Well killing operation throttle valve automatic control system based on feedback adjustment and method thereof

Abstract

The invention discloses a well killing operation throttle valve automatic control system based on feedback adjustment and a method thereof. The well killing operation throttle valve automatic control system comprises a self-healing controller (1), a PLC (2), a central computer (3), a feedback compensator (4), a throttle valve (5), a stand pipe pressure transmitter (6), a sensor-data collection system (7), a feedforward compensator (8) and a basic data source (9). The topological structure of the automatic control system is shown as in an attached map. The well killing operation throttle valve automatic control system and the method thereof have the advantages that the well killing process can be simulated before well killing according to well killing related data through a software related algorithm according to the transmission speed and attenuation law of liquid phase pressure waves; the progress curve of whole well killing operation and the initial control curve of the throttle valve are obtained; the initial control curve of the throttle valve is fitted by the computer according to a simulation result, and the throttle valve is controlled through the PLC; in the operation process, the throttle valve is subjected to feedback adjustment through the feedforward compensator to enable the pressure of a stand pipe to be stabilized within a set range all the time; and possible faults are diagnosed and corrected by the self-healing controller. By adoption of the well killing operation throttle valve automatic control system, delays and errors caused by manual operation are avoided, remote automatic operation can be achieved, and safety hazards are avoided.

Description

technical field [0001] The invention relates to an automatic control system and method for a throttle valve in well killing operation based on feedback adjustment, and belongs to the technical field of well drilling and well control. Background technique [0002] During oilfield drilling operations, when drilling into high-pressure formations, the original drilling fluid may be difficult to balance the bottomhole pressure, which may cause formation fluids to invade the annulus and overflow. After the overflow is found, the well needs to be shut down immediately, and the relevant data should be recorded to carry out well killing operations. That is, pump such as high-density drilling fluid into the out-of-balance well, and control the bottom-hole pressure to always be slightly greater than the formation pressure. During the well killing process, controlling the bottom hole pressure to be slightly greater than the formation pressure is achieved by controlling a certain wellhe...

AI Technical Summary

Problems solved by technology

In the actual operation process, since the pressure wave transmission of the liquid column is about 300m / s, when the throttle valve is adjusted, the pressure transmission will lag behind.

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