Boring or penetrating the earth – Processes – Boring curved or redirected bores
Patent
1986-12-22
1988-01-19
Novosad, Stephen J.
Boring or penetrating the earth
Processes
Boring curved or redirected bores
175 73, E21B 708
Patent
active
047199776
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 relaxation device for removing any excess weight on the drill bit that would otherwise be detrimental to the direction drilling of a deviated wellbore.
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, "New Tool Steers Drill Bit", The Oil and Gas Journal, Nov. 9, 1964, pp. 194-199.
Gilman Michael G.
Hager Jr. George W.
McKillop Alexander J.
Melius Terry Lee
Mobil Oil Corporation
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