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A specific implementation of Well Testing based on recording and interpretation of borehole (downhole or THP) pressure response to the pre-designed sequence of increasing and decreasing flow rate variations (also called "cycles" or "pulses" ) at one or more wells (called "generators" or "pulsers") inducing pressure pulse propagation across the field.
The usual practise practice is to create 5 – 10 pulses.
The pressure response to rate variation is recorded in the:
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It splits into two categories:
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| Pressure Pulse Interference Test (PIT) | |
|---|---|
The pressure response to rate variation are both recorded in the same well | The pressure response to rate variation is recorded in the offset wells |
Workflow
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| 1 | Designing flowrate variation pulse sequence for disturbing wells (also called generators) based on the field primary data |
| 2 | Field operations on suspending the downhole gauges (if PDG is not available) |
| 3 | Performing flowrate variations according to the PCT design |
| 4 | Retrieving the downhole gauges |
| 5 | Downloading the data from the downhole and surface gauges |
| 6 | Primary data processing (gauge syncronization and filtering) |
| 7 | Implementing pressure pulse-code decomposition (PCD) |
| 8 | Recognising the PTA type-library diffusion models for decomposed DTR/CTR and type-curve fitting them with analytical and/or numerical pressure diffusion models |
Data Processing
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In case of harmonic pressure pulsations and sufficiently long pressure-rate delay and a simple diffusion model (single-bed homogeneous reservoir without boundary) the pressure response can be approximated by analytical model. In this case the pressure data at receiving wells are being detrended and then matched to analytical model.
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This type of tests is called Pressure Pulse-Code Test but this approach is equally applicable to simple periodic pulsations.
Interpretation
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See Also
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Petroleum Industry / Upstream / Subsurface E&P Disciplines / Well Testing / Pressure Testing / Cased-Hole Pressure Transient AnalysisTest / Pressure Interference Test (PIT)
[ Well & Reservoir Surveillance ] [ Unit-rate transient response (UTR) ] [ Pressure Pulse Propagation ]
References
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