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Advanced Reservoir Engineering
Overview
Prepared by: Dr. B. Rostami
September 2010
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Contents Fundamental of Fluid Flow in Petroleum Reservoirs Transient Well Pressure Analysis Conventional Gas Reservoirs Analysis
Evaluation of Oil Reservoir Performance Evaluation of Water Influx Performance Useful Topics (Oil & gas reserves, EOR and IOR, Management, Simulation) Institute of Petroleum Engineering
References
Institute of Petroleum Engineering
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Advanced Reservoir Engineering, Tarek Ahmed & Paul McKinney.
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Fundamentals of Reservoir Engineering, L. P. Dake.
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Applied Petroleum Reservoir Engineering, B. C. Craft & M. F. Hawkins.
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Practical Enhanced Reservoir Engineering, Abdus Satter, Ghulam M. lqbal, James K. Buchwalter.
• Chapter #1 Fundamental of Fluid Flow in Petroleum Reservoirs • Contents Types of fluids in the reservoir;
Primary reservoir Characteristics Flow regimes; Reservoir geometry;
Fluid Flow Equations
Number of flowing fluids in the reservoir.
(1) steady-state flow;
● linear flow of incompressible fluids;
(2) unsteady-state flow;
● linear flow of slightly compressible fluids;
(3) pseudosteady-state flow.
● linear flow of compressible fluids; ● radial flow of incompressible fluids;
Institute of Petroleum Engineering
Darcy's law and applications Fluid potential definition
● radial flow of slightly compressible fluids; ● radial flow of compressible fluids; ● multiphase flow.
Chapter #2 Transient Well Pressure Analysis
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Contents Fundamental of well test theory Overview of well test methodology Important concepts in well test analysis Interpretation of transient pressure tests Reservoir model diagnostic
• Chapter #3 Conventional Gas Reservoirs Analysis
• Contents Gas flow under laminar flow condition
Vertical Gas Well Performance Horizontal Gas Well Performance
Gas flow under turbulent flow condition Back pressure test IPR curve
Material Balance Equation for Conventional and Unconventional Gas Reservoirs Volumetric method
Material balance method Institute of Petroleum Engineering
Volumetric gas reservoirs Water derive gas reservoirs
Chapter #4 Evaluation of Oil Reservoir Performance Contents
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Primary Recovery Mechanisms Volumetric and empirical method for reservoir analysis Decline curve analysis and applications The generalized Material Balance Equation The Material Balance as an Equation of a Straight Line Reservoirs performance prediction methods
Chapter #5 Evaluation of Water Influx Performance Contents Classification of Aquifers Recognition of Natural Water Influx Water Influx Models
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Useful Topics Oil & Gas Reserves,
Institute of Petroleum Engineering
Useful Topics Oil & Gas Reserves,
Institute of Petroleum Engineering
Useful Topics Oil & Gas Reserves,
Institute of Petroleum Engineering
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Useful Topics Oil Reserves, Oil & gas journal 2006
Institute of Petroleum Engineering
Useful Topics Gas Reserves, Oil & gas journal 2006
World Resources of Petroleum
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Useful Topics
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Unproved Reserves Possible Reserves
Possible Reserves
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Analogy-Based Approach Volumetric Estimates Deterministic Methods Stochastic Methods
Performance Analysis Material Balance Equation Reservoir Simulation Models Decline Curve Analysis
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Analogy-Based Approach Estimate the reserves in a situation where there are no solid data on well performance or reservoir characteristics. However, an analogue-based approach is also the least accurate and little reliable method of petroleum reserve estimation,
Volumetric Estimates Deterministic Methods: The principle is to "upscale" the information derived from the wells and supported by seismic survey, into the interwell space by using an interpolation technique.
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Volumetric Estimates (Deterministic Method) The main parameters used for a volumetric estimate: The reservoir "gross" isopach map, The reservoir "net" isopach map, The Net-to-Gross ratio (N/G) is an important parameter indicating the productive portion of the reservoir.
The reservoir rock porosity The permeability and net-thickness product (khN) Volume-based average saturation of water, gas and oil.
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Volumetric Estimates (Stochastic Method) is usually based on the procedure of random-number generator Assumes that the main reservoir properties all have random, possibly normal, frequency distributions, range from core to well-log data.
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Volumetric Estimates (Stochastic Method)
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Performance Analysis Material Balance Equation is based on the data obtained from previous reservoir performance and PVT analysis, but involves some assumptions for the reservoir driving mechanism.
Reservoir Simulation Models involves a numerical simulation technique, with the matching of the production and the reservoir’s previous performance (history).
Decline Curve Analysis is to predict future performance of the reservoir by matching the observed trend of the production decline with one or several standard mathematical methods of the production rate-time (hyperbolic, harmonic, exponential, ect.).
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Decline Curve Analysis
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Different ways of data representation for a decline curve analysis