整体钻柱的受力与变形分析

ANALYSIS OF THE FORCE AND DEFORMATION ALONG THE WHOLE DRILLSTRING

利用有限单元法，建立了整体钻柱的受力与变形分析模式。用这一模式计算了一口水平井在其增斜段钻柱全长的受力与变形，对钻柱全长的受力与变形分析结果与仅取下部钻具组合时的分析结果进行了对比．算例表明，整体钻柱的受力分析结果是合理的。首次计算出实际井眼中钻柱整体的受力与变形状况，对于合理设计定向井或水平井的钻柱与下部钻具组合有一定的参考价值。该方法同样适用于对套管柱进行受力与变形分析。

A model for analysing the force and deformation along the whole drilling isdeveloped by using the finite element method. The force and deformation of the drillstring in ahorizontal well are computed.The hook loads,as well as the contact state between thedrillstring and well wall,can be observed.The non-linear analyses of bottom- hole assemblysare made and the results are compared with the linear results,The computation about the forceand deformation of the whole drillstring in an actual wellbores has a certain reference valuefor design of drillstring.The method presented in the paper can also be used to the analysis ofcasingstring。