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The PIK-GGK unit is designed to determine residual water saturation of pore volume within rock samples by desaturation method; with the use of a semipermeable membrane in accordance with OST 39-204-86 requirements. The method is based on draining mobile fluid off a rock sample through a semipermeable membrane as a result of excessive pressure in the desaturation chamber of a capillary unit. The rock sample is affected by pressure of a specified value until the sample water saturation becomes steady. As soon as the process is finished, the changes in the sample weight are captured and then the cycle repeats at a higher pressure level. This procedure designs initial water displacement from sedimentary rock with oil or gas and allows to directly determine the dependence of sample water saturation on capillary pressure.
The unit enables one to perform pressure analysis from 0,0007 to 1,38 MPa in all the range of rock permeability and the range of changing coefficient of pore volume saturation from 100 % to the residual irreducible value. |
Unit features
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| Technical specifications |
| Diameter of a sample under study | 30 mm; 38,1 mm; 100 mm; 110 mm |
| Inside diameter of a chamber | 315 mm |
| Sample length |
up to 150 mm |
| Operating temperature | 5 - 30 °C |
| Pressurized air input line | - pressurized air 1,38 MPa - pressurized nitrogen 1,73 MPa |
| Maximum desaturation pressure | 1,38 MPa |
| Minimum desaturation pressure | 0,0007 MPa |
| Control panel mass | 40 kg |
| Control panel dimensions (L х W х H) | 600 х 600 х 1200 mm |
| Desaturation chamber mass | 20 kg |
| Dimensions of desaturation chamber | diameter of 370 mm, height of 360 mm |
| Power supply parameters | ~220 V, 50±1 Hz |
| Total maximum power consumption | not over 0,2 kW |
