| 摘要 |
A safe backspin device is provided to prevent uncontrolled backspin during operation of a progressive cavity pump. The safe backspin device has a bore and in one embodiment a ball that seats within the bore that act as a check valve. The check valve allows for unrestricted fluid flow in a normal flow direction. Fluid bypass ports allow for a restricted and controlled flow of fluid when the fluid direction of the progressive cavity pump is reversed from the normal flow direction. The bypass ports may be angled to clear sand buildup around an intake of the progressive cavity pump and in an annulus outside of a safe backspin device within a wellbore. In alternative embodiments a flapper valve may be used instead of a ball.
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