Western Siberia is Rosneft’s key hydrocarbon-producing region accounting for 161 mmtoe of hydrocarbons or 63% of the Company's production. In 2020, the liquid hydrocarbon production exceeded 125 mmt. The Company’s key producing assets in Western Siberia include RN-Yuganskneftegaz (27% of Rosneft's total hydrocarbon production), Samotlorneftegaz (9%), and RN-Uvatneftegaz (4%).
To enhance oil recovery at its fields in Western Siberia, the Company monitors and streamlines its existing development systems by switching from conventional directional wells to MSHF HWs. This technology significantly boosts the well productivity rate and the scope of reserves under development, while also reducing the well stock and enhancing the project economics. The Company massively leverages MSHF HWs at its mature assets in Western Siberia.
New projects are also underway, with the Erginsky cluster and the Russkoye field standing out as the largest plays.
Western Siberia is the largest gas-producing region, with 44 bcm extracted in 2020.
RN-Yuganskneftegaz is the Company’s largest asset. The bulk of proved reserves (80%) are concentrated in the Priobskoye, Prirazlomnoye, Mamontovskoye and Malobalykskoye fields.
Taking into consideration the production restrictions set by the new OPEC+ agreement, RN-Yuganskneftegaz produced 69 mmtoe, including 65 mmt of liquid hydrocarbons. RN-Yuganskneftegaz ensures stable production both by drilling new wells and performing well interventions for incremental oil production and by maintaining and recovering its basic production.
In August 2020, RN-Yuganskneftegaz set a new record in commercial drilling of two-string horizontal wells – 15,700 m per rig, up by 47% compared to 2015.
In October 2020, the company set a new industry record in daily drilling – 27,542 m, which is 414 m per day higher than the previous record dated July 2017. The new milestone was achieved with fewer rigs and a 6% increase in efficiency. The company is committed to minimising downtime – 24/7 monitoring and control of the construction of each well reduce downtime to zero and ensure a high level of safety.
The initial flow rate of newly commissioned wells reached 89.6 t per day (up 18.8% year-on-year), while the average flow rate increased by 25.5% year-on-year, reaching 48.9 t per day.
In October 2020, RN-Yuganskneftegaz performed a record 600 hydraulic fracturing operations. The annual number of such operations is about five thousand. To expand the pay zone coverage, the company uses up to 20 stages of MSHF, including in the horizontal sections of wells. Hydraulic fracturing allows the company to reach and effectively produce the reserves from ultralow-permeability reservoirs. The operations are fully designed in RN-GRID, the first Russian hydraulic fracturing simulator. The use of proprietary simulator put an end to Rosneft’s reliance on foreign software for for hydraulic fracturing modelling.
The efficiency of well interventions for recovered production increased by 20%, from 1.23 kt to 1.48 kt per well, mainly due to optimised production and clearing of the bottom-hole zone.
In accordance with Federal Law No. 340-FZ on Introducing Incentives for the Priobsky licence area dated 15 October 2020, on 28 January 2021 the Company entered into an investment agreement with the Ministry of Finance of the Russian Federation and the Ministry of Natural Resources and Environment of the Russian Federation to stimulate oil production in the Priobsky licence area. MET tax deduction for the Priobsky licence area in the amount of RUB 460 bln starting 1 January 2021 will serve as a source of additional investments in developing oil production in the area and will ensure incremental production of more than 70 mmt in 2021–2030.
Over 98% of Samotlorneftegaz’s proved reserves are concentrated within the Samotlor field, one of the largest in the world. Commercial production at the Samotlor field began in 1969 and peaked at over 150 mmtpa in the 1980s.
In 2020, the company produced 23 mmtoe of hydrocarbons, including over 18 mmt of liquid hydrocarbons.
The Samotlor field relies on government support to continue drilling new wells and performing well interventions. Incremental production of oil and gas condensate at Samotlorneftegaz achieved through the drilling of new wells grew to 1.2 mmt (up 5.5% year-on-year), while the number of commissioned wells reached 406. Production from well interventions (excluding drilling) increased to 0.67 kt per well (up 7.1 % year-on-year), mainly due to more efficient transitions and reaching other formations.
The bulk of proved reserves (ca. 70%) at RN-Uvatneftegaz are concentrated in the Ust-Tegusskoye, Zapadno-Epasskoye, Urnenskoye, Severo-Tyamkinskoye, Severo-Tamarginskoye and Protozanovskoye fields, which are being developed as part of the Eastern Development Centre.
In 2020, RN-Uvatneftegaz produced 9.4 mmtoe of hydrocarbons, including 9.2 mmt of liquid hydrocarbons. It commissioned 83 new wells (up 5% year-on-year), resulting in 1.04 mmt of incremental production (up 48 kt vs 2019). It also launched 2.6 times as many wells after sidetracking operations, with incremental production rising to 4,240 t per well, or 3.5x vs 2019.
RN-Uvatneftegaz is introducing new technology aimed at boosting production, gaining access to commercially recoverable reserves and cutting unit costs. In terms of reducing operating costs, the company successfully completed hydraulic fracturing tests in injection wells using the silica sand-enabled Salik service based on the HiWAY technique, which provides cost savings of 5–10%, or RUB 0.5 mln (net of VAT) per injection well on average, by reducing proppant, logistics and chemicals expenses. It also reduces the time needed to complete the job by accelerating the water and proppant filling. Such treatment does not impair well injectivity compared to the conventional hydraulic fracturing.
The bulk of proved reserves (over 99%) at RN-Nyaganneftegaz are concentrated in the Krasnoleninskoye field, including the Kamenny (western part), Em-Egovsky and Palyanovsky areas.
In 2020, RN-Nyaganneftegaz produced over 7 mmtoe of hydrocarbons, including 5.9 mmt of liquid hydrocarbons. The average daily flow rate of existing wells grew by 6.7 t per well, or 13%, vs 2019. A total of 207 well interventions (in addition to drilling) were performed at RN-Nyaganneftegaz's fields, leading to a 2% increase in incremental production to 0.7 kt per well.
The bulk of proved reserves (over 90%) at RN-Purneftegaz are concentrated in the Tarasovskoye and Komsomolskoye fields.
In 2020, RN-Purneftegaz produced over 6 mmtoe of hydrocarbons, including more than 3 mmt of liquid hydrocarbons.
42 new production wells were drilled (up 66% vs 2019), with incremental production expanding to 165 kt (up 60% vs 2019). The share of horizontal wells drilled using multi-stage hydraulic fracturing techniques (MSHF HWs) rose from 53% in 2019 to 69%.
The efficiency of well interventions (excluding drilling) was up 60% at 1.4 kt per well, mainly thanks to recompletions, commingling and recommissioning.
The average daily flow rate of existing wells increased by 3.2% vs 2019 to 7.9 t per well as voidage replacement grew by 3–4% year-on-year.