a dynamic pressure sensor 217. The host computer 40 can obtain the pressure value of the pressure sensor 217 in real time, thereby understanding the real-time compression of the spring 216. The specific position of the slider 2131 (i.e., the load cell 214) and the magnitude of the lever arm corresponding to the position of the slider 2131 (i.e., the position of the load cell 214) can be determined based on the pressure value. Combined with the shear value of the load cell 214, the corresponding dynamic torque value can be calculated.

[0046] Taking the dynamic torque calculation of a single load cell 214 as an example, before the slider 2131 slides, the initial lever arm corresponding to the load cell 214 is R0, and the initial pressure value detected by the pressure sensor 217 is F0. After the slider 2131 slides, the real-time shear value detected by the load cell 214 is T, and the real-time pressure value detected by the pressure sensor 217 is FN. Therefore, the real-time compression of the spring is ΔX = (FN - F0) / K (K is the spring constant). Therefore, the lever arm corresponding to the position of the load cell 214 is R = R0 + ΔX = R0 + (FN - F0) / K. The dynamic torque corresponding to this position of the load cell is M = ΤR = Τ[R0 + (FN - F0) / K]. Therefore, the dynamic torque of the breakout torque measurement device on the pipe string is the sum of the dynamic torques detected by the two load cells 214.

[0047] Figure 4 This is a schematic diagram of the passive clamping assembly 20 of the present invention without the connecting fixing plate 21; Figure 5 for Figure 4 Enlarged view of middle part B; Figure 6 for Figure 5 Cross-sectional view of the middle CC section;

[0048] See also Figure 4-6As shown, on the basis of the above embodiment, a limiting column 222 is slidingly and rotatably arranged in the limiting long groove 221, and a third through hole 2221 is opened in the axial direction of the limiting column 222, and the pressure head 2141 extends into the third through hole 2221 and the load direction of the pressure head 2141 is perpendicular to the radial direction of the clamping mounting plate 22, and a force transmission component 223 is provided between the two sides of the rear end of the pressure head 2141 along the load direction and the inner wall of the third through hole 2221, and the force transmission component 223 includes a pressure-bearing base 2231, a pressure-bearing steel ball 2232 and a steel ball pressure head 2233, and the rear end of the pressure head 2141 is threadedly connected to a connecting bolt 2142, and the pressure-bearing base 2231 is threadedly connected to the connecting bolt 2142, and the steel ball pressure head 2233 is fixedly connected to the inner wall of the third through hole 2221, and the pressure-bearing steel ball 2232 is gap-arranged between the pressure-bearing base 2231 and the steel ball pressure head 2233. Limiting portions 2222 are connected to the inner wall of the third through hole 2221 and are located on both sides of the front end of the pressing head 2141 along the vertical load direction. The limiting portions 2222 are clearance-matched with the side walls of the pressing head 2141 .

[0049] The force transmission assembly 223 is automatically alignable. Since the limiting slot 221 is arranged in a non-radial direction, the force exerted by the limiting slot 221 on the limiting post 222 also forms a certain angle with the radial direction. The pressure-bearing steel ball 2232 can align the force exerted by the limiting slot 221 on the limiting post 222 to the vertical direction and transmit it to the load cell 214. At the same time, the force exerted by the limiting slot 221 on the limiting post 222 can act on the load cell 214 in the horizontal direction, so that the load cell 214 has a tendency to adjust the force arm. When acting in the horizontal direction, the force can be transmitted through the limiting portion 2222. Since the limiting portion 2222 is located at the front end of the pressure head 2141, closer to the center of gravity of the load cell 214, it can prevent the pressure head 2141 from being subjected to a large deformation in the vertical load direction and affecting the measurement accuracy of the pressure head 2141. On the other hand, it can make the sliding portion 2131 slide more smoothly.

[0050] In this embodiment, force transmission assemblies 223 are provided on both the upper and lower surfaces of the pressure head 2141. Therefore, when the continuous forward and reverse rotation assembly 10 rotates forward (clockwise), the clamping mounting plate 22 can transmit and measure torque through the force transmission assembly 223 located below (using the left side as an example); when the continuous forward and reverse rotation assembly 10 rotates reverse (counterclockwise), the clamping mounting plate 22 can transmit and measure torque through the force transmission assembly 223 located above (using the left side as an example). The clearance fit between the pressure-bearing steel ball 2232, the pressure-bearing base 2231, and the steel ball pressure head 2233 provides a certain deformation space for the pressure head 2141 to deform slightly when it is loaded. The clearance fit between the limiter 2222 and the side wall of the pressure head 2141 can reduce the resistance to the slight deformation of the pressure head 2141 when it is loaded.

[0051] Figure 7Schematic diagram of the first clamping hydraulic cylinder 224 in the passive clamping assembly 20 of the present invention;

[0052] See also Figure 7 and Figure 8 As shown, based on the above embodiment, the clamping mechanism assembly includes a first clamping hydraulic cylinder 224, multiple of which are fixedly connected to the clamping mounting plate 22. The continuous forward and reverse assembly 10 includes multiple second clamping hydraulic cylinders 101 (the arrangement of which can be referred to as the first clamping hydraulic cylinder 224). The output ends of the first clamping hydraulic cylinder 224 and the output ends of the second clamping hydraulic cylinder 101 are both connected to a clamping block 225, and the end face of the clamping block 225 is connected to a serrated block 226. Both the first clamping hydraulic cylinder 224 and the second clamping hydraulic cylinder 101 are connected to the host computer 40, which controls the clamping state of the internally and externally threaded pipe strings.

[0053] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A device for measuring breakout torque on a pipe string, characterized by: include Support base assembly (30); A continuous forward and reverse rotation assembly (10), which is arranged at the rear end of the support base assembly (30) and is used to clamp the internal threaded pipe column and enable the internal threaded pipe column to continuously rotate forward and reverse; and A passive clamping assembly (20) is provided at the front end of the support base assembly (30) and is used for clamping the external threaded pipe column; the passive clamping assembly (20) includes A connecting fixing plate (21) is provided with a first through hole (211) for passing an externally threaded pipe column in the middle thereof, and radially distributed and horizontal sliding grooves (212) are provided on both the left and right sides thereof, wherein a weighing sensor (214) is slidably arranged and installed in the sliding groove (212), wherein the axis of the weighing sensor (214) is distributed in the front-back direction, and the weighing sensor (214) is connected to the host computer (40); and A clamping mechanism assembly is rotatably connected to the rear side wall of the connecting and fixing plate (21); the clamping mechanism assembly includes The clamping mounting plate (22) is rotatably connected to the rear side wall of the connecting and fixing plate (21), and a limited long groove (221) is provided on both the left and right sides of the clamping mounting plate (22), wherein the limited long groove (221) corresponds to the slide groove (212) one by one, and the limited long groove (221) is arranged at a certain angle to the radial direction of the clamping mounting plate (22), and the weighing sensor (214) is provided with a pressure head (2141), and the pressure head (2141) extends to the limited long groove (221) and is slidably and rotatably arranged with the limited long groove (221); when the clamping mounting plate (22) rotates within a certain angle range relative to the connecting and fixing plate (21), the limited long groove (221) limits the moving track of the weighing sensor (214); A spring (216) is squeezed between the side of the weighing sensor (214) that is away from each other and the slide groove (212), and when the weighing sensor (214) is close to being overloaded, the spring (216) begins to compress; A pressure sensor (217) is provided on one side of the slide groove (212) away from each other, the spring (216) is pressed against the pressure sensor (217), and the pressure sensor (217) is connected to the host computer (40); The pressure value FN of the pressure sensor (217) is obtained in real time through the host computer (40), and the real-time compression condition of the spring (216) ΔX=(FN-F0) / K (K is the spring constant, and F0 is the initial pressure value) is understood. According to the pressure value, the specific position of the weighing sensor (214) and the force arm size R=R0+ΔX=R0+(FN-F0) / K (R0 is the initial force arm) corresponding to the position of the weighing sensor (214) are obtained. Combined with the shear value T of the weighing sensor (214), the corresponding dynamic torque value M=ΤR=Τ[R0+(FN-F0) / K] is calculated.

2. The device for measuring breakout torque on a pipe string according to claim 1, characterized in that: The invention also includes a slider mounting portion (213), wherein the slider mounting portion (213) is composed of a slider portion (2131) and a bracket plate (2132) connected to the slider portion (2131), wherein the slider portion (2131) is slidably arranged in the slide groove (212), and a second through hole (2133) is provided on the slider portion (2131), and the weighing sensor (214) is fixedly mounted on the bracket plate (2132), and the pressure head (2141) is provided through the second through hole (2133).

3. The device for measuring breakout torque on a pipe string according to claim 2, characterized in that: A telescopic rod (215) is connected between the side of the slider portion (2131) that is away from each other and the slide groove (212), and the spring (216) is sleeved on the telescopic rod (215).

4. The device for measuring breakout torque on a pipe string according to claim 1, characterized in that: A limiting column (222) is provided in the limiting long groove (221) so as to slide and rotate. The limiting column (222) is provided with a third through hole (2221) along the axial direction. The pressure head (2141) extends into the third through hole (2221) and the load direction of the pressure head (2141) is perpendicular to the radial direction of the clamping mounting plate (22). A force transmission component (223) is provided between the two sides of the rear end of the pressure head (2141) along the load direction and the inner wall of the third through hole (2221). The force transmission component ( 223) includes a pressure-bearing base (2231), a pressure-bearing steel ball (2232) and a steel ball pressure head (2233); the rear end of the pressure head (2141) is threadedly connected to a connecting bolt (2142); the pressure-bearing base (2231) is threadedly connected to the connecting bolt (2142); the steel ball pressure head (2233) is fixedly connected to the inner wall of the third through hole (2221); and the pressure-bearing steel ball (2232) is gap-arranged between the pressure-bearing base (2231) and the steel ball pressure head (2233).

5. The device for measuring breakout torque on a pipe string according to claim 4, characterized in that: A limiting portion (2222) is connected to the inner wall of the third through hole (2221) and is located on both sides of the front end of the pressure head (2141) along the vertical load direction. The limiting portion (2222) is clearance-matched with the side wall of the pressure head (2141).

6. The device for measuring breakout torque on a pipe string according to claim 1, characterized in that: The clamping mechanism assembly comprises a first clamping hydraulic cylinder (224), a plurality of the first clamping hydraulic cylinders (224) are fixedly connected to the clamping mounting plate (22), and the continuous forward and reverse rotation assembly (10) comprises a plurality of second clamping hydraulic cylinders (101); the output end of the first clamping hydraulic cylinder (224) and the output end of the second clamping hydraulic cylinder (101) are both connected to a clamping block (225), and the end face of the clamping block (225) is connected to a sawtooth block (226); the first clamping hydraulic cylinder (224) and the second clamping hydraulic cylinder (101) are both connected to a host computer (40).

7. The device for measuring breakout torque on a pipe string according to claim 1, characterized in that: The weighing sensor (214) is a shear beam type weighing sensor.

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