The two main parameters of mud pump performance are displacement and pressure.

Displacement:

The displacement is calculated by discharging several liters per minute, which is related to the drilling diameter and the required flushing fluid velocity from the bottom of the hole, that is, the larger the hole diameter, the greater the required displacement. The upward and backward speed of the flushing fluid is required to timely flush the rock debris and powder cut by the drill bit off the bottom of the hole and reliably carry them to the surface. When drilling geological cores, the general upward velocity is around 0.4~1.0 meters/minute.

Pressure:

The pressure of the pump depends on the depth of the borehole, the resistance of the channel through which the flushing fluid passes, and the properties of the flushing fluid conveyed. The deeper the drilling, the greater the pipeline resistance and the higher the required pressure.

As the diameter and depth of the borehole change, it is required that the pump displacement can also be adjusted at any time. The pump mechanism is equipped with a gearbox or a hydraulic motor to adjust its speed to achieve the purpose of changing the displacement. In order to accurately grasp the changes in pump pressure and displacement, a flow meter and pressure gauge should be installed on the mud pump, so that the drilling personnel can understand the operation of the pump at any time. At the same time, the pressure changes can be used to determine whether the condition in the hole is normal to prevent accidents in the hole.