Abstract
Inflow performance relationship (IPR) is one of the most important methods for the analysis of the dynamic characteristics of gas reservoir production. The objective of this study was to develop a model to improve the accuracy of the IPR for evaluating and predicting the production of gas reservoirs. In this paper, a novel mathematical model, taking into account the real gas PVT behavior, is developed to accurately estimate the inflow performance relationship. By introducing a pseudo-pressure function and a real gas properties database, this model eliminates the error caused by the linearization method and improves the calculation accuracy. The results show that more than 90% of the energy in the flow field is consumed by inertial forces, which leads to significant high-velocity non-Darcy effects in the gas reservoir. The reservoir permeability, original reservoir pressure, stress sensitivity coefficient, and skin factor have a great impact on the inflow performance relationship of gas reservoir production. This model predicts gas IPR curves with excellent accuracy and high efficiency. The high-precision gas well inflow performance relationship lays a solid foundation for dynamic production analysis, rational proration, and intelligent development of the gas field.
Highlights
Gas well productivity plays a critical role in gas reservoir engineering
The fluid flow rate is usually assumed to be proportional to the difference between reservoir pressure and well bottom hole pressure [9], and this assumption leads to a linear relationship for the steady-state flow of incompressible single-phase fluid
The pseudo-pressure function and gas properties database are introduced to improve the accuracy of this model which estimates the inflow performance relationship of gas well production
Summary
The inflow performance relationship (IPR) of a well is the relationship between its production rate and the flowing bottom hole pressure. The fluid flow rate is usually assumed to be proportional to the difference between reservoir pressure and well bottom hole pressure [9], and this assumption leads to a linear relationship for the steady-state flow of incompressible single-phase fluid. Many scholars have studied many factors to improve the IPR accuracy of oil wells. Gas density varies with pressure, while crude oil density is usually treated as a constant. These significant differences have caused some simplifications for oil flow to be ineffective in gas flow
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