West Siberia is the main oil production region of the company.
At the present stage of field development in West Siberia the new unconventional reserves within the low permeable Jurassic and Achimov formations are being actively developed. These reservoir targets are primarily developed by drilling a system of directional wells with further hydraulic fracture operations (HF).
The majority of fields in Russian Federation contain multiple stratified oil reservoirs. In many cases the fluid properties, geological parameters and reservoir pressure conditions are such that each reservoir has to be developed separately, as dictated by legislation. This means additional drilling grids or producing zones consecutively over time using the same wellbore.
Uncertainty is an inherent feature of our understanding of the explored reality. Mathematical models describe our vision of reality in the analytical form and are used to predict oil reservoir production. Model uncertainty is associated with the lack of our knowledge about the reservoir properties.
Mud motors in conjunction with a bent sub have been used for the last 40 years to directionally steer wells to a target location. Mud motor technology is well understood and has seen significant improvement over the years. Rotary Steerable tool technology, on the other hand, is relatively new to the oilfield and improvements are still being made to enhance performance and reliability.
Connectivity is a fundamental but oftentimes elusive characteristic that influences injection and production rates, path of the fluid and field economics. Predicting and measuring connectivity is an important activity for reservoir management. Reservoir simulation is a good tool for connectivity evaluation because of its flexibility. That flexibility, however, comes at a price of time and data needed to develop the geological model and obtain a history match. Several powerful alternatives to simulation exist and we present two here.