Correlations of fire-induced temperature have been reviewed and revisited.The impact of XY factors,i.e.,the relative locations of the fire source and vent,on temperature models of ceiling-vented compartments could be ...Correlations of fire-induced temperature have been reviewed and revisited.The impact of XY factors,i.e.,the relative locations of the fire source and vent,on temperature models of ceiling-vented compartments could be reflected by the exponents of the two dimensionless terms which represent the ratio of the total energy to energy released through the ceiling vent,and the ratio of the energy lost through the walls to the energy released through the ceiling vent.For fires not located directly below the ceiling vent,the temperature rise was proportional to two thirds of the power of the heat release rate,while for fires immediately beneath this vent,the temperature rise was proportional to four thirds the power of the heat release rate,and was inversely proportional to one sixth the power of the ceiling vent size.展开更多
文摘合成基钻井液(synthetic-based mud,SBM)是用于海洋深水油气资源开发的重要工作流体,其高温高压流变特性直接影响着深水油气井建设及后续生产。以南海B气田群合成基钻井液为典型体系,检测了合成基钻井液高温高压流变参数,分析了体系高温高压(high temperature high pressure,HTHP)流变特性,比较了在一定温压条件下常规流变模型适用性,并探索了温度(T)/压力(P)因子修正法在高温高压流变关系构建中的应用。结果表明,在60~150℃、13.8~82.7 MPa范围,3~6 r/min低剪切读数分布呈“袋”状,而100~600 r/min中高剪切读数分布呈“片”状;高温(high temperature,HT)与高压(high pressure,HP)对合成基钻井液流变性的影响相反,且温度影响高于压力,高压增稠作用可以部分抵消高温对流变的影响;常规流变模型τ(γ)的拟合结果为:宾汉模型<幂律模型≈卡森模型<赫歇尔-巴尔克莱≈罗伯逊-斯蒂夫模型,确定幂律模型为合成基钻井液的常规流变模型;通过Arrhenius近似式引入温度/压力因子修正黏度和流变模型,并建立了高温高压流变动力学方程,偏差异常点集中在低剪切速率,且平均偏差7.57%±7.17%,构建高温高压流变分析模型的预测精度高,满足了现场应用要求,可为深水钻进中合成基钻井液的流变调控提供重要数据支持。
基金supported by the Anhui Provincial Natural Science Foundation(1408085MKL94)
文摘Correlations of fire-induced temperature have been reviewed and revisited.The impact of XY factors,i.e.,the relative locations of the fire source and vent,on temperature models of ceiling-vented compartments could be reflected by the exponents of the two dimensionless terms which represent the ratio of the total energy to energy released through the ceiling vent,and the ratio of the energy lost through the walls to the energy released through the ceiling vent.For fires not located directly below the ceiling vent,the temperature rise was proportional to two thirds of the power of the heat release rate,while for fires immediately beneath this vent,the temperature rise was proportional to four thirds the power of the heat release rate,and was inversely proportional to one sixth the power of the ceiling vent size.
