Neutron porosity downhole tool with improved precision and reduced lithology effects
US9372277B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 21, 2010 |
| Grant date | Jun 21, 2016 |
| Priority date | — |
| Expiry date | Apr 28, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V5/107
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Systems and methods for neutron porosity well logging with high precision and reduced lithology effects are provided. In accordance with an embodiment, a downhole neutron porosity tool may include a neutron source, a neutron monitor, a neutron detector, and data processing circuitry. The neutron source may emit neutrons into a subterranean formation while the neutron monitor detects a count of neutrons proportional to the neutrons emitted. The neutron detector may detect a count of neutrons that scatters off the subterranean formation. The data processing circuitry may determine an environmentally corrected porosity of the subterranean formation based at least in part on the count rate of neutrons scattered off the subterranean formation normalized to the count rate of neutrons proportional to the neutrons emitted by the neutron source.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.