A Mechanistic Model for Computing Fluid Temperature Profiles in Gas-Lift Wells

1996 ◽  
Vol 11 (03) ◽  
pp. 179-185 ◽  
Author(s):  
A.R. Hasan ◽  
C.S. Kabir
Keyword(s):  
Mechanistic Model ◽  
Temperature Profiles ◽  
Fluid Temperature ◽  
Gas Lift

Predicting Temperatures in Flowing Oil Wells

1980 ◽  
Vol 102 (1) ◽  
pp. 2-11 ◽  
Author(s):  
K. C. Shiu ◽  
H. D. Beggs
Keyword(s):  
Field Data ◽  
Empirical Method ◽  
Oil Wells ◽  
Phase Flow ◽  
Temperature Profiles ◽  
Fluid Temperature ◽  
Two Phase ◽  
Design Problems ◽  
Gas Lift ◽  
Subsurface Temperatures

An empirical method is presented for calculating temperature profiles in flowing oil wells. The method is applicable to wells in which two-phase flow is occurring and in which the inlet fluid temperature is known. It was developed from field data and can be used in design problems which require accurate subsurface temperatures, such as flowing pressure traverse calculation and gas-lift design.

scholarly journals Modified methodology for determining the temperature profiles of inverted u-tubes steam generators used in pwr power plants

2021 ◽  
Vol 9 (2B) ◽  
Author(s):  
Marcos Filardy Curi
Keyword(s):  
Heat Exchanger ◽  
Phase Change ◽  
Power Plants ◽  
Flow Direction ◽  
Saturated Steam ◽  
Geometrical Parameters ◽  
Temperature Profiles ◽  
Fluid Temperature ◽  
Secondary Circuit ◽  
Steam Generators

The most common and reliable methodology for determining temperature profiles of Inverted U-tubes Steam Generators is using Computational Fluid Dynamics (CFD) programs. In this work, we developed a modified methodology, using the Wolfram Mathematica software, in order to determine, with good approximation, the temperature profiles of these kind of equipment. The first step was to determine expressions for the physical properties of the water in the operational conditions, like density, thermal conductivity, specific heat and dynamic viscosity. Geometrical parameters like tubes diameter and sub-channel flowing area, as well as the flow parameters like flow mass of primary and secondary fluid, were also considered for determining the numbers of Reynolds, Prandtl, Nusselt and, consequently, the variation of convective coefficients and the global heat transfer coefficient. With subroutines that use the method of the lines we were able to solve the partial differential equations applied to parallel and countercurrent heat exchangers with no phase change. The U-tubes SG were divided in two regions which the first one was calculated considering a parallel heat exchanger and the second one was calculated considering a countercurrent heat exchanger, depending on the flow direction of the primary and secondary circuit. During the phase change, a constant variation of the enthalpy was considered, making the primary fluid temperature decrease following a linear behavior. Using the developed methodology called “Enthalpy Ruler”, the encountered results were considered adequate, since the defined lengths are compatible with the constant variation of the enthalpy from the compressed liquid to saturated steam.

scholarly journals A new experimental method to prevent paraffin - wax formation on the crude oil wells: A field case study in Libya

2015 ◽  
Vol 69 (3) ◽  
pp. 269-274 ◽  
Author(s):  
Elnori Elhaddad ◽  
Alireza Bahadori ◽  
Manar Abdel-Raouf ◽  
Salaheldin Elkatatny
Keyword(s):  
Pour Point ◽  
Oil Wells ◽  
Fluid Temperature ◽  
Gas Field ◽  
Ethylene Copolymers ◽  
Comb Polymers ◽  
Point Temperature ◽  
Temperature Range ◽  
Gas Lift

Wax formation and deposition is one of the most common problems in oil producing wells. This problem occurs as a result of the reduction of the produced fluid temperature below the wax appearance temperature (range between 46?C and 50?C) and the pour point temperature (range between 42?C and 44?C). In this study, two new methods for preventing wax formation were implemented on three oil wells in Libya, where the surface temperature is, normally, 29?C. In the first method, the gas was injected at a pressure of 83.3 bar and a temperature of 65?C (greater than the pour point temperature) during the gas-lift operation. In the second method, wax inhibitors (Trichloroethylene-xylene (TEX), Ethylene copolymers, and Comb polymers) were injected down the casings together with the gas. Field observations confirmed that by applying these techniques, the production string was kept clean and no wax was formed. The obtained results show that the wax formation could be prevented by both methods.

scholarly journals A Comparison of Thermal Models for Temperature Profiles in Gas-Lift Wells

Energies ◽  
2018 ◽  
Vol 11 (3) ◽  
pp. 489 ◽  
Author(s):  
Langfeng Mu ◽  
Qiushi Zhang ◽  
Qi Li ◽  
Fanhua Zeng
Keyword(s):  
Temperature Profiles ◽  
Thermal Models ◽  
Gas Lift

Aerodynamics and Heat Transfer for a Cooled One and One-Half Stage High-Pressure Turbine—Part I: Vane Inlet Temperature Profile Generation and Migration

2011 ◽  
Vol 134 (1) ◽  
Author(s):  
R. M. Mathison ◽  
C. W. Haldeman ◽  
M. G. Dunn
Keyword(s):  
Heat Transfer ◽  
High Pressure ◽  
Temperature Profile ◽  
Film Cooling ◽  
Leading Edge ◽  
Inlet Temperature ◽  
Temperature Profiles ◽  
Fluid Temperature ◽  
High Pressure Turbine ◽  
Wide Range

As controlled laboratory experiments using full-stage turbines are expanded to replicate more of the complicated flow features associated with real engines, it is important to understand the influence of the vane inlet temperature profile on the high-pressure vane and blade heat transfer as well as its interaction with film cooling. The temperature distribution of the incoming fluid governs not only the input conditions to the boundary layer but also the overall fluid migration. Both of these mechanisms have a strong influence on surface heat flux and therefore component life predictions. To better understand the role of the inlet temperature profile, an electrically heated combustor emulator capable of generating uniform, radial, or hot streak temperature profiles at the high-pressure turbine vane inlet has been designed, constructed, and operated over a wide range of conditions. The device is shown to introduce a negligible pressure distortion while generating the inlet temperature conditions for a stage-and-a-half turbine operating at design-corrected conditions. For the measurements described here, the vane is fully cooled and the rotor purge flow is active, but the blades are uncooled. Detailed temperature measurements are obtained at rake locations upstream and downstream of the turbine stage as well as at the leading edge and platform of the blade in order to characterize the inlet temperature profile and its migration. The use of miniature butt-welded thermocouples at the leading edge and on the platform (protruding into the flow) on a rotating blade is a novel method of mapping a temperature profile. These measurements show that the reduction in fluid temperature due to cooling is similar in magnitude for both uniform and radial vane inlet temperature profiles.

Heat Transfer in Double U-Tube Boreholes With Two Independent Circuits

2011 ◽  
Vol 133 (8) ◽  
Author(s):  
Parham Eslami-nejad ◽  
Michel Bernier
Keyword(s):  
Heat Transfer ◽  
Operating Conditions ◽  
The Other ◽  
Heat Extraction ◽  
Temperature Profiles ◽  
Fluid Temperature ◽  
Temperature Heat ◽  
Axial Variation ◽  
Steady State Heat ◽  
Steady State Heat Transfer

This study presents the development of an analytical model to predict steady-state heat transfer in double U-tube geothermal boreholes equipped with two independent circuits. Such boreholes can be used for heat extraction in one circuit, combined with a heat pump, for example, and simultaneous thermal recharging in the other circuit. The model accounts for a thermal interaction among pipes, and it predicts the fluid temperature profiles in both circuits along the borehole depth, including the exit fluid temperature. Different circuit configurations are assessed under typical borehole operating conditions. For a typical borehole geometry, results show that double U-tube boreholes with two independent circuits connected to a relatively low temperature heat source are superior to single U-tube and regular (one circuit) double U-tube boreholes. The axial variation in fluid temperature and the heat exchange among pipes show that most of the heat transfer occurs in the downward legs. Furthermore, in some cases, the fluid in the heat extraction leg gets cooled as it flows upward, which is contrary to the desired effect.

A Mechanistic Model of a Nitrogen-Charged, Pressure-Operated Gas Lift Valve

1992 ◽  
Author(s):  
R.K. Sagar ◽  
Zelimir Schmidt ◽  
D.R. Doty ◽  
K.C. Weston
Keyword(s):  
Mechanistic Model ◽  
Gas Lift
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