VALVE MEANS HAVING MULTIPLE SEATS FOR SUPPORTING AND LOCATING SUBMERSIBLE PUMPS IN DEEP WELLS

摘要

A well pumping system operative selectively to pump fluids (1) through the production tube and the annular space between the production tube and the well casing simultaneously (2) through the production tube solely or (3) through the annular space solely, without having to pull the rod string and/or the tube string.