1 Type Curve Analysis of Well Test Data for Revealing Boundary Effects

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1 Type Curve Analysis of Well Test Data for
Revealing Boundary Effects
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1a Distance to Fault from "Stewart" Type Curve
Analysis
Pressure derivative Match Point
Time Match Point

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1b Distance to non-sealing Fault
"Abbaszadeh-Cinco"
Pressure derivative Match Point
Time Match Point

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2 Study Guide

• Big picture
• Organize
• Homeworks mini-quizzes class examples

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What have we learned?

• Radial diffusivity equation
• Dimensionless variables (conversion factors)
• Initial and boundary conditions (outer, inner)
• Solutions, various approximations, well testing
  derivative
• Superposition is space and time
• Build-up analysis
• Time regions
• Plots and methods
• Parameters we can obtain

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Radial diffusivity eq

• Dimensionless Radius
• Dimensionless Time
• Dimensionless Pressure

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• Dimensionless Radius
• Dimensionless Time
• Dimensionless pressure

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1 md 9.869233 10-16 m2 1 bbl 0.1589873
m3 1 psi 6894.757 Pa 1 ft 0.3048 m 1 cp
0.001 Pa s 1 day 243600 s 1 hr 3600 s
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Infinite-Acting
initial
Inner boundary constant rate
No outer boundary, virgin pressure "at very far"

• Cylindrical solution
• Line source solution (Exp Integral)
• Log approximation

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Other outer boundary conditions

• No flow circular shape
• No flow rectangular area (MBH method)
• Constant pressure outer boundary

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Incorporating wellbore st. and skin into the
inner boundary condition
Constant prod rate
Constant wb prod rate wellbore storage
Constant wb prod rate skin
Constant prod rate wellbore storage skin
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Build-up analysis

• Type curve
• Concept
• Derivative
• Match
• Time regions
• Wellbore storage distortion
• Middle time
• Line source solution (Exp Integral solution)
• Log approximation
• Superposition in time
• MDH (k, s)
• Horner (k,s, p)
• Late time
• Modified Muskat

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Distance to fault in otherwise infinite acting
reservoir
Average pressure (in not infinite acting)

• HornerMBH
• Modified Muskat

• Horner analysis double slope (for fault)
• Type Curve Analysis (derivative) (for fault)

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Find your way
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Find your way