Research on wireless measurement technology of top drive drill string torque based on safety joint
Drill string torque is one of the important parameters to reflect working state of drilling tools,it is particularly important to measure the torque.A torque wireless measurement system based on the top drive safety joint is designed.The experimental specimen of the safety joint is made by the surface strain of the experimental specimen replacing the surface strain of the AJ-H203 safety joint.The finite element statics simulations of the safety joints and the experimental specimens are conducted,and the measuring experiment of the experimental specimen is completed.The sensitivity of measuring experiment is 9.447 V/(kN·m),which is deviating 0.04 V/(kN·m)from the oretical sensitivity.So it is reasonable that the experimental specimen replaces the model of the safty joint to conducting the measuring experiment and it shows that the torque of top drive drill string can be measured through the safety joint.
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