计算膨胀管膨胀力的新方程

膨胀管技术的关键在于膨胀管的选材、螺纹联接以及膨胀机构;膨胀力是设计、验算膨胀工具强度的重要依据.在考虑钢材的性能,井眼中的管柱空间形状、膨胀工艺、膨胀芯头的锥角以及膨胀芯头与套管内壁的润滑状况等因素对膨胀力影响的基础上,结合管柱塑性性能和塑性变形理论,采用主应力法得出了计算膨胀力的解析方程,并进行了实验模拟.实验数据和理论计算结果吻合较好,证明该膨胀力计算公式是可靠的,可以应用到工程中解决实际问题.

A New Equation for Calculating Expansion Force of Expandable Casing

The key of the expandable tubular technology is dependent on the selection of material, connection and mandrel; expansion force is a base to design and check the strength of expanding tool. Considering the effect of the mechanical properties of steel, the spatial configure of the casing, expandable technology, the cone angle of the mandrel, the friction and lubrication between the mandrel and the inner wall of casing on the expansion force, the expansion force equation is put forward according to the plastic property of casing and plastic deformation theory, the equation calculating expansion force is established by using main stress method, then the expandable experimentation of casing is done, and the calculation results of the analytic model are coincident with the experiment data, which indicates the calculation model is reliable. It can be used in practical operation.