Boring or penetrating the earth – Means traveling with tool to constrain tool to bore along... – Sectional guide or shaft having means to lock sections in...
Patent
1987-06-22
1989-05-30
Dang, Hoang C.
Boring or penetrating the earth
Means traveling with tool to constrain tool to bore along...
Sectional guide or shaft having means to lock sections in...
175256, 175321, E21B 708
Patent
active
048341967
ABSTRACT:
A drilling tool having a body that functions as a length of drill string and telescopes to shorten the body each time column load is applied by way of applied bit load. The telescoping action causes a cam turret in the body to change position to cause one of two possible conditions to exist while drilling. In one condition the body centerline is held straight while drilling. In the second condition the lower portion of the body is laterally deflected for changing the course of the well bore while drilling proceeds. Optional features cause a mud pressure signal to be generated, for detection at the surface, when selected elements in the apparatus are in preselected positions.
REFERENCES:
patent: 2197019 (1940-04-01), Monroe
patent: 2536452 (1951-01-01), Leissler
patent: 2680005 (1954-06-01), Storm
patent: 2819039 (1958-01-01), Lindsay et al.
patent: 3131778 (1964-05-01), Emerson et al.
patent: 3457999 (1969-07-01), Massey
patent: 3893523 (1975-07-01), Jeter
patent: 4596294 (1986-06-01), Russell
patent: 4655299 (1987-04-01), Schoeffler
Dang Hoang C.
Jeter John D.
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