APPARATUS AND METHOD UTILISING MULTI-BIT SYMBOL STREAM IN DIRECTIONAL DRILLING SYSTEM Russian patent published in 2020 - IPC E21B47/13 E21B47/24 E21B7/04 

FIELD: soil or rock drilling; mining.

SUBSTANCE: invention relates to drilling of horizontal wells. In particular, disclosed is a system for horizontal drilling, comprising a transmitter for use in conjunction with a horizontal directional drilling system that transmits a multi-bit symbol stream that characterises sensor symbols for receipt by an aboveground portable device. Portable device receives the symbol stream for aboveground recovery of the sensor signals. Transmitter can precisely place the symbol frequencies at least to avoid a noise environment, as well as to avoid powerline harmonics, and can utilise wave shaping for transmitted symbols at least to provide for transmission power control, spectral content control and wideband antenna matching. Receiver can measure the noise environment to identify the symbol frequencies used by the transmitter. Noise can be scanned at an incremental resolution across a wide frequency bandwidth for display or automatic symbol frequency selection.

EFFECT: technical result is to ensure the accuracy of well drilling.

78 cl, 4 tbl, 42 dwg