Apparatus for measuring bottom hole well conditions
US4415028A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 8, 1981 |
| Grant date | Nov 15, 1983 |
| Priority date | — |
| Expiry date | Sep 8, 2001 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B47/06
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An apparatus for measuring bottom hole conditions such as pressure in the tubing of a well including a locking and sealing sub to lock into and seal against the interior of the tubing, an isolation valve connected in the sub and a measuring instrument connected to the valve for measuring conditions in the tubing. The isolation valve has a bore with an annular seat in the bore and side ports leading into the bore below the seat. A valve element is longitudinally movable in the valve between an open position below the ports and a closed position against the seat and includes an elongate mandrel having a backup shoulder. A latch mechanism initially holds the valve in the open position and includes a collet member initially engaging the mandrel and holding the valve element in the open position and the collet is held in a latched position by a spring loaded backup shoulder. Spring means yieldably urge the collet out of engagement with the mandrel and close the valve when the backup shoulder is moved out of engagement with a collet. The valve flow passageway is as large as the bore through the locking sub. A closing prong which actuates the valve to the closed position has a cross-secti…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.