Determination of borehole shape using standoff measurements
US11371340B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 7, 2018 |
| Grant date | Jun 28, 2022 |
| Priority date | — |
| Expiry date | Mar 18, 2040 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B2200/20
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A downhole tool is placed in a borehole of a subsurface formation. The downhole tool comprises a plurality of calipers arranged around a circumference of the downhole tool. A plurality of standoff measurements is received for different rotation angles of the downhole tool, wherein each standoff measurement is indicative of a distance between one of the plurality of calipers and a wall of the borehole. A plurality of apparent diameters of the borehole is determined for the different rotation angles of the downhole tool based on the plurality of standoff measurements and a radius of the downhole tool. A probability function is determined based on the plurality of apparent diameters and at least one of a semiminor axis, semimajor axis, and ellipticity of the borehole is identified based on the probability function.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.