GYROSCOPIC INCLINOMETER Russian patent published in 1997 - IPC

FIELD: mining industry. SUBSTANCE: this relates to devices for determining spacious position of bore-hole axis. Gyroscopic inclinometer has ground surface equipment and down hole instrument connected to ground surface equipment by logging cable. Installed in aforesaid instrument is three-degree-of-freedom gyroscope having main axis levelling system. At large zenith angles, performed is changing of gyroscope sensitivity axes to obtain information for determining change of azimuth of deviation plane by means of angle sensor installed along internal axis of gyroscope. Cycle of measuring in mode of large zenith angles is performed at setting outer frame of gyroscope to vertical plane according to information from sensors of apsidal angle and angle of outer frame turning by means of outer frame detent and moment sensor located along outer axis. Transfer of gyroscope to operation at large zenith angles is effected by gyroscope control unit. This resulted in wider potentialities of inclinometer operation in wells with large zenith angles and also in horizontal wells. EFFECT: high efficiency. 1 dwg