Method for producing maps of the risk in positioning a well in an environment
US6016461A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 22, 1998 |
| Grant date | Jan 18, 2000 |
| Priority date | — |
| Expiry date | May 22, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V2210/66
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The method consists in using a first interpreted horizon (H.sub.0) extracted from a seismic block migrated with at least a first value of a velocity (V) known with an uncertainty (.DELTA.V), and is characterized in that it consists in performing the following steps: PA1 a) making a second interpreted horizon (H.sub.1) by migration of the first horizon (H.sub.0) using a second value (V+.DELTA.V) of the velocity, equal to the first value (V) plus the uncertainty (.DELTA.V); PA1 b) making a third interpreted horizon (H.sub.2) by migration of the first horizon (H.sub.0) using a third value (V-.DELTA.V) of the velocity, equal to the first value (V) less the uncertainty (.DELTA.V); PA1 c) selecting a positioning point (X.sub.0) for the well on the said first horizon (H.sub.0) and plotting a vertical (D) which passes through the said point (X.sub.0) and intersects the second and third horizons(H.sub.1 and H.sub.2) at migrated points (X.sub.1, X.sub.2); PA1 d) on the said first interpreted horizon (H.sub.0), determining the positions (A, B) corresponding to the said migrated points (X.sub.1, X.sub.2), the portion of the first interpreted horizon (H.sub.0) located between the said positions…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.