判别液体流态的层流稳定性理论

LAMINAR FLOW STABILITY THEORY FOR DISTINGUISHING LIQUID FLOW REGIME

准确判别井内液体的流态 ,对钻井优化设计和施工、保证注水泥顶替质量是非常重要的。文中介绍了以层流稳定性现象理论为基础提出的 5个使用较广的流态判别准则———雷诺数 (Re)、稳定性参数Z、稳定性参数K、稳定性参数X和稳定性参数Y。通过对这 5个流态判别准则的分析与对比 ,认为雷诺数、稳定性参数Z与K都存在不足 ,而稳定性参数X、Y更具合理性。建议将稳定性参数X、Y进行推广 ,使它们能够用于其它非牛顿液体圆管流、同心环空流、偏心环空流的流态判别。

Accurately distinguishing the flow regime of the liquid in well is very important for optimizing drilling design and operation and guaranteeing cement replacement quality.In this paper,the common five criteria for distinguishing flow regime—Reynolds number (Re) and stability parameters (Z),(K),(X) and (Y),are presented on the basis of the laminar flow stability theory.Through analysis and comparison of the five criteria for distinguishing flow regime,it is considered that the Roynolds number and stability parameters Z and K are all unperfect,but the stability parameters X and Y are relatively rational.The authors suggest spreading the stability parameters X and Y,enabling them to be used for distinguishing the flow regime of the circular pipe flow,concentric annular flow and eccentric annular flow of other non-Newtonian liquids.