Abstract
Abstract A correlation for transient gas solubility under pumping conditions has been developed which improves the prediction of volumetric and work efficiencies for sucker rod pumps with gas interference. Due to the reciprocating action of the rod pump, natural gas is forced into solution during the downstroke and out of solution during the upstroke. Throughout the pump cycle, the gas phase never reaches an equilibrium with the liquid phase. This paper presents experimental results quantifying the rate of natural gas solubility into and out of the oil phase under turbulent conditions. A new equation for two-phase volumetric efficiency in sucker rod pumps has been derived using transient gas solubility, gas compressibility, and gas-liquid gravitational separation. In addition, the work efficiency of the pump has also been analyzed using the transient gas solubility equations.
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