Part of Well & Reservoir Surveillance and one of the Subsurface Production E&P Disciplines, related to measuring well volumetric flow rate and wellbore pressure in one or few selected wells and analysing pressure-rate correlation.
Unlike production analysis which normally covers a time period from few months to many years, well tests are rather short and normally take from few hours to few weeks.
The quantitative interpretation is based on on:
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- with a purpose of dynamic reservoir properties analysis
- well completion model with a purpose of Leak Detection
There are different ways to classify the well tests classifications.
One way is to split well tests into two major categories:
Pressure |
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Tests | Flowrate |
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Tests | |
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DST – Drill Stem Test | SBT – Separator Bulk Test |
WFT – Wireline Formation Test | Surface Multiphase Flowmeter |
SGS – Static Gradient Survey | Downhole Multiphase Flowmeter |
PTA – Pressure Transient Analysis |
The other way is to split well tests by data acquisition methodology into three categoriesthe location where the measurements are taken and the well completion status:
Surface |
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Well Tests | Subsurface Well Tests | |
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Open-Hole |
Well Tests | Cased-Hole |
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Well Tests | ||
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Surface Flowmeter | DST – Drill Stem Test | Downhole Flowmeter |
WFT – Wireline Formation Test | SGS – Static Gradient Survey | |
PTA – Pressure Transient Analysis |
Third way is to split well tests by number of wells involved:
PIST – Pressure Interference Step Test (as version of PTA) | |
PICT – Pressure Interference Pulse Test (as version of PTA) | |
DST – Drill Stem Test | |
WFT – Wireline Formation Test | |
Drawdown Test (DD) (as version of PTA) | |
Injection Test (INS) (as version of PTA) | |
Build-up Test (BUS) (as version of PTA) | |
Fall off Test (FOS) (as version of PTA) | |
MRST – Multirate Step Test (as version of PTA) | |
SPT – Self-Pulse Test (as version of PTA) |
See Also
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Petroleum Industry / Upstream / Subsurface E&P Disciplines
[ Well & Reservoir SurveillanceWell logging ]
Reference
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