Wellhead isolation tool and method of fracturing a well

Wells – Above ground apparatus – Suspension means

Reexamination Certificate

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Details

C166S088100, C166S097100, C166S095100, C285S123100

Reexamination Certificate

active

07322407

ABSTRACT:
A wellhead assembly is provided including a casing and a tubular member mounted over the casing. A flange extends from the tubular member. A generally elongated annular member is provided in the tubular member. The generally elongated annular member has a first end portion above the tubular member and second end portion below the first end portion. A seal is formed between the second end portion and the tubular member. A hanger may be suspended within the tubular member. In such case, a seal may be formed between the elongate annular member and the hanger.

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Guardian, Casing & Tree Savers, 2000, 3 pages.
ARP/IRP's on-line, 4 pages.
Cameron, Full Bore Time Saving Wellhead Installation Procedure, Surface Wellhead Proposals Publication RP-830, Jun. 19, 2003, Rev. 1, pp. 1-37.
Cooper Oil Tool, W-K-M Wellhead Equipment Catalog 86, article entitled “W-K-M Metal-to-Metal Sealing Tubing Hangers”, © 1994 Cooper Industries, Houston, Texas.

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