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径向水平钻井技术是开发油田的一种新技术，钻杆在经过斜向器时曲率半径反复变化，钻杆处于应力—塑性应变状态。钻杆截面变形量大小及斜向器弯道阻力的大小对能否正常钻进至关重要。分析了钻杆截面的应力—应变关系，在假定钻杆为理想刚塑性材料的条件下，推导出了钻杆截面的长、短轴极限变形量及钻杆转弯时的阻力计算公式，分析了滑道摩擦系数、射流反力对阻力的影响，从三种条件下公式的计算结果与实验对比中可证明这些公式的正确性，对斜向器的设计和钻杆的选材以及确定实际钻进的工作参数具有指导意义。
Radial horizontal drilling technology is a new technology for oilfield development. The radius of curvature changes repeatedly when the drill pipe passes the skew device, and the drill pipe is in the stress-plastic strain state. The amount of deformation of the drill pipe section and the size of the beveling resistance of the beveller are crucial to the normal drilling. The stress-strain relationship of the section of the drill pipe is analyzed. Under the condition that the drill pipe is an ideal rigid plastic material, the formulas of the long and short-axis deformation of the drill pipe section and the resistance of the drill pipe during turning are deduced. Slide friction coefficient and jet reaction force on the resistance. The correctness of these formulas can be proved from the comparison between the calculation results of the formulas under the three conditions and the experiments, the design of the skew-gear and the selection of the drill pipe, and the determination of the actual drilling The working parameters are instructive.