Internally-wound stop ring

Abstract

The present invention discloses an internally-wound stop ring, including an inner ring 1 and an outer ring 2 connected internally and externally by threads, a wound inclined surface 3 is provided at an end of an outer surface of the inner ring, the wound inclined surface is provided with a cut-off groove 7, the outer surface of the inner ring is further provided with an external thread, and resistance-increasing annular teeth 5 are provided at a position corresponding to the wound inclined surface on an inner surface of the inner ring; an end of the outer ring is provided with a hook spanner operating hole 6 along a circumference of the outer ring, and an inner surface of the outer ring is provided with an internal thread and a pressing inclined surface, respectively; and the internal thread of the outer ring is fitted with the external thread of the inner ring, the pressing inclined surface 4 of the outer ring and the wound inclined surface of the inner ring are correspondingly in contact with and pressed against each other, and the pressing inclined surface and the wound inclined surface are tapered surfaces having a consistent taper. The present invention adopts a winding clamping solution during well cementing operations. Figure 1