In this situation, accurate dew point measurement and equally accurate modeling of the measured dew point should be given due attention.Ībouzar Choubineh. Thus an accurate description of the dew point pressure will have an impact on the prediction of initial oil and gas in place, placement of delineation wells, and potential field development strategy. It is not uncommon that a predicted GOC may vary tens of meters per bar of uncertainty in the (PVT model) dew point pressure. In this case, the PVT model dew point should be tuned precisely to an accurately measured dew point pressure. Second, when the bottomhole flowing pressure drops below the dew point and two phases start flowing near the wellbore, gas relative permeability drops and well productivity drops.Īnother (less common) need for dew point pressure is when an underlying saturated oil zone may exist, and a PVT model is used to predict the existence and location of the gas–oil contact (GOC). In fact, knowledge of the specific dew point at all as long as the variation of composition (C 7+ content) with pressure is well defined “near” the thermodynamic dew point. First, in the context of compositional variation with pressure (and associated variation of condensate yield with pressure) accurate determination of the thermodynamic dew point pressure is not of particular importance.
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The importance of the actual dew point pressure will vary from reservoir to reservoir, but in most situations accurate dew point determination is not important. These two changes can have a profound effect on reservoir and well performance-or, they may have little impact. Practically, the dew point marks the pressure where (1) reservoir gas phase composition changes and becomes leaner and (2) condensate accumulation starts in the reservoir. The dew point pressure is the pressure where an incipient liquid phase condenses from a gas phase. Speight Ph.D., D.Sc., in Natural Gas (Second Edition), 2019 9.5.5 Dew point pressure The next section summarizes the use of these distinct correlation types.
#DEW POINT FORECAST FULL#
These correlations can be grouped in three categories: (1) correlations that depend on full composition information (2) correlations that depend on gas specific gravity and field information and (3) correlations that depend on downhole composition information. Several correlations are available to calculate dew point pressure from basic information.
In general, the production stream becomes leaner with lower amounts of heavier hydrocarbon components. The composition of the produced well stream changes when reservoir pressure falls below dew point pressure. Knowledge of dew point pressure (at reservoir temperature) is necessary in production of gas condensate reservoirs. Dew point pressure usually refers to dew point pressure at reservoir temperature, unless another temperature is specified. The phase envelope for a typical gas condensate shows that the dew point pressure is a function of the temperature. Ahmed El-Maraghi, in PVT Property Correlations, 2018 Dew Point Pressureĭew point pressure is defined as the pressure at which the first droplet of liquid appears at a specific temperature.
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