摘要
海洋钻井过程中,井筒中钻井液温度变化规律与常规陆地钻井不同,而由于钻井液流变性主要受井筒温度变化的影响,进而会影响到钻井施工的顺利进行。为此,需要深入了解海洋钻井井筒温度变化,以井筒能量守恒关系和传热学理论为基础,建立海洋钻井井筒温度分布数学模型,并采用数值模拟方法对其进行敏感性分析,形成海洋钻井井筒温度分布研究的数学方法,得到了其敏感性影响因素及变化规律:随排量增大,泥线以上井筒温度增大,泥线以下井筒温度降低;随注入温度增大,泥线以上井筒温度升高,泥线以下井筒温度保持不变;保温层使泥线以上井筒温度变化的幅度降低,有利于钻井液性能稳定。
In offshore drilling, the variation regularity of drilling-fluid temperature is different from that in conventional drilling.The rheological property of drilling fluid dominated by the wellbore-temperature variation may impact drilling operation. So, it's necessary to make clear the variation to establish a mathematical model of wellbore- temperature distribution based on the energy conservation relation and heat transfer theory. Meanwhile, a sensitivity analysis is carried on by using numerical simulation in order to formulate a mathematical method for the temperature distribution. The variation regularities of sensitivity obtained include:(1)with the increasing displacement, the wellbore temperature above mud line increases whereas another under this line decreases(;2)as injection temperature goes up, the wellbore temperature above the mud line increases but another under this line remains the same;and(3)an insulating layer may reduce the range of temperature variation above the mud line, which is conducive to stabilizing drilling-fluid property.
出处
《天然气技术与经济》
2016年第4期36-40,82,共5页
Natural Gas Technology and Economy
基金
中国工程院-国家自然基金委联合咨询项目(L13220021)
国家自然科学基金青年基金项目(NO.51204140)资助
关键词
海洋钻井
井筒温度
海水温度
热交换
敏感性
offshore drilling
wellbore temperature
seawater temperature
heat exchange
sensitivity
