Active control of the fluid pulse based on the FxLMS

In petroleum engineering, the performance of drilling fluid is the key factor affecting the drilling success. Drilling fluid rheology can be measured by tube measurement. Fluid pulsation will cause measurement deviation of differential pressure and flow velocity data during measurement, and it accumulates when the flow curve is drawn. Finally, the accuracy of drilling fluid rheological pipe measurement is seriously affected. In view of the problem of fluid pulsation can seriously affect the accuracy of tube measurement. This paper proposed an algorithm based on Filtered-x least mean square (FxLMS). First, the active control strategy is studied, the mathematical model of electric regulating valve control is established, the FxLMS algorithm of variable step length is studied, the simulation model of the control system is established, and the control effect of different algorithms is compared. The dynamic experimental platform of fluid pulse active control for drilling fluid rheological pipe measurement is designed and built. The experimental data show that: after active control, the average relative error of drilling fluid shear force decreased by 179.6%, the average relative error of plastic viscosity decreased by 78.1%, and the average relative error of the apparent viscosity decreased by 25.5%. It proves that the active control algorithm can improve the accuracy of tube measurement more effectively.