Method for drilling directional wells
US5230386A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 14, 1991 |
| Grant date | Jul 27, 1993 |
| Priority date | — |
| Expiry date | Jun 14, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/30
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A method for detecting and sensing boundaries between strata in a formation during directional drilling so that the drilling operation can be adjusted to maintain the drillstring within a selected stratum is presented. The method comprises the initial drilling of an offset well from which resistivity of the formation with depth is determined. This resistivity information is then modeled to provide a modeled log indicative of the response of a resistivity tool within a selected stratum in a substantially horizontal direction. A directional (e.g., horizontal) well is thereafter drilled wherein resistivity is logged in real time and compared to that of the modeled horizontal resistivity to determine the location of the drill string and thereby the borehole in the substantially horizontal stratum. From this, the direction of drilling can be corrected or adjusted so that the borehole is maintained within the desired stratum.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.