注水泥隔离液的用量及作用机理

^THE VOLUME AND ACTION MECHANICS OF SPACER DURING CEMENING

在石油固进工程中，常常需要在泥浆与水泥浆之间注入一段具有特殊技术性能的流体，即隔离液。隔离液用于注水泥作业，已广为人知。对隔离液的研究基本上是从化学角度出发，研究其化学作用机理及配方。但关于隔离液的流体力学理论，还远未成熟，如水泥浆、泥浆在隔离液中的紊流扩散问题，至今没有学者进行过详细研究。文章根据流体力学理论，建立了水泥浆、隔离液、泥浆在注水泥过程中顶替的数学模式，研究了层流隔离液及紊流隔离液的作用机理，提出了紊流隔离液用量计算公式及最小紊流接触时间计算公式。

pacer,a fluid with special technological performance,is often injected between mud and slurry during cementing.In the light of fluid mechanics theory,the mathematical displacement model of slurry,spacer and mud during cementing is sut up.The action mechanics of laminar and turbulent spacers are studied.The calculating formulae of turbulent spacer volume and the minimum turbulent contacting time are presented.