专利名称：Assembly for directional drilling of
boreholes
发明人：Abe Steiginga,Robert N. Worrall申请号：US07/147402申请日：19880125公开号：US04880066A公开日：19891114
摘要：A directional drilling assembly comprises a downhole drilling motor andstabilizer assembly which stabilizes the drilling assembly in such a manner in theborehole that the drilling bit driven by the output shaft of the downhole motor has atilted orientation in the borehole. The stabilizer assembly comprises a lowermoststabilizer which is connected to the output shaft of the motor so as to suppress anysticking tendency of said lowermost stabilizer to the borehole wall.
申请人：SHELL OIL COMPANY
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