Pulse Decay Permeameter-PDP-200 is used for Ultra-Low Permeability Determination
of Cap Rock, Tight Gas Sand Stone, and other very low permeability rock. The Pulse
Decay Permeameter is similar in appearance to the steady-state Ultra-Permeameter™
systems but uses a pulse decay measurement technique developed by Core Laboratories.
The system can be easily attached to the users existing coreholders.
The Pulse Decay Permeameter system saturates the sample to a set pore pressure,
then transmits a differential pressure pulse through the sample. As the pressure
transient propagates though the sample, the computerized data acquisition system
records the delta pressure across the sample, the downstream pressure, and time.
A log differential pressure times mean pressure versus time plot is displayed real
time on screen allowing visual quality control of the permeability measurement.
Permeability is calculated from a linear regression performed on the pressure time
data and the results stored to a data file. The use of a small Δ P minimizes non-Darcian
flow effects and by utilizing multiple pore pressures Klinkenberg permeabilities
can be determined in the conventional manner.
Pulse-Decay Permeameter Unit Module with Transducers, plumbing, electronics and
interface board. System software: Windows based operating software allows data generation
and report preparation. Computer, P4, 128MB RAM, 20GB hard Drive, SVGA, Mouse, Keyboard,
Windows O/S, cabling and other software as necessary.