Apparatus and method for removing fluids from underground wells

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 43/16 (2006.01) E21B 43/12 (2006.01) F04B 47/00 (2006.01) F04F 1/08 (2006.01) F16K 31/122 (2006.01)

Patent

CA 2254722

An apparatus for supplying and venting gas to a downhole accumulation chamber (34) that includes a supply valve (70) having an open supply position to supply gas to the chamber (34) and a closed supply position, a vent valve (90) having an open vent position to vent gas from the chamber (34) and a closed position, and an actuator (109) communicating with a source of pressurized fluid (24) at the surface for actuating the supply (70) and vent (90) valves. The actuator (109) moves the supply valve (70) to the open position and the vent valve (90) to the closed position, and alternately moves the vent valve (90) to the open vent position and the supply valve (70) to the closed supply position. The actuator (109) may include a single hydraulically actuated reciprocating member or a pair of hydraulically actuated reciprocating members. When a pair of reciprocating members is utilized and the apparatus is used in connection with a tubing string having a flowbore, the hydrostatic pressure from the tubing string flowbore may be utilized to provide pressure on one side of each reciprocating member. The apparatus may also include biasing members for biasing each valve to either the open or closed position.

Dispositif pour amener et ventiler du gaz vers une chambre d'accumulation de fond (34), qui comporte une soupape d'alimentation (70) ayant une position d'alimentation ouverte pour amener du gaz à la chambre (34), et une position d'alimentation fermée; une soupape de respiration (90) ayant une position de ventilation ouverte pour ventiler le gaz venant de la chambre (34), et une position fermée; et un actionneur (109) communiquant avec une source de fluide sous pression (24) à la surface, pour actionner les soupapes d'alimentation (70) et de respiration (90). L'actionneur (109) fait passer la soupape d'alimentation (70) en position ouverte et la soupape de respiration (90) en position fermée, et alternativement fait passer la soupape de respiration (90) en position de ventilation ouverte et la soupape d'alimentation (70) en position d'alimentation fermée. L'actionneur (109) peut comporter un seul élément à va-et-vient hydraulique ou une paire d'éléments à va-et-vient. Quand une paire d'éléments à va-et-vient est utilisée et que le dispositif est employé en connexion avec un train de tubes pourvu d'un trou d'écoulement, la pression hydrostatique venant du trou du train de tubes peut être utilisée pour appliquer de la pression sur un côté de chaque élément à va-et-vient. Le dispositif peut également comporter des éléments de sollicitation qui poussent chaque soupape en position ouverte ou fermée.

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