LedaFlow? is a new transient multiphase flow simulator which includes 1D multi-fluid models consisting of mass,rnmomentum and energy conservation equations for each field (continuous, bubble and droplet), as well as compositionalrntracking. In this paper, a new method called Slug Capturing is employed for slug flow, and the results analyzed and comparedrnwith the field data of two different fields. Additionally, for some cases, differences between the new simulator and anotherrncommercially available transient code results are compared and analyzed.rnThe first case corresponds to the production of a TOTAL-operated field in the UK. Produced fluids from the wells arerntransported through a 21 km long, 16-inch multiphase flowline from the well platforms to the central receiving facilities. Thernmultiphase line (gas/oil/water) must be operated in a narrow range of pressure and flow rate conditions in order to avoidrnsevere slugging issues. Flow patterns are compared for various water cuts and superficial gas velocities. When severernslugging is observed, slug characteristics (frequency, length) are analyzed and compared to simulator predictions.rnThe second case is from a CONOCOPHILLIPS-operated North Sea asset. The 3-phase, 18-inch ID oil flow line runs 3.7rnkm from a wellhead platform to a central processing platform. The line drops approximately 6 m over the last 3 km beforernflowing up a 130 m riser. The pipeline exhibits severe riser slugging which is not adequately modeled by conventionalrntransient models, due to the complex interplay between hydrodynamic and riser slugging, as well as 3-phase effects. Slugrnfrequencies and lengths are analyzed and compared to predictions.
展开▼
