Pressure Transient Testing

John Lee, John B. Rollins & John P. Spivey

1. Fundamentals of Fluid Flow in Porous Media

1.1. Overview

1.2. Derivation of the Diffusivity Equation

1.3. Initial and Boundary Conditions

1.4. Dimensionless Groups

1.5. Solutions to the Diffusivity Equation

1.6. Superposition in Space

1.7. Superposition in Time

1.8. Deconvolution

1.9. Chapter Summary

1.10. Discussion Questions

2. Introduction to Flow and Buildup-Test Analysis: Slightly Compressible Fluids

2.1 Overview

2.2 Analysis of Flow Tests

2.3 Analysis of Pressure-Buildup Tests

2.4 Complications in Actual Tests

2.5 Analysis of Late-Time Data in Flow and Buildup Tests

2.6 Analyzing Well Tests With Multiphase Flow

2.7 Chapter Summary

3. Introduction to Flow and Buildup-Test Analysis: Slightly Compressible Fluids

3.1 Overview

3.2 Pseudopressure and Pseudotime Analysis

3.3 Pressure and Pressure-Squared Analysis

3.4 Non-Darcy Flow

3.5 Analysis of Gas-Well Flow Tests

3.6 Analysis of Gas-Well Buildup Tests

3.7 Chapter Summary

4. Well-Test Analysis by Use of Type Curves

4.1 Overview

4.2 Development of Type Curves

4.3 Application of Type Curves—Homogeneous Reservoir Model, Slightly Compressible

Liquid Solution

4.4 Application of Type Curves—Homogeneous Reservoir Model, Compressible

Fluids

4.5 Correcting Initial Pressure in a Well Test

4.6 Reservoir Identification With Type Curves

4.7 Systematic Analysis Procedures for Flow and Buildup Tests

4.8 Well-Test-Analysis Worksheets

4.9 Chapter Summary

5. Analysis of Pressure-Buildup Tests Distorted by Phase Redistribution

5.1 Overview

5.2 Description of Phase Redistribution

5.3 Phase-Redistribution Model

5.4 Analysis Procedure

5.5 Chapter Summary

6. Well-Test Interpretation in Hydraulically Fractured Wells

6.1 Overview

6.2 Flow Patterns in Hydraulically Fractured Wells

6.3 Flow Geometry and Depth of Investigation of a Vertically Fractured Well

6.4 Specialized Methods for Post-Fracture Well-Test Analysis

6.5 Post-Fracture Well-Test Analysis With Type Curves

6.6 Effects of Fracture and Formation Damage

6.7 Chapter Summary

7. Interpretation of Well-Test Data in Naturally Fractured Reservoirs

7.1 Overview

7.2 Naturally Fractured Reservoir Models

7.3 Pseudosteady-State Matrix Flow Model

7.4 Transient Matrix Flow Model

7.5 Chapter Summary

8. Drillstem Testing and Analysis

8.1 Overview

8.2 Conventional DST

8.3 Conventional DST Design

8.4 DST-Monitoring Procedures

8.5 DST Analysis Techniques

8.6 Closed-Chamber DST

8.7 Impulse Testing

8.8 Chapter Summary

9. Injection-Well Testing

9.1 Overview

9.2 Injectivity Testing in a Liquid-Filled Reservoir: Unit-Mobility-Ratio Reservoir Conditions

9.3 Falloff Testing in a Liquid-Filled Reservoir: Unit-Mobility-Ratio Reservoir Conditions

9.4 Estimating Average Drainage-Area Pressure

9.5 Composite-System-Test Analysis for Nonunit-Mobility-Ratio Reservoir Conditions

9.6 Step-Rate Testing

9.7 Chapter Summary

10. Interference and Pulse Testing

10.1 Overview

10.2 Interference Tests

10.3 Pulse Tests

10.4 Recommendations for Multiple-Well Testing

10.5 Chapter Summary

11. Design and Implementation of Well Tests

11.1 Overview

11.2 Types and Purposes of Well Tests

11.3 General Test-Design Considerations

11.4 Pressure Transient Test Design

11.5 Deliverability-Test Design

11.6 Chapter Summary

12. Horizontal Well Analysis

12.1 Overview

12.2 Steps in Evaluating Horizontal Well-Test Data

12.3 Horizontal Well Flow Regimes

12.4 Identifying Flow Regimes in Horizontal Wells

12.5 Summary of Analysis Procedures

12.6 Field Examples

12.7 Running Horizontal Well Tests

12.8 Estimating Horizontal Well Productivity

12.9 Comparison of Recent and Older Horizontal Well Models

12.10 Chapter Summary

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