FACILITY FOR CONTROL OVER POSITION OF BOREHOLE OF HORIZONTAL WELL Russian patent published in 2009 - IPC E21B47/02 G01V3/30 

FIELD: mining.

SUBSTANCE: disclosed invention refers to drilling equipment and is designed to control position of borehole of horizontal well between roof and bottom boundary of formation-collector. The facility consists of sensors of gamma-logging (GL) arranged in direct vicinity from a cone bit and orientated at the angle of 180° to each other, of a ferro-probe (FP) installed at the angle of 90° to diametre axis of GL sensors, the said sensors of GL and FP of the facility are arranged in a separate measuring above-cone bit module with a wireless electromagnetic channel of communication and are equipped with an electronic circuit of correlation of FP signals with pulses of GL sensors; the circuit contains a control unit, a switch of pulses of GL sensors, metres of GL pulses, and also a summarising metre of GL pulses; notably, an outlet of a measuring coil of FP is connected to an inlet of the control unit determining polarity of an output signal of FP and connected with the switch; depending on polarity of the outlet signal of FP the switch facilitates switching of channels of GL metres pulses flowing into corresponding metres of GL pulses designated as GL-'top" or GL-"bottom"; their outputs are connected to the summarising metre of GL pulses -"sum", in its turn connected with the measuring circuit of the above-cone bit module.

EFFECT: simplification of design and increased efficiency of control over process of working at horizontal drilling of wells, specifically in thin beds.

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