Title:
DRILLING APPARATUS USED IN GROUND DRILLING
Document Type and Number:
Japanese Patent JPS60164592
Kind Code:
A
Abstract:
A device for use in underground drilling comprising: a tubular housing, a down-hole motor mounted within the housing and having an output shaft, means for connecting said output shaft to a drill bit, means for connecting said housing to a drill string, first and second stabilizers mounted on said housing, said first stabilizer being mounted nearer than the second stabilizer to the output shaft connecting means, at least one of said stabilizers being an eccentric stabilizer, and at least one stress relieving means between the first stabilizer and the means for connecting the housing to the drill string.
Inventors:
RAINERU YURUGENSU
BORUKERU KURIYUGERU
BORUKERU KURIYUGERU
Application Number:
JP1112085A
Publication Date:
August 27, 1985
Filing Date:
January 25, 1985
Export Citation:
Assignee:
CHRISTENSEN INC NORTON
International Classes:
E21B4/00; E21B7/06; E21B7/10; E21B17/10; E21B17/20; (IPC1-7): E21B4/00; E21B17/10
Attorney, Agent or Firm:
Aoki Akira (4 outside)