Well apparatus
US4641707A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 22, 1984 |
| Grant date | Feb 10, 1987 |
| Priority date | — |
| Expiry date | Oct 22, 2004 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B2200/05
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
Well apparatus is disclosed in which the bore through a lower tubular body adapted to be packed off and anchored within a well bore is opened and closed by a flapper pivotally mounted on the lower body and spring pressed toward closed position, and a flow tube mounted for reciprocation within the bore of an upper tubular body releasably connected to the lower body extends downwardly through the bore of the upper and lower bodies to a position for engaging and moving the flapper to open position, as the flow tube is lowered by means of control fluid supplied to a pressure responsive operator connected to the flow tube, and permitting the flapper to close as the control fluid is exhausted from the operator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.