System and method for estimating formation supercharge pressure
US7647824B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 19, 2007 |
| Grant date | Jan 19, 2010 |
| Priority date | — |
| Expiry date | Sep 16, 2027 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B49/087
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method of estimating a formation pressure in a wellbore is provided that in one aspect includes measuring a hydrostatic pressure at a selected location in the wellbore, and estimating supercharge pressure as a function of time using a forward model that utilizes the hydrostatic pressure and at least one property of mud in the wellbore that is a function of time. In another aspect, the method may estimate an initial formation pressure at a selected location in a wellbore by obtaining a hydrostatic pressure and at least three formation pressure measurements at three separate times at the selected location, and estimating the initial formation pressure using the hydrostatic pressure, the three pressure measurements and an internal mudcake parameter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.