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US 10,120,098 B2Granted
Downhole device having a toroidal coil with flat metallic strip
AssigneeSchlumberger Technology Corporation
InventorsMartin G. Luling, Mohamed Jaidane
Life of this patent
Estimating the term…
Abstract
A downhole device may include a closed ring of ferromagnetic material mounted on a conductive pipe. The downhole device may also include a first coil spirally wound around the closed ring comprising an electrically conductive flat metallic strip to substantially cover the closed ring.
Claims14
A downhole device comprising:
- a closed ring comprising ferromagnetic material mounted on a conductive pipe;
- and
- a first coil spirally comprising an electrically conductive flat metallic strip wound around the closed ring in a plurality of first windings to substantially cover the closed ring, wherein the electrically conductive flat metallic strip is wound around a direction corresponding to a tangential axis of the closed ring so as to cover alternately an inside face and an outside face of the closed ring.
A logging while drilling system, comprising:
- a first toroidal coil mounted on a drill collar, wherein the first toroidal coil comprises:
- a first closed ring comprising ferromagnetic material;
- and
- a first coil comprising a first electrically conductive flat metallic strip spirally wound around the first closed ring in a plurality of windings to substantially cover the first closed ring wherein the first coil is wound around a direction corresponding to a tangential axis of the closed ring so as to cover alternately an inside face and an outside face of the closed ring,
- wherein the first toroidal coil operates as a receiver to detect a magnetic field from an electric current flowing axially along the drill collar;
- and
- a processor configured to:
- collect data from the toroidal coil;
- and
- derive an electrical resistivity of a geological formation from the data.
7 more elements
Dependencies are inferred from the claim text.