Мінеральні ресурси України (Nov 2021)
Historical aspects of drilling of oil and gas wells – from project to practice (look from the past in the future)
Abstract
The article covers the history of deep oil and gas wells drilling in Ukraine during the last century. Particular attention is paid to the drilling of ultra-deep vertical wells with a depth of more than 6000 meters, and the drilling of branched-horizontal wells onshore and offshore. According to the authors, drilling projects for production wells should consist of two parts, the first one provides the maximum rate of penetration and the second one provides the high-quality opening of production intervals. When implementing these parts of the project, it is recommended to use a service system for certain types of operation. First of all, it concerns control of drilling mud properties, wall fixing processes, recovery of filtration characteristics for reservoir formations. In order to study the subsoil using the latest drilling technologies, it would be appropriate to revise the geological information on drilling of the deepest well in Ukraine, Shevchenkovo-1, and design a new analogue with a comparable depth. The article describes the unique local experience of deviated and horizontal wells drilling at Odesa gas condensate field on the Black Sea offshore by pressure control during formation drilling. The authors propose to carry out the opening formation following the technology which allows reducing the pressure during the well production with the cone of depression. The technology has passed industrial testing. The gained experience can be applied during the drilling of other Black Sea deposits. According to the authors, the government should increase funding for scientific and technical programs and measures to stabilize and increase production of these minerals by drilling new deep wells, restoring the stock of suspended wells and intensifying wells in depleted fields.
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