Method of preventing well bore drilling fluid overflow and forma

Details Method of preventing well bore drilling fluid overflow and forma Method of preventing well bore drilling fluid overflow and forma

1975-06-18

1976-06-15

Purser, Ernest R.

Wells

Valves, closures or changeable restrictors

175 25, E21B 2300

Patent

active

039630773

ABSTRACT:
The present invention relates to a method of preventing drilling fluid overflow and uncontrolled formation fluid blowouts when removing drill pipe sections from a drill string disposed in a well bore which penetrates a subterranean formation and is filled with drilling fluid. A gas is introduced into the annulus until a predetermined gas pressure is reached therewithin thereby displacing drilling fluid from the well bore and downwardly in the annulus a distance such that upon releasing the gas pressure from the annulus the level of drilling fluid in the drill string is below the level at which the drill pipe sections are disconnected therefrom, but above the level at which the hydrostatic head exerted on the formation by the drilling fluid equals the pressure of fluids contained within the formation. The gas pressure is released from the annulus and a predetermined number of drill pipe sections are removed from the drill string whereby the level of drilling fluid in the well bore is prevented from reaching the level at which the hydrostatic head exerted on the formation by the drilling fluid is below the pressure of the formation fluids. The annulus is refilled with drilling fluid and the foregoing steps repeated until a desired number of drill pipe sections are removed from the drill string.

REFERENCES:
patent: 2832566 (1958-04-01), Bielstein
patent: 3384178 (1968-05-01), Agnew et al.
patent: 3613806 (1971-10-01), Malott
patent: 3638485 (1972-02-01), Knauth
patent: 3646808 (1972-03-01), Leonard
patent: 3729986 (1973-05-01), Leonard
patent: 3889959 (1975-06-01), Persson

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