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Main page Business Upstream Onshore exploration and appraisal
Onshore exploration and appraisal

The development of resource potential and the rational development of subsoil resources, with strict observance of environmental safety standards and the widespread introduction of modern technologies is one of the key priorities of the Company. To increase the success of exploration drilling, step-by-step implementation of advanced technologies for processing and interpreting seismic data continued. Innovative approaches to account for inhomogeneities of the upper part of the column are used to minimize the forecast error for structures. At the design stage, finite-difference modeling of the wave field is carried out  to select the optimal parameters of the seismic survey.

By the end of 2017, 155 exploratory wells were completed onshore in Russia, which is almost twice as high as in 2016. At the same time, the Company achieved the maximum historical success of geological exploration, which reached 86%. 7 thousand lin. km of 2D seismic survey and about 10 thousand square km of 3D seismic survey were completed, which is 2.5 and 1.3 times higher than in 2016, respectively.

As a result of successful exploration, 30 fields  and 162 new deposits were discovered with total reserves of 148 million tons of oil equivalent.

Western Siberia

The reserves addition in Western Siberia amounted to 155.8 million tons of oil and condensate and 127.1 billion cubic meters of gas. 55 exploration wells were completed and tested with a success rate of 91%. More than 2 thousand lin. km of 2D seismic survey and more than 3 thousand square kilometers of 3D seismic survey were carried out. Five greenfields and 38 new deposits with total reserves of AB1С1 + В2С2 of 87.6 million toe were discovered.

In the south of Western Siberia, RN-Uvatneftegaz LLC consistently implements the strategy of development of the Uvat project, including the annual replacement of recoverable reserves. For 2017, the replacement was more than 2 times higher.

On the assets of RN-Uvatneftegaz LLC, 5 hydrofracturing operations were carried out, according to the results of which two greenfields were discovered and included in the balance sheet: Imgytskoye field - recoverable reserves of 4.4 million toe (C1 + C2) and the A.S. Parasyuk field - recoverable reserves of 0.9 million toe (C1 + C2). Also, based on the results of exploratory well drilling on the Bolsheturtas structure, the Yu.V. Oznobikhin field was discovered and included in the state balance, the recoverable reserves of which are 1.4 million toe (C1 + C2).

In Western Siberia in 2017, a new oil and gas cluster was formed on the basis of the integration of Kondaneft assets and the Ergin licensed site acquired at the auction with reserves of 103 million tons. The Ergin cluster includes part of the Priobskoye field (within the Erginsky LS), the West Erginsjoye, Kondinskoye, Chaprovskoye, and Endyrskoye fields. As of January 1, 2018, the recoverable reserves  (АВ1С1 + В2С2) were 256 million tons of oil. The total area of licensed sites is more than 5 thousand square kilometers. In order to develop the resource potential, exploration and appraisal is carried out at all sites. So in 2017, 3 exploratory wells were completed by tests, 720 sq. km of 3D seismic survey were completed.

The company is actively continuing to develop the gas business. In 2017, on the Company's gas assets, exploration and appraisal was carried out in the following volumes: 2D seismic survey  - 2 134 km km, 3D seismic survey - 675 sq km, 4 wells were completed by tests. A regional scientific work to study the Gydan Peninsula has been carried out, which makes it possible to form a geological and geophysical basis for selecting promising areas. The increase in the Company's gas reserves in Western Siberia amounted to 127.1 billion m3 in 2017.

In 2017, large-scale seismic survey work was completed at the Minhov license area of federal significance, where 700 square kilometers were surveyed in total.

To assess the resource potential and extraction capabilities of free gas of the Berezovskaya suite at the Kharampur field in 2017, a program was successfully implemented to localize gas reserves, to select and develop technologies for developing low-permeability gas deposits. As a result of the hydraulic fracturing in two wells, industrial gas flow rates of 64,000 m3 / day and 88,000 m3 / day were obtained. 

Eastern Siberia and the Far East

11 exploration wells were completed with a success rate of 82%. 4,5 thousand lin. km of 2D seismic survey and 1.5 thousand square kilometers of 3D seismic survey were carried out. 5 new deposits with the  reserves of 15,7 million toe of AB1С1 + В2С2 were discovered.

For the year,  the reserves addition of industrial categories amounted to 36 million tons of oil and condensate and 24 billion cubic meters of gas.

In the Khatanga cluster of the Company on the Taimyr Peninsula, a large-scale 2D seismic survey project was completed in the volume of 4476 lin. km (Vladimirsky, Kungasalakhsky, Kupchihtassky and Kubalakhsky licensed sites).

Within the projects in the Krasnoyarsk Territory, in order to confirm the productivity for complex fractured carbonate reservoirs and increase the area of reserves in 2017, the Company for the first time carried out pilot drilling of a 3-bore exploratory well at the Kuyumbinskoye field with 2 deviated sidetracks and 1 horizontal wellbore. As a result of the test, a natural flow of oil was obtained with a flow rate of more than 220 cubic meters per day.  The reserves addition for a three-bore well amounted to 4.2 million tons of category B1, which is 1.3 times more than for a vertical well. For another exploratory well of the Kuyumbinskoye field, we received a natural flow of oil of 309 cubic meters per day; a new YUK-8 deposit was discovered, the total reserves addition in category B1 + B2 will amount to 11.7 million tons. Entering the reserves in the balance sheet is planned for 2018.

At licensed sites in the Irkutsk Region  , based on the results of the B1 test, high productivity of a principally new type of facilities in the region has been proved. Osinsky reefs are characterized by high productivity among the extensive zone of development of HTR reserves.

Central Russia, Timan-Pechora and the South of Russia

In 2017, the total reserves addition in the Volga-Ural region, Timan-Pechora and in the south of Russia amounted to 77.1 million tons of oil and condensate and 12 billion cubic meters of gas. 89 wells were completed with a success rate of 83%. 5 thou. sq. km of 3D seismic survey were performed. 25 greenfields and 119 new deposits with total reserves of АВ1С1+В2С2 of 45 million toe were discovered.

In 2017, Orenburgneft PJSC carried  out a significant volume of 3D CDPM seismic survey  - 1607 sq.km at sites purchased in 2016-2017. (Yekaterinovsky, Chernoyarovsky, Yurtayevsky, Kinelsky, Aldarkinsky). Based on the results of research on the total area of 3.8 thousand square kilometers, locations for drilling and exploratory wells will be determined. The total resource potential of the sites  is more than 80 million tons of oil according to the state estimate.

Based on the results of geological survey work in the south of the Samara region, a greenfield of the Bashkirian deposits located at the Padovsky licensed site was discovered using a pioneer well. As a result of the tests, a oil free flow was obtained with a flow rate of 91.3 m3 / day. Scientific work has begun to justify further prospecting in a new direction of reef structures in the Bashkirian sediments.

One of the key area in 2017 for the Orenburg Region was the prospecting to search through the reefogenic formations of the Frasnian age within the Volostnovsky LS; 15 exploratory wells were tested on various structures of licensed sites; the high productivity of all reefs was confirmed, the wells completed by the test program were commissioned with well rates from 50 to 390 tons per day. At the same time, the success ration of drilling exploratory wells in reefs was 100%

For the assets of PJSC ANC Bashneft in the Ural-Povolzhsky region, 4 greenfields and 48 new deposits were discovered in 2017 with reserves of category АВ1С1 + В2С2 of 6.6 million toe. Thanks to the implemented set of measures for geological justification of candidates for prospecting drilling, a significant increase in success was achieved from 65% to 82%.

The justification for the placement of wells is exclusively based on 3D seismic survey data, drilling can be canceled on structures prepared only 2D seismic survey. 3D seismic survey makes it possible to reliably study the structural map of production horizons and to reveal the anomalies-forming factors in the upper part of the sediment section that negatively affect the accuracy of the seismic forecast.

For the assets of PJSC ANC Bashneft in the NAO, at the licensed site which includes the  A. Titov and R. Trebs field, 2 exploratory wells were constructed with 100% success. The reserves addition of В1 / С1 based on the results of exploratory drilling amounted to 0.8 million toe, according to the results of production drilling - 4.3 million toe. Two deposits were discovered with reserves of category АВ1С1 + В2С2 - 1.7 million toe.

In the Timan-Pechora province, after drilling an exploratory well at the Naulskoye field, a flow of anhydrous oil with a flow rate of more than 100 m3 / day m has been obtained in reefogenic formations. The reserves addition for  B1/C1 well is 1.8 million tons.

In the south of the Russian Federation, the Company continues to perform systematic geological surveying to replenish the region's resource base. In 2017, for the first time in the region, 2D seismic survey was carried out using the super-dense technique in the volume of 200 lin.km, as well as 110 square kilometers of 3D seismic survey. The meters drilled as part of exploratory drilling amounted to more than 15 thousand meters; 6 wells were completed by tests; work is underway to test promising facilities.