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
1981-07-08
1984-04-17
Leppink, James A.
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...
175 61, 175 73, E21B 708
Patent
active
044429088
ABSTRACT:
A drilling tool for deep wells having a motor-driven drill bit which can be turned at an angle to the axis of the primary well hole to produce lateral holes branching from the primary hole. The bit is rotatably-mounted in the last in a series of pivotally articulated links at the downhole end of the drill pipe string. The deviation of the drill bit from the well axis is controlled by pivoting the last link with respect to the penultimate link. The last link includes a sliding surface which bears against the wall of the well hole to effect the pivoting. In another form of the invention a spring effects the pivoting. Preferably stops are provided between the last and penultimate link to limit the angle of pivoting.
REFERENCES:
patent: 2016042 (1935-10-01), Lewis
patent: 2743082 (1956-04-01), Zublin
patent: 2819040 (1958-01-01), James et al.
patent: 2829864 (1958-04-01), Knapp
patent: 3156310 (1964-11-01), Frisby
patent: 4143722 (1979-03-01), Driver
patent: 4185704 (1980-01-01), Nixon
Leppink James A.
Preussag Aktiengesellschaft
Starinsky Michael J.
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