CAJ | 학술논문

保持注水泥顶替界面稳态可有效保证注水泥顶替效果。该文以非牛顿流体在井眼环空流动特性为基础，参考顶替界面处的连续性条件，对建立的偏心环空注水泥顶替界面理论模型进行分析和有限差分求解。结果表明：在大斜度井内，一定的套管偏心可抑制水泥浆在环空低侧宽间隙内的突进，有利于保持顶替界面的稳定。该模型适用于不同井斜角条件偏心环空内的注水泥顶替界面形态，可为注水泥顶替参数和流体性能参数优化设计提供一定的理论依据和参考。
보지주수니정체계면은태가유효보증주수니정체효과。해문이비우돈류체재정안배공류동특성위기출，삼고정체계면처적련속성조건，대건립적편심배공주수니정체계면이론모형진행분석화유한차분구해。결과표명：재대사도정내，일정적투관편심가억제수니장재배공저측관간극내적돌진，유리우보지정체계면적은정。해모형괄용우불동정사각조건편심배공내적주수니정체계면형태，가위주수니정체삼수화류체성능삼수우화설계제공일정적이론의거화삼고。
Keeping cementing displacement interface steady can guarantee cementing quality effectively. Based on non-Newtonian fluid flow characteristics in the annulus, the displacement interface theoretical model is founded after the continuity conditions are considered. The model can be solved by finite difference method and the results show that a certain casing eccentricity can stop the fingering in the widest annular gap (usually at the low of the wellbore) and help maintain the displacement interface stability in highly deviated well. The displacement interface model can be used to imitate displacement interface states in eccentric annulus of wellbores with different deviation angles, which offer certain theoretical foundation and reference for optimizing designs of the displacement parameters and performance parameters.