GEOPHYSICAL TELEMETRING SYSTEM TO TRANSMIT HOLE DATA Russian patent published in 2004 - IPC

FIELD: geophysical methods of investigation, transmission of data from downhole instrumentation to ground equipment. SUBSTANCE: geophysical telemetering system includes insulation tubular element separating lower part of drill pipes together with hydroturbine downhole motor from main drill stem, key element controlled by code signal from downhole instrumentation, ground part comprising grounding electrode and unit receiving coded information. Key element is connected in parallel with insulation tubular element. Source of power supply of communication channel and current transformer are inserted into ground part between stem of drill pipes and grounding electrode. Source of power supply of communication channel and primary winding of current transformer are placed in series with stem of drill pipes and additional grounding electrode. Secondary winding of current transformer is connected to input of unit receiving coded information. At least one insulation element with proper key element placed in parallel with additional insulation element controlled by coded signal from downhole instrumentation and separating stem of drill pipes can be installed in stem of drill pipes. EFFECT: enhanced functional reliability, prolonged service life of telemetering system and increased communication range. 2 cl, 3 dwg