Downhole annulus evaluation apparatus, systems, and methods
US10061054B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 2015 |
| Grant date | Aug 28, 2018 |
| Priority date | — |
| Expiry date | Jul 31, 2035 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B43/04
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Disclosed are apparatus, systems, and methods for determining the completeness of the cement sheath or gravel-pack annulus of a borehole based on gamma counts or count rates measured with a pulsed neuron tool deployed in the borehole in conjunction with a quantitative relationship between certain gamma count (rate) ratios and a parameter of completeness. In various embodiments, the determination utilizes the ratio of the net long inelastic count (rate) and the near capture count (rate), or the ratio of the net near inelastic count (rate) and the long capture count (rate). Additional apparatus, systems, and methods are disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.