FIELD: mining.
SUBSTANCE: bottom hole assembly of a drill hole, comprising a wireless electromagnet telemetric system, which provides for signals transmission via a bottom hole assembly. The telemetric system comprises an insulated gap in the first well tool in the drill hole bottom hole assembly, at least one sensor of magnetic field in the second well tool in the bottom hole assembly of the drill hole, a circuit connected via an insulated gap, which modulates voltage on an insulated gap and magnetic material. At the same time in process of voltage modulation an axial current is developed along the bottom hole assembly of the drill hole, which results in induction of magnetic field near the second well tool. The magnetic material is installed on the outer surface of the second well tool and provides for an induced magnetic field inside the well tool that is not equal to zero. The method to transmit a signal via the bottom-hole assembly consists in the fact that a magnetic material is installed on the outer surface of the bottom hole assembly. Voltage is generated on the insulated gap in the first location in the bottom hole assembly of the drill hole. Voltage generated at the insulated gap is modulated. At the same time the voltage develops axial current along the bottom hole assembly of the drill hole, which induces a magnetic field in the second location inside the bottom hole assembly, which is not equal to zero. The induced magnetic field, which is not equal to zero, is measured in the second location inside the bottom hole assembly of the drill hole.
EFFECT: increased efficiency of signals transfer.
29 cl, 11 dwg
