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Blowdown Feasibility for Downhill Flowlines

机译：下坡输油管的排污可行性

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摘要

Flowline depressurization ("blowdown") is an effective flowrnassurance operation to protect flowlines from hydraternformation for unplanned or extended shutdowns. Bothrnnumerical simulations and field experience have shown thatrnblowdown is generally feasible for uphill flowlines over arnwide range of gas-liquid ratios (GOR), water cuts andrnoperating conditions. It is often assumed, however, thatrnblowdown is not feasible for downhill-sloping flowlines,rnwhere liquid accumulated in the riser cannot be fullyrndischarged to reduce the flowline pressure. OLGArncalculations presented here indicate that blowdown is in factrnsuccessful for downhill flowlines, although in a more narrowrnoperating envelope than for monotonic uphill flowlines.rnRequirements for blowdown feasibility are identified over arnrange of governing parameters, including fluid GOR and waterrncut, and flowline/riser geometry (i.e. diameter, water depth,rnoffset length, inclination). Based on this generalized analysis,rnoperating strategies to increase blowdown effectiveness forrndownhill flowlines are evaluated. The impact of terrainrnslugging on blowdown feasibility, which generallyrnaccompanies flowlines with downhill inclination, is alsornevaluated. Reasonably good agreement of computationalrnresults with available deepwater field data for blowdown isrnobserved.
机译：输液管线降压（“排污”）是一种有效的流量保证操作，可保护流管线免于意外关闭或长时间停机而形成水合物。数值模拟和现场经验都表明，对于在一定范围内的气液比（GOR），含水率和高钻探条件下的上坡流水线来说，排污通常是可行的。但是，通常认为，对于下坡的流水线来说，排污是不可行的，在这种情况下，无法充分排放在立管中积聚的液体以降低流水线压力。此处给出的OLGArn计算表明，尽管在下坡流域比单调上坡流水线的狭窄范围更小，但实际上对于下坡流水线来说排污是成功的.rn在确定的控制参数范围内确定了对排污可行性的要求，包括流体GOR和断水以及流水线/上升管的几何形状（即直径，水深，偏移长度，倾斜度）。在此广义分析的基础上，评估了提高下坡流水线排污效率的合理策略。还评估了地形击打对排污可行性的影响，通常伴随着下坡倾斜的流线。计算结果与井下排泄物的可用深水场数据具有合理的一致性。

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