Method for calculating a distance between a well logging instrument and a formation boundary by inversion processing measurements from the logging instrument
US6594584B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 14, 2000 |
| Grant date | Jul 15, 2003 |
| Priority date | — |
| Expiry date | Dec 11, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/28
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method is disclosed for determining a position of a wellbore with respect to layer boundaries in earth formations. The method includes projecting a trajectory of the wellbore onto an initial model of the earth formations, selecting a segment of the trajectory and calculating along the segment expected responses of a well logging instrument. Differences between the expected responses and responses measured by the instrument along the segment are determined. The model is adjusted, the expected responses are recalculated and the differences are again determined. These are repeated until the differences fall below a selected threshold. In one embodiment, the trajectory of the wellbore can be adjusted to remain within a selected distance of a selected one of the layer boundaries.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.