Casing filling and circulating apparatus and method
US5501280A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 27, 1994 |
| Grant date | Mar 26, 1996 |
| Priority date | — |
| Expiry date | Oct 27, 2014 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B34/06
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The present invention provides improved casing filling and circulating apparatus for running a casing string into a well bore using a drilling rig casing elevator and related equipment. The casing filling and circulating apparatus includes a flow passage therethrough and a check valve disposed within the flow passage for preventing spillage and for preventing fluid back-flow through the apparatus when the casing string is being lowered into a well bore. Additionally, the filling and circulating apparatus includes a pressure relief seal means which relieves pressure from the casing prior to when the filling and circulating apparatus is disconnected therefrom by back-flow through the apparatus thereby preventing spillage of fluid. Methods of using the casing filling and circulating apparatus are also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.