摘要
由于海水的冷却作用,水下采油树系统中的原油容易结蜡或形成水合物,并发生沉积,甚至堵塞流道,严重影响油气田安全高效经济运行。在概述水合物主要防治技术的基础上,建立了水下采油树内部管道传热模型,定义了流固耦合界面,分别模拟无保温层时原油在5、10和20m/s这3种初始速度下进入内部管道后的传热情况,探讨了海水冷却作用的影响。研究结果表明,原油必须以一定速度流经管道,这样一方面可以避免温度下降过快导致流体黏度上升和流速变慢,另一方面原油以一定速度流经管道可以将边缘将要成核或已经成核但尚未成团的水合物带走,不至于逐渐积聚成块。
Due to the cooling effect of the seawater, the oil in the subsea tree system is prone to wax or hydrate and deposit, or even blocked the flow channel under a serious condition, which seriously affect the safety, efficiency and economy of operation of oil and gas fields. The overview of main hydrate control technologies is intro- duced. The heat transfer model of the subsea tree inner flow tube is established and the fluid-structure interaction interface is defined. Heat transfers of oil in the inner flow tube without insulation layer with the initial inflow rates of 5, 10 and 20 m/s are simulated. The results show that the crude oil flow rate should no less than a certain value, so as to avoid a quick temperature drops which usually result in increased oil viscosity and low flow rate, and take away the nearly nucleated or nucleated hydrate on the tube wall, thus avoiding hydrate accumulation.
出处
《石油机械》
2015年第5期49-52,共4页
China Petroleum Machinery
基金
国家863计划项目"水下卧式采油树系统研制"(2012AA09A204)
关键词
水下采油树系统
内部管道
水合物
传热
流速
数值模拟
subsea tree system
inner flow tube
hydrate
heat transfer
flow rate
numerical simulation
