Apparatuses and methods for adjusting a material's fluid content and effective stresses
US5253518A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 31, 1990 |
| Grant date | Oct 19, 1993 |
| Priority date | — |
| Expiry date | Aug 31, 2010 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B49/02
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Methods are disclosed for multi-stage tests of material samples, including but not limited to rock and shale samples, the methods, in one aspect, including the steps of placing a load on the sample, while under a constant confining pressure the sample mounted in a triaxial test apparatus; measuring and recording sample pore pressure continuously during the test; removing the load on the sample; changing confining pressure on the sample; permitting the sample's pore pressure to equilibrate at a new pore pressure with the new confining pressure; permitting the sample to drain fluid to an equilibrium value and placing a new load on the sample measuring and recording resulting pressure and load. In one embodiment these steps are repeated a plurality of times and a plurality of pore pressure, confining pressure, and load readings are obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.