Well testing uses controlled changes in flow and pressure to obtain evidence about reservoir behaviour, well performance, connectivity and formation properties.
Reservoir evidence
A reservoir model contains assumptions about rock properties, connectivity and pressure behaviour. Well testing provides another form of evidence by observing how the formation responds when the well is produced, shut in or injected.
Proper test design, data quality and interpretation are therefore essential. The objective is not simply to obtain a pressure value, but to understand what the complete pressure and rate response says about the well and reservoir.
Testing workflow
The test moves from controlled data acquisition through pressure analysis and reservoir interpretation, creating evidence that can refine decisions throughout the asset lifecycle.
Define what the test must establish and design the programme around the well, reservoir and decision being investigated.
Key activities
Acquire reliable pressure, rate and fluid data under controlled well conditions.
Key activities
Analyse the pressure response of the well and reservoir to identify flow behaviour and formation characteristics.
Key activities
Use well-test behaviour to investigate reservoir extent, connectivity and pressure support.
Key activities
Connect test results to the performance of the well and its ability to deliver the expected production or injection rate.
Key activities
Convert measured behaviour into engineering conclusions that can support reservoir management, production and development decisions.
Key activities
Testing methods
The appropriate test depends on the well objective, reservoir conditions, available measurements and the decision the test needs to support.
Engineering interpretation
What is the objective of the test?
What does the pressure response tell us about the reservoir?
What are the formation permeability and skin characteristics?
Is the well performing as expected?
Are there boundaries, faults or compartmentalisation affecting flow?
How should the results change the reservoir or production model?
Engineering chain
Next stage
With the well tested and its behaviour better understood, the focus moves to sustained production, well performance and operating the asset.