EP 1930540 A1 20080611 - Low power miniature hydraulic actuator
Title (en)
Low power miniature hydraulic actuator
Title (de)
Sparsames hydraulisches Miniaturbetätigungsglied
Title (fr)
Actionneur hydraulique miniature à faible puissance
Publication
Application
Priority
EP 00978303 A 20001031
Abstract (en)
Electrohydraulic actuators and associated methods are utilized to control the operation of downhole well tool assemblies, representatively flow control devices. In a described embodiment thereof, each actuator (36) is positioned downhole and comprises a self-contained, closed circuit hydraulic system including an electrically operable double action primary pump (58) drivingly coupled to an associated well tool assembly (36) via a first hydraulic circuit, and an electrically operable switching pump (60) coupled to the first hydraulic circuit via a second hydraulic circuit interposed therein and operative to selectively alter the control flow of hydraulic fluid to the well tool assembly in a manner reversing its operation. To provide for selective, more rapid control of the well tool assembly, a chargeable accumulator (108) is connected to the hydraulic circuitry and is selectively and drivably communicatable with the well tool assembly.
IPC 8 full level
E21B 41/00 (2006.01); E21B 43/12 (2006.01)
CPC (source: EP US)
E21B 23/0423 (2020.05 - EP US); E21B 43/12 (2013.01 - EP)
Citation (applicant)
- EP 0898084 A1 19990224 - CATERPILLAR MITSUBISHI LTD [JP]
- US 2240901 A 19410506 - WALTER FERRIS
- US 4428422 A 19840131 - LAURENT JEAN [FR]
Citation (search report)
- [XY] US 4428422 A 19840131 - LAURENT JEAN [FR]
- [Y] US 3677081 A 19720718 - NEWTON GEORGE R, et al
- [Y] US 2646062 A 19530721 - NIXON JEDDY D
- [A] US 4287946 A 19810908 - BRIEGER EMMET F
Designated contracting state (EPC)
DE FR GB NL
DOCDB simple family (publication)
DOCDB simple family (application)
EP 07122479 A 20001031