I DEVELOPMENT OF AN EXPERT SYSTEM FOR RESERVOIR FLUID PVT PROPERTIES CORRELEATIONS Presented By Ahmed Moustafa Abd El-Rahman Al-Zahaby B.Sc. in Petroleum Eng. Al-Azhar University (2007) A Thesis Submitted to the Department of Mining, Petroleum, and Metallurgical Engineering Faculty of Engineering, Cairo University In Partial Fulfillment of the Requirements for the Degree of MASTER OF SCIENCE IN PETROLEUM ENGINEERING FACULTY OF ENGINEERING, CAIRO UNIVERSITY GIZA, EGYPT 2012
20
Embed
DEVELOPMENT OF AN EXPERT SYSTEM FOR · PDF fileRESERVOIR FLUID PVT PROPERTIES CORRELEATIONS ... Under-saturated Isothermal Oil Compressibility ... Compressibility Factor of Gas
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
I
DEVELOPMENT OF AN EXPERT SYSTEM FOR
RESERVOIR FLUID PVT PROPERTIES
CORRELEATIONS
Presented By
Ahmed Moustafa Abd El-Rahman Al-Zahaby
B.Sc. in Petroleum Eng. Al-Azhar University (2007)
A Thesis Submitted to the Department of Mining, Petroleum, and
Metallurgical Engineering
Faculty of Engineering, Cairo University
In Partial Fulfillment of the Requirements for the Degree of
MASTER OF SCIENCE
IN
PETROLEUM ENGINEERING
FACULTY OF ENGINEERING, CAIRO UNIVERSITY
GIZA, EGYPT
2012
II
DEVELOPMENT OF AN EXPERT SYSTEM FOR
RESERVOIR FLUID PVT PROPERTIES
CORRELEATIONS
Presented By
Ahmed Moustafa Abd El-Rahman Al-Zahaby
B.Sc. in Petroleum Eng. Al-Azhar University (2007)
A Thesis Submitted to the Department of Mining, petroleum, and
Metallurgical Engineering
Faculty of Engineering, Cairo University
In Partial Fulfillment of the Requirements for the Degree of
MASTER OF SCIENCE
IN
PETROLEUM ENGINEERING
Under the Supervision of
Prof. Dr. Mohamed Helmy Sayyouh
Professor of Petroleum Engineering
Cairo University
Prof. Ahmed El-Banbi
Professor of Petroleum Engineering
Cairo University
FACULTY OF ENGINEERING, CAIRO UNIVERSITY
GIZA, EGYPT
2012
III
DEVELOPMENT OF AN EXPERT SYSTEM FOR
RESERVOIR FLUID PVT PROPERTIES
CORRELEATIONS Presented By
Ahmed Moustafa Abd-El Rahman Al-Zahaby
B.Sc. in Petroleum Eng. Al-Azhar University (2007)
A Thesis Submitted to the Department of Mining, Petroleum, and
Metallurgical Engineering
Faculty of Engineering, Cairo University
In Partial Fulfillment of the Requirements for the Degree of
MASTER OF SCIENCE
IN
PETROLEUM ENGINEERING
Approved by the
Examining Committee
…………………………………………
Prof. Dr. Mohamed Helmy Sayyouh
Faculty of Engineering, Cairo University, Thesis Main Advisor
…………………………………………
Prof. Dr. Ahmed El-Banbi
Faculty of Engineering, Cairo University, Thesis Main Advisor
…………………………………………
Prof. Dr. M. Khairy
Faculty of Engineering, Cairo University, Member
…………………………………………
Prof. Dr. Ismail Mahgoub
Faculty of Engineering, Cairo University, Member
FACULTY OF ENGINEERING, CAIRO UNIVERSITY
GIZA, EGYPT
2012
IV
ABSTRACT
DEVELOPMENT OF AN EXPERT SYSTEM FOR
RESERVOIR FLUID PVT PROPERTIES
CORRELEATIONS
Accurate determination of the crude oil PVT properties is essential for solving many
reservoir engineering, production engineering, and surface production and operational
problems. A large number of PVT correlations for oil exist in the petroleum literature and
numerous studies are also present for with data favoring one correlation over the other. In
the absence of PVT data from laboratory experiments, it is often difficult to choose which
correlation to use to calculate different PVT properties. We approached this problem in
two ways. First, we developed an expert system that checks the input parameters (e.g.
reservoir parameters) against the valid ranges of input data for different correlations, and
then recommends which correlations to use for specific input parameters. Second, we
tested all available PVT correlations for black oil on a database of selected 35 Egyptian
crudes to develop guidelines on which correlations to use for each PVT property for the
specific range of input data. These specific crudes were selected to allow testing of those
guidelines on a wide range of reservoir input data for black oils. Our database included
oils with oAPI ranging from 17 to 51, gas-oil-ratios of 8 to 7,800 scf/STB, formation
volume factor at bubble point of 1.04 to 4.47 bbl/STB, bubble point pressures of 60 to
4739psia, and reservoir temperatures of 40 to 270 ◦F.
The present work included 14 bubble points, 6 solution-gas-oil ratio, 15 formation
10 under saturated oil viscosities ,12 under-saturated densities, 2 total formation volume
factors and 2 saturated density correlations. In addition to 6 dew point pressure
correlations and 8 gas compressibility factors.
V
Based on this study, guidelines for selecting an appropriate correlation for PVT
properties are introduced .These guidelines are recommended in programming of PVT
correlations regardless of their geographic origin.
VI
Dedication
To my dear mother, I am not able to thank you, because
whatever I did, you deserve more.
VII
ACKNOWLEDGEMENT
All praise to Allah, the Almighty, who gave me the confidence to carry out this work.
I wish to express my great gratitude to professor Dr. Mohamed Helmy Sayyouh and Prof.
Ahmed Hamdi El-Banbi, Mining Petroleum, and Metallurgical Department, Faculty of
Engineering, Cairo University for selecting the study subject, supervising the work, and
for valuable guidance during the preparation and for their continuous suggestions and
encouragement.
I am grateful to Dr Ismail Mahgoub who allowed me to use some industry resources and
useful materials.
Also my acknowledgments to all my friends and staff members who made my stay here
at Cairo and the British University in Egypt. Last but not the least; I am grateful to my
mother and my father for their understanding and affection throughout my life.
Acknowledgements are also extended to my professor Dr. Selim Zeidan of Faculty of
Engineering Al-Azhar University for his continuous support and careful review of the
manuscript.
VIII
CONTENTS Page
ABSTRACT ......................................................................................................................................................... IV
DEDICATION ..................................................................................................................................................... VI
ACKNOWLEDGEMENT .......................................................................................................................................... VII
CONTENTS .......................................................................................................................................................... VIII
LIST OF TABLES ..................................................................................................................................................... XI
LIST OF FIGURES .................................................................................................................................................. XIII
NOMENCLATURE .............................................................................................................................................. XIV
LITERATURE REVIEW .............................................................................................................................................. 4
OBJECTIVES AND STATEMENT OF THE PROBLEM ................................................................................................. 44
3.1 THE PROBLEM .................................................................................................................................................... 44 3.2 OBJECTIVES OF THE STUDY .................................................................................................................................... 44
RESULTS AND DISCUSSIONS ................................................................................................................................. 96
6.1 GUIDELINES FOR SELECTING THE APPROPRIATE PVT PROPERTIES BASED ON THE RESULTS OF RELIABILITY ANALYSIS PERFORMED
ON EGYPTIAN OIL SAMPLES ............................................................................................................................................ 96 6.1.1. COMPARISON OF BUBBLE POINT PRESSURE CORRELATIONS ..................................................................................... 96 6.1.2. COMPARISON OF SOLUTION GAS OIL RATIO CORRELATIONS. .................................................................................... 97 6.1.3. COMPARISON OF BUBBLE POINT OIL FORMATION VOLUME FACTOR CORRELATIONS. .................................................... 97 6.1.4. COMPARISON OF UNDER-SATURATED OIL FORMATION VOLUME FACTOR CORRELATIONS. ............................................. 97
X
6.1.5. COMPARISON OF UNDER-SATURATED OIL VISCOSITY CORRELATIONS. ........................................................................ 97 6.1.6. COMPARISON OF GAS SATURATED OIL VISCOSITY CORRELATIONS. ............................................................................ 98 6.1.7. COMPARISON OF THE COEFFICIENT OF UNDER-SATURATED ISOTHERMAL OIL COMPRESSIBILITY CORRELATIONS. ................. 98 6.1.8. COMPARISON OF GAS SATURATED OIL DENSITY CORRELATIONS. ............................................................................. 98 6.1.9. COMPARISON OF UNDER-SATURATED OIL DENSITY CORRELATIONS. .......................................................................... 99 6.2 GUIDELINES FOR SELECTING THE APPROPRIATE PVT PROPERTIES BASED ON RESULTS OF RELIABILITY ANALYSIS PERFORMED ON
WORLDWIDE GAS CONDENSATE SAMPLES .......................................................................................................................... 99 6.2.1. COMPARISON OF GAS COMPRESSIBILITY FACTOR CORRELATIONS. ............................................................................. 99 6.2.2. COMPARISON OF DEW POINT PRESSURE CORRELATIONS. ........................................................................................ 99
APPENDIX A ....................................................................................................................................................... 114
EMPIRICAL PVT CORRELATIONS USED FOR CORRELATIONS ............................................................................... 114
APPENDIX B ............................................................................................................................................................
ERROR CALCULATIONS DETAILS FOR OIL DATA BASE ......................................................................................... 169
XI
LIST OF TABLES
Table No. Page
Table 4- 1: Data Range for the Egyptian PVT Data ........................................................... 52
Table 4- 2: Reported Input Parameters Ranges for Bubble Point Pressure Correlations 53
Table 4- 3: Reported Input Parameters Ranges for Solution Gas Oil Ratio Correlations . 54