METHODS AND APPARATUS FOR HARVESTING POTENTIAL ENERGY DOWNHOLE

摘要

Methods and apparatus for harvesting energy while moving a tool through a well are shown and described. The harvested energy can be used by the tool to perform work once it reaches an intended location in the well, or along t he way. A considerable amount of potential energy is typically lost by oilfi eld tools as they move down through a borehole. Methods and apparatus descri bed herein recover and/or store some of the energy during the downward movem ent of the tool.