Title: 1 Type Curve Analysis of Well Test Data for Revealing Boundary Effects
11 Type Curve Analysis of Well Test Data for
Revealing Boundary Effects
21a Distance to Fault from "Stewart" Type Curve
Analysis
Pressure derivative Match Point
Time Match Point
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41b Distance to non-sealing Fault
"Abbaszadeh-Cinco"
Pressure derivative Match Point
Time Match Point
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72 Study Guide
- Big picture
- Organize
- Homeworks mini-quizzes class examples
8What 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
9Radial diffusivity eq
- Dimensionless Radius
- Dimensionless Time
- Dimensionless Pressure
-
10- Dimensionless Radius
- Dimensionless Time
- Dimensionless pressure
-
11 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
12Infinite-Acting
initial
Inner boundary constant rate
No outer boundary, virgin pressure "at very far"
- Cylindrical solution
- Line source solution (Exp Integral)
- Log approximation
13Other outer boundary conditions
- No flow circular shape
- No flow rectangular area (MBH method)
- Constant pressure outer boundary
14Incorporating 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
15Build-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
16Distance 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)
17Find your way
18Find your way