DETERMINATION OF THE LEAK INTERVAL OF LARGE-DIAMETER CASING STRINGS

Deryaev A.R. Ashirov A. Saduakassov D.S. Tabylganov M.T.
2025 Oil Gas Scientific Research Project Institute

SOCAR Proceedings
2025 Issue 3 70 - 76 pp.

The main causes of damage to the casing strings and excessive metal wear on well fastenings are: incompatibility of selected well designs with geological conditions of well construction; incompatibility of casing calculation methods with actual conditions of their operation in wells. Loss of integrity is characterised by the establishment of a link between the annular space and the wellbore as a result of damage to the column. The casing strings are worn out by the drilling tool to a certain extent. Based on the analysis, casing string damage is common in fields with complex geological and technical drilling conditions. The study is devoted to an urgent issue – determining the leakage interval of casing strings with calculations for estimating heat losses along the borehole during injection of hot liquid. The researcher proposed a fundamentally new method that had not previously been used in Turkmenistan. The essence of the method does not require the restoration of the thermal field after injection due to geotherms, on the contrary, stabilisation of the abnormal temperature is achieved during the injection process. When pumping hot liquid through an unpressurised area, part of the flow goes into the annular space. An area of mixing of hot and cold liquids is formed in the leaky zone, resulting in a temperature contrast. At the leakage level, the temperature difference becomes pronounced and can be detected using appropriate thermometric devices.

buffer , casing string , defect , drilling tool , heated liquid , temperature anomaly

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Scientific Research Institute of Natural Gas of the State Concern «Turkmengas», Ashgabat, Turkmenistan
Academy of Sciences of Turkmenistan, Ashgabat, Turkmenistan
Yessenov Caspian University of Technologies and Engineering, Aktau, Kazakhstan

Scientific Research Institute of Natural Gas of the State Concern «Turkmengas»
Academy of Sciences of Turkmenistan
Yessenov Caspian University of Technologies and Engineering

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