|국가/구분||United States(US) Patent 등록|
|국제특허분류(IPC7판)||E21B-023/04 E21B-023/00 E21B-034/10 E21B-034/00|
|미국특허분류(USC)||166/375; 166/386; 166/066.5; 166/066.7; 166/332.8|
|발명자 / 주소|
|출원인 / 주소|
|인용정보||피인용 횟수 : 37 인용 특허 : 44|
Apparatus and methods are provided for actuation of downhole tools. In one example, a deep set safety valve uses a magnetic coupling which permits a portion of the safety valve at control line pressure to be isolated from tubing string internal pressure, without requiring the use of a dynamic seal therebetween. A piston of the safety valve may be displaced in response to a differential between control line pressure and pressure in an annulus surrounding the tubing string, pressure in another control line, or pressure in the tubing string. Other types of ...
What is claimed is: 1. A well tool, comprising: an actuator including a piston which displaces in response to a first pressure applied to the piston; an operating member which displaces to operate the well tool, the operating member having a second pressure applied thereto; and a magnetic coupling including at least one first magnet attached to the piston and at least one second magnet attached to the operating member, displacement of the piston being translated into displacement of the operating member while the first and second pressures are isolat...