摘要
准确的预测钻井液循环温度对钻井作业安全、快速钻进具有十分重要意义。文章根据热力学第一定律及传热学的基本原理,考虑了钻井液传热受流动影响,建立了钻井液与地层之间的二维非稳态循环温度数学模型,模型通过优选钻井液流变模式,精确计算钻井液流变参数,并采用无条件稳定的全隐式有限差分法求得模型的数值解,提高了预测精度。最后用现场实测数据与模型计算数据进行了对比分析,验证了该模型的可行性和准确性。该模型可用于计算实际循环条件下的管柱内钻井液、管壁、环空钻井液与地层的温度分布,为准确预测钻井安全密度窗口和钻井液设计提供基础数据。
It is of great significance for drilling safety and rapid drilling to accurate prediction of drilling fluid circulating temperatures in drilling processes.In the paper,according to first law of thermodynamics and thermodynamical basic principles,and considering the effect of drilling fluid heat transfer on the drilling fluid flow,a 2-D transient mathematical model of drilling fluid circulating temperatures is established between mud fluid and formation.Optimize drilling fluid rheological model and accurate calculation of the rheological parameters,and then numerical solution is obtained by the use of uncondionally stable full-implicit finite difference method,enhances the accuracy of predicting the drilling fluid circulating temperatures.Then through the analysis and comparison of the drilling fluid circulating temperatures measured and calculated by the model,the feasibility and accuracy of the model are verified.The mode may be used for calculating the temperatures of drilling fluid,pipe wall,annular fluid and formation under the condition of circulating,thus laying basic data for the prediction of secure density window and mud fluid designs.
出处
《新疆石油天然气》
CAS
2011年第4期28-32,106-107,共5页
Xinjiang Oil & Gas
关键词
钻井
钻井液
循环温度
数学模型
Drilling
drilling fluid
Circulating temperature
Mathematical model
