Method for improving cuttings transport during the rotary drilli

Details Method for improving cuttings transport during the rotary drilli Method for improving cuttings transport during the rotary drilli

1987-03-11

1988-07-05

Suchfield, George A.

Boring or penetrating the earth

Processes

Boring curved or redirected bores

175325, E21B 708, E21B 1702

Patent

active

047548193

ABSTRACT:
A wellbore drill string is formed of a plurality of sections of drill pipe interconnected at tool joints with a drill bit at its lower end. A drilling fluid is circulated down the drill string and up the annulus between the wellbore and the drill string. A plurality of annulus reducers located at spaced-apart positions along the drill string impart a cyclical pumping action to the flowing drilling fluid. During drilling, the drill string is axially reciprocated and an extension capability to the drill string maintains continuous weight on the drill bit.

REFERENCES:
patent: 4246975 (1981-01-01), Dellinger
patent: 4361193 (1982-11-01), Gravley
patent: 4368787 (1983-01-01), Messenger
patent: 4373592 (1983-02-01), Dellinger et al.
patent: 4428441 (1984-01-01), Dellinger
patent: 4552230 (1985-11-01), Anderson et al.
patent: 4646855 (1987-03-01), Dellinger

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