SUCKER ROD APPARATUS AND METHOD

摘要

Sucker rods include end fittings having an outer wedge portion proximate to an open end, an inner wedge portion proximate to a closed end, and an intermediate wedge portion between the outer and inner wedges. Each wedge includes a leading edge, a trailing edge, and an angle between the leading and trailing edges. The triangular configuration, length of the leading edge, the length of the trailing edge, and size of the angle in each wedge portion cause distribution of force, such that compressive forces distributed to the rod proximate the closed end exceed compressive forces distributed to the rod proximate the open end.

主权项

1. An end fitting for a sucker rod comprising:
a body comprising a cavity and an interior surface, a closed end, and an open end, wherein the interior surface of said cavity comprises a plurality of leading sections and a plurality of trailing sections, wherein each of the plurality of leading sections diverge away from said sucker rod to form a leading length from the open end to the closed end, wherein each of the plurality of trailing sections converge towards the sucker rod to form a trailing length from the open end to the closed end, wherein each of the leading lengths is longer than each of the trailing lengths, wherein the respective leading length of each respective leading section of the plurality of leading sections decreases from the open end to the closed end, and wherein the respective trailing length of each respective trailing section of the plurality of trailing sections decreases from the open end to the closed end.