Innovative projects of 2019 and performance achieved within their scope
Development of Russian-Made Power Plant Using Oil of any Class
An innovative project was initiated due to the significant costs of procuring diesel fuel for power generation at JC RUSVIETPETRO LLC fields and the challenges of delivering it. The project intends to use Russian equipment (engines by Kolomensky Zavod) for up to three (inclusively) oil classes (high viscosity and sour) and increase the time between overhaul of power machinery.
Existing power machines manufactured abroad and by Kolomensky Zavod require a high degree of oil treatment and are designed for operation with first class oil (light and sweet). Fuel equipment (injection nozzles, pipeline system) creates a bottleneck in the operation of power unit vehicles with oil.
Within the scope of the innovative project, in 2017–2019, R&D and design activities were undertaken to improve power plant equipment operating with class 3 oil, develop design documentation, bring the power plant to a level of oil industry standards, and conduct pilot testing at JC RUSVIETPETRO LLC.
The diesel oil power plant was manufactured and delivered to the JC RUSVIETPETRO LLC field. The power plant passed pilot testing with diesel fuel and switched to oil for oil pilot testing; further testing of upgraded equipment and assemblies was conducted as a part of R&D.
In 2019, pilot testing of the power plant fueled by oil continued. According to the R&D, two applications were submitted to the Russian Agency for Patents and Trademarks for patenting unique technical solutions intended to upgrade power plant assemblies to stable operation with oil up to class 3, inclusively. A patent on the invention has been obtained.
Technology of Oil Recovery Enhancement of High-Viscosity Oil Fields by Catalytic Aquathermolysis
Since 2017, the Company and Kazan Federal University have carried out R&D on technology of oil recovery enhancement of high-viscosity oil fields by the method of catalytic aquathermolysis. The technology intensifies intra-formation treatment of heavy oil during steam treatment, which increases oil quality and reduces its viscosity. Improvement of oil properties in formation conditions will increase the energy and economic performance of Boca de Jaruco field development (and potentially other similar fields in the zone of heavy oils in Cuba and other countries).
In 2017-2018, a number of experiments were carried out at Kazan Federal University to select the most efficient catalyst using a reactor. The selected nickel catalyst ensures the maximum conversion of oil and significant reduction of viscosity, with an additional advantage of low price as compared with the cobalt catalyst.
In 2018, the second research stage was completed to address the remaining research issues: evaluation of catalytic activity; coking of the catalyst during aquathermolysis processes; catalyst adsorption on the rock (displacement in the combustion pipe); and study of solubility, thermal stability, and filtration performance of the developed catalyst solution. A test batch of the catalyst was manufactured for pilot testing.
In 2019, the catalyst was delivered to Cuba by sea. Preparations for pilot testing of the technology were completed and basic cyclic steam treatment was provided for the candidate well (without catalyst). In November-December 2019, Zarubezhneft JSC specialists successfully injected the catalyst into the formation with further cyclic steam treatment. At present, pilot testing is ongoing, oil is being produced.
In August 2019, a joint application (with Kazan Federal University) was submitted to the Russian Agency for Patents and Trademarks for patent registration for the method of developing bituminous carbonate reservoirs using cyclic steam soaking and aquathermolysis catalyst. A patent on the invention has been obtained.
Pilot Testing of Surfactants in a Single Well by SWCTT Method in JC RUSVIETPETRO LLC
In 2019 at the Zapadno-Khodesayuskoye field, JC RUSVIETPETRO LLC successfully completed pilot testing for BASF surfactants in a single well to improve oil recovery of hydrophobic carbonate reservoirs. It should be noted that Zarubezhneft JSC’s pilot testing by the Single Well Chemical Tracer Test (SWCTT) method for carbonate reservoirs was the first pilot testing of this type ever conducted in Russia. The primary idea behind SWCTT is using chemical tracers to determine the residual oil saturation when oil is displaced by water and surfactants. SWCTT is intended to relatively quickly find the rise of displacement efficiency for surfactant and water.
The test results proved efficient performance of the selected composition. In accordance with the analytical interpretation, the displacement efficiency growth was 0.07 (when exposed to surfactant) as compared to that of water.
Pilot testing in using diverter technologies in Zarubezhneft-DOBYCHA KHARYAGA LLC
Zarubezhneft-Dobycha Kharyaga LLC successfully continues pilot testing of diverter technologies (injection of cross-linked polymeric compositions based on polyacrylamide), a project that has been under way since 2017. The project’s primary objective is to test the technology of re-distributing filtration flows of injected water using polymeric compositions injected into active wells.
The project covers D3-III formation wells of Kharyaga field Devonian sediments. Thirteen wells were treated in 2017-2019, with 18,215 m3 of cross-linked compositions injected.
Additional oil production is evaluated upon pilot test results using displacement characteristics methods that are common in Russia. The cumulative additional oil production for the given period is estimated to exceed 140,000 tons, with more than 75,000 tons of oil produced in 2019.