FIELD: oil and gas production industry. SUBSTANCE: device can be used in geophysical investigations of oil and gas wells. Used in function of device is casing pipe for strengthening of well. It is made in the form of main pipe and housing which is installed externally and concentrically with respect to main pipe with creation of hermetic circular space filled with gas. Application of aforesaid embodiment of device allows for obtaining reliable data about quality of cementation of casing string lowered into well. EFFECT: higher efficiency. 4 dwg
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