The Effect of Boost Flow in Riser on the Wellbore Temperature in Deep Water Drilling
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摘要: 由于受深水低温特性的影响,深水钻井中,井筒流体温度分布的计算与陆地钻井中井筒流体温度分布有所不同。隔水管增压管线排量的存在使流体温度进一步降低,因此深入了解增压管线内排量对深水钻井井筒流体温度分布的影响规律十分重要。基于无隔水管增压排量下深水温度分布的计算方法,考虑突扩孔道流动的问题,结合热力学相关理论,对加隔水管增压管线排量时的深水钻井井筒流体温度分布进行了研究,建立了该情况下温度分布的预测方法,得到了井筒流体温度分布。研究结果表明:隔水管增压管线排量对深水井筒流体的温度分布影响明显,且影响区域较大;较管柱而言,增压排量对环空内井筒流体温度场分布的影响更为明显;因钻井液和流动方向的不同,较环空而言,管柱内钻井液温度受增压排量的影响更深。因此,研究深水钻井中的深水温度分布时,隔水管增压排量的影响必须加以考虑。Abstract: Low temperature in deep water drilling makes the wellbore temperature distribution different from that in onshore wells,and the fluid in boost line makes the wellbore temperature lower.So it is necessary to understand the effect of the flow rate in boost line on borehole temperature distribution.Based on the calculation method of deep water temperature field without boost flow in riser,the wellbore fluid temperature field in deep water drilling with boost flow in riser was studied while considering the issue of expansion channel flow and combining related theories of thermodynamics,and the method to predict temperature field was established.The results showed that boost line had significant influence on the distribution of wellbore fluid temperature in deep water drilling with large influencing range,the boost line had more obvious influence comparing with pipe string,the influence of boosted flow on drilling fluid temperature was even deep into the formation resulting from different level of drilling fluid in annular and string.Therefore,the influence of boosted flow must be considered in deep-water temperature distribution in deep water drilling.
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Keywords:
- deep water drilling /
- riser pipe /
- drilling fluid /
- flow rate /
- temperature distribution
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