The invention relates to the technical field of flow safety guarantee of
offshore oil and gas fields, and discloses a control method for a
throttle valve of a gathering and transportation riser
system of an
offshore oil and gas platform, which comprises the following steps: acquiring the average
gas phase flow and the average
liquid phase flow of a riser in the gathering and transportation riser
system of the
offshore oil and gas platform during a serious
slug flow period; target pressure drop values of the two ends of the throttling valve of the stand
pipe under the standard working condition are obtained; according to the average
gas phase flow and the average
liquid phase flow, the valve local resistance coefficient when the pressure drop at the two ends of the throttling valve is controlled to reach the target pressure drop value during the serious
slug flow period of the vertical
pipe is determined, and the valve flow coefficient corresponding to the valve local resistance coefficient is determined; wherein the valve local resistance coefficient is used for indicating the valve resistance when the
throttle valve is controlled, and the valve flow coefficient is used for indicating the flow capacity of the
throttle valve; and the target opening degree of the throttling valve is determined through the valve flow coefficient, and the throttling valve is controlled to be adjusted to the target opening degree so as to eliminate the serious
slug flow.