Wellhead isolation tool

Details Wellhead isolation tool Wellhead isolation tool

1989-11-30

1991-02-12

Dang, Hoang C.

Wells

With below and above ground modification

Above ground actuating means for below ground device

166 77, 166 80, 166196, E21B 2306, E21B 3302

Patent

active

049916505

ABSTRACT:
An improved wellhead isolation tool is presented which includes an expanding nipple operable from outside the wellhead and casing, the nipple and its concentric mandrels being inserted into the wellhead and thus down through the wellhead array and into the casing or tubing by a concentric hydraulic cylinder. The nipple is then expanded and sealed in the casing or tubing by a second concentric hydraulic cylinder. It is then locked in place both mechanically and hydraulically.

REFERENCES:
patent: 2056543 (1936-10-01), Tschappat
patent: 3366181 (1968-01-01), McCall
patent: 3830304 (1974-08-01), Cummins
patent: 4023814 (1977-05-01), Pitts
patent: 4241786 (1980-12-01), Bullen
patent: 4452304 (1984-05-01), Barrier et al.
patent: 4632183 (1986-12-01), McLeod
patent: 4657075 (1987-04-01), McLeod
patent: 4691770 (1987-09-01), McLeod
patent: 4867243 (1989-09-01), Garner et al.

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