Method and apparatus for accumulating liquid and initiating upward movement when pumping a well with a sealed fluid displacement device

摘要

Liquid is accumulated above fluid displacement device which is moveable and sealed within a production chamber defined by a production tubing, and upward movement of the fluid displacement device is initiated to pump liquid and gas from a well, by different magnitudes of differential pressure created at the well bottom. Preferably the different magnitudes of differential pressure are created by fluid passageways having different cross-sectional areas.