Zarubezhneft Group of Companies actively and continuously implements advanced solutions and approaches in the area of well drilling: constant benchmarking is carried out, best practices are studied both in Russia and abroad, and the most modern equipment and technologies are used. The main goal of this activity is to increase the efficiency of processes in order to optimize costs. This effect is especially significant during offshore well construction, the amount of which in Zarubezhneft Group reaches 50 wells per year. In this article the authors consider the experience of using one of these solutions – employment of a semi-submersible mobile offshore drilling unit with a dual derrick on one of the shallow water projects of Zarubezhneft in South-East Asia. Brief information on this issue and an overview of existing projects and concepts of derricks are also submitted. Evaluation of the efficiency of employment of a semi-submersible rig with a dual derrick is confirmed by the actual results given in the article, both in time and financial terms. In conclusion, the authors give conclusions and suggestions on the possibility of further use of this type of derrick when drilling wells at shallow water depths. The information provided in the article reflects only the actual experience of Zarubezhneft Group of Companies and may differ from the experience of using similar equipment by other companies. This is related to the fact that the key success factors in the application of this solution is a qualified offshore drilling unit crew with relevant experience in working with these systems as well as skilled engineering personnel capable of efficient dual derrick operations planning.
References
1. Vadetskiy Yu.V., Burenie neftyanykh i gazovykh skvazhin (Drilling of oil and gas wells), Moscow: Akademiya Publ., 2003, 352 p.
2. Ovchinnikova V.P., Gracheva S.I., Frolova A.A., Spravochnik burovogo mastera (Drillmaster's Handbook), Part II, Moscow: Infra-Inzheneriya Publ., 2006, 608 p.
4.URL: https://www.offshore-mag.com/drilling-completion/article/16758027/advances-in-rig-design
5. Tekhnicheskie sredstva dlya osvoeniya shel'fa Arktiki i zamerzayushchikh morey. Proekty AO “TsKB “Korall” (Technical means for the development of the Arctic shelf and freezing seas. Projects of JSC “CKB “Korall”), Proceedings of V International Arctic Forum “Arktika – territoriya dialoga” (The Arctic is the territory of dialogue), 9–10 April 2019, St. Petersburg, 2019.
