循环条件下超临界二氧化碳对定向井管柱的屈曲影响分析
首发时间:2016-11-14
摘要:本文研究在循环条件下超临界二氧化碳对定向井管柱的屈曲影响。通过建立与超临界二氧化碳相关的温度,压力,粘度,密度等物性参数模型,结合定向井管柱的屈曲计算公式,计算出定向井管柱在超临界二氧化碳中的临界屈曲压力,并与在常规钻井液条件下和无钻井液条件下的管柱受力情况进行对比,从而得出超临界二氧化碳对定向井管柱的屈曲影响。通过计算得到:(1)在定向井造斜段初始下凹弯曲管柱的屈曲临界载荷比直井中的大,即不易弯曲。(2)超临界二氧化碳在不同初始质量流量下对管柱的临界屈曲压力影响较小,随着初始质量流量的增加临界屈曲压力略微减小。(3)超临界二氧化碳与无钻井液及常规钻井液相比,在上部钻杆段临界屈曲压力差别不大,在下部钻铤处区分明显,超临界二氧化碳的临界屈曲压力小于无钻井液条件下的临界屈曲压力,大于常规钻井液下的临界屈曲压力。
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Supercritical carbon dioxide under cyclic conditions buckling analysis of directional drilling string
Abstract:The effect of supercritical carbon dioxide on the buckling of directional well string under cyclic conditions is studied. By setting up a model related to supercritical CO2 such as temperature, pressure, viscosity, density and other physical parameters, combining buckling calculation formula of directional well string and comparing it with that under normal drilling conditions and without drilling fluid And then the influence of supercritical carbon dioxide on the buckling of the directional well string is obtained. (1)The critical buckling load of the bow pipe is larger than that in the vertical well, that is, it is not easy to bend. (2)The critical buckling pressure of the supercritical carbon dioxide has little influence on the critical buckling pressure of the column at different initial mass flow rate, and the critical buckling pressure decreases slightly with the increase of the initial mass flow rate. (3)The critical buckling pressures of supercritical carbon dioxide are different from those of the conventional drilling fluid and non-drilling fluid. The critical buckling pressure of the supercritical carbon dioxide is less than that of the non-drilling fluid The buckling pressure is greater than the critical buckling pressure under the conventional drilling fluid.
Keywords: Fluid mechanics Supercritical Carbon Dioxide properties column buckling.
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No.4707947116867114****
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循环条件下超临界二氧化碳对定向井管柱的屈曲影响分析
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