Method for estimating a transit time of an element circulating in a borehole
US11060396B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 5, 2017 |
| Grant date | Jul 13, 2021 |
| Priority date | — |
| Expiry date | Feb 1, 2040 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/09
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The disclosure relates to a method for estimating a transit time of an element circulating in a borehole during the drilling of the borehole. The transit time is representative of a time period for the element to move from the bottom of the borehole to its exit at the surface. The method comprises measuring a plurality of drilling parameters, computing a first signal of a first indicator based on a first set of measured drilling parameters and a second signal of a second indicator based on a second set of measured drilling parameters versus time. The first indicator is representative of a first type of events happening at the bottom of the borehole and the second indicator is representative of a second type of events happening at the exit of the borehole linked to the first type of events. The method also comprises characterizing a correlation between the first and second signals and determining a shift between the first and second signals. An estimated transit time is then determined from the shift.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.