Opening adjustment method and device for throttle valve

Abstract

The invention discloses an opening adjustment method and device for a throttle valve. The method comprises the steps that an adjustment curve between opening deviations of the throttle valve and output currents of an electro-hydraulic proportional valve is established based on opening adjustment characteristics of the throttle valve; opening variation data of the throttle valve is acquired in real time, and the opening deviations of the throttle valve are calculated by use of the opening variation data and an opening set value; and current signals controlling the electro-hydraulic proportional valve are acquired to adjust the opening of the throttle value according to the opening deviations and the adjustment curve. Through the method, the nonlinearity requirement and the continuity requirement of the throttle valve during adjustment can be met at the same time, and adjustment precision can be remarkably improved.

Description

technical field [0001] The invention relates to the field of oil drilling process control, in particular to a method and device for adjusting the opening of a throttle valve. Background technique [0002] With the rapid development of the petroleum industry, the actual exploration and development have higher and higher requirements for various drilling technologies. Drilling technology has begun to develop towards automation and intelligence. A large number of new automated and intelligent drilling technologies have emerged and are widely used in various job sites. Precision managed pressure drilling technology is an aspect of automated drilling, which is used to automatically monitor bottomhole pressure during drilling. [0003] Fine managed pressure drilling refers to real-time monitoring of wellbore pressure through data monitoring system and wellhead equipment to realize safe drilling. In the MPD system equipment, the wellhead back pressure is controlled by adjusting t...

AI Technical Summary

Problems solved by technology

However, the actual throttle valve has nonlinear and time-varying uncertainties, so it is difficult to establish an accurate mathematical model

At the same time, the underground working conditions of drilling are very complicated, and the PID algorithm is troubled by the complicated parameter setting methods. The PID controller parameters are often poorly set, the performance is not good, and the adaptability to the operating conditions is poor.

In addition, the throttle valve needs to adjust the two-way action of the hydraulic cylinder. Using the PID algorithm for two-way control will significantly increase the complexity of the control method and affect the control effect

On the other hand, the control of the throttle valve in the existing technology is mostly focused on the direction control, but cannot perform high-precision speed adjustment, and cannot adapt to the need for quick adjustment when the opening deviation of the throttle valve is large, and the need for rapid adjustment when the opening deviation is small. fine-tuning requirements

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