Boring or penetrating the earth – Processes – Boring with specific fluid
Patent
1989-08-07
1991-09-17
Kisliuk, Bruce M.
Boring or penetrating the earth
Processes
Boring with specific fluid
175 69, 175 72, E21B 2100, E21C 700
Patent
active
050486209
ABSTRACT:
An apparatus for air rotary drilling in saturated unconsolidated deposits. It consists of a drill rod connected to a drill bit and a drill casing surrounding the drill rod which defines a well in a drilled region. A pressurized air source is connected to the drill rod, the drill rod having a bore for supplying air under pressure to the drill bit, to force air and material up the drill casing in an area defined between the drill rod and the drill casing. A rotary drive arrangement drives the drill rod in rotation to provide a drilling action in cooperation with the high pressure air, the high pressure air source providing high pressure air to the drill rod bore. A snorkel discharge arrangement discharges air and material from the space defined between the drill pipe and the drill rod. A pressure control arrangement is provided for sealing the space between the drill pipe and the drill rod upon termination of forced high pressure air into the drill rod bore and successively lowers the pressure in the space between the drill rod and the drill pipe at a predetermined rate to avoid heave.
REFERENCES:
patent: 2786652 (1957-03-01), Wells
patent: 3495664 (1970-02-01), Kelly
patent: 4315553 (1982-02-01), Stallings
Oil and Gas Journal-Sep. 6, 1954, Hassebroek et al.-pp. 109-112.
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