Application of Multilateral Wells at Taas-yuryakh Neftegazodobycha LLC. Perspectives for Fields of Eastern Siberia

The Srednebotuobinskoye oil and gas condensate field is one of the largest deposits in Eastern Siberia (RF). The structure of this field is characterized by the presence of an extensive gas cap,oil rim and underlying plantar water. Analysis of early production data showed the main difficulties associated with the development of reservoirs with contact reserves - gas-cone formation and early breakthrough of gas to the bottom of producing wells with low oil withdrawals. In this regard, Taas-Yuryakh Neftegazodobycha LLC has been actively developing new technologies for drilling and the exploitation of this large and complex field. This involves the construction of particularly long horizontal multiple laterls and operation of wells with a low depression.

This article presents results of construction and operation of multilateral wells. In 2017, the company drilled 3 multilateral well pilots with "fishbone" geometry. Among the subsidiaries of Rosneft Oil Company, leading the development of onshore fields, a record result has been achieved with 5,030 m penetration of the reservoir. The assessment of multilateral well production shows a 3.5-fold increase compared to standard horizontal wells.

To date, the first phase of pilot operation has been implemented:

1. Selection of pilot sites, well design;
2. Drilling wells with the selection of optimal technologies and determination of technological limits;
3. Selection of pilot sites, well design;
4. Evaluation of the actual productivity of MZS;
5. Research of working intervals.

These works allow to drill high-performance multi-hole wells with high economic efficiency. The experience of our company in the construction of multilateral wells will allow us to make a more balanced decision in the dissemination of this technology at fields with similar geological and technical conditions.