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Geological Survey and Production

We carry out geological survey and commercial development of hydrocarbons of the Sakhalin field in accordance with a special permit for a period of 20 years

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PJSC MC "Ukrnaftoburinnya" (UNB) is one of the leading private companies in Ukraine engaged in natural gas and oil/condensate production. Since 2010, PJSC "MC “Ukrnaftoburinnya" has been conducting geological survey and commercial development of hydrocarbons of the Sakhalin oil and gas condensate field, which classified as a medium-size field with a complex geological structure, in Krasnokutsk region of Kharkiv Oblast (northern near edge zone of the Dnieper-Donets Rift). As of the end of 2021, UNB operated 32 gas condensate and oil and gas wells with a depth of 3,800 to 5,750 m and 10 additional gas condensate wells under the terms of the joint activity agreements. The company implements a large-scale program for the development of the Sakhalin field.

In total, from 2010 to 2021:

  • over 5.6 billion hryvnias of capital investments;
  • 18 new wells drilled;
  • 46 workovers of wells made;
  • more than 5.5 billion m3 of gas produced at the Sakhalin field.

According to the results of 2021, PJSC MC "Ukrnaftoburinnya" was among top 3 companies by the volume of gas and oil/condensate production.

Within 12 months of 2021, the company achieved the following results:

  • In total, gas production at the Sakhalin field amounted to 789.5 million m3, and oil/condensate production amounted to 80.8 thousand tons.
  • More than UAH 500 million was invested in capital projects of PJSC "MC “Ukrnaftoburinnya" aimed at effective development of the Sakhalin field.
  • After 2020, the crisis year in the industry, the capital investment program was resumed. In April 2021, the drilling of the new well #22, 4,565 m deep, was successfully completed. The initial daily flowrate of the well was 280 thousand m3 of natural gas and 30 tons of condensate. Preparations for drilling the next well were also started.
  • Workovers of 9 wells were done. Well #54 was converted from the gas lift method to the pump lift method of operation with setting the bottom-hole pump (BHP) at 3251m depth, which is the biggest BHP running depth in Ukraine. Moreover, at the Sakhalin field, the implementation of a large investment project for the construction of the boosting compressor station began.
  • PJSC “MC "Ukrnaftoburinnya" ranks within top 50 taxpayers in Ukraine. As in previous years, the company fulfilled all financial obligations to the state in full and on time. In 2021, the rent paid by PJSC “MC “Ukrnaftoburinnya” for the use of the subsoil resources for the production of oil, natural gas and gas condensate amounted to about UAH 2 billion. In particular, UAH 97.5 million was transferred to local budgets.

  • Commercial development of the Sakhalin oil and gas condensate field.
  • Managing drilling works and workovers and well servicing.
  • Extraction of gas, gas condensate and oil, their preparation and transport.
  • Ensuring the field infrastructure: wells, production fluid gathering systems, oil and gas processing facilities (OGP facilities), equipment and communications for hydrocarbon export pipeline.
Production facts
The average depth of the field wells is 4500 m.
  1. PJSC “MC "Ukrnaftoburinnya" conducts production activities at the Sakhalin oil and gas condensate field in Kharkiv Oblast.
  2. Between 2010 and 2023, a large-scale exploration with a 3D seismic survey was carried out at the field. Structural interpretation and seismic images conversion to the estimated volumes were carried out by wave field inversion methods.
  3. 18 wells were drilled and put into operation. The results show the high efficiency of the work carried out and confirm the successful prospects of further exploration and production in the area.
  4. Gas, oil and gas condensate reserves increased by more than 9 million barrels of oil equivalent (9 MMBoe).
  5. Thanks to the successfully conducted prospecting-exploration drilling program, the highest Reserve-to-Production Rate in Ukraine was achieved at the Sakhalin field, and remained at a constant level for 4 years.
  6. As of January 1, 2023, the depletion of reserves is 75%.
  7. The maximum depth of reserve development is 5,800 m.
  8. The average depth of the field wells is 4,500 m.
  9. As of the beginning of 2023, there are 32 wells in operation that operate using fountain, gas lift and pump lift (BHP) production methods. 23 of them are gas condensate wells and 9 are oil wells.
  10. Velocity String technology (siphon column) is used for the operation of marginal wells.
  11. The well workovers at the Sakhalin field are optimized by timely replacement of underground equipment and the use of snubbing technology.
Production functions
Extraction of gas, gas condensate and oil, their treatment and transportation.
  1. Commercial development of the Sakhalin oil and gas condensate field.
  2. Managing drilling works, well workovers and well servicing works.
  3. Extraction and preparation of gas, gas condensate and oil, and their transportation.
  4. Ensuring the field infrastructure: wells, production fluid gathering systems, oil and gas processing facilities (OGP facilities), equipment and communications for hydrocarbon export pipeline.
  5. Improvement of methods and technologies of hydrocarbon extraction, the system of their collection, treatment and transport.
  6. Ensuring the reconstruction and technical re-equipment of field infrastructure objects, including the development and improvement of automated control systems and automation means.
  7. Carrying out physical and chemical analyzes of gas, oil, gas condensate, associated and reservoir water, and auxiliary input chemicals and production materials.
  8. Disposal of by-products.
  9. Ensuring safe work conditions, environmental measures and environment conservancy.
Geological survey works
The company digitalized all available geological and geophysical information.
  1. Geological survey works are performed using a wide range of leading international methods, including the implementation of three-dimensional subsurface exploration technologies, which includes:

    a. Collection of 3D seismic images and further processing of the data to obtain a spatial image of the wave field and inversion images that allow predicting the distribution of reservoir saturation zone.

    b. Conversion of 3D seismic images into three-dimensional static earth models and fluid flow hydrodynamic models.

    c. Study of reservoirs based on core samples and geophysical techniques followed by the creation of petrophysical models of reservoirs and caprocks.

  2. Field reserves management is carried out directly through the three-dimensional and digital models created.
  3. All available geological and geophysical information in the company was digitalized.
  4. The evaluation of geological exploration projects meets international standards that require risk management skills and the implementation of the International Classification for Energy Reserves and Resources of SPE/PRMS.

Sakhalin field
Classified as medium-sized with a complex geological structure.
  1. The Sakhalin field is located outside the populated places in the territory administratively subordinated to Krasnokutsk settlement council of Bohodukhiv region, Kharkiv Oblast.
  2. It is classified as medium-sized with a complex geological structure.
  3. By geological structure, the field is the northern coastal zone of the Dnieper-Donets Rift.
  4. The deposit consists of the Paleozoic rocks. Reservoirs are mainly represented by clastic deposits.
  5. The tectonic structure is complicated by the salt diapir, which forms the core of the structural high, and numerous displacements. Hydrocarbon reserves are concentrated at depths of 3,200 - 5,800 m.

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