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Foam Depression Tests

A foam depression test is recommended to calculate the producing pressure and/or the inflow performance relationship. The report includes pressure at reference depth, graph of gas-liquid interface pressure, liquid gradients, calculations and results of gas and liquid column pressures. The purpose of foam depression test is: In order to accomplish this, the fluid level is changed by closing the casing valve at surface to increase the pressure exerted by the gas column. Because the pump unit operation is not interrupted, no production downtime is involved. The fluid gradient is established by accurately recording the Casing Pressure and Corresponding fluid level at various time intervals after closing the casing. The wellbore storage capacity is sufficient in most cases to conduct depression testing without altering the production rate at the formation.

The rate of free gas flowing up the casing has a significant impact on the fluid gradient. The amount of free gas produced up the casing is related to: There are several factors which can result in an unsuccessful Foam Depression test: Fluid Level Pressure Gradients 1 kPa/m being light foam and 10 kPa/m being solid water

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