Gaz De France

Jean-Yves Le Gac

Denis Devilleger

Philippe Majewski

The bleeder comprises a hydraulically remotely controlled bleed valve (150) and device for guaranteeing that during bleeding, the gas is exhausted away from the well head zone. The bleed valve (150) is advantageously situated at the top end of the pressure lock and has a valve body (9) defining a main channel (17) of sufficient cross-section to pass to wireline tool. The bleed valve also has a gas exhaust lateral orifice (16) for being put selectively into communication with a first transverse channel (15) which opens out into the main channel (17) by a closure member constituted by a valve seat and a valve member formed at one end of a piston (5). A second transverse channel (14) puts the main channel (17) into communication with a rear face of the piston (5), where the rear face has a greater section than its valve-forming front face. A lateral hydraulic fluid receiving control orifice (13) is connected to a hydraulic remote control flexible hydraulic pipe and opens out into a bore defining an annular space around a portion of the piston (5), the bore being of smaller section than the rear face of the piston in contact with the gas present in the second transverse channel (14).

A hydraulic remotely-controlled bleeder valve for a well head

The invention relates to an isolation chamber valve. The isolation chamber valve of the invention includes, for connecting its inlet passage and its outlet passage, a by-pass circuit of small section comprising at least a flap the opening and closing of which can be controlled as required. This isolation chamber valve is used in particular in the operation of shafts for deposits or the storage of gas or other fluids under pressure.

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Beynes, France

Jean-Yves Le Gac