E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 47/12 (2006.01) E21B 47/01 (2006.01)
Patent
CA 2334525
A downhole tool includes a steerable antenna that locates a formation deployed remote sensing unit, powers the remote sensing unit and retrieves formation data collected by the remote sensing unit. Electronics for operating the steerable antenna and for performing these operations are also contained within the downhole tool. The steerable antenna includes a plurality of coils. By selectively controlling the magnitude of the electrical signal provided to each of the coils, or by selectively amplifying the signal produced by each of the coils, a composite antenna radiation pattern maximum may be produced at any direction with respect to the downhole tool. The steerable antenna may include an orthonormal coil set or another coil set which allows the antenna radiation pattern maximum to be controlled. Further, multiple steerable antennas may be formed that work in cooperation with one another. The steerable antenna may be employed to locate a remote sensing unit within the formation, to power the remote sensing unit and to retrieve data from the remote sensing unit, all according to the present invention.
Baker Steven D.
Blaickner Alfred
Homan Dean M.
Schlumberger Canada Limited
Smart & Biggar
LandOfFree
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