Pore pressure formation evaluation while drilling
US4833914A · kind A · utility
40Cited by
8References
15Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 29, 1988 |
| Grant date | May 30, 1989 |
| Priority date | — |
| Expiry date | Apr 29, 2008 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B49/003
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Formation strength and other measurement while drilling parameters are combined in a formation volumetric analysis which produces not only the traditional volumetric components of clay volume, mineral volume, total porosity, and water filled porosity, but also, in shaley formations, an excess or overpressure porosity. The overpressure porosity is then utilized to generate an indication of pore pressure which in turn is used in the drilling process as an aid in determining the lowest optimal drilling mud weight for most efficient drilling without incurring excessive risks of a blowout arising from an overpressured formation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.