Pulse Decay Permeameter Model RCPDP-2A

RCPDP-2A,The Pulse Decay Permeameter employs a pressure pulse decay method for testing ultra-low permeability core samples, with a measurement range of 0.00001 to 0.1 millidarcy (md). In the unsteady-state method of pressure pulse decay, a control module initially applies a pore pressure to the core sample. It then transmits a differential pressure pulse through the sample. As this pressure transient propagates, a computerized data acquisition system records the differential pressure, downstream pressure, and time. These data are then plotted in real-time on a computer screen as a log curve of differential and mean pressures against time. Permeability is calculated through linear regression on the pressure and time data, and the results are stored in a data file. Using a very small differential pressure minimizes the impact of non-Darcy flow.

For porosity measurement, the gas expansion method is used, employing helium as the medium. The principle is based on Boyle's Law. A known volume of gas is subjected to an initial set pressure and is then allowed to undergo isothermal expansion into the core sample chamber at atmospheric pressure. As the gas diffuses into the pores of the rock, pressure changes and the known volume allow for the calculation of effective pore and grain volume, thereby determining the rock's porosity.

Key Features:

1. Unsteady-state      pressure pulse decay measurement technology, suitable for ultra-low core      samples with a range of 0.00001~0.1md.

2. Stable      measurement with short times, high speed, and accuracy.

3. Minimized      slippage and non-Darcy flow effects through the use of very small pressure      differences.

4. Utilizes      a core holder with a confining pressure up to 70MPa.

5. Fully      automated measurement process, with computer-controlled.

6. Automated      data acquisition system for recording data and calculating permeability.

Technical Specifications:

1. Working      medium: Nitrogen gas.

2. Core      sample diameter: 1" and 1.5".

3. Core      sample length: 0.75"-6".

4. Pore      pressure: 1000 psi.

5. Maximum      confining pressure: 10,000 psi.

6. Testing      temperature: Room temperature.

7. Measurement      range: Ultra-low permeability from 0.00001~0.1md.

8. Pressure      sensor accuracy: 0.1% (full-scale).

9. Power      supply: AC 220V/50 or 60 Hz(or AC 110V ), single phase.