Abstract
Background:The Inflow Performance Relationship (IPR) describes the behavior of flow rate with flowing pressure, which is an important tool in understanding the well productivity. Different correlations to model this behavior can be classified into empirically-derived and analytically-derived correlations. The empirically-derived are those derived from field or simulation data. The analytically-derived are those derived from basic principle of mass balance that describes multiphase flow within the reservoir. The empirical correlations suffer from the limited ranges of data used in its generation and they are not function of reservoir rock and fluid data that vary per each reservoir. The analytical correlations suffer from the difficulty of obtaining their input data for its application.Objectives:In this work, the effects of wide range of rock and fluid properties on IPR for solution gas-drive reservoirs were studied using 3D radial single well simulation models to generate a general IPR correlation that functions of the highly sensitive rock and fluid data.Methodology:More than 500 combinations of rock and fluid properties were used to generate different IPRs. Non-linear regression was used to get one distinct parameter representing each IPR. Then a non-parametric regression was used to generate the general IPR correlation. The generated IPR correlation was tested on nine synthetic and three field cases.Results & Conclusion:The results showed the high application range of the proposed correlation compared to others that failed to predict the IPR. Moreover, the proposed correlation has an advantage that it is explicitly function of rock and fluid properties that vary per each reservoir.
Highlights
Predicting the relationship between the flow rate and the pressure drop performance in the reservoir is very important for continuous production optimization
Results & Conclusion: The results showed the high application range of the proposed correlation compared to others that failed to predict the Inflow Performance Relationship (IPR)
Most of the IPR correlations suffer from common limitations that they are not explicitly function of the different reservoir rock and fluid properties that vary from one reservoir to another or its difficulty to be applied
Summary
Predicting the relationship between the flow rate and the pressure drop performance in the reservoir is very important for continuous production optimization. It was assumed that an oil production rate is directly proportional to draw down Using this assumption, well’s behavior can be described by productivity index; PI. Well’s behavior can be described by productivity index; PI This PI relationship was developed from Darcy’s law for steady state radial flow of a single incompressible fluid. The first presentation of an inflow performance relationship (IPR) was made by Rawlins and Schellhardt [2]. The Inflow Performance Relationship (IPR) describes the behavior of flow rate with flowing pressure, which is an important tool in understanding the well productivity. The analytical correlations suffer from the difficulty of obtaining their input data for its application
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