Boring or penetrating the earth – Means traveling with tool to constrain tool to bore along... – Normally curved guide or shaft
Patent
1985-07-08
1986-12-16
Novosad, Stephen J.
Boring or penetrating the earth
Means traveling with tool to constrain tool to bore along...
Normally curved guide or shaft
175 61, E21B 708
Patent
active
046290125
ABSTRACT:
An improvement in a drainhole drilling assembly having the usual drilling motor for rotating a drillbit and a drillbit connected with the motor for drilling through the subterranean formations to form a curved borehole penetrating a particular horizontal stratum. The improvement is characterized by a non-rotating, pre-bent, stabilized, curved outer rigid metallic case having in normal repose a first predetermined radius of curvature and a rigid tubular inner metallic shaft journalled for rotation within the curved rigid metallic case and connected with the drilling motor and the drillbit so as to transmit torque from the drilling motor to the drillbit. The rigid metallic shaft is normally straight and is forced interiorly of the curved rigid metallic case to become bent and in the process cause the curved rigid metallic case to have a second predetermined radius of curvature greater that the first predetermined radius of curvature. The rigid inner metallic shaft is forcibly flexed in rotation to transmit the torque from the drilling motor to the drillbit. Also disclosed are specific preferred embodiments having examples illustrating the assembly.
REFERENCES:
patent: 550783 (1895-12-01), Elliott et al.
patent: 2664270 (1953-12-01), Zublin
patent: 2669428 (1954-02-01), Zublin
patent: 2669429 (1954-02-01), Zublin
patent: 3893523 (1975-07-01), Jetter
Atlantic Richfield Company
Bui Thuy M.
Novosad Stephen J.
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