Research on Intelligent Assisted Well-Killing System for Gas Influx and Blowout

As China's oil and gas exploration and development gradually shifts to deep layers, deep seas, and unconventional sources, the formation anomalies become more complex, which poses great well control risks for oil and gas production. Well-killing is the core of well control safety technology. The current technology has technical problems such as low prediction accuracy of wellhead pressure, long control response time, and low degree of intelligence, which restricts the development of well control technology. This article systematically develops a prediction model for the development of multiphase flow in the wellbore and an analysis method for pressure response based on the well killing conditions during gas invasion and overflow. It proposes an operational logic for solving the mathematical model of dynamic response of wellbore pressure, establishes a calculation model for unconventional dynamic pending boundary, and forms a smart assistant well killing system for gas invasion and overflow. The results show that the model in this article is closer to the measured data, with a maximum error of 1.26% (0.08MPa) in wellhead casing pressure value, and the peak time is only 2 minutes ahead of the measured data. At the same time, the response time of the smart assistant well killing system is less than 2 seconds. The analysis results are close to engineering reality, and the response time of the smart assistant well killing system is timely. This has important engineering significance for reducing well control risks, promoting oil and gas resource development, and ensuring energy security.