Factors Used By Dth Hammer


Although DTH Hammer is designed to be used in a wide range of drilling conditions

Although DTH Hammer is designed to be used in a wide range of drilling conditions, the following factors have a great influence on the normal operation of DTH Hammer.

 

  一. Drilling fluid

 

  DTH Hammer can be adapted to various types of drilling fluids, but the specific gravity and viscosity of the drilling fluid should be considered. Under the premise of meeting the well washing, the specific gravity and viscosity of the drilling fluid should be reduced as much as possible, and the specific gravity of the drilling fluid should not be greater than 1.50.

 

  二. Drill pressure

 

  During the drilling operation, the weight on bit should be gradually increased to make the DTH Hammer motor pressure drop as far as possible to reach the upper limit of the specified value, so as to ensure that the DTH Hammer motor can provide the maximum output torque to meet the needs of rock breaking. At the same time, the WOB should be controlled within the recommended larger WOB. Excessive WOB will not only damage the thrust bearing of the drive shaft, but also cause the motor pressure drop to be too high and hysteresis. If the stagnation time is too long, Will cause serious damage to the motor.

 

   3. Torque

 

  DTH Hammer has the characteristic that the output torque is proportional to the pressure drop of the motor. The actual output torque of the DTH Hammer depends on the weight on bit. Theoretically, the torque change has no effect on the working speed. The motor with better performance will reduce the speed from no load to the effective larger working load area by no more than 10%. DTH Hammer drives the drill bit to rotate clockwise, and at the same time generates a counter torque on the casing of the drill. The counter torque is The sum of the output torque and the friction loss torque. The reaction torque is transmitted to the drill string through the DTH Hammer shell, which causes the upper part of the DTH Hammer motor to be tightly connected, and the lower part of the DTH Hammer motor is connected to the male buckle to loosen, and the reaction torque It reaches a larger value when the drilling tool is stuck. Since the anti-torque of DTH Bit will affect the azimuth of drilling, the existence of anti-torque should be taken into consideration during directional operations.

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