Method and system for vertical seismic profiling by measuring drilling vibrations
US4965774A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 26, 1989 |
| Grant date | Oct 23, 1990 |
| Priority date | — |
| Expiry date | Jul 26, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V2210/161
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Seismic measurements are taken during drilling operations by an array of seismometers placed on the earth's surface about the axis of a drillstring connected to a conventional drillbit and wherein the drillstring has an arrangement of strain gages and accelerometers mounted thereon in such a way as to measure axial and torsional vibrations of the drillstring. Signals indicating vibrations induced by the drillbit or another source and transmitted through the drillstring are compared with signals received by the seismometer array to determine the characteristics of the formation based on measurement of acoustic velocity from direct and reflected transmission of acoustic vibrations through the formation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.