Jerry K. Boyd - Tomball TX Yu C. Chang - Houston TX
Assignee:
FIP, Inc. - Houston TX
International Classification:
E21B 2300 E21B 3303
US Classification:
166 88
Abstract:
There are disclosed several alternate embodiments of wellhead apparatus of the type in which hydraulic fluid may be transmitted to and/or from a subsurface safety valve or other hydraulically operable device within the well through an annular space formed between the production tubing.