Paper: Dual-Zone Pumping with Two Pumps Actuated by One Rod String

This paper reviews our experience, dating from 1953, with dually completed wells equipped with tandem pumps (two pumps actuated by one rod string). In this span of time newer designs in dual-zone equipment and packer-tubing combinations have antiquated the initial installation. Subsurface schematic drawings depict seven deviations in equipment installed in various wells, which encompass most of the major techniques and assemblies. Commentaries on each method, which include installation and operational problems and production results from specific wells, give an insight into the applications and limitations of each assembly.