Transient Well Testing

INSTRUCTOR: Medhat (Med) M. Kamal, PhD
DISCIPLINE: Engineering, Formation Evaluation
COURSE LENGTH (DAYS): 5 Days
CEUS: 4.0
AVAILABILITY: Public & In-House

 

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WHO SHOULD ATTEND: This workshop is especially targeted at the following professionals who have basic knowledge/experience of reservoir engineering & well testing in the oil and gas industry: Reservoir engineers, production engineers, petroleum engineers, geoscientists, subsurface managers, exploration & production managers.

COURSE DESCRIPTION: Led by an expert reservoir engineering consultant, this workshop will underline transient well test analysis techniques, emphasizing the practical application of pressure transient analysis for accurate and comprehensive characterization of well and reservoir properties.

The workshop will start off with a quick review of flow regimes and their deduced properties, modern well test analysis workflow, deconvolution, and methods to determine average reservoir pressure. The workshop will then focus on well test analyses for gas wells, naturally fractured reservoirs, hydraulically fractured wells, injection wells, and horizontal wells. In depth discussion on important topics for the above wells such as turbulant (non-Darcy) flow, pseudo-steady state & transient interporosity flow, finite & infinite conductivity fractures, step rate and falloff tests, and design of transient tests will be integrated in the workshop.

Saphir will be used to solve problems and discuss field cases in class. Our experienced course facilitator will also present a step-by-step guided sessions on the use of the software. Real-life case histories as well as practical exercises will be included throughout the workshop for maximum internalization of the course content.

PARTICIPANTS ARE REQUIRED TO BRING THEIR OWN LAPTOP FOR THIS COURSE

You are also encouraged to bring your own data sets to discuss with the course facilitator. Saphir will be used to solve problems and exercises.

LEARNING OUTCOMES:

  • Master interpretation methodology for well tests
  • Avoid potential pitfalls during analysis of well test data
  • Identify specialized analysis techniques for bilinear flow, linear flow, spherical flow radial flow, and boundary dominated flow periods.
  • Determine average pressure through the appropriate methods for your reservoir.
  • Interpret well test data for oil and gas wells, naturally fractured reservoirs, hydraulically fractured wells, production and injection wells, and horizontal wells
  • Consider the differences of gas well testing from oil or water well testing
  • Examine step rate tests for formation properties and parting pressure during injection well testing
  • Discover the method of designing transient well tests to achieve the testing objectives
  • Assess the current & future capabilities of numerical well testing

 

COURSE CONTENT:

Introduction

  • Well Test Analysis Basic Problem
  • What is Pressure Transient Testing?
  • Reasons for Conducting Pressure Transient Tests
  • Workshop Objectives

 

Review

  • Theoretical Background
  • Flow Regimes & Properties Deduced From Each One
    • Wellbore Storage and Skin
    • Linear Flow
    • Bilinear Flow
    • Spherical Flow
    • Radial Flow
    • Pseudo Steady State
    • Steady State
  • Deconvolution
  • Workflow of Modern Well Test Analysis
  • Working Example (Review of Software Capability & Use)
    • Step by Step Instructions for Analyzing Typical Buildup Tests
  • Inverse Problem & Practical Considerations
  • Case Histories
    • Reservoir Limit Test
    • Deepwater Oil Buildup Test

 

Average Reservoir Pressure

  • Determination of Average Reservoir Pressure
  • Mathews, Brons, & Hazebroek Method
  • Horner Method
  • Miller, Dyes, & Hutchinson Method
  • Muskat Method
  • Arps & Smith Method
  • Practical Considerations (When and How to Use Different Methods)

 

Gas Well Testing

  • Difference from Oil or Water Well Testing
  • Pseudo-Pressure
  • Pseudo-Time
  • Turbulance (Flow Rate Dependant Skin)
  • Non-Darcy Flow
  • Deliverability and Absolute Open Flow
  • Case Histories
    • Multirate Flow Tests
    • Deliverability Testing

 

Naturally Fractured Reservoirs

  • Introduction
  • Definitions of New Parameters
  • Pseudo-Steady State Interporosity Flow
  • Transient Interporosity Flow
  • Practical Considerations
  • Case Histories
    • Oil Carbonate Buildup Test

 

Hydraulically Fractured Wells

  • Introduction
  • Flow Characteristics of a Vertically Fractured Well
  • Linear Flow Solution
  • Graphical Characteristics of a Fractured Well
  • Infinite Conductivity Vertical Fracture
  • Finite Conductivity Model
  • Specialized Analysis Techniques
    • Bilinear Flow
    • Linear Flow
    • Pseudo Radial Flow
  • Practical Considerations
  • Case Histories
    • Falloff Testing of Hydraulic Fractured Wells

 

Injection Well Testing

  • Step Rate Tests
  • Analysis of Step Rate Tests for Formation Properties
  • Injectivity & Fall-Off Well Testing
  • Practical Considerations

 

Horizontal Well Testing

  • Flow Regimes of Horizontal Wells
  • Design of Transient Tests of Horizontal Wells
  • Horizontal Wells Transient Tests Analysis
  • Practical Considerations
  • Case Histories
    • Design of Horizontal Well Tests in Oil and Gas Reservoirs
    • Analysis of Horizontal Wells Buildup Tests

 

Numerical Well Testing

  • Current & Future Capabilities
  • Working Example
  • Practical Consideration
  • Case Histories
    • Irregular Boundaries and Composite Reservoirs

 

Production Data (Rate Transient) Analysis

  • Traditional Decline Curve Analysis
  • Model Based Production Data Analysis

 

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