Methods for measuring physical parameters of a low permeability rock formation in situ
US5285692A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 18, 1992 |
| Grant date | Feb 15, 1994 |
| Priority date | — |
| Expiry date | Aug 18, 2012 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B49/006
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for determining drilling fluid density for stabilizing a wellbore including obtaining shale cuttings from a wellbore. In one embodiment of a method according to this invention, shale cuttings are obtained from a wellbore and their index properties, including but not limited to surface area, is measured; mean effective stress around the wellbore is calculated using the geostatic overburden in situ stress, the field pore pressure, and the total stress around the wellbore; the in situ shale strength is determined using a correlation between surface area, mean effective stress and shale strength; and drilling fluid density is determined using the shale strength. Methods for determining in situ shale strengths, elastic properties, pore pressures, and formation stresses of low permeability rocks.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.