Based on the basic principle of hydromechanics, the flow characteristic of drilling fluid on
the screen was studied. By taking the consideration of various parameters affecting the screening
effects, such as vibration and screen angle, a screening model for a drilling fluid shale shaker was
established. The screening equations were solved by average energy principle and finite differential
method, and the treating capacity of a shaker was calculated numerically. The comparison between the
results of calculation and indoor simulation rig test shows that the screening model is of high accuracy.