Well head retriever tool and method

Details Well head retriever tool and method Well head retriever tool and method

1977-09-23

1979-05-08

Purser, Ernest R.

Wells

Valves, closures or changeable restrictors

166 85, E21B 3303

Patent

active

041531116

ABSTRACT:
A tool and accessories for use in a method of removing a shooting valve, or blow-out preventer from a well having pressure therein, without killing the well. The tool has a mandrel with a well head plug on one end that matches a casing head fixture. The mandrel is long enough to extend through the shooting valve, or blow-out preventer when the plug is in place in the casing head fixture. And, there is a pressure tight housing which can receive the mandrel and plug inside the housing. When the housing has been attached to the shooting valve, or blow-out preventer, the pressure in the housing may be equalized with the well pressure, and then the plug can fall into place and be secured there. Thereafter, the housing pressure will be released and the shooting valve, or blow-out preventer can be removed while the well pressure is contained by the plug.

REFERENCES:
patent: 2148327 (1939-02-01), Smith et al.
patent: 2180680 (1939-11-01), Hild
patent: 2241288 (1941-05-01), Yancey
patent: 2241333 (1941-05-01), Smith
patent: 2358677 (1944-09-01), Yancey
patent: 3830304 (1974-08-01), Cummins
patent: 3924686 (1975-12-01), Arnold

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