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    01 - Introduction To Well Testing

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    shicko2112
    1. Well testing is conducted to characterize reservoirs and estimate properties like permeability. It provides data over a larger reservoir volume than cores or logs. 2. The diffusivity equation describes fluid flow in porous media and is used to model well test data. It accounts for factors like compressibility, porosity, permeability, and viscosity. 3. Important testing variables include formation volume factor, viscosity, fluid compressibility, porosity, permeability, pore compressibility, net pay thickness, saturation, and wellbore radius. These variables are used to calculate total system compressibility.

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    01 - Introduction To Well Testing

    Uploaded by

    shicko2112
    6K views32 pages
    1. Well testing is conducted to characterize reservoirs and estimate properties like permeability. It provides data over a larger reservoir volume than cores or logs. 2. The diffusivity equation describes fluid flow in porous media and is used to model well test data. It accounts for factors like compressibility, porosity, permeability, and viscosity. 3. Important testing variables include formation volume factor, viscosity, fluid compressibility, porosity, permeability, pore compressibility, net pay thickness, saturation, and wellbore radius. These variables are used to calculate total system compressibility.

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    reservoir Engineering

    Original Title

    01 - Introduction to Well Testing

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    1. Well testing is conducted to characterize reservoirs and estimate properties like permeability. It provides data over a larger reservoir volume than cores or logs. 2. The diffusivity equation describes fluid flow in porous media and is used to model well test data. It accounts for factors like compressibility, porosity, permeability, and viscosity. 3. Important testing variables include formation volume factor, viscosity, fluid compressibility, porosity, permeability, pore compressibility, net pay thickness, saturation, and wellbore radius. These variables are used to calculate total system compressibility.

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as PPT, PDF, TXT or read online from Scribd
    Download as ppt, pdf, or txt
    6K views32 pages

    01 - Introduction To Well Testing

    Uploaded by

    shicko2112
    1. Well testing is conducted to characterize reservoirs and estimate properties like permeability. It provides data over a larger reservoir volume than cores or logs. 2. The diffusivity equation describes fluid flow in porous media and is used to model well test data. It accounts for factors like compressibility, porosity, permeability, and viscosity. 3. Important testing variables include formation volume factor, viscosity, fluid compressibility, porosity, permeability, pore compressibility, net pay thickness, saturation, and wellbore radius. These variables are used to calculate total system compressibility.

    Copyright:

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    Download as PPT, PDF, TXT or read online from Scribd
    Download as ppt, pdf, or txt
    of 32

    Introduction to Well Testing

    Introduction to Well Testing


    Instructional Objectives

    1. List 4 objectives of well testing.

    2. Define testing variables.

    3. Compute compressibility of reservoir


    systems.
    Introduction To Well Testing
    Outline
    • Applications and objectives of well
    testing

    • Development of the diffusivity equation

    • Definitions and sources for data used


    in well testing
    What Is A Well Test?
    • A tool for reservoir evaluation and characterization
    – Investigates a much larger volume of the reservoir
    than cores or logs
    – Provides estimate of permeability under in-situ
    conditions
    – Provides estimates of near-wellbore condition
    – Provides estimates of distances to boundaries
    How Is A Well Test Conducted?
    q=0

    t
    Well Test Applications
    • Exploration

    • Reservoir engineering

    • Production engineering
    Well Test Objectives
    • Define reservoir limits

    • Estimate average drainage area pressure

    • Characterize reservoir

    • Diagnose productivity problems

    • Evaluate stimulation treatment


    effectiveness
    Types of Well Tests
    q

    Single-Well Multi-Well
    Development of the
    Diffusivity Equation
    The Diffusivity Equation

    • Describes the flow of

    – A slightly compressible fluid

    – Having constant viscosity

    – In a porous medium

    – At constant temperature
    The Continuity Equation

    (Aρ v)1 (Aρ v)2

     = ( Aρv ) 1 − ( Aρv ) 2
    m
    Equation of State for a Slightly
    Compressible Liquid

    c ( p −po )
    ρ = ρ oe
    Flow Equation - Darcy’s Law

    kA∆p
    q=
    µL
    or, in differential form,

    k x ∂p
    ux = −
    µ ∂x
    The Diffusivity Equation

    1 ∂  ∂p  φ c
    µ t ∂p
    r  =
    r ∂r  ∂r  k ∂t
    Data Used in Well Testing
    Formation Volume Factor

    Vres
    Bo =
    Vsurf
    Viscosity

    v + dv

    dy v

    F
    µ≡
    dv
    A
    dy
    Fluid Compressibility

    1 ∂Vo ∂ ln( Vo )
    co ≡ − =−
    Vo ∂p ∂p
    Porosity
    Permeability

    qµL
    k=
    A∆p
    Pore Compressibility

    1 ∂φ ∂ ln( φ )
    cf ≡ =
    φ ∂p ∂p
    Net Pay Thickness
    Shale
    h1 Sand

    h2

    h3

    h = h1 + h2 + h3
    Net Pay Thickness

    Case 1 Case 3

    Case 2 Case 4
    Saturations
    H2O
    Wellbore Radius

    rw
    Total Compressibility

    c t = c f + S o c o + S w c w + S gc g
    Exercise 1

    • List 4 objectives of well testing


    Exercise 2

    • Define variables used in well testing


    Exercise 3

    • Calculate total compressibility for an


    undersaturated oil reservoir
    Exercise 4

    • Calculate total compressibility for a


    saturated oil reservoir
    Exercise 5

    • Calculate total compressibility for a


    low-pressure, high-permeability gas
    reservoir
    Exercise 6

    • Calculate total compressibility for a


    high-pressure, low-permeability gas
    reservoir

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