Abstract: In view of the problems of complex downhole conditions, low control precision of bottomhole pressure, low one-time success rate of well-killing and the like during a high-temperature and high-pressure deep well-killing operation, a well-killing operation wellbore flowing model is established according to measured data during throttled well-killing. The fluid distribution and flowing states in a wellbore annulus are analyzed in real time, and during a measured standpipe pressure deviation design, a pressure control value is calculated accurately in consideration of the effects of a pressure wave propagation speed and a back pressure application delay, and a throttle valve is automatically adjusted and automatically controlled to actuate.

Abstract: An intelligent throttled well-killing method and device for overflow in high-temperature and high-pressure deep drilling is provided. In view of the problems of complex downhole conditions, low control precision of bottomhole pressure, low one-time success rate of well-killing and the like during the high-temperature and high-pressure deep well-killing operation. A well-killing operation wellbore flowing model is established according to measured data during throttled well-killing. The fluid distribution and flowing states in an wellbore annulus are analyzed in real time, and during a measured standpipe pressure deviation design, a pressure control value is calculated accurately in consideration of the effects of a pressure wave propagation speed and a back pressure application delay, and a throttle valve is automatically adjusted and automatically controlled to actuate.