Current sucker rod pump design procedures ignore calculating and comparing the pump's maximum available compression ratio with the required compression ratio of the installation. As a result, subsurface pumps are often installed with too small of a compression ratio for the production requirement. These pumps then experience chronic gas locking problems resulting in lost production and/or premature equipment failure.

This paper points out the need to consider compression ratio in addition to properly designed down hole gas separation as a critical part of a subsurface pump's design and installation.

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