Wellhead isolation tool

Details Wellhead isolation tool Wellhead isolation tool

1977-03-14

1978-09-05

Purser, Ernest R.

Wells

Above ground apparatus

Inner member anchor or seal with valve

166 70, 166 90, E21B 3303, E21B 4304, E21B 43118

Patent

active

041112610

ABSTRACT:
Improved apparatus for isolating a production tubing string in an oil well from the control head whereby pressures higher than the pressure of the control head may be applied through the production tubing string to the producing formation. The apparatus utilizes an outer housing with a telescoping inner mandrel and seals therebetween, with the outer housing being adapted for connection to the control head and the inner mandrel being capable of moving into the control head to make a fluid-tight sealed connection with the production tubing thereby isolating the control head from the higher pressure being applied through the tubing into the formation. The improved apparatus further provides an elongated divergent passage at the lower end of the telescoping inner mandrel for providing a gradual increase in cross-sectional area between the interior of the telescoping inner mandrel and the interior of the upper end portion of the production tubing string to reduce turbulence in high pressure fluid passing downwardly therethrough and thereby reduce to a minimum the incidence of erosion of the inner surface of the tubing string adjacent to the sealed connection between the inner mandrel and the tubing string.

REFERENCES:
patent: 1252426 (1918-01-01), Gnade
patent: 2672199 (1954-03-01), McKenna
patent: 2868512 (1959-01-01), Sease
patent: 3469642 (1969-09-01), Goodwin et al.
patent: 3620457 (1971-11-01), Pearson
patent: 3830814 (1974-08-01), Cummins
patent: 3905553 (1975-09-01), Bradley et al.
patent: 4023814 (1977-05-01), Pitts

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