Abstract
The exploration and development of offshore oil and gas has greatly alleviated the tension of international energy consumption, however, the complex geological and engineering conditions of offshore drilling lead to complex downhole accidents such as overflow and kick when the wellbore pressure regulation accuracy is poor in offshore drilling. Well killing technology is the primary well control means after oil and gas well overflow and blowout And the accuracy, real-time and intelligence of wellbore pressure calculation will directly affect the construction period and even the success or failure of well killing. The existing wellbore multiphase flow model still has uncertain parameters depending on the empirical equation determined based on laboratory experiments, and generally lacks real-time interaction with the physical parameters of the drilled formation and the physical parameters of the intrusive fluid under wellbore conditions, which makes the multiphase flow model have the defect of poor pertinence to the formation characteristics and wellbore fluid information at the drilling well formation. In this paper, the differences between the simulation data of multiphase flow model under overflow and circulating well killing conditions and the trend of real-time data at drilling platform, seabed position and bottomhole monitoring points are analyzed. The key parameters of multiphase flow model relying on Laboratory experiment are corrected by real-time inversion. Based on the original universality, the annulus multiphase flow model further highlights the pertinence to the formation characteristics and intrusive fluid characteristics of the drilled section, which is of important guiding significance for the safe and effective conduct of offshore drilling.
NSTL