Patent ID: 6386322
Filing Date: 2002-05-14
Classification: E21B,F03G,F04B,Y10T

Abstract:
A pumping system for pumping fluid, comprising:a walking beam support structure; a walking beam, pivotally coupled to said walking beam support structure at a pivot point substantially central along the length of said walking beam, said walking beam having a first end adapted to engage a sucker rod string extending upwardly from a well bore; a counterbalancing weight assembly, comprising a counterbalancing weight movably along at least a portion of the length of said walking beam and a positioning device coupled to said counterbalancing weight for changing the position of said counterbalancing weight along the length of said walking beam such that movement of said counterbalancing weight along the length of said walking beam changes the center of gravity of said walking beam with respect to said pivot point, thereby actuating said pumping system.