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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。
Aiming at the problem that the tubing string could be broken due to the poor design of the tubing string, the force analysis of the tubing strings in the inclined well was carried out. The formula of axial tension, external compression and internal pressure and the method of tubing string design . In the calculation of axial tension, the additional pull force generated by borehole bending is taken into account. In the design of the test tubing string, the lower column of steel grade and wall thickness of the primary election can be used anti-extrusion and anti-internal pressure of two options, and then from the two programs to select high-grade steel program; the upper column steel grade, The wall thickness and thread type are determined according to the tensile strength. Considering the habit of using the same steel grade and the same wall thickness on one trip of the test tubing string, if the upper and the lower pipe grades are higher than the lower one, the tensile strength is determined The steel grade and wall thickness are replaced by anti-extrusion or anti-internal pressure selected steel grade and wall thickness.