Experience of Existing Casing Drilling Technologies in Various Conditions and Search of the New Solutions for Actual Challenges

The components of casing drilling technology are evolving and the application area is expanding. Drilling engineers today have more flexibility than ever before to redesign wells and can combine different technologies, materials and equipment to achieve new records in well construction efficiency. In recent years, PJSC Gazpromneft has been constantly using casing drilling technologies. The increasing complexity of geological conditions and the need to reduce well construction costs lead to more efficient solutions. The article presents the actual experience of using the following variations of the casing drilling technology: Non-directional drilling on 426mm casing together with 630mm thermal case at Yamburgskoye field Non-directional drilling on 324mm casing at the Vostochny Section of the Orenburg oil and gas condensate field (VUONGKM) Run in hole with rotation on 245mm casing at VUONGKM. Directional drilling with 245mm casing with a retrievable BHA at VUONGKF. The use of casing drilling technology has not in all the cases under consideration increased the efficiency of well construction, but at the same time the results obtained allow us to predict an additional increase in the efficiency of the application of these technological solutions. At the end of the article, a tree of casing drilling technologies was built and segments with development prospects were highlighted.