螺杆钻具工作特性和结构参数的分析研究

为了提高现代螺杆钻具的设计和使用水平，分析研究了螺杆钻具在空转工况、最优工况、稳定工作区边界工况和制动工况下的工作特性，以及螺杆钻具主轴转矩、工作容积、压力降、螺杆 衬套副的效率和直径过盈值等结构参数。提出了以螺杆钻具 钻头 油井系统的综合负载特性曲线作为螺杆钻具正确选择和使用的依据。为提高定向井和水平井用螺杆钻具的主轴转矩，推荐在减小工作容积的同时，增加其导程数以及减小其直径过盈值。最后建议开发设计多功能螺杆钻具，以扩大螺杆钻具在钻井和修井中的适应性以及缩减其零配件的种类和数量。

Operating characteristics and structural parameters of screw drill

To improve the design level of modem screw drills, the author discusses the operating characteristics of screw drills in various working conditions, and analyzes such parameters as the main shaft's torque, working volume, pressure drop, screw-liner efficiency and interference value of diameter. The author proposes taking the comprehensive load curve of the screw drill-drill bit-oil well system as the basis for the proper selection and use of screw drills. To enlarge the torque of the main shaft of screw drills for directional wells and horizontal wells, the author recommends increasing the number of pitches and decreasing the interference value of diameter as well as reducing the working volume of the stator and rotor.