Well casing fill apparatus and method
US5641021A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 15, 1995 |
| Grant date | Jun 24, 1997 |
| Priority date | — |
| Expiry date | Nov 15, 2015 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/16
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Improved well casing fill apparatus and methods for filling a casing string with well bore fluid while running the string into a well bore and then cementing the casing in the well bore are provided. A well casing fill apparatus of this invention is basically comprised of a tubular housing having a well bore fluid fill port extending through a wall thereof and a closing sleeve slidably disposed in the tubular housing between an upper open position whereby the fill port is uncovered to a lower closed position whereby the closing sleeve covers the fill port. The closing sleeve includes a cementing plug landing seat thereon for receiving a cementing plug and slidably moving the closing sleeve to the closed position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.