Well cementing
US6675895B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 2002 |
| Grant date | Jan 13, 2004 |
| Priority date | — |
| Expiry date | Jul 31, 2022 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/13
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The combination of the cement contamination laboratory measurements and the field log measurement allows to perform the evaluation of cement placement and quality related to the designed percentage cement displacement coverage and set-up times in the casing annulus. Since the logging time after the cement job is completed is known, a comparison between the acoustic impedance or compressive strength measured using the USI log and the acoustic impedance or the compressive strength measured in the laboratory, a level of mud contamination can be derived at every point across the wellbore. From the laboratory correlations, cement strength prediction with time can be established. This new product will give the operator an accurate tool to recommend performing remedial cementing with a higher success rate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.