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Wellhead apparatus
| Details |
Inventors: Boyd, Jerry K.; Chang, Yu C.;
Assignee: FIP, Inc. (Houston, TX)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
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. |
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DETAILED DESCRIPTION The invention having been described, what is claimed is: 1.
Wellhead apparatus, comprising a tubing head adapted to be mounted on a casing head, said head having a bore therethrough with a seat in the bore, an adapter adapted to be mounted on and releasably connected to the tubing head, said adapter having a bore therethough whose lower end is aligned with the bore of the tubing head above the seat, when so connected, a coupling disposable within the bore of the adapter, said coupling having a bore therethrough which is aligned with the upper end of the bore of the adapter, when so disposed, a casing suspended from the coupling in alignment with the coupling bore and extending therefrom within the tubing head, a tubing suspended from the coupling within the casing in alignment with the coupling bore and extending therefrom below the casing and spaced therefrom to provide an annular space therebetween, an assembly adapted to be disposed about the casing and supported on the seat in the bore of the head for sealing between the casing and the head, said adapter having an opening into its bore for connection with an external source of hydraulic fluid, means including seal means about the bore of the adapter for sealing between the adapter and the coupling and a port in the coupling for connecting the opening with the annular space, and means for transmitting hydraulic fluid through said space to and from hydraulically operable means within the well, said coupling having a groove thereabout, and said adapter having a plurality of supporting dogs mounted thereon for movement into and out of the groove, whereby with the dogs in the groove, and the adapter released from the tubing head, the coupling is supported from the adapter to permit the casing and tubing strings to be raised therewith.
2.
Wellhead apparatus of the character defined in claim 1, wherein the upper ends of the groove and dogs have inwardly and upwardly tapered surfaces to prevent retraction of the dogs when the coupling is supported therefrom
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