Characterizing a downhole environment using stiffness coefficients
US9784876B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 30, 2014 |
| Grant date | Oct 10, 2017 |
| Priority date | — |
| Expiry date | Apr 30, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V2210/6242
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method that includes obtaining log data of a downhole formation, and characterizing the downhole formation by determining stiffness coefficients including C33, C44, C66, C11, C12, and C13. C13 is a function of C33, C44, C66, and at least one of a kerogen volume and a clay volume derived from the log data. In another method or system, C13 is derived based at least in part on C11 calculated as C11=k1[C33+2(C66−C44)]+k2 or C33 calculated as C33=((C11−k2)/k1)−2(C66−C44), where k1 and k2 are predetermined constants. In another method or system, C13 is derived in part from at least one of a kerogen volume derived from the log data, a clay volume derived from the log data, C11 calculated as C11=k1[C33+2(C66−C44)]+k2, or C33 calculated as C33=((C11−k2)/k1)−2(C66−C44), where k1 and k2 are predetermined constants.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.