Air lift system for large diameter borehole drilling

Details Air lift system for large diameter borehole drilling Air lift system for large diameter borehole drilling

1977-06-22

1979-01-16

Purser, Ernest R.

Boring or penetrating the earth

Enlargement of existing pilot throughbore requiring...

175213, 175324, E21C 2300

Patent

active

041344634

ABSTRACT:
An air lift system for large diameter borehole drilling is disclosed. The system is applicable in drilling operations where a vertical pilot hole is drilled below the point to which the borehole will later be enlarged and a slant hole is drilled obliquely to intersect the pilot hole near its nether position. During the drilling operation, the circulation system pumps drilling fluid down the annulus of the borehole to cool the cutterhead and to mix with the cuttings. The drilling fluid carrying the cuttings then moves down the pilot hole and up through the slant hole. A plenum is located in the slant hole to assist in the lifting of the drilling fluid. The plenum includes a tapered transition pipe, a tapered discharge horn, and an air diffusion ring located at the throat of the discharge horn. The diffusion ring is utilized to inject outside air into the drilling fluid passing therethrough. The discharge horn is shaped to enable the discharge velocity of the drilling fluid passing through the discharge horn to be constant over the entire length thereof.

REFERENCES:
patent: 1604644 (1926-10-01), Heyser
patent: 1760240 (1930-05-01), Loomis
patent: 2062799 (1936-12-01), Scott
patent: 2537605 (1951-01-01), Sewell
patent: 2849213 (1958-08-01), Failing
patent: 3077358 (1963-02-01), Costa
patent: 3208537 (1965-09-01), Scarborough
patent: 3385382 (1968-05-01), Canalizo et al.

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