TOOL MOVEMENT MONITORING SENSOR Russian patent published in 2020 - IPC E21B47/04 G01B7/30 

FIELD: well geophysical survey.

SUBSTANCE: invention relates to the field of geophysical survey of wells and is intended for monitoring the position of the drilling rig tool. Sensor includes a unit of magnets made in the form of two semi-rings, on external perimeter of which uniformly located permanent magnets, and magnetically sensitive head connected by cable to electronics unit. At that, the magnets unit is made in the form of a polymer bracelet, two half-rings of which on one side are movably connected to each other by a connecting element, and on the open ends of the bracelet there is a fastener for fixing them, along the perimeter of the bracelet there is a discrete resilient seal and a spacer made of a polymer material, on the inner perimeter of which there is also a discrete seal, and on the circuit board magnetically sensitive head three solenoids are serially installed, at that for matching of solenoids with constant magnets of the block of magnets longitudinal axes of extreme solenoids are oriented to longitudinal axis of the central solenoid at angle of 10°.

EFFECT: simplified mounting of magnetic modulator on drilling machine winch shaft.

9 cl, 5 dwg