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首页> 外文会议>North American Society for Trenchless Technology (NASTT) no-dig show >Parametric Study of Pullback Forces on Pipelines Installed by Horizontal Directional Drilling (HDD)
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Parametric Study of Pullback Forces on Pipelines Installed by Horizontal Directional Drilling (HDD)

机译：水平定向钻井（HDD）安装在管道上的拉回力的参数研究

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摘要

This paper reviews the design parameters for the pullback force calculation during Horizontal Directional Drillingrn(HDD) method. A comparison was made between actual measured pullback forces and theoretically calculatedrnvalues for over fifty HDD projects. The study showed that the measured pullback forces were higher than therntheoretically calculated forces for small HDD installations, while the results were reversed in the case of mediumrnand particularly large HDD projects. Among many factors affecting pullback force, the design values for soilrncoefficient of friction, fluidic drag coefficient, drilling mud density and roller coefficient of friction are oftenrnassumed the same in the calculation for all different HDD projects.rnA parametric study was carried out to show the significance of these design input values in the pullback forcernestimation. Comparison of the results with the actual recorded pullback forces suggested modifying the designrnvalues based on the specific design case in order to enhance the accuracy of theoretical calculations. Design ofrnExperiment (DOE) methodology was also used to further study the significance of design parameters on pullbackrnforce. The study showed that the order of significance of the design parameters varied for different case studies andrnthe impact of one factor on pullback force is relatively independent of the level of the other factors.
机译：本文综述了水平定向钻进（HDD）法计算拉拔力的设计参数。对超过50个HDD项目的实际测得的拉回力与理论计算的值进行了比较。研究表明，对于小型硬盘驱动器，测得的拉回力高于理论计算的力，而对于大型硬盘驱动器项目，其测量结果则相反。在影响拉力的众多因素中，对于所有不同的HDD项目，在计算中经常会得出土壤摩擦系数，流体阻力系数，钻探泥浆密度和压路机摩擦系数的设计值是相同的。这些设计输入值在拉回式预测中的作用。将结果与实际记录的拉回力进行比较，建议根据特定的设计案例修改设计值，以提高理论计算的准确性。实验设计（DOE）方法也被用来进一步研究设计参数对拉回力的重要性。研究表明，对于不同的案例研究，设计参数的重要性顺序各不相同，并且一个因素对拉力的影响相对独立于其他因素的水平。

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