Method of drilling deviated wellbores

Details Method of drilling deviated wellbores Method of drilling deviated wellbores

1986-12-22

1987-10-06

Novosad, Stephen L.

Boring or penetrating the earth

Processes

Boring curved or redirected bores

175 76, 175 94, E21B 708

Patent

active

046976515

ABSTRACT:
Directional drilling is carried out with a rotary drilling tool having a drill string, a drill bit, a drill motor for rotating the drill bit independently of the drill string, an extension sub having both axially contracted and axially extended positions for providing weight to the drill bit when moving from a contracted to an extended position so as to effect a drilling stroke by the drill bit into the wellbore bottom when drilling with the drill bit independently of rotation of the drill string, and a measuring-while-drilling unit acting in conjunction with spiral-bladed stabilizers for effecting proper orientation of the drill bit prior to each drilling stroke.

REFERENCES:
patent: 3587757 (1971-06-01), Herring
patent: 4212359 (1980-07-01), Adcock
patent: 4246975 (1981-01-01), Dellinger
patent: 4431068 (1984-02-01), Dellinger et al.
patent: 4577701 (1986-03-01), Dellinger et al.
W. R. Garrett and H. M. Rollins, Nov. 9, 1964, The Oil and Gas Journal, "New Tool Steers Drill Bit", pp. 194-199.

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