E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 31/113 (2006.01)
Patent
CA 2604029
The present invention relates to a means and method for providing hydraulic load compensated time delay in downhole well operations. The means according to the invention is characterized in that it includes a piston stem (1) enclosed by a piston housing (2), wherein the means is adapted in such a manner that an axial force, acting either in the direction of stretch or in the direction of compression, causes a pressure buildup in one of two hydraulic chambers (3, 4) which are each filled with an incompressible liquid and which are mutually connected through one or more throttle orifices (8), wherein a sideways floating, supported piston sleeve (5) is arranged between the piston stem (1 ) and the piston housing (2), wherein the piston sleeve (5) is adapted to control the differential pressure across the throttle orifice(s) (8) in such a manner that an increasing axial force acting on the means will, in a predetermined manner, increase the differential pressure across the throttle orifice(s) and hence delay the flow-through of the incompressible liquid from one of the to hydraulic chambers (3, 4) to the second chamber (4, 3), which also causes a predetermined delay of the relative movement between the piston stem (1) and the piston housing (2).
La présente invention concerne un moyen et un procédé pour fournir un retard compensé en charge hydraulique dans des opérations de puits de fond de trou. Le moyen selon l~invention est caractérisé en ce qu~il comprend une tige de piston (1) enfermée par un logement de piston (2), le moyen étant adapté de telle manière qu~une force axiale, agissant soit dans la direction d~étirement soit dans la direction de compression, entraîne une accumulation de pression dans une de deux chambres hydraulique (3, 4) qui sont chacune remplies avec un liquide incompressible et qui sont mutuellement raccordées par l'intermédiaire d~un ou plusieurs orifices d~étranglement (8), un manchon de piston supporté flottant latéralement (5) étant agencé entre la tige de piston (1) et le logement de piston (2), le manchon de piston (5) étant adapté pour contrôler la pression différentielle à travers le ou les orifice(s) d~étranglement (8) de manière telle qu~une force axiale de plus en plus importante agissant sur le moyen augmentera, de manière prédéterminée, la pression différentielle à travers le ou les orifice(s) d~étranglement et donc retardera le débit du liquide incompressible d~une première des deux chambres hydrauliques (3, 4) à la seconde chambre (4, 3), qui entraîne également un délai prédéterminé du mouvement relatif entre la tige de piston (1) et le logement de piston (2).
Smart & Biggar
Well Innovation As
LandOfFree
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