论文部分内容阅读
在斜井抽油杆上合理布置扶正器可减缓抽油杆与油管的相互磨损，延长油井免修期，降低生产成本。采用力学分析的方法，结合井眼轨迹数据，由下到上逐跨计算了抽油杆柱的扶正器间距和轴向力。假定抽油杆柱上只有扶正器处与油管接触，通过反复试算确定了两相邻扶正器之间的合适间距、上扶正器处的轴向力和侧向力。研究结果表明，相邻两扶正器的间距取决于上述轴向力、侧向力、井眼几何尺寸、杆抗弯刚度和杆与管间隙的大小。抽油杆柱最下端作用力的大小取决于液体压强、柱塞重量、摩擦力、液体阻力和惯性。而侧向力的大小取决于井眼见何尺寸、轴向力和抽油杆重量。计算实例及现场应用均表明三维计算方法是可行的。
The rational arrangement of centralizer on inclined shaft sucker rod can reduce the mutual wear of sucker rod and oil pipe, prolong oil well repair-free and reduce production cost. The method of mechanics analysis and the data of borehole trajectory are used to calculate the centralizer spacing and axial force of sucker rod column from bottom to top. Assuming that only the centralizer contacts the tubing at the sucker rod column, the proper spacing between two adjacent centralizers, the axial force at the centralizer, and the lateral force are determined by trial and error. The results show that the spacing between adjacent two centralizers depends on the above axial forces, lateral forces, borehole geometries, rod bending stiffness and the size of the rod and tube gap. The size of the sucker rod’s lowermost force depends on the fluid pressure, plunger weight, friction, fluid resistance and inertia. The size of the lateral force depends on the hole size, axial force and sucker rod weight. Both the calculation example and the field application show that the 3D calculation method is feasible.