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SUBSEA SURVEY TECHNOLOGY OF ABANDONED EXPLORATORY WELLS ON THE EXAMPLE OF THE DOLGINSKY OIL FIELD

Development of hydrocarbon deposits on the Arctic coasts and offshore territory is an important and relevant direction of the Oil & Gas industry. A large number of exploratory wells of various types have been drilled in the Russian waters. Some of them were subsequently eliminated or canned. In this regard, one of the most urgent tasks is to study the state of canned or abandoned wells, aimed at ensuring industrial safety, the protection of the subsoil and the environment. In accordance with the requirements of license obligations and regulatory documents of the Russian Federation, it is necessary to monitor the state of liquidated and canned exploratory wells in order to obtain the information on the presence or absence of hydrocarbon leaks from the wells, intercolumn manifestations, griffins, extraneous man-made objects, as well as to assess the background level of the environment state in the area of the wells orifices. The methodology and the main results of the survey of the orifices of liquidated exploratory wells at the Dolginsky oil field located on the continental shelf of the Barents Sea to ensure the industrial safety, protection of the subsoil and the environment of studied region are discussed in the paper. The methodology of the work, which includes navigation and hydrographic support of the work (sonar and magnetometric survey of the seabed), and the main technical parameters of the ship’s instrumentation complex are described. The complex of underwater technical works including a visual inspection of the seabed using a remotely operated underwater vehicle, geoecological testing of environmental components, as well as hydrometeorological studies (determination of hydrochemical indicators of the sea water state, indicators of contamination and physico-chemical parameters of bottom sediments, qualitative and quantitative characteristics of hydrobionts, hydrological observations) is also considered. It is noted that the use of the technologies of underwater survey of abandoned exploratory wells at the example of the Dolginsky oil field allows us to effectively solve the tasks in order to prevent and minimize the consequences of possible natural and man-made disasters.