Abstract
The mathematical model of composite reservoir has been widely used in well test analysis. In the process of oil recovery, due to the injection or replacement of the displacement agent, the model boundary can be moved. At present, the mathematical model of a composite reservoir with a moving boundary is less frequently studied and cannot meet industrial demand. In this paper, a mathematical model of a composite reservoir with a moving boundary is developed, with consideration of wellbore storage and skin effects. The characteristics of pressure transient in moving boundary composite reservoir are studied, and the influences of parameters, such as initial boundary radius, moving boundary velocity, skin factor, wellbore storage coefficient, diffusion coefficient ratio, and mobility ratio on pressure and production, are analyzed. The moving boundary effects are noticeable mainly in the middle and late production stages. The proposed model provides a novel theoretical basis for well test analysis in these types of reservoirs.
Highlights
A composite reservoir model is widely used to model reservoirs with distinct regional properties variations
The composite reservoir model has been widely investigated in literature [1,2,3,4,5,6,7,8,9,10,11]
The purpose of this paper is to study the pressure and production characteristics of composite reservoir with moving boundary
Summary
A composite reservoir model is widely used to model reservoirs with distinct regional properties variations. Among others, these variations may be caused by changes in formation physical properties, foreign fluids intrusion, and changes in formation fluid characteristics. These variations may be caused by changes in formation physical properties, foreign fluids intrusion, and changes in formation fluid characteristics These two different areas are separated by a discontinuous interface. Actual production cases often need to be modeled as a composite reservoir, such as in the cases of reservoir flooding (water, gas, chemical, steam) and formation stimulation. If the formation is stimulated or damaged, it can be considered a composite reservoir. There is very little research on composite reservoirs with a moving boundary
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