Baker Hughes Oilfield Operations LLC

Nikolay Nikolaevich Velker

Thomas Kruspe

Andreas Hartmann

Martin Folberth

Alexander Sergeevich Vershinin

Alexey Vladimirovich Bondarenko

Yuliy Aleksandrovich Dashevskiy

Jens Behnsen

Sven-Hendrik Lampe

David Sergeevich Vlasov

Alexander S Vershinin

A downhole antenna tool is disclosed for downhole well-logging or other downhole operations. Antenna bars are provided for winding of coils through associated coil carriers of individual ones of the antenna bars. The antenna bars with the wound coils are coated with a protection layer and are releasably coupled to a substrate of the downhole antenna tool using, for example, a silicone cushion layer.

Downhole bar antenna with distributed windings

Wellbore ranging methods and systems for active electromagnetic ranging between a pair of conductive tubulars. Methods may include generating a depth-dependent current on one conductive tubular of the pair and a return current on another and thereby causing an injection current to flow into the earth formation by electrically exciting a first conductive tubular of the pair at a first wellhead and a second of the pair at a second wellhead, wherein the return current on the one results from the injection current on the other and is received from the earth formation; making electromagnetic measurements indicative of at least one electromagnetic field resulting from the depth-dependent current in the earth formation; and estimating a relative position of the first conductive tubular with respect to the second tubular using the electromagnetic measurements.

Active magnetic ranging by wellhead current injection

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Novosibirsk, Russia

Nikolay Nikolaevich Velker