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...
Reexamination Certificate
2004-02-03
2010-02-16
Wright, Giovanna C (Department: 3672)
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...
C175S061000, C175S320000, C285S184000
Reexamination Certificate
active
07661488
ABSTRACT:
A device for drilling controlled directional wells comprises a central hollow element and three hollow tubular elements connected thereto out-of-line with respect to each other. The first hollow tubular element connected by a thread to the spindle and the central hollow element, are each provided with a contact segmental section, thereby forming a pair of contact segmental sections. The sections are disposed on the opposite sides with respect to the meridian plane of the spindle in the bending plane of the drill string and at a distance L between the nearest edges of the contact segmental sections along the central axis of the first element. L≧D, where D is the spindle outer diameter. The contact segmental section of the first element is deviated from the meridian plane of the spindle in the bending plane of the drilling string in an opposite direction with respect to the reaction torque of a drilling bit.
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N. T. Ovchinnikov, Drill String Bottom Assembly at Loading, Gas Industry, Production and Technical Magazine, Feb. 1998, No. 2, pp. 42-44.
Andoskin Vladimir Nikolaevich
Kobelev Konstantin Anatolievich
Timofeev Vladimir Ivanovich
Fitch Even Tabin & Flannery
Obschestvo S Ogranichennoi Otvetstvennostyu'Tirma “Radius
Wright Giovanna C
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