Identification of cement in subterranean borehole regions using a ratio of capture to inelastic gamma rays
US11078771B2 · kind B2 · utility
1Cited by
9References
14Claims
0Family size
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Key dates
| Filing date | Dec 24, 2018 |
| Grant date | Aug 3, 2021 |
| Priority date | — |
| Expiry date | Jan 5, 2039 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/11
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Methods are provided for determining the location and height of cement in a subterranean borehole region using pulsed neutron capture (PNC) logging tools. The methods include obtaining a pre-cementing data set, placing in the borehole region a cement slurry that includes a liquid a thermal neutron absorbing material, obtaining a post-cementing data set, comparing the pre-cementing data set and the post-cementing data set to determine the location of the cement, and correlating the location of the cement to a depth measurement of the borehole to determine the location and height of the cement placed in the borehole region.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.