DEVICE FOR LOGGING ELECTRO-MAGNETIC SCANNING PROBING Russian patent published in 2011 - IPC G01V3/28 

FIELD: oil and gas production.

SUBSTANCE: device consists of k of rotating three-element various depth probes. Each probe consists of the nearest and distant receiving generator coils, of k generators of working frequencies, of a k-channel amplifying-converting unit, of a unit for data processing, of a control unit, of a unit of space orientation, of a telemetry unit, of an electric drive, of a receiving electro-insulating rod with receiving coils arranged thereon, of 1…k generator electro-insulating rods with generator coils arranged thereon, of a sensor of angular velocity of rotation of the receiving rod, of a stabiliser of its frequency and of a synchronisation unit. The synchronisation unit includes a sensor of receiving coils position, a control signal shaper and 1…k actuating devices. Magnetic moments of the generator and receiving coils are perpendicular to axes of probes. The shaft of the electric drive is mechanically tied with the receiving electro-insulating rod. Shafts 1…k of the actuating devices of the synchronising unit are mechanically tied with 1…k generator rods correspondingly.

EFFECT: raised reliability of borehole measurements and expanded functionality.

5 cl, 14 dwg