The displacement is calculated by discharging a number of liters per minute, which is related to the diameter of the hole and the speed of flushing liquid required from the bottom of the hole, that is, the larger the aperture, the larger the required displacement. It is required that the up-return speed of the washing fluid can wash the cuttings and rock powder cut by the drill bit out of the bottom of the hole in time and carry them to the surface reliably. Geological core drilling, the general return speed in 0.4~1.0 m/min or so.
The pressure of the pump depends on the depth of the drilling hole, the resistance of the channel through which the flushing fluid passes and the properties of the flushing fluid. The deeper the hole is drilled, the greater the resistance of the line and the higher the pressure required.
With the change of the diameter and depth of the drilling hole, the displacement of the pump can be adjusted at any time. In the pump mechanism is provided with a gearbox or a hydraulic motor to adjust its speed, in order to achieve the purpose of changing the displacement. In order to accurately grasp the changes in the pressure and displacement of the pump, the mud pump to install flowmeter and pressure gauge, at any time so that the drilling personnel understand the pump transport, turn the situation, at the same time through the pressure change to determine whether the hole condition is normal to prevent accidents in the hole.
Post time: Feb-22-2022