Balanced or underbalanced drilling method and apparatus

Details Balanced or underbalanced drilling method and apparatus Balanced or underbalanced drilling method and apparatus

E - Fixed Constructions

21

B

E21B 7/00 (2006.01) E21B 21/08 (2006.01) E21B 21/10 (2006.01) E21B 21/14 (2006.01)

Patent

CA 2230364

A casing or tubing segment or segments are disclosed which can be used to create a parasite annulus during drilling. The cased wellbore receives a string containing valves and the drillstring operates through it. As the mud circulates, the segments of the tubing or casing provide communication at various depths from the parasite annulus (i e., the outermost annulus) into the circulating mud, which is the innermost annulus. Each valve is adjustable to alter the amount of differential pressure required in order to open it. The valves are also in hydraulic pressure balance so that only the pressure added by the injected gas acts to open them. The valves close by a spring bias.

Présentation d'une ou plusieurs sections de cuvelage ou de tubage pouvant être utilisées pour créer un espace annulaire parasite pendant le forage. Le puits tubé accueille une colonne de tubage contenant des vannes, et le train de tiges est actionné à travers elle. Pendant la circulation de la boue, les sections de tubage ou de cuvelage permettent la communication à des profondeurs variées à partir de l'espace annulaire parasite (c.-à-d., l'espace annulaire le plus à l'extérieur) dans la boue de circulation, qui se trouve dans l'espace annulaire le plus à l'intérieur. Chaque vanne peut être réglée afin de modifier la pression différentielle nécessaire à son ouverture. Les vannes sont également en équilibre pour ce qui est de la pression hydraulique de sorte que seule la pression ajoutée par le gaz qui est injecté agit pour les ouvrir. Les vannes se ferment sous l'effet d'un ressort.

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