Abstract
Managed pressure drilling (MPD) is a drilling technique used to address the narrow density window under complex geological environments. It has widespread applications in the exploration and exploitation of oil and gas, both onshore and offshore. In this study, to achieve effective control of the downhole pressure to ensure safety, a gas–liquid two-phase flow model based on the drift flux model is developed to describe the characteristics of transient multiphase flow in the wellbore. The advection upwind splitting method (AUSM) numerical scheme is used to assist with calculation and analysis, and the monotonic upwind scheme for conservation laws (MUSCLs) technique with second-order precision is adopted in combination with the Van Leer slope limiter to improve precision. Relevant data sourced from prior literature are used to validate the suggested model, the results of which reveal an excellent statistical consistency. Further, the influences of various parameters in a field application, including backpressure, density, and mass flow, are analyzed. Over the course of later-stage drilling, a combination of wellhead backpressure and displacement is recommended to exercise control.
Highlights
In the oil and gas industry, the continuously increasing demand for underground resources has led to a shift in the focus on exploration and exploitation to deep or ultra-deep reservoirs
Conventional drilling is incapable of addressing these issues, and advanced technology-managed pressure drilling (MPD)
Among the based method was developed to address the convergence problem of the drift flux model by Wang different schemes, it has been confirmed that the advection upwind splitting method (AUSM) schemes
Summary
In the oil and gas industry, the continuously increasing demand for underground resources has led to a shift in the focus on exploration and exploitation to deep or ultra-deep reservoirs. MPD with the homogeneous model (HFM), two-fluid modelthe (TFM), and drift flow model (DFM). Phase, is incapable of ensuring accuracy in reflecting the flow characteristics of each phase, and its and its calculation accuracy is less than satisfactory; it is rarely applied nowadays. Gas-kick detection and parameter estimation [21,22,23,24] These models give no consideration to these models give no consideration to how the characteristics of various parameters, which are how the characteristics of various which areMPD, primarily used for automation and are not primarily used for automation andparameters, are not suited to fine are distributed in the wellbore.
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