A specific implementation of Well Testing based on recording and interpretation of borehole (downhole or THP) pressure response to the pre-designed flow rate variations (also called "cycles" or "pulses" ) at one or more disturbing wells inducing pressure pulse propagation across the field.
The usual practise is to create 3 - 5 pulses.
The pressure response can be recorded in
- the same well where the flowrate is varying (called Self-Pulse Test)
or
- the offset well (called Pressure Pulse Interference Test)
The physics of pressure pulse propagation. across the field has some specifics.
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.
In case of non-harmonic and non-periodic pressure pulse response should be decoded from possible trend contamination and then matched by numerical model and the test is usually called Pressure Pulse-Code Test.