Downhole application for a backpressure valve

E - Fixed Constructions – 21 – B

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Details

E21B 21/10 (2006.01) E21B 21/08 (2006.01) E21B 41/00 (2006.01) E21B 47/18 (2006.01)

Patent

CA 2741318

A backpressure valve. The backpressure valve may be configured to maintain a substantially controlled pressure in bottom hole assembly while simultaneously being compatible with a pressure pulse tool downhole thereof. The backpressure valve includes pressure generating capacity below its internal valve assembly so as to avoid the tendency of the assembly to throttle open and closed. Furthermore, the pressure generation is achieved in a manner avoiding cavitation. As a result, once the back-pressure valve is opened, the pressure pulse tool is able to reliably communicate with surface equipment at the oilfield.

L'invention concerne une vanne de régulation de contre-pression, la vanne de régulation de contre-pression pouvant être configurée pour maintenir une pression sensiblement contrôlée dans l'ensemble de fond de trou tout en étant simultanément compatible avec un outil générateur d'impulsions de pression situé en aval. La vanne de régulation de contre-pression comprend une unité génératrice de pression au-dessous de son ensemble vanne interne, de façon à éviter la tendance à létranglement de l'ensemble à létat ouvert et à létat fermé. En outre, la génération de pression est obtenue en évitant toute cavitation. En conséquence, une fois que la vanne de régulation de contre-pression est ouverte, l'outil générateur d'impulsions de pression peut communiquer de façon fiable avec l'équipement de surface du champ pétrolifère.

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