卡瓦内悬挂管柱的极限承载能力

随着油井的加深 ,作用在卡瓦和卡瓦内悬挂管柱上的载荷随之加大 ,成为制约深井油田安全生产的重要因素 .为确定卡瓦内管柱的承载能力 ,在分析美国 API及前苏联推荐公式的基础上 ,提出力学模型 ,并根据圆柱壳弯矩理论 ,用分析和求极值方法 ,找出了卡瓦内管柱的危险截面 ,得出了简单实用的卡瓦内悬挂管柱极限载荷计算公式 ,通过实例证明了该公式的准确性 .

Calculation of the Limited Load-bearing Capacity of the Pipe String Inside a Slip

With oil wells being deeper and deeper,the accurate determination of the limited load-bearing capacity become more and more important.On the basis of the analysis of API and former Soviet Union formulas used for calculation the limited load,a mechanical model was put forward. The dangerous section of the pipe string inside a slip was found out according to the bending moment theory of a cylindrical shell. A simple formula of the limited load was derived,and it can be used for well cementing design. Several examples illustrated that the calculating results of the formula are accurate.