Method for measuring the rate of penetration of an equipment progressing in a well
US5321982A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 5, 1992 |
| Grant date | Jun 21, 1994 |
| Priority date | — |
| Expiry date | Oct 5, 2012 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B45/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The method comprises using a transmitting unit and at least two receiving units (8,10) arranged in two different places along well equipment (2). Each receiving unit forms an image or signature of wall portions which pass it. The signatures of wall portions formed by the lower receiving unit (8) when the well equipment is being lowered into the well are stored and the upper receiving unit (10) stores signatures coming from the wall portions which were previously stored by the lower receiving unit. A comparison (for example a correlation) of the signatures respectively coming from the two receiving units allows a common wall portion which has produced two substantially identical compared signatures to be identified. The time interval between the formation of the two substantially identical signatures is measured and the rate of penetration is calculated. As application of the invention is for the measurement of the true rate of penetration of a well tool or of a measuring sonde.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.