Category: Gas-Condensate Reservoirs

One of the major disadvantages associated with the use of lean gas in gas-cycling applications is that the income that would be derived from the sale of the lean gas is deferred for several years. For this reason, the use of nitrogen has been suggested as a replacement for the lean gas.16 However, one might expect… Continue reading Use of Nitrogen for Pressure Maintenance

Because the liquid content of many condensate reservoirs is a valuable and important part of the accumulation and because through retrograde condensation a large fraction of this liquid may be left in the reservoir at abandonment, the practice of lean gas cycling has been adopted in many condensate reservoirs. In gas cycling, the condensate liquid… Continue reading Lean Gas Cycling and Water Drive

Allen and Roe have reported the performance of a retrograde condensate reservoir that produces from the Bacon Lime Zone of a field located in East Texas.13 The production history of this reservoir is shown in Figs. 5.6 and 5.7. The reservoir occurs in the lower Glen Rose Formation of Cretaceous age at a depth of 7600 ft (7200 ft… Continue reading Comparison between the Predicted and Actual Production Histories of Volumetric Reservoirs

The laboratory test on the retrograde condensate fluid in Example 5.3 is itself a material balance study of the volumetric performance of the reservoir from which the sample was taken. The application of the basic data and the calculated data of Example 5.3 to a volumetric reservoir is straightforward. For example, suppose the reservoir had produced 12.05 MMM SCF of gross… Continue reading Use of Material Balance

The behavior of single-phase gas reservoirs is treated. Since no liquid phase develops within the reservoir, where the temperature is above the cricondentherm, the calculations are simplified. When the reservoir temperature is below the cricondentherm, however, a liquid phase develops within the reservoir when pressure declines below the dew point, owing to retrograde condensation, and… Continue reading The Performance of Volumetric Reservoirs

The initial gas and oil (condensate) for gas-condensate reservoirs, both retrograde and nonretrograde, may be calculated from generally available field data by recombining the produced gas and oil in the correct ratio to find the average specific gravity (air = 1.00) of the total well fluid, which is presumably being produced initially from a one-phase… Continue reading Calculating Initial Gas and Oil

Gas-condensate production may be thought of as intermediate between oil and gas. Oil reservoirs have a dissolved gas content in the range of zero (dead oil) to a few thousand cubic feet per barrel, whereas in gas reservoirs, 1 bbl of liquid (condensate) is vaporized in 100,000 SCF of gas or more, from which a… Continue reading Introduction