دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

the area surrounding a well within which drawdown and production has changed the saturation and energy of the system.

critical drawdown pressure;maximum drawdown pressure for sand free rate.

a relative permeability effect where condensate, usually hydrocarbon, drops out of the vapor phase around the wellbore when the pressure drops below the dew point in response to drawdown or depletion. Gas rates can be severely reduced by the permeability

various. Usually the sand free rate, but may also include a rate to achieve cleanup in special cases.

n: I. the difference between static and flowing bottomhole pressures. 2. the distance between the static level and the pumping level of the fluid in the annulus of a pumping well.

the difference between two pressures. Completion drawdown is the pressure differential from the formation near the wellbore to the wellbore.

ideal drawdown / actual drawdown.

a flow test in which the flow rate is measured at four drawdowns to estimate how skin changes at each rate. Useful for identifying non Darcy skin or turbulent skin.

gas from a fee gas cap that goes downward toward the top perforations in response to a drawdown.

abbr: inflow performance relationship.

inflow performance relationship. The relationship that shows inflow as a function of drawdown. Changes with time.

n: a short-time backpressure test for low-permeability reservoirs that otherwise require excessively long times for pressure stabilisation when wells are shut in.

a multi-rate drawdown and build-up test with different drawdowns of the same duration but buildups reaching stabilization.