An implementation of a genetic algorithm for the n/m/P/Cmax sequencing problem is presented, and two performance enhancements hybridisation with a local search algorithm, and a `string fridge` are evaluated. This implementation is then extended to allow the genetic algorithm to optimise the placement of additional processing units to enhance productivity, and to meet order deadlines. Finally, p...

Estimating the oil-water temperatures in flowlines is challenging especially deepwater and ultra-deepwater offshore applications where issues of flow assurance dramatic heat transfer are likely to occur due temperature difference between fluids surroundings. Heat analysis very important for prediction prevention deposits oil water flowlines, which could impede give rise huge financial losses. T...

Within two hours after discharge began, for a production test in 1989 of well ZCQ-4, pressure variations changed from approximately sinusoidal to a cycle of sudden and complex peak discharge pressures, to 9 bar, separated by irregular pressure declines to 5 bar. Initial cycle periods of 42 minutes evolved to 150 minutes by day 20 of continuous testing, when three of four surge peaks were well s...

Slugging flow poses significant challenges to the offshore multiphase flowline and riser systems. Slug is characterized by an uneven regime whereby pipeline pressures, temperatures, or volume rates fluctuate. One of most common causes severe slugging low pressures which buildup fluid over time, consequentially pressure oscillations. This mostly occurs in vertical risers wells. The negative effe...

Pipeline transportation of multiphase products, such as gas and oil mixtures, exhibits complex varying flow regimes: a result, analytical approaches or conventional methods cannot accurately describe the composition propagation characteristics fluid mix inside system itself. We address an issue by presenting methodology, driven data applied to real case history, where basic pressure transients ...

The origin of supraglacial debris covers is often conceptualised as the formation a surface lag by melt-out englacial from slow-moving ice, where complexity arises feedback between thickness and sub-debris ice melt. Here, we examine cover perspective provenance changing tributary supply in high-elevation compound valley glacier. Geochemical analysis 11 major elements 21 samples six tributaries ...

Abstract. Gas isotope thermometry using the isotopes of molecular nitrogen and argon has been used extensively to reconstruct past surface temperature change from Greenland ice cores. The gas ratios δ15N δ40Ar in core are each set by amount gravitational thermal fractionation firn. component is proportional firn thickness, difference between top bottom column, which can be related change. Compa...

Located on the northwest coast of Ross Island in McMurdo Sound, Cape Bird features virtually unweathered surface drift with erratics from the Transantarctic Mountains (TAM) and with enclosed marine shell fragments. This Cape Bird drift is cut by Holocene beaches. The chronology of drift deposition and beach formation comes from AMS radiocarbon dates of associated marine shells, and of penguin b...