Hydraulic stepping valve actuated sliding sleeve

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 34/10 (2006.01) E21B 34/14 (2006.01) E21B 43/12 (2006.01) E21B 43/14 (2006.01)

Patent

CA 2501839

A downhole well valve having a variable area orifice (26) is flow area adjusted by a sliding sleeve (20) that is axially shifted along a tubular housing (12) interior in a finite number of increments. A hydraulic actuator (60) displaces a predetermined volume of hydraulic fluid with each actuator stroke. An actuator displaced volume of fluid shifts the flow control sleeve by one increment of flow area differential. An indexing mechanism (40) associated with the sleeve provides a pressure value respective to each increment in the increment series.

La présente invention concerne une soupape de fond de puits comportant un orifice (26) de surface variable, et dont la surface d'écoulement est ajustée par un manchon coulissant (20) qui se déplace axialement le long de l'intérieur d'un logement (12) tubulaire d'un nombre fini de pas de progression. Un actionneur hydraulique (60) déplace un volume défini de fluide hydraulique à chaque course de l'actionneur. Un volume de fluide déplacé par l'actionneur déplace manchon de régulation de flux d'un pas de progression du différentiel de surface d'écoulement. Un mécanisme de registre (40) associé au manchon donne une valeur de pression caractéristique de chacun des pas de la suite de pas de progression.

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