Apparatus and method for blocking well perforations
US5456319A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 29, 1994 |
| Grant date | Oct 10, 1995 |
| Priority date | — |
| Expiry date | Jul 29, 2014 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/134
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Perforations and cracks in wellbore liners or casings may be temporarily or permanently covered by a radially-expansible, coiled sleeve member formed by a sheet of elastically-deflectable material such as stainless steel which is coiled and placed in a cylinder which may be conveyed into a well to a working position for deployment of the sleeve to expand into engagement with the casing wall to block the perforations or cracks. The cylinder includes a sleeve ejecting piston which may be urged to rapidly eject the sleeve from the cylinder by pressure fluid conveyed to the cylinder by coilable tubing or by a gas-generating charge material electrically connected to an E-line which also may be used to deploy the cylinder into its working position in the well.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.