This paper presents a brief bibliographic summary of the related well heat transfer models, most of them are designed for predicting heat loss along wells. All of those models lead to temperature profiles which show a lowering on fluid temperature during the injection from the wellhead to the wellbore, that make those models fit perfectly into the heat loss statement.
The purpose of this article is to show a way to calculate the temperature increase of a fluid injected at surface temperature along a well by modifying an existing equation which was proposed by Boyun Guo (2004), this one satisfies the non-phase change of the injected fluid during its flow through the well, this implies that the selected model does not take into account latent heat change of the injected fluid, the previous fact is very important for this study because it is supposed that the injected fluid is not going to change its phase.
Modifying Boyun Guo (2004) energy balance equation allowed to establish a profile temperature of a fluid injected at surface temperature into either a vertical or deviated well. It is also included a brief analysis of each of the parameters engaged on the process in order to determine the effect of those properties upon the injected fluid temperature.
Table of Contents
1. WELL HEAT TRANSFER MODELS
2. WELL HEAT TRANSFER MODEL
2.1 MODEL FOR PREDICTING HEAT LOSS ON HOT INJECTED FLUIDS
3. MODEL INTERPRETATION
4. MODEL MODIFICATION
5. MODEL RESPONSE
6. PARAMETER ANALYSIS ON THE MODEL
6.1 Injection Pipe Diameter
6.2 Flow Rate
6.3 Annular Fluid Thermal Conductivity
6.4 Well Deviation Angle
6.5 Inner Casing Diameter
7. CONCLUSIONS
8. NOMENCLATURE
9. REFERENCES
10. APPENDIX A
Research Objectives and Core Themes
The primary objective of this research is to develop a method for calculating the temperature profile of a fluid injected at surface temperature into vertical or deviated wells by modifying an existing energy balance equation proposed by Boyun Guo (2004), specifically for non-phase change scenarios.
- Mathematical modeling of heat transfer in wellbores.
- Modification of the Boyun Guo (2004) energy balance equation.
- Analysis of fluid injection temperature profiles in vertical and deviated wells.
- Sensitivity analysis of parameters such as pipe diameter, flow rate, and thermal conductivity.
- Comparative performance of water-based versus oil-based fluids in injection processes.
Excerpt from the Book
MODEL INTERPRETATION
The results produced by this model could be represented on a plot that correlates depth against temperature, as shown on the plot 1.
What is shown on the plot 1, is the injected fluid temperature loss, it is caused by the difference between the higher fluid temperature compared to rock temperature
Summary of Chapters
WELL HEAT TRANSFER MODELS: Provides a comprehensive literature review and compilation of existing well heat transfer models, including those by Alves, Belrute, Dawkrajai, and Ramey.
WELL HEAT TRANSFER MODEL: Presents the foundational energy balance equations proposed by Boyun Guo and outlines the methodology for calculating thermal energy loss.
MODEL FOR PREDICTING HEAT LOSS ON HOT INJECTED FLUIDS: Details the mathematical framework and specific equations used to determine heat accumulation and fluid temperature changes.
MODEL INTERPRETATION: Discusses the visual representation of results and the correlation between depth and temperature profiles.
MODEL MODIFICATION: Explains the specific mathematical adjustments made to the energy balance equation to account for surface-temperature injections.
MODEL RESPONSE: Demonstrates the model's application using water and oil-based fluids and compares the thermal behavior of each.
PARAMETER ANALYSIS ON THE MODEL: Investigates the individual impact of variables like pipe diameter, flow rate, and casing size on the final temperature profile.
CONCLUSIONS: Summarizes the effectiveness of the modified model in predicting temperature profiles for non-phase change fluids.
NOMENCLATURE: Lists all variables, parameters, and units used throughout the mathematical derivations.
REFERENCES: Provides the bibliographic citations used in the study.
APPENDIX A: Contains the step-by-step mathematical deduction of the energy balance equations.
Keywords
Fluid Temperature, Surface Conditions, Modification, Temperature Profile, Vertical Wells, Deviated Wells, Heat Transfer, Energy Balance, Injection Well, Thermal Conductivity, Flow Rate, Pipe Diameter, Wellbore, Numerical Modeling
Frequently Asked Questions
What is the primary focus of this research?
The work focuses on modeling the temperature behavior of fluids injected into vertical and deviated wells, specifically calculating temperature changes along the wellbore.
Which mathematical base model does this paper improve upon?
The research is based on a modification of the energy balance equation originally proposed by Boyun Guo in 2004.
What is the main goal or research question?
The goal is to establish an accurate temperature profile for fluids injected at surface temperature while ignoring phase changes of the fluid during the process.
What scientific method is utilized in this paper?
The paper utilizes mathematical modeling and the analytical derivation of energy balance equations to simulate heat transfer phenomena in wellbores.
What topics are covered in the main section?
The main sections cover model selection, modification of energy balance equations, interpretation of temperature-depth plots, and sensitivity analyses of injection parameters.
Which keywords best describe this study?
Key terms include Fluid Temperature, Thermal Conductivity, Heat Transfer, Wellbore Modeling, and Injection Well Analysis.
How does increasing the injection pipe diameter affect the fluid temperature?
Increasing the diameter magnifies the transversal area, which reduces fluid velocity, increases residence time, and results in higher thermal energy transfer.
Why does the model assume no phase change for the injected fluid?
The model assumes no phase change to simplify the energy balance equation, as the study focuses on fluids that remain in a single phase during the injection process.
What is the effect of well deviation on the temperature profile?
The study concludes that increasing the well deviation angle leads to a reduction in the injected fluid temperature due to changes in the geothermal gradient relative to the well path.
What is the difference between the behaviors of water-based and oil-based fluids in this model?
The model demonstrates that oil-based fluids exhibit higher temperatures along the well compared to water-based fluids, primarily due to differences in fluid density and heat capacity.
- Arbeit zitieren
- Jesus Rodriguez (Autor:in), 2015, Fluid temperature modelling injected at surface temperature through vertical wells, München, GRIN Verlag, https://www.grin.com/document/305676
