OIL AND GAS WELL FLOW STRING WALL THICKNESS EVALUATION
The effectiveness of well logging technologies for the string wall thickness evaluation using both integral and differential type tools has been considered. It has been noted that applying the well logging data processing algorithms based on the correction of the measured values for marker points results in errors of evaluation the actual string wall thickness values. Application of Russian technologies VAD-12 and AST-76 based on sonic resonance techniques allows measuring the actual value of the string wall thickness with a high accuracy and obtaining an objective information about the casing string wear degree and distribution. It has been recommended to include these methods in the standard well logging set used for the technical diagnostics on the wells producing in aggressive hydrogen-sulfi de-containing environments.