Pete 358 01 Introduction(1)
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Transcript of Pete 358 01 Introduction(1)
PETE-358: WELL PERFORMANCE
COURSE OUTLINE
1. Introduction
Well Test Objectives
Well Test Types
Inflow Performance Relationship
2. Fundamental Concepts in Well Testing
Flow Regimes: Steady, Pseudo-Steady and
Transient
Skin Effects
Wellbore Storage
Radius of Investigation
Principle of Superposition
3. Analysis of Pressure Drawdown Tests
Infinite-Acting Radial Flow Analysis
Constant Rate Drawdown
Variable Rate Drawdown
Estimating Reservoir Volume
4. Analysis of Pressure Buildup Tests
Analysis and Interpretation
Average Reservoir pressure
Detection of Fault Boundaries
PETE-358: WELL PERFORMANCE
COURSE OUTLINE
5. Computer-Aided Analysis and Interpretation
Pressure Derivative Plot – Diagnostics
Flow Regime Identification
Well, Reservoir and Boundary Models
Pressure Derivative Analysis
Automatic Parameter Estimation
6. Gas Well Testing
Pseudopressure and Pseudotime
Non-Darcy Flow/Rate Dependent Skin
Gas Well Deliverability
Gas Rate Forecasting
7. Well Test Design
Design Considerations
Design Equations
8. Introduction to Horizontal Well Test Analysis
Flow Regime Identification
Analysis of Test Data
Well Performance
• Also known as: Well Testing
Pressure Transient Testing
Reservoir Testing
• Well testing generally refers to generating and measuring pressure variations with time in wells, and using this information to estimate rock, fluid and well properties
• Powerful reservoir description tool. Essential for analysis and improvement of reservoir performance
Classification
• Productivity well testing
• Descriptive well testing
Types of Tests
• Drawdown
• Buildup
• Injectivity
• Falloff
• Interference
• Deliverability
Productivity Testing
Inflow Performance
• Inflow from Reservoir to Well
• Performance depends on
reservoir and fluid properties:
– Reservoir pressure
– Permeability
– Viscosity
– Bottom hole pressure
• The well can deliver only what
the reservoir provides
Inflow Performance
• Inflow performance is usually
expressed in terms of flow rate
versus drawdown pressure or rate
versus bottom-hole pressure
• For single-phase liquids, flow rate
is proportional to drawdown
pressure.
• For gases and gas-liquid systems,
flow rate is not necessarily
proportional to drawdown
Inflow Performance
Inflow Performance
(Liquid)
• q = PI (Pres – Pw)
• PI is the Productivity Index,
which depends on
– Reservoir permeability
– Net thickness
– Drainage area
– Fluid properties
– Well damage or stimulation
A = Oil well: Low productivity
B = Oil well: High productivity
C = Gas well: general