Downhole tubing conveyed valve

Wells – Processes – Operating valve – closure – or changeable restrictor in a well

Patent

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Details

166126, 166142, 166150, 166317, 166318, 1663325, E21B 3406

Patent

active

058652540

ABSTRACT:
A downhole valve is disclosed for use in a tubing-conveyed string of tools in a well bore, constructed to be actuated to open under pressure forces by dropping a drop bar from the well surface through the tubing. The valve, deployed in the well in a closed condition, has a frangible member arranged to be broken by the drop bar to enable the valve to open. The valve opens under well pressure forces when well pressure exceeds tubing pressure, and opens under tubing pressure forces when tubing pressure exceeds or substantially equals well pressure. The valve is particularly useful when opened in conjunction with the detonation of a perforating gun for overbalanced or underbalanced well perforation. Methods of operating a string of tools including the valve are also disclosed.

REFERENCES:
patent: 4664184 (1987-05-01), Grigar
patent: 4846272 (1989-07-01), Leggett
patent: 4969524 (1990-11-01), Whiteley
Owen Oil Tools product literature, Feb. 1995, Fort Worth, Texas (2 pages).
Schlumberger Perforating Services manual, 1993, Houston, Texas(5 pages).
Schlumberger RPPV Maintenance Manual, Mar. 1994, Rosharon, Texas (10 pages) .

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