深冻结井筒温度场成孔弱界面分析

两个孔形成的冻结壁强度弱面通常位于两冻结孔界面上, 但对于深冻结井筒成孔孔位, 冻结壁薄弱界面选择具有一定的复杂性. 针对深冻结井筒温度场成孔弱界面, 应用数值模拟软件ANSYS分析了世界第一深冻结井筒在三个水平位置上冻结孔实际孔位下温度场弱界面参数. 结果表明: 冻结壁弱界面确定不仅要考虑成孔最大孔间距, 同时也要评定成孔孔距到设计圈径上的投影长度、相邻孔的分布特征及成孔内偏值. 首次指出成孔孔距到设计圈径上的投影长度为冻结壁弱界面评定条件之一, 具有重要意义.

Analysis of weak interface between the actual holes in deep frozen shaft temperature field

The weak interface of two holes locates on the interface of two frozen holes, but the irregularity of distribution around the design location in deep frozen shaft leads to the complexity in selection of the weak interface. For the weak interface in deep frozen shaft temperature field, with the help of the finite element method, the temperature field of the deepest frozen shaft in the world has been studied based on the actual holes in three depth levels, and the frozen wall temperature parameters of the weak interface were analyzed. It is pointed out that not only the maximum distance between holes, but also the length of the projection in designed perimeter, the inner deviation of the holes and the distribution of the adjacent holes are necessary to consider when selecting a weak interface. It is of great significance that in this paper, the length of the projection in designed perimeter is firstly pointed out as one of the factors that influence weak interface.