Well flow control device
US4520870A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 27, 1983 |
| Grant date | Jun 4, 1985 |
| Priority date | — |
| Expiry date | Dec 27, 2003 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B34/063
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A well flow control device for use in an oil and/or gas well tubing string for communicating between the tubing string and the annulus. A tubular body having a plurality of openings with a sleeve telescopically movable in the interior of the body and initially covering and closing the openings. A plurality of dogs are carried by the sleeve in windows which taper upwardly and inwardly. The dogs include a ball which engages a backup shoulder in the body to hold the dogs inwardly when the sleeve covers the openings. The sleeve includes a shoulder engaging the balls for limiting the extent of the inward movement of the dogs and the body includes a recess to receive the dogs when the sleeve is moved to an opening position. Mechanical or hydrostatic shear releases are provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.