METHOD FOR COMPLEX ASSESSMENT OF WELLS CEMENTING QUALITY AND ISOLATION OF RESERVOIR BEDS Russian patent published in 2010 - IPC E21B47/14 

FIELD: oil and gas production.

SUBSTANCE: method includes lowering downhole instrument in well, comprising receiver of noise signals, which is joined in contact with inner surface of casing string with the help of pressing devices or levers - wave guides, registration of radiation intensity change curves in process of lifting, as well as amplitude and time (wave) characteristics of received acoustic signals. Previously distribution of temperature abnormalities is registered along well bore depth with the help of downhole thermometre, intervals of their deviations from geothermy are detected. Change of amplitude-frequency characteristics of registered noise signals in areas of detected temperature abnormalities with open and closed levers - wave guides identifies availability or unavailability of fluids overflow, i.e. specifies quality of reservoirs isolation in borehole annulus.

EFFECT: invention makes it possible to increase validity of well cementing and reservoir beds isolation quality determination.