Automatic fill-up floating apparatus
US4683955A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 30, 1986 |
| Grant date | Aug 4, 1987 |
| Priority date | — |
| Expiry date | Apr 30, 2006 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B21/10
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An automatic fill-up floating apparatus usable in a float collar or a float shoe in a casing string. The apparatus includes a housing having a back check valve positioned therein. A spring biases the valve toward a closed position. A filling body is disposed across an opening at a lower end of the housing and includes a flow passage therethrough. The filling body is shearably pinned to a valve stem extending from the valve and has a holding position in which the valve is held in an open position. A resilient washer is annularly positioned around the valve stem and above the filling body. The washer is free to move upwardly in response to upward movement of flow through the flow passage in the filling body as the casing string is lowered into a well. The floating apparatus may be tripped by pumping fluid downwardly through the casing strings such that the washer is forced against the filling body, sealingly covering the flow passage therethrough. When there is sufficient differential pressure across the washer and filling body, the shear pin will be sheared such and the body released from the valve stem. Thereafter, the spring will be free to move the valve to a closed position when…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.