Positive indication system for well annulus cement displacement
US6668923B2 · kind B2 · utility
3Cited by
13References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 23, 2002 |
| Grant date | Dec 30, 2003 |
| Priority date | — |
| Expiry date | Apr 23, 2022 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B34/14
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An annulus collar around a well production tube is cast in cement by a procedure that axially delineates the collar between two expandable well packers in the production tube string. Between the packers are a pair of cementing valves. An ingress valve is most proximate to the lower packer whereas an egress valve is most proximate to the upper packer. Additionally, the egress valve is modified to enclose the egress valve with a screen having mesh or slot openings that correspond with a screen plugging material that is mixed with the cement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.