Liquid loading is the accumulation of liquid at the bottom of gas wells occurring at the end of field life. Surfactant injection is a common way to deliquefy these wells. In this work, a model of a sandbox, an inflow zone and a tubing is used to study deliquification. This experimental setup allows studying batch surfactant injections. For these injections a trade-off is found: at high concentrations deliquification persists longer, but the large amount of foam initially leads to lower gas production. At lower concentrations the surfactants are effective for a shorter duration, but the initial production gains are greater.

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