Method for directly measuring torque of drill rod pliers

Abstract

The invention belongs to the technical field of drilling equipment parameter measurement, and discloses a method for directly measuring the torque of drill pipe tongs, which comprises the following steps: S1, fixing a force transducer on a driven chain wheel shaft for measuring the force F applied on the driven chain wheel shaft; s2, a notched chain wheel of the drill rod clamp is connected to the drill rod buckle in a clamped mode, and the drill rod clamp is started; s3, the torque T on the output shaft of the hydraulic motor is measured; s4, substituting the measured values of F and T into a formula T = 2F * L to obtain L; and S5, reading the value F of the force transducer on the driven chain wheel shaft when the drill pipe clamp is used for measuring the torque T, and substituting F and L into a formula T = 2F * L to obtain T, namely the torque acting on the drill pipe buckle. The torque applied to the drill rod can be rapidly and accurately measured, the measurement mode is simple, and the measurement precision is high.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of drilling equipment parameter measurement, and relates to a method for measuring the torque of a drill pipe tong, in particular to a method for directly measuring the torque of a drill pipe tong. BACKGROUND

[0002] The drill pipe tong is widely used in oil drilling operations and is essential wellhead equipment for drilling. With the continuous development of oil exploration and development technology, the number of deep and ultra-deep wells is increasing, and strict requirements are placed on the torque accuracy of the make-up and breakout of drilling tools to ensure drilling quality. If the torque is too large, the drill pipe thread will be damaged and it will be difficult to break out. If the torque is insufficient, the drill pipe thread will be damaged and the drill pipe will be expanded during secondary make-up, resulting in significant losses. In the prior art, due to the mechanical structure of the drill pipe tong, the torque of the drill pipe power tong is estimated by measuring the oil pressure output by the hydraulic pump, and the torque output by the hydraulic motor is the make-up and breakout torque. However, this indirect measurement method must know the transmission ratio of the power tong, and the chain wheel of the power tong is hidden in the internal housing and is not easy to obtain. Moreover, the calculation of the transmission ratio of the power tong is greatly affected by the model of the hydraulic motor and the environment, and there is a large measurement error, thereby resulting in low measurement accuracy. SUMMARY

[0003] The purpose of the present application is to provide a method for directly measuring the torque of a drill pipe tong to improve the measurement accuracy of the torque of the drill pipe tong.

[0004] To achieve the above purpose, the technical solution adopted by the present application is as follows: A method for directly measuring the torque of a drill pipe tong, comprising the following steps: I. Calculate the force arm L of the drill pipe tong S1: Fix a force sensor on any driven sprocket shaft of the drill pipe tong to measure the force F applied to the driven sprocket shaft; S2: Attach the notched sprocket of the drill pipe tong to the drill pipe coupling, start the drill pipe tong, and the hydraulic motor of the drill pipe tong drives the transmission chain, driven sprocket and notched sprocket of the drill pipe tong to rotate. The torque generated by the output shaft of the hydraulic motor is the torque of the notched sprocket acting on the drill pipe coupling; S3: Measure the torque T on the output shaft of the hydraulic motor; S4: Enter the measured values of F and T into the formula T=2F*L to obtain L, which is the force arm of the drill pipe tong acting on the driven sprocket shaft, i.e. the fixed value of the drill pipe tong; II. Measure the torque acting on the drill pipe coupling S5: When measuring the torque T by using the drill pipe tong, the value F of the force sensor on the driven sprocket shaft is read, and F and L are brought into the formula T=2F*L to obtain T, which is the torque acting on the drill pipe.

[0005] As a limitation of the present application, in S1, the two force sensors are fixed on the two driven sprocket shafts of the drill pipe tong respectively, and the forces on the two driven sprocket shafts are measured as F1 and F2 respectively, and F=(F1+F2) / 2.

[0006] As a further limitation of the present application, in S3, the torque T on the output shaft of the hydraulic motor is measured by the torque checking device.

[0007] As another limitation of the present application, in S5, the value of the force sensor is collected by the torque meter, and the real-time torque value is calculated and displayed by the handheld terminal.

[0008] Compared with the prior art, the present application has the following technical progress: The present application converts the torque acting on the drill pipe into the torque output by the hydraulic motor shaft, and uses the formula moment=force*force arm to quickly and accurately calculate the torque. As long as the force arm from the force point to the force application point of the drill pipe tong is measured, the torque can be calculated. Through force analysis, the torque acting on the drill pipe is the tension of the transmission chain and the force acting on the two driven sprocket shafts. The force acting on the driven sprocket shaft is obtained in real time by the force sensor, which is more convenient and accurate. The real-time torque value can be accurately obtained by the visual display of the handheld terminal. When measuring, as long as the torque value reaches the required value, it can be determined whether the torque meets the requirements. Compared with the estimation method in the prior art, the measurement accuracy of the present application is higher, and it is not affected by the environment, has strong adaptability, and does not need to know the transmission ratio of the drill pipe tong. The measurement method is simpler, and it can not only measure the make-up torque, but also measure the breakout torque, which is more practical.

[0009] In summary, the present application can quickly and accurately measure the torque applied to the drill pipe, and the measurement method is simple, the measurement accuracy is high, and it is suitable for measuring the make-up and breakout torque of the drill pipe. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 is a schematic view of the internal structure of the drill pipe tong according to an embodiment of the present application.

[0011] In the figure, 1 is a hydraulic motor, 2 is a driving sprocket, 3 is a driven sprocket, 4 is a notched sprocket, and 5 is a transmission chain. DETAILED DESCRIPTION

[0012] The present application will be further described in detail through specific embodiments. It should be understood that the described embodiments are only for explaining the present application and do not limit the present application.

[0013] Example: Method for directly measuring drill pipe tong torque This embodiment includes two main steps. First, the lever arm between the point of force application and the point of force application of the drill pipe tong is measured. After measurement, the lever arm of the drill pipe tong is a fixed value. Then, the force acting on the point of force application is measured, and the torque acting on the drill pipe thread can be calculated by substituting it into the formula.

[0014] 1. Calculate the lever arm L of the drill pipe tong. like Figure 1 As shown, this structure is the internal transmission structure of the drill pipe tong, which includes a drive sprocket 2, two driven sprockets 3, a notched sprocket 4, and a transmission chain 5. The transmission chain 5 connects the drive sprocket 2, the two driven sprockets 3, and the notched sprocket 4. The drive sprocket 2 is fixedly connected to the output shaft of the hydraulic motor 1. The notched sprocket is used to engage the drill bits on the drill pipe. The rotation of the hydraulic motor 1 drives the drive sprocket 2 to rotate, which in turn drives the notched sprocket 4 to rotate. The clockwise and counterclockwise rotation of the notched sprocket 4 realizes the engagement and disengagement of the drill pipe.

[0015] The principle for determining the lever arm L is as follows: When the hydraulic motor 1 drives the notched sprocket 4 to rotate, the notched gear is blocked by the drill bit, and the transmission chain 5 will be tensioned according to the torque output by the hydraulic motor 1. The greater the torque output by the hydraulic motor 1, the greater the tension of the transmission chain 5. Therefore, the torque output by the hydraulic motor 1 and the tension of the transmission chain 5 are directly proportional. Let the output torque of the hydraulic motor 1 be T, and the tension of the transmission chain 5 be F, then torque (T) = force (F) × lever arm (L). Since the lever arm and tension of the transmission chain 5 are difficult to measure, through force analysis, the tension of the transmission chain 5 is the sum of the torques on the two driven sprockets 3. Since the two driven sprockets 3 are symmetrically arranged, the torque and lever arm are the same, so the following relationship exists: T = 2FL. Because the structure of each drill tong is fixed, the value of L is fixed. By measuring the value of L, the torque T can be obtained based on the force values ​​on the two driven sprockets 3.

[0016] The steps for determining the L value are as follows: S1: By Figure 1It can be seen that the pipe tong comprises two driven sprockets 3, and the two driven sprockets 3 are symmetrically arranged, therefore, the distance between the two driven sprockets 3 and the pressure motor is the same, the force acting on the two driven sprockets 3 is also the same, and the force acting on one of the driven sprockets 3 is multiplied by two to obtain the force acting on the two driven sprockets 3. However, due to assembly errors, the force acting on the two driven sprockets 3 will have some errors, in order to improve the measurement accuracy, two force sensors are fixed on the shafts of the two driven sprockets 3 of the pipe tong, the force sensor is internally provided with a strain resistance piece structure, when the transmission chain 5 applies a force to the shaft of the driven sprocket 3, the strain resistance piece of the force sensor will change the resistance, thereby the forces acting on the shafts of the two driven sprockets 3 are F1 and F2 respectively, and F=(F1+F2) / 2.

[0017] S2: The notched sprocket 4 of the pipe tong is clamped on the pipe tong, the pipe tong is started, the hydraulic motor 1 of the pipe tong drives the transmission chain 5, the driven sprocket 3 and the notched sprocket 4 of the pipe tong to rotate, the notched sprocket 4 drives the pipe tong to rotate, and the pipe tong is made up or disassembled, at this time, according to force transmission, the torque generated by the output shaft of the hydraulic motor 1 is the torque acting on the pipe tong by the notched sprocket 4.

[0018] S3: The torque T on the output shaft of the hydraulic motor 1 when the pipe tong is started and the notched chain drives the pipe tong to loosen or tighten is measured by the torque checking device in the prior art. Since each buckle has an optimal torque value, when the torque checking device measures the torque T on the output shaft of the hydraulic motor 1 as the torque value of the buckle, the tightening state is reached. S4: The values of F and T are brought into the formula T=2F*L to obtain L, and L is the force arm acting on the shaft of the driven sprocket 3 of the pipe tong, that is, the fixed value of the pipe tong.

[0019] II. Measurement of the torque acting on the pipe tong S5: When the torque T of the pipe tong is measured, the values F1 and F2 of the force sensors on the shafts of the two driven sprockets 3 are collected by the torque instrument, the formula F=(F1+F2) / 2 and the formula T=2F*L are brought into the handheld terminal, the handheld terminal of the embodiment is an electronic display screen, the force sensor transmits the force value information of F1 and F2 to the electronic display screen, and brings the formula F=(F1+F2) / 2 and the formula T=2F*L into the electronic display screen, through calculation, the electronic display screen displays the real-time torque value T acting on the pipe tong, thereby realizing accurate monitoring of the torque of the pipe tong make-up and disassembly.

[0020] The above only describes the optional embodiments of the present application, and does not limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for directly measuring the torque of a drill pipe tong, characterized in that, Includes the following steps:

1. Calculate the lever arm L of the drill pipe tong. S1: Fix the force sensor to any one of the driven sprocket shafts of the drill pipe tong to measure the force F applied to the driven sprocket shaft; S2: Attach the notch sprocket of the drill pipe tong to the drill pipe buckle, start the drill pipe tong, and the hydraulic motor of the drill pipe tong will drive the drive chain, driven sprocket and notch sprocket of the drill pipe tong to rotate through the drive sprocket. The torque generated by the output shaft of the hydraulic motor is the torque of the notch sprocket acting on the drill pipe buckle. S3: Measure the torque T on the output shaft of the hydraulic motor; S4: Substitute the measured values ​​of F and T into the formula T=2F*L to obtain L. L is the lever arm of the drill tong acting on the driven sprocket shaft, which is the fixed value of the drill tong. II. Measuring the torque acting on the drill pipe thread S5: When using this drill pipe tong to measure torque T, read the value F of the force sensor on the driven sprocket shaft, substitute F and L into the formula T=2F*L, and obtain T, which is the torque acting on the drill pipe thread.

2. The method for directly measuring drill pipe tong torque according to claim 1, characterized in that, In S1, two force sensors are fixed on the two driven sprocket shafts of the drill pipe tong, and the forces on the two driven sprocket shafts are measured as F1 and F2, respectively, F = (F1 + F2) / 2.

3. The method for directly measuring drill pipe tong torque according to claim 1, characterized in that, In S3, the torque T on the output shaft of the hydraulic motor is measured by a torque verification device.

4. The method for directly measuring drill pipe tong torque according to any one of claims 1-3, characterized in that, In S5, the torque sensor collects the value of the torque measurement sensor through a torque meter, and calculates and displays the real-time torque value through a handheld terminal.

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