Interpretation workflow of pressure transitions in pressure test data in terms of well properties and formation properties of connected subsurface reservoirs.
It may
A specific interpretation workflow of pressure transition dynamics in terms of wellbore and formation properties of connected beddings.
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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 with abbreviation and indication of well flow status during the test:
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Objectives
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Primary deliverables | Math Symbol | Conditional Deliverables |
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Math Symbol |
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Current Formation |
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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 |
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Identify boundary type:
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| Half-size of drainage area |
Boundary type |
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Effective horizontal section |
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Hydraulic fracture |
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size |
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Dynamic fracture opening threshold |
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Proximity |
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Pick up the channel size/proximity
of the remote reservoir composition |
| Channel width and proximity to its nearest boundary Proximity to |
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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 well 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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