US Patent 10378305 Frac plug with retention mechanism

A slip for a downhole tool is provided. The slip may include an annular body having a first axial end, a second axial end, an inner surface, an outer surface, and an axial length. The annular embody further includes a taper on the inner surface that extends along the axial length of the annular body, and a left-hand thread pattern defined by the outer surface and extending from the first axial end along a portion of the axial length, each thread of the left-hand thread pattern having a crest that is angled toward the first axial end.