VISUAL METHOD OF INVESTIGATION OF KIND OF DAMAGE TO WALLS OF CASING STRING OF WELL, AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2015 - IPC E21B47/02 E21B47/107 

FIELD: oil and gas industry.

SUBSTANCE: method consists in pulse lighting and recording of walls of a casing string of a well by means of a pulse light source and a picture telecamera with further processing of the obtained video materials, as per which place and nature of damage to the wall of the well casing string is determined. Before visual investigations are performed, acoustic investigations of intensity of noise emission are performed as to depth and azimuthal angle of the well by means of a point-directed transducer of intensity of noise emission with a directivity pattern coinciding as to direction with the directivity pattern of the pulse light source. With that, recording of walls of the well casing string by means of the picture telecamera is performed when an output signal from the transducer of intensity of noise emission exceeds the specified threshold value.

EFFECT: improving performance of search of location places of damages to a casing string.

5 cl, 1 dwg