Use of axial accelerometer for estimation of instantaneous ROP downhole for LWD and wireline applications
US6769497B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 11, 2002 |
| Grant date | Aug 3, 2004 |
| Priority date | — |
| Expiry date | Jun 11, 2022 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/04
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Determination of the rate of penetration (ROP) of drilling has usually been based upon surface measurements and may not be an accurate representation of the actual ROP. This can cause problems in Logging While Drilling (LWD). Because of the lack of a high-speed surface-to-downhole communication while drilling, a conventional method of measuring ROP at the surface does not provide a solution to this problem. However, the instantaneous ROP can be derived downhole with a certain degree of accuracy by utilizing an accelerometer placed in (or near) the tool to measure acceleration in the axial direction. When three-component accelerometers are used, the method may be used to determine the true vertical depth of the borehole.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.