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|국가/구분||United States(US) Patent 등록|
|국제특허분류(IPC7판)||E21B-034/06 E21B-034/16 G01V-001/40|
|미국특허분류(USC)||166/386 ; 166/664 ; 166/332 ; 251/12915|
|발명자 / 주소|
|출원인 / 주소|
|인용정보||피인용 횟수 : 44 인용 특허 : 8|
A downhole safety valve for a subterranean well comprises an axially shiftable valve head which is movable between open and closed positions by an actuating member. The actuating member is axially shifted by a device mechanism which is manipulated by an electric motor. The electric motor is preferably actuated by downhole batteries and the energization and de-energization of the electric motor is preferably controlled from the well surface by electromagnetic waves. A locking mechanism engages the actuating member of the safety valve in its open position ...
Apparatus for shifting a downhole tool axially shiftably mounted in a subterranean well conduit for movement between an initial and a second position comprising, in combination: an axially extending actuator connected at one end to said downhole tool; resilient means opposing axial movement of said actuator in the direction away from said initial position; peripheral abutment means on said actuator; shifting means disposed adjacent said actuator; an axial force transmitting member in operative engagement with said shifting means; means for mounting said ...