Abstract
Inflow performance relationship (IPR) accuracy in the condensate reservoir is a long-standing problem in the oil industry. This paper presents a new approach to project the gas phase IPR in condensate reservoirs. IPR is estimated by Rawlins and Schellhardt equation whereas the gas pseudo-pressure function is solved by two methods and the results are compared. Both two pseudo-pressure equations are used to estimate IPR. Additionally, an average of both IPR’s is estimated and compared. At the reservoir pressure, the difference between both flow rates is negligible i.e. at 6750 psi, the flow rate difference is 0.55 MMSCF/D. As pressure declines the difference is increasing at one stage, it is observed approximately 15 MMSCF/D.
Highlights
The gas condensate reservoirs are difficult to predict due to its multiphase behavior
There is not much research conducted in the case of calculating gas phase Inflow Performance Relation (IPR) in a condensate reservoir
In the solution gas drive reservoir, two phase flow causes the curvature in IPR due to the reduction in the relative permeability of the oil phase with the depletion [2]
Summary
The gas condensate reservoirs are difficult to predict due to its multiphase behavior. There is not much research conducted in the case of calculating gas phase IPR in a condensate reservoir. It is possible to calculate IPR by using gas phase pseudo-pressure function without using the relative permeability data. Pseudo-pressure equation is solved using effective permeability data which can be obtained by pressure buildup test [1]. In the solution gas drive reservoir, two phase flow causes the curvature in IPR due to the reduction in the relative permeability of the oil phase with the depletion [2]. The major cause of production loss is condensate blockage near the wellbore [6]. This paper provides key improvements in the calculation of gas phase pseudo-pressure function using the integral effective permeability technique proposed in [12]
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