Method of preventing drill string overflow

Details Method of preventing drill string overflow Method of preventing drill string overflow

1981-04-27

1983-07-26

Leppink, James A.

Boring or penetrating the earth

Processes

Boring with specific fluid

E21B 2114

Patent

active

043948804

ABSTRACT:
A method of preventing drilling fluid overflow when adding or removing drill pipe sections to or from a drill string disposed in a well bore comprising the steps of introducing a gas into the drill string until a predetermined volume thereof is introduced therein, introducing drilling fluid into the drill string after introducing the gas until a predetermined volume thereof is introduced therein and the gas is pressurized thereby displacing drilling fluid originally contained in the drill string downwardly within the drill string and upwardly within the annulus between the drill string and the well bore to lower the level of the drilling fluid in the drill string a distance such that upon releasing the introduced pressurized gas and drilling fluid from the drill string and removing drilling fluid and gas therefrom, the resulting level of drilling fluid in the drill string is below the level at which the drill pipe sections are added to or removed from the drill string, releasing the introduced pressurized gas and drilling fluid from the drill string whereby the gas and drilling fluid flow upwardly through the drill string and drilling fluid and gas are removed therefrom, and then adding or removing drill pipe sections to or from the drill string.

REFERENCES:
patent: 2595715 (1952-05-01), Sloan
patent: 2836246 (1958-05-01), Hoch
patent: 3534822 (1970-10-01), Campbell
patent: 3963077 (1976-06-01), Faulkner
patent: 4351400 (1982-09-01), Faulkner

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