Boring or penetrating the earth – With signaling – indicating – testing or measuring – Tool position direction or inclination measuring or...
Patent
1991-11-05
1993-07-27
Dang, Hoang C.
Boring or penetrating the earth
With signaling, indicating, testing or measuring
Tool position direction or inclination measuring or...
175 50, 175 61, 324346, E21B 704, E21B 47022, E21B 4709
Patent
active
052303870
ABSTRACT:
A bidirectional drilling downhole steering and survey tool for detecting ferromagnetic bodies from an off vertical borehole, transmitting the signals from the downhole sensors to surface equipment while drilling, and for calculation of the range and direction to the detected ferromagnetic body for the use of the directional driller in intercepting or avoiding the ferromagnetic body. In combination with the steering and range and direction to ferromagnetic body capabilities, the downhole tool may also include sensors for detecting formation bed interface, apparatus for electric or gamma ray or radioactive logging, neutron density sensor apparatus and other formation evaluation or correlation apparatus. The downhole tools may be packaged, in either an electric line transmitted tool of MWD transmitted tool.
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Clark Howard C.
Fitzgerald Don D.
Roberts George F.
Stelly, II Otis V.
Walters Philip H.
Dang Hoang C.
Magrange, Inc.
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