斜井试油管柱设计

针对试油管柱设计不好就可能导致管柱断裂的问题，对斜井试油管柱进行了受力分析，给出了轴向拉力、外挤压力和内压力计算公式与试油管柱设计方法。在轴向拉力计算中考虑了井眼弯曲所产生的附加拉力。提出在设计试油管柱时，下部管柱钢级和壁厚的初选可以用抗外挤和抗内压两种方案，然后从两套方案中选取高钢级方案；上部管柱钢级、壁厚和螺纹类型按抗拉强度确定，考虑到现场一趟试油管柱使用同一钢级和同一壁厚的习惯，若上部管柱钢级和壁厦高于下部管柱，采用抗拉强度确定的钢级和壁厚代替由抗外挤或抗内压选定的钢级和壁厚。

Design of production testing string for deviated holes

Force analysis of production testing string for deviated holes is made. Equations for calculating the axial tension, external extrusion pressure and internal pressure are given, and the method for designing a production testing string is presented. The steel grade and wall thickness of the lower string can be determined by extrusion safety factor, while that ofthe upper string should be decided by the tensile strength. An example of calculation is offered.