Novel torque calibration system for combined hydraulic power tongs

Abstract

The utility model relates to a novel torque calibration system for combined hydraulic power tongs, which comprises an upper joint, a lower joint, a torque sensor, an upper support piece and a lower support piece, and is characterized in that the upper joint and the lower joint rotate relatively under the action of the torque of a tong head, and the torque is detected through the torque sensor; the upper supporting piece is fixedly connected to the upper connector in the circumferential direction, the lower supporting piece is fixedly connected to the lower connector in the circumferential direction, and the torque sensor is connected with the upper supporting piece and the lower supporting piece so as to detect the tong head torque between the upper connector and the lower connector. According to the invention, the torque can be accurately and sensitively detected, and the torque of the power tongs can be calibrated.

Description

Technical Field

[0001] The present application relates to a novel torque calibration system for a combined hydraulic power tongs. Background Art

[0002] During drilling and well repair operations, when lowering drill tools, casing, tubing and other pipes, it is necessary to apply torque to the pipes through power tongs to install the pipes so that the make-up torque value of the connection parts is consistent with the recommended or specified make-up torque value, thereby achieving the best effect in connection strength, sealing effect and service life of the connection parts. Therefore, when installing drilling tools, casing, tubing and other pipes, the size of the make-up torque value directly affects the make-up quality, and then affects the installation quality. During drilling and well repair operations, in order to avoid affecting the installation quality due to excessive or too small make-up torque at the connection parts when connecting pipes, a torque calibration device is usually used during the installation process to calibrate the make-up torque value so that the actual make-up torque value is consistent with the recommended or specified make-up torque value. At present, at the drilling and well repairing operation site, power tongs are often used as calibration devices for make-up torque to calibrate the make-up torque value. This operation brings the following problems: 1. The torque comparison table of the power tongs only indicates a small amount of matching relationship between hydraulic pressure and torque, especially no corresponding matching relationship between hydraulic pressure and torque is provided for small drilling tools, which cannot fully match the torque commonly used at the operation site. 2. The torque indicated in the torque comparison table of the power tongs is calculated by the hydraulic system and the mechanical part. During the use of the power tongs, there is pressure loss in the hydraulic system and mechanical loss in the mechanical part. Therefore, there is a deviation between the obtained torque and the actual torque, which cannot accurately indicate the torque of the power tongs. In other words, the matching relationship between the hydraulic pressure of the power tongs and the torque of the power tongs indicated in the torque comparison table of the power tongs does not match the actual matching relationship between the two. Therefore, it is necessary to use a torque calibration system to overcome the above-mentioned torque inaccuracy problem.

[0003] At present, the torque calibration system used in the market has low detection accuracy, resulting in deviations in the make-up torque value. For example, the Chinese utility model patent with the authorization announcement number CN203616036U and the title of a power tongs head torque calibration device discloses: a power tongs head torque calibration device, the power tongs head torque calibration device includes a simulated pipe and a torque sensor, the simulated pipe includes a simulated pipe upper joint and a simulated pipe lower joint; the torque sensor includes a torque meter and a sensor body; and the torque meter is sleeved in the middle of the sensor body; the sensor body is divided into two parts; one part is the detection connection end; the other part is the connecting shaft; the simulated pipe upper joint is sleeved on the detection connection end, and the simulated pipe lower joint is sleeved on the connecting shaft. The technical solution described in the utility model uses a torque meter sleeved on the sensor to detect the torque size. Due to the small force arm of the structure, the torque cannot be sensitively detected or the detection is inaccurate. Utility Model Content

[0004] The present application provides a novel torque calibration system for a combined hydraulic power tongs, which can accurately and sensitively detect the torque magnitude and perform torque calibration on the power tongs.

[0005] According to the present application, a new torque calibration system for a combined hydraulic power tongs includes an upper joint, a lower joint and a torque sensor. The upper joint and the lower joint can rotate relative to each other under the action of the tongs head torque and detect the magnitude of the torque through the torque sensor. It also includes an upper support member and a lower support member. The upper support member is circumferentially fixed to the upper joint, and the lower support member is circumferentially fixed to the lower joint. The torque sensor is respectively connected to the upper support member and the lower support member to detect the magnitude of the tongs head torque between the upper joint and the lower joint.

[0006] Wherein, the upper joint may include an upper shaft core and an upper shaft sleeve, the outer surface of the upper shaft core may be provided with an internal spline / external spline arranged along the axial direction, and the upper shaft sleeve is circumferentially fixed to the upper shaft core via the external spline / internal spline arranged on its inner surface; the lower joint may include a lower shaft core and a lower shaft sleeve, the outer surface of the lower shaft core may be provided with an internal spline / external spline arranged along the axial direction, and the lower shaft sleeve is circumferentially fixed to the lower shaft core via the external spline / internal spline arranged on its inner surface.

[0007] Wherein, the upper support member may include an upper main support fin, the upper main support fin may include an upper main clamping portion and an upper main connecting portion, the upper main clamping portion is provided with an external spline / internal spline to be fixedly connected to the internal spline / external spline on the outer surface of the upper shaft core, and the upper main connecting portion is connected to the torque sensor; the lower support member may include a lower main support fin, the lower main support fin includes a lower main clamping portion and a lower main connecting portion, the lower main clamping portion is provided with an external spline / internal spline to be fixedly connected to the internal spline / external spline on the outer surface of the lower shaft core, and the lower main connecting portion is connected to the torque sensor.

[0008] Among them, the upper support member may also include an upper auxiliary support fin, the upper auxiliary support fin includes an upper auxiliary limiting portion and an upper auxiliary connecting portion, the upper auxiliary limiting portion is sleeved on the periphery of the lower shaft core, and the upper auxiliary connecting portion is connected to the torque sensor; the lower support member may also include a lower auxiliary supporting fin, the lower auxiliary supporting fin includes a lower auxiliary limiting portion and a lower auxiliary connecting portion, the lower auxiliary limiting portion is sleeved on the periphery of the lower shaft core or the upper shaft core, and the lower auxiliary connecting portion is connected to the torque sensor.

[0009] Wherein, the extension direction of the upper secondary connection part can be consistent with the extension direction of the upper main connection part; the extension direction of the lower secondary connection part can be consistent with the extension direction of the lower main connection part. Wherein, the upper main connection part can extend in the radial direction; the lower main connection part can also extend in the radial direction. Wherein, the lower main support fin and the lower secondary support fin can be located between the upper main support fin and the upper secondary support fin. Wherein, the upper main support fin and the upper secondary support fin can be fixedly connected by an axially extending pin shaft, and the lower main support fin and the lower secondary support fin are provided with a hole for the pin shaft to pass through.

[0010] Among them, one end of the torque sensor can be arranged between the free end of the upper main connection part and the free end of the upper auxiliary connection part; the other end of the torque sensor can be arranged between the free end of the lower main connection part and the free end of the lower auxiliary connection part.

[0011] Wherein, a protective shell may be further included, and the upper support member, the lower support member and the torque sensor may be located in an inner cavity of the protective shell.

[0012] According to the technical solution of the present application, the following beneficial effects are achieved: the torque sensor is respectively connected to the upper support member fixed to the upper joint and the lower support member fixed to the lower joint, and a larger force arm is provided by the upper support member and the lower support member so that the torque sensor can detect the torque more sensitively and accurately; axial relative movement can be achieved between the upper shaft core and the upper shaft sleeve, and between the lower shaft core and the lower shaft sleeve, which is convenient for disassembly and maintenance; through the cooperation between the upper main support member and the upper auxiliary support member, and the lower main support member and the lower auxiliary support member, the installation of the torque sensor is more stable and does not affect the accuracy of torque detection; the setting of the protective shell can better ensure the accuracy of torque detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the structure of a new torque calibration system for the combined hydraulic power tongs of this application.

[0014] Figure 2 for Figure 1 Schematic diagram of partial structural breakdown of the new torque calibration system for medium combined hydraulic power tongs.

[0015] Figure 3 for Figure 2 Schematic diagram of further decomposition of some structures of the new torque calibration system for combined hydraulic power tongs.

[0016] Figure 4 It is a schematic diagram of the coordination structure of the upper support member, the lower support member, the upper shaft core, the lower shaft core and the torque sensor, which shows the effect after the upper shaft core is pulled out a certain distance.

[0017] 1 upper joint, 11 upper shaft core, 12 upper shaft sleeve, 2 lower joint, 21 lower shaft core, 22 lower shaft sleeve, 3 torque sensor, 4 upper support, 41 upper main support fin, 411 upper main clamping part, 412 upper main connecting part, 42 upper auxiliary support fin, 421 upper auxiliary limiting part, 422 upper auxiliary connecting part, 5 lower support, 51 lower main support fin, 511 lower main clamping part, 512 lower main connecting part, 52 lower auxiliary support fin, 521 lower auxiliary limiting part, 522 lower auxiliary connecting part, 6 pin shaft. DETAILED DESCRIPTION

[0018] The present application is further described below in conjunction with the accompanying drawings:

[0019] See also Figure 1-4As shown, a new torque calibration system for combined hydraulic power tongs includes an upper joint 1, a lower joint 2 and a torque sensor 3. The upper joint 1 and the lower joint 2 rotate relative to each other under the action of the tongs head torque and the torque is detected by the torque sensor 3. The system also includes an upper support 4 and a lower support 5. The upper support 4 is circumferentially fixed to the upper joint 1, and the lower support 5 is circumferentially fixed to the lower joint 2. The torque sensor 3 is respectively connected to the upper support 4 and the lower support 5 to detect the tongs head torque between the upper joint 1 and the lower joint 2. In the present application, the torque sensor is respectively connected to the upper support circumferentially fixed to the upper joint and the lower support circumferentially fixed to the lower joint, and a larger force arm is provided by pulling the upper support and the lower support apart, so that the torque sensor can detect the tongs head torque more sensitively and accurately, with a simple structure, low cost and more durability.

[0020] See also Figure 2-4 As shown, the upper joint 1 includes an upper shaft core 11 and an upper sleeve 12. The outer surface of the upper shaft core 11 is provided with an inner spline / outer spline arranged along the axial direction. The upper sleeve 12 is circumferentially fixed to the upper shaft core 11 through the outer spline / inner spline arranged on its inner surface. The lower joint 2 includes a lower shaft core 21 and a lower sleeve 22. The outer surface of the lower shaft core 21 is provided with an inner spline / outer spline arranged along the axial direction. The lower sleeve 22 is circumferentially fixed to the lower shaft core 21 through the outer spline / inner spline arranged on its inner surface. In the present application, the upper sleeve 12 drives the upper shaft core 11 to rotate circumferentially after being clamped, and the lower sleeve 22 drives the lower shaft core 21 to rotate circumferentially after being clamped, so that the upper shaft core 11 and the lower shaft core 21 rotate relative to each other. In the present application, the assembly method of the upper shaft core and the upper shaft sleeve, and the lower shaft core and the lower shaft sleeve will not hinder the axial movement between the upper shaft core and the upper shaft sleeve, and the axial movement between the lower shaft core and the lower shaft sleeve. Therefore, it is easier to disassemble and assemble the components after they are damaged, and the maintenance efficiency is high.

[0021] See also Figure 3 As shown, the upper support member 4 includes an upper main support fin 41, which includes an upper main clamping portion 411 and an upper main connecting portion 412. The upper main clamping portion 411 is provided with an outer spline / inner spline to be circumferentially fixed with the inner spline / outer spline on the outer surface of the upper shaft core 11, and the upper main connecting portion 412 is connected to the torque sensor 3. The lower support member 5 includes a lower main support fin 51, which includes a lower main clamping portion 511 and a lower main connecting portion 512. The lower main clamping portion 511 is provided with an outer spline / inner spline to be circumferentially fixed with the inner spline / outer spline on the outer surface of the lower shaft core 21, and the lower main connecting portion 512 is connected to the torque sensor 3.

[0022] See also Figure 3As shown, the upper support member 4 further includes an upper auxiliary support fin 42, which includes an upper auxiliary limit portion 421 and an upper auxiliary connection portion 422, the upper auxiliary limit portion 421 is sleeved on the periphery of the lower shaft core 21, and the upper auxiliary connection portion 422 is connected to the torque sensor 3; the lower support member 5 further includes a lower auxiliary support fin 52, the lower auxiliary support fin 52 includes a lower auxiliary limit portion 521 and a lower auxiliary connection portion 522, the lower auxiliary limit portion 521 is sleeved on the periphery of the lower shaft core 21 or the upper shaft core 11, and the lower auxiliary connection portion 522 is connected to the torque sensor 3. Preferably, the upper auxiliary limit portion 421 and the lower auxiliary limit portion 521 are annular.

[0023] See also Figure 3 As shown, the extension direction of the upper secondary connection portion 422 is consistent with the extension direction of the upper main connection portion 412; the extension direction of the lower secondary connection portion 522 is consistent with the extension direction of the lower main connection portion 512. Figure 2-4 As shown, the upper main connecting portion 412 extends in the radial direction; the lower main connecting portion 512 also extends in the radial direction. Figure 2-4 As shown, the lower main supporting fin 51 and the lower auxiliary supporting fin 52 are located between the upper main supporting fin 41 and the upper auxiliary supporting fin 42. Preferably, in order to better support each fin and limit the pin described below, a clamping member 7 is also provided.

[0024] See also Figure 3-4 As shown, the upper main support fin 41 and the upper auxiliary support fin 42 are fixedly connected by an axially extending pin 6, and the lower main support fin 51 and the lower auxiliary support fin 52 are provided with holes for the pin to pass through. Figure 2-4 As shown, one end of the torque sensor 3 is disposed between the free end of the upper main connection part 412 and the free end of the upper auxiliary connection part 422; the other end of the torque sensor 3 is disposed between the free end of the lower main connection part 512 and the free end of the lower auxiliary connection part 522. Figure 1-3 As shown, it also includes a protective shell 8, the upper support member 4, the lower support member 5 and the torque sensor 3 are located in the inner cavity of the protective shell 8, and the protective shell 8 is in the shape of a chamfered prism. Preferably, the protective shell 8 is formed by two end caps 80 that are matched to each other, and each of the end caps 80 is provided with a through hole for the upper joint and the lower joint to pass through.

[0025] Although the specific implementation methods of the present application have been described above, those skilled in the art may modify them without departing from the spirit and principles of the present application, and the scope of protection of the utility model is particularly defined by the claims and their equivalents.

Claims

1. A novel torque calibration system for a combined hydraulic power tongs, comprising an upper joint, a lower joint and a torque sensor, wherein the upper joint and the lower joint can rotate relative to each other, and characterized in that: It also includes an upper support member and a lower support member, wherein the upper support member is fixedly connected to the upper joint, and the lower support member is fixedly connected to the lower joint, and the torque sensor is respectively connected to the upper support member and the lower support member to detect the clamp head torque between the upper joint and the lower joint.

2. The novel torque calibration system for combined hydraulic power tongs according to claim 1 is characterized in that: The upper joint includes an upper shaft core and an upper shaft sleeve, the outer surface of the upper shaft core is provided with an internal spline / external spline arranged along the axial direction, and the upper shaft sleeve is circumferentially fixed to the upper shaft core via the external spline / internal spline arranged on its inner surface; the lower joint includes a lower shaft core and a lower shaft sleeve, the outer surface of the lower shaft core is provided with an internal spline / external spline arranged along the axial direction, and the lower shaft sleeve is circumferentially fixed to the lower shaft core via the external spline / internal spline arranged on its inner surface.

3. The novel torque calibration system for combined hydraulic power tongs according to claim 2 is characterized in that: The upper support member includes an upper main support fin, which includes an upper main clamping portion and an upper main connecting portion, wherein the upper main clamping portion is provided with an external spline / internal spline to be circumferentially fixedly connected to the internal spline / external spline on the outer surface of the upper shaft core, and the upper main connecting portion is connected to the torque sensor; the lower support member includes a lower main support fin, which includes a lower main clamping portion and a lower main connecting portion, wherein the lower main clamping portion is provided with an external spline / internal spline to be circumferentially fixedly connected to the internal spline / external spline on the outer surface of the lower shaft core, and the lower main connecting portion is connected to the torque sensor.

4. The novel torque calibration system for combined hydraulic power tongs according to claim 3 is characterized in that: The upper support member also includes an upper auxiliary support fin, which includes an upper auxiliary limiting portion and an upper auxiliary connecting portion, the upper auxiliary limiting portion is sleeved on the periphery of the lower shaft core, and the upper auxiliary connecting portion is connected to the torque sensor; the lower support member also includes a lower auxiliary supporting fin, which includes a lower auxiliary limiting portion and a lower auxiliary connecting portion, the lower auxiliary limiting portion is sleeved on the periphery of the lower shaft core or the upper shaft core, and the lower auxiliary connecting portion is connected to the torque sensor.

5. The novel torque calibration system for combined hydraulic power tongs according to claim 4 is characterized in that: The extension direction of the upper auxiliary connection part is consistent with the extension direction of the upper main connection part; the extension direction of the lower auxiliary connection part is consistent with the extension direction of the lower main connection part.

6. The novel torque calibration system for combined hydraulic power tongs according to claim 4 or 5, characterized in that: The upper main connecting portion extends in a radial direction; the lower main connecting portion also extends in a radial direction.

7. The novel torque calibration system for combined hydraulic power tongs according to claim 4 or 5, characterized in that: The lower main supporting fin and the lower auxiliary supporting fin are located between the upper main supporting fin and the upper auxiliary supporting fin.

8. The novel torque calibration system for combined hydraulic power tongs according to claim 7 is characterized in that: The upper main supporting fin and the upper auxiliary supporting fin are fixedly connected via an axially extending pin shaft, and the lower main supporting fin and the lower auxiliary supporting fin are provided with holes for the pin shaft to pass through.

9. The novel torque calibration system for combined hydraulic power tongs according to claim 5 is characterized in that: One end of the torque sensor is arranged between the free end of the upper main connection part and the free end of the upper auxiliary connection part; the other end of the torque sensor is arranged between the free end of the lower main connection part and the free end of the lower auxiliary connection part.

10. A novel torque calibration system for combined hydraulic power tongs according to any one of claims 1-2, 4-5, 8-9, characterized in that: A protective shell is also included, wherein the upper support member, the lower support member and the torque sensor are located in an inner cavity of the protective shell.

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