Annular and concentric flow wellhead isolation tool

Details Annular and concentric flow wellhead isolation tool Annular and concentric flow wellhead isolation tool

1989-09-27

1991-05-07

Neuder, William P.

Wells

Above ground apparatus

With means for inserting fluid into well

166 95, E21B 3303

Patent

active

050128655

ABSTRACT:
Apparatus for isolating the wellhead equipment from the high pressure fluids pumped down to the producing formation during the procedures of fracturing and acidizing oil and gas wells utilizes a central mandrel concentric inside an outer mandrel and an expandable sealing nipple to seal the outer mandrel against the casing. The sealing nipple is provided with passageways to allow fluids to be pumped down the tubing and/or the annulus between the tubing and the casing in an oil or gas well.

REFERENCES:
patent: 3830304 (1974-08-01), Cummins
patent: 4169504 (1979-10-01), Scott
patent: 4657075 (1987-04-01), McLeod
patent: 4691770 (1987-09-01), McLeod
patent: 4867243 (1989-09-01), Garner et al.

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