DEVICE TO OBSERVE DRILLING HOLE WALLS Russian patent published in 2010 - IPC E21B47/00 E21B49/00 

FIELD: oil-and-gas industry.

SUBSTANCE: invention relates to field-geophysical analysis and can be used for visual control of well walls. Proposed device comprises TV camera with TV receiver interconnected via cable that moves up and down the well driven by special device arranged on top circular platform arranged to rotate in horizontal plane on bottom circular platform and aligned with it. Bottom platform is arranged aligned with the well and rigidly fixed at its mouth. Bottom circular platform upper surface accommodates reversing motor coupled via reduction gear with top circular platform and, via its control input, with reversing motor control unit. TV camera carries light source and laser radiator directed towards well mouth and furnished with optical adapter to transform laser beam projection point into light line passing along bottom circular platform radius to central photo receiver arranged on bottom circular platform edge. LH and RH photo receivers are arranged in symmetry with central photo receiver of the right and left of it. Said receivers are connected to appropriate inputs of control unit that control sense of rotation of aforesaid motor.

EFFECT: constant orientation of produced well wall image with respect to cardinal points.

2 dwg