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Complications in the drilling of wells projected to VIII horizon of Bulla-deniz field and the measures towards their elimination

The paper reviews the main reasons for the failures and complications with further specific recommendations for completing the well to the project depth in Bulla-deniz field. The practicability of the application of water-based drilling muds characterized with the wall-plastering and managed structural-rheological properties instead of the hydrocarbon-based drilling mud to the 2700 m. It is recommended to use hydrocarbon-based drilling mud only in the revelation of production horizon via drilling. Regardless of the drilling mud’s type and properties, the time of the tool remaining stationary while drilling and round trip operations should not exceed 3-5 minutes. In order to avoid the loss of the drilling mud into the formation, the casing of production string in consolidated clay rock is recommended.