FLUID PROPERTY VARIATION ANALYSIS IN A HEAT EXCHANGER USING SUPERCRITICAL FLUIDS

2020 ◽  
Author(s):  
K H Jyothiprakash ◽  
Agniv Saha ◽  
Arihant Kumar Patawari ◽  
K. N. Seetharamu
Keyword(s):  
Heat Exchanger ◽  
Supercritical Fluids ◽  
Variation Analysis ◽  
Property Variation ◽  
Fluid Property

Accounting for Fluid-Property Variations in Temperature-Transient Analysis

SPE Journal ◽  
2017 ◽  
Vol 23 (03) ◽  
pp. 868-884 ◽  
Author(s):  
Yilin Mao ◽  
Mehdi Zeidouni
Keyword(s):  
Analytical Solutions ◽  
Transient Analysis ◽  
Correction Method ◽  
Transient Temperature ◽  
Property A ◽  
Property Variation ◽  
Fluid Property ◽  
Temperature Transient ◽  
Fluid Properties ◽  
Temperature Transient Analysis

Summary Significant fluid-property variation can be induced with pressure and temperature dynamics in the reservoir associated with oil production. The existing analytical solutions for temperature-transient analysis (TTA) generally assume constant fluid properties, which can be invalid especially for cases of high drawdown and strong temperature signals. In this study, we present a method to account for the fluid-property variations in TTA. The method introduces corrections on fluid-property values as input for analytical solutions, considering the quasilinear behavior of the temporal Joule-Thomson effect on a semilog plot. The corrections are performed on four identified fluid properties in an iterative manner, which can be easily implemented in available temperature-analysis procedures. To validate the developed approach, we model drawdown- and buildup-transient-temperature signals with the fluid-property correction method for nondamaged and damaged reservoirs under different production rates and reservoir-fluid compositions. The analytical modeling results are compared with numerical simulations. In addition, by finding the dominating fluid property, a simplified approach of property correction is presented. Through application to example problems, we show that using the fluid-property correction method presented here can improve the permeability estimations by 60% for the conditions considered in this paper. We present a modified method for damaged reservoirs, which results in an additional 25% improvement on the permeability estimations. With these improvements, the applicability of TTA using analytical solutions can be extended from cases with limited sandface-temperature signals of a few degrees Celsius to stronger signals of 20 to 30°C.

The impact of pressure and fluid property variation on well performance of liquid-rich Eagle Ford shale

2016 ◽  
Vol 33 ◽  
pp. 1056-1068 ◽  
Author(s):  
S. Amin Gherabati ◽  
John Browning ◽  
Frank Male ◽  
Svetlana A. Ikonnikova ◽  
Guinevere McDaid
Keyword(s):  
Well Performance ◽  
Eagle Ford Shale ◽  
Eagle Ford ◽  
Property Variation ◽  
Fluid Property ◽  
The Impact

Simultaneous Hydrodynamic and Thermal Development in Mixed Convection in a Vertical Annulus With Fluid Property Variations

1991 ◽  
Vol 113 (4) ◽  
pp. 926-931 ◽  
Author(s):  
W. Aung ◽  
H. E. Moghadam ◽  
F. K. Tsou
Keyword(s):  
Heat Transfer ◽  
Mixed Convection ◽  
Convection Heat Transfer ◽  
Outer Wall ◽  
Ideal Gas ◽  
Bulk Temperature ◽  
Axial Distribution ◽  
Property Variation ◽  
Fluid Property ◽  
Nusselt Numbers

This paper concerns a theoretical investigation of forced and mixed convection heat transfer in a vertical concentric annulus. An implicit finite difference technique is developed to study the effects of temperature-dependent fluid properties, which are represented by power law relations. The fluid under consideration in this study is air, which is an ideal gas with Pr = 0.72. Computations are made with a radius ratio of 0.25. The inner wall is heated at UHF, and the outer wall is heated at UHF or is insulated. The axial distribution of the wall-to-bulk temperature ratio is found to undergo a maximum or minimum, depending on whether the wall is heated or insulated. Fluid property variations enhance the local Nusselt numbers. It is shown that, depending on the length of the duct, heat transfer can be appreciably affected by fluid property variation. For the UHF cases studied here, free convection effects enhance the local Nusselt numbers at intermediate axial distances.

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