Formation volumetric evaluation while drilling
US4949575A · kind A · utility
40Cited by
2References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 27, 1989 |
| Grant date | Aug 21, 1990 |
| Priority date | — |
| Expiry date | Feb 27, 2009 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/06
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Formation Strength and other measurement while drilling parameters are combined to produce a formation volumetric analysis which may including the traditional volumetric components of clay volume, sand volume, total porosity, and water filled porosity. In shaley formations, the volumetric analysis may also include an excess or overpressure porosity. Formation Strength may be derived from measurements of torque and weight on bit and be corrected for such effects as bit dullness, mud weight and hydrostatic pressure balance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.