METHOD AND DEVICE TO DETERMINE TYPE OF MATERIAL IN CAVITY BETWEEN INNER METAL WALL AND OUTER METAL WALL Russian patent published in 2015 - IPC E21B47/05 

FIELD: measurement equipment.

SUBSTANCE: invention relates to monitoring and inspection of quality or level of cementation in a well. The method is proposed to determine type of material in a cavity between an inner metal wall and an outer metal wall, where the following sequence of actions is realised. at first at the inner side of the inner metal wall they install an instrument, which comprises a pulse generator and a signal recorder; then by means of the pulse generator they generate electromagnetic pulses of low duration, which cause mechanical vibrations in walls; data characterising reflections of these mechanical vibrations from the cavity created between the specified walls is recorded by means of the signal recorder; recorded data is analysed to determine type of material in the cavity. Also the device is proposed for realisation of this method.

EFFECT: increased accuracy and information value of measurements, which will make it possible for an operator to predict functional service life of a well and guarantee integrity of its structure.

16 cl, 6 dwg