Interval density pressure management methods
US9134451B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 14, 2012 |
| Grant date | Sep 15, 2015 |
| Priority date | — |
| Expiry date | Jul 30, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F15/00
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method for estimating equivalent top of fluid level or a theoretical surface annular back pressure in a subterranean wellbore includes acquiring first and second axially spaced pressure measurements in the wellbore. The pressure measurements may then be processed to compute the equivalent top of fluid level and/or theoretical surface annular back pressure of drilling fluid between the measurement locations. A tool string including a large number of axially spaced pressure sensors (e.g., four or more or even six or more) electronically coupled with a surface processor via wired drill pipe may be used to obtain a plurality of values corresponding to various wellbore intervals. The equivalent top of fluid level and/or theoretical surface annular back pressures may be used in automated managed pressure drilling operations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.