新开发研制的碳纤维复合柔性连续抽油杆克服了普通钢杆的缺点，能够满足低渗油田小泵深抽技术的要求。
The new developing carbon fiber compound flexible coiled rod overcome the shortcoming of ordinary steel rod, can meet the need of low permeability oilfield production.
应用第四强度理论，求解杆柱在扭矩和轴向力条件下的复合应力，设计抽油杆柱。
Rod strings are designed by computing compound stress with the fourth strength energy on the condition of torque and axial force.
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