Interpretation workflow of pressure transitions in pressure test data in terms of well properties and formation properties of connected subsurface reservoirs.
It may
Specific implementation of Well Testing interpretation workflow of pressure transitions in terms of well properties and formation properties of connected subsurface reservoirs.
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refer to analysis of a stand-alone pressure transient
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or several pressure transients (MRST) and may also cover transitions in off-set wells (PIT).
Both downhole (BHP) and surface (THP) pressure records can be a source
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data to PTA.
The quantitative interpretation of pressure transitions is based on pressure diffusion model.
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Below are the major types of PTA
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with abbreviation and indication of well flow status during the test:
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DD | INS | BUS | FOS | MRST | PIT |
Producer | Injector | Producer | Injector | Producer / Injector | Producer / Injector → Producer / Injector |
FLOWING | FLOWING | SHUT-IN | SHUT-IN | FLOWING | FLOWING → |
Objectives
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Primary deliverables | Math Symbol | Conditional Deliverables | Math Symbol |
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Current |
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Initial formation pressure assuming no or little historical interference with offset wells |
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Assess formation damage
Assess formation penetration
Formation damage as permeability deterioration assuming damage penetration is known Formation damage penetration assuming damage value is known Fracture |
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-network development around the well | |||||
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Permeability assuming flowing thickness
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Flowing thickness assuming permeability
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Water-oil column assuming permeability
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Minimum drainable volume around the well |
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Minimum hydrocarbon reserves around the well |
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Drainage area around the well assuming flowing thickness
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Flowing thickness assuming the drainage area
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Boundary proximity assuming the circular boundary |
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Minimum drainable area around the well |
| Half-size of drainage area
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Boundary type |
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Effective horizontal section |
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Hydraulic fracture size |
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Dynamic fracture opening threshold |
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Proximity
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| Channel width and proximity to its nearest boundary Proximity to |
Pick up the channel size/proximity
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oil-water front |
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Proximity to |
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oil-gas front |
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Scanning area around the well |
| Scanning radius of the area
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Interpretation
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Samples
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Fig. 1. Transient |
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response in vertical |
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well. Pressure drop is in blue and log-derivate of Pressure drop is in red | Fig. 2. Transient |
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response in horizontal |
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Pressure drop is in blue and log-derivate of Pressure drop is in red |
See Also
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Petroleum Industry / Upstream / Subsurface E&P Disciplines / Well Testing / Pressure Testing
[ Well & Reservoir Surveillance ] [ PTA Diagnostic Plot ]
[ Rate Transient Analysis (RTA) ]
References
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