Pressure Transient Analysis — Boundary Effects
Demonstrates pressure transient analysis with three boundary models: infinite reservoir, single sealing fault, and perpendicular faults (channel). Shows PD vs tD on a table with log-log diagnostic chart showing characteristic boundary signatures.
Pressure Transient Analysis
Excel workbook
Inputs
Named cells you can edit — every result recalculates from them.
| Name | Description | Default | Unit |
|---|---|---|---|
PTA_K |
Permeability | 50 | mD |
PTA_Poro |
Porosity | 0.2 | fraction |
PTA_Visc |
Viscosity | 1.5 | cP |
PTA_Ct |
Total Compressibility | 1.5e-5 | 1/psi |
PTA_Rw |
Wellbore Radius | 0.35 | ft |
PTA_CD |
Dimensionless Storage (CD) | 100 | dimensionless |
PTA_S |
Skin Factor | 0 | dimensionless |
PTA_L1 |
Distance to Fault 1 | 500 | ft |
PTA_L2 |
Distance to Fault 2 | 800 | ft |
2 sheets, shown with the values the file opens with
| A | B | C | D | E | F | |
|---|---|---|---|---|---|---|
| 1 | Pressure Transient Analysis — Inputs | |||||
| 2 | Define reservoir and well properties. The Boundary Comparison sheet calculates dimensionless pressure for three boundary models: infinite reservoir, single sealing fault, and channel (two faults). | |||||
| 3 | ||||||
| 4 | Reservoir Properties | |||||
| 5 | Permeability | 50 | mD | |||
| 6 | Porosity | 0.2 | fraction | |||
| 7 | Viscosity | 1.5 | cP | |||
| 8 | Total Compressibility | 1.5E-05 | 1/psi | |||
| 9 | Wellbore Radius | 0.35 | ft | |||
| 10 | ||||||
| 11 | Well Parameters | |||||
| 12 | Dimensionless Storage (CD) | 100 | dimensionless | |||
| 13 | Skin Factor | 0 | dimensionless | |||
| 14 | ||||||
| 15 | Boundary Distances | |||||
| 16 | Distance to Fault 1 | 500 | ft | |||
| 17 | Distance to Fault 2 | 800 | ft | |||
| 18 | ||||||
| 19 | Dimensionless Distances | |||||
| 20 | LD1 | 1428.571429 | dimensionless | |||
| 21 | LD2 | 2285.714286 | dimensionless |
| A | B | C | D | E | F | |
|---|---|---|---|---|---|---|
| 1 | Dimensionless Pressure — Boundary Comparison | |||||
| 2 | PD vs tD for three boundary conditions. On a log-log plot, the infinite reservoir shows a half-unit slope at early time. A fault doubles the slope at late time. A channel shows unit slope. | |||||
| 3 | ||||||
| 4 | PD vs tD | |||||
| 5 | tD | PD (Infinite) | PD (Fault) | PD (Channel) | ||
| 6 | 1 | 0.009903122767 | 0.009903122767 | 0.009903122767 | ||
| 7 | 2 | 0.01970386417 | 0.01970386417 | 0.01970386417 | ||
| 8 | 5 | 0.04867067822 | 0.04867067822 | 0.04867067822 | ||
| 9 | 10 | 0.09578722054 | 0.09578722054 | 0.09578722054 | ||
| 10 | 20 | 0.1864918267 | 0.1864918267 | 0.1864918267 | ||
| 11 | 50 | 0.4365516218 | 0.4365516218 | 0.4365516218 | ||
| 12 | 100 | 0.7975425562 | 0.7975425562 | 0.7975425562 | ||
| 13 | 200 | 1.372371621 | 1.372371621 | 1.372371621 | ||
| 14 | 500 | 2.435715863 | 2.435715863 | 2.435715863 | ||
| 15 | 1000 | 3.268100922 | 3.268100922 | 3.268100922 | ||
| 16 | 2000 | 3.927424312 | 3.927424312 | 3.927424312 | ||
| 17 | 5000 | 4.558492223 | 4.558492223 | 4.558492223 | ||
| 18 | 10000 | 4.956673407 | 4.956673407 | 4.956673407 | ||
| 19 | 20000 | 5.328754782 | 5.328754782 | 5.328754782 | ||
| 20 | 50000 | 5.80269505 | 5.80269505 | 5.80269505 | ||
| 21 | 100000 | 6.154827318 | 6.154827318 | 6.154827318 | ||
| 22 | 200000 | 6.504326328 | 6.504327992 | 6.504327992 | ||
| 23 | 500000 | 6.964333018 | 6.966045007 | 6.966046297 | ||
| 24 | 1000000 | 7.311566754 | 7.334677371 | 7.335161711 | ||
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| Name | Refers To | Comment |
|---|---|---|
| PTA_CD | Inputs!$B$12 | |
| PTA_Ct | Inputs!$B$8 | |
| PTA_K | Inputs!$B$5 | |
| PTA_L1 | Inputs!$B$16 | |
| PTA_L2 | Inputs!$B$17 | |
| PTA_Poro | Inputs!$B$6 | |
| PTA_Rw | Inputs!$B$9 | |
| PTA_S | Inputs!$B$13 | |
| PTA_Visc | Inputs!$B$7 |
| Opens in | Needs the Petroleum Office add-in: its PO functions show #NAME? without it once Excel recalculates. |
| Functions used | PO.PTA.PD.VWPO.PTA.PD.VW.LinSealFPO.PTA.PD.VW.PerpSealFPO.PTA.ToDim.LD |
| File | PTAFunctions.xlsx, 11 KB |
| Category | Reservoir |
| For agents and tools | Structure (.json) · Descriptor (.md) |