Sucker rod dual-thread anti-disengagement device

Abstract

The invention provides a sucker rod dual-thread anti-disengagement device which comprises a male thread buckle, a female thread buckle, a ring cap with oblique conical teeth, a conical tooth anti-retreat gasket and a spring. A thread in the direction opposite to the detaching direction of the female thread buckle is formed in the outer surface of the female thread buckle and matched with the ring cap. The ring cap is installed at one end of the male thread buckle. The ring cap can move up and down on a screw when not buckled. One end of the spring is fixed to a male screw, and the other end of the spring is fixed to the conical tooth anti-retreat gasket. The conical tooth anti-retreat gasket is matched with the oblique bevel teeth at one end of the ring cap. When a sucker rod works and the transverse torque exists, due to the fact that the direction of the thread of the female thread buckle is opposite to the detaching direction of the thread in the outer surface of the female thread buckle, when one thread has unbuckling tendency, the other thread has buckling tendency, and the two threads act on each other and are prevented from being disengaged; the spring and the conical tooth anti-retreat gasket are used for preventing the ring cap from disengagement. The original weight of the sucker rod can not be changed, and the anti-disengagement aim is achieved when the two threads restrain each other.

Description

technical field [0001] The invention belongs to a double-thread anti-off device for sucker rods, in particular to a double-thread locking device. Background technique [0002] The sucker rod used in the rod pumping system is to use the traditional sawtooth thread to transmit the load through the two sections of the collar and the shoulder of the male buckle under the tension of the thread to generate contact friction. Threads are only subjected to axial loads, i.e. forces perpendicular to the thread direction. When used in heavy oil wells or directional wells, the sucker rod will rotate due to the friction between the sucker rod and the heavy oil or the sucker rod and the oil pipe along the circumferential direction of the sucker rod, which will easily cause the thread of the sucker rod The connection strength of the sucker rod is reduced, and the accident of sucker rod breakage occurs, which seriously affects the operation of the sucker rod pumping system. [0003] At pre...

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a sucker rod double-thread anti-off device, which aims to solve the problem that the connection of the existing sucker rod is prone to slipping and shackle under the action of circumferential inertial force, and at the same time make the connection of the sucker rod tighter and firmer

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