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Zervando K.Y.,TNK BP | Safonov V.G.,TNNC
7th EAGE Saint Petersburg International Conference and Exhibition: Understanding the Harmony of the Earth's Resources Through Integration of Geosciences | Year: 2016

The report demonstrates the main results of exploration activities within the Uvat project in the last 10 years. The experience of application of the new techniques such as inversion and basin modeling is described. The evolution of ideas about geology and regional petroleum potential of Uvat area is also described.The profile of successful E&A drilling and growth of recoverable oil reserves in 12 years is given, which reflects the efficiency of the geological study strategy for the Uvat project generated by studying the results of exploration activities and scientific and analytical support. This approach can be used on other major projects of the company at an early stage of their development.

Kovalenko Igor V.,TNK BP
Society of Petroleum Engineers - SPE Heavy Oil Conference Canada 2012 | Year: 2012

Today considerable amount of hard-to-recover reserves from low reservoir properties formations or high-viscosity oil are involved into development. Hydraulic fracturing or horizontal wells drilling are applied to provide economic development. On the one side the low piezoconductivity value reduces the rate of pressure redistribution in the reservoir around the well. On the other side hydraulic fracture or horizontal well move away the radial flow in the reservoir for a considerable distance from the well. The joint presence of these two conditions leads to a failure to achieve radial flow at the appropriate times resulting in a high uncertainty during well testing interpretation. This article describes approaches of uncertainties reduction during the well testing interpretation in case of failure to achieve the late pseudoradial flow. The suggested method is based on the application of the special filtration equations in the early regimes to linear drain where as an example the horizontal well or hydraulic fracturing in the reservoir was provided. The presented solutions were successfully applied in both the heavy oil fields and in the other types of fields where the late filtration radial regime was not achieved during the well testing. Copyright 2012, Society of Petroleum Engineers.

Malysheva E.,TNK BP
75th EAGE Conference and Exhibition Incorporating SPE EUROPEC 2013 | Year: 2013

The presentation will touch upon the comparison of well based and seismic interpretation models on the example of two hydrocarbon fields in Pechora oil and gas basin. It shows that the latter provides much more accurate lateral distribution of reservoirs in the inter well space. On the other hand in complicated polyfacial successions only apriori depositional models provide accurate and geologically reasonable interpretation of seismic data.

Kats R.M.,Russian Academy of Sciences | Volgin E.R.,TNK BP
Society of Petroleum Engineers - SPE Russian Oil and Gas Technical Conference and Exhibition 2010, RO and G 10 | Year: 2010

The localization of oil reserves in water-flooded areas is considered. Despite a high watercut of 90% or more well production, individual regions of the reservoir can retain recoverable oil. These reserves may have rather high (up to initial) oil saturations. Developing these reserves even partly will deliver a valuable incremental field production. Oil field development experience shows that recovery factor can be comparatively low, even at the late development stage. The issue of additional recovery is illustrated by the Bavly oil field experiment which ran for 30 years. This experiment included high watercut wells that were shut-in for a long time and subsequently brought back into production, and some of the wells yielded tens of thousands of tons of crude. Moreover it was established that remaining reserves can be located in certain areas. So, the problem of finding the location of such areas needs to be solved without resort to large-scale experiments like this. If we could do this, the scope of late stage infill drilling could be reduced thus preventing wells being drilled in swept zones. Currently the issue of finding high oil saturation zones is generally solved through reservoir modeling. The issue of the accuracy of modeling oil saturation distribution is of primary importance for a reservoir engineer. There are a variety of numerical methods for modeling oil and gas field development processes widely in use, but are not sufficiently reasonable for this goal. In the general case, heterogeneous media cannot be described by averaged equations with scientifically based pseudo-relative permeabilities. The inconsistency of using pseudo relative permeabilities for simulation of the heterogeneous reservoir development is illustrated by numerical experiment. The pseudo relative permeabilities technique enables forecasting the field production and injection rates and cumulatives only. The reliability of the prediction of the oil saturation distribution turned to be unsatisfactory. This means that currently used pseudo relative permeabilities techniques do not allow reliable detection of bypassed oil. At the moment, the only efficient method of locating unrecovered oil reserves is integration of advanced reservoir study methods combined with geological modeling and reservoir simulation. Copyright 2010, Society of Petroleum Engineers.

Akhkubekov A.E.,Rosneft | Vasilyev V.N.,TNK BP
Society of Petroleum Engineers - SPE Russian Oil and Gas Technical Conference and Exhibition 2010, RO and G 10 | Year: 2010

Petroleum industry needs low-cost and efficient hydrocarbon production enhancement techniques. Oil and gas reserves production need to be economic; therefore high-technology stimulation methods should be used. The considerable part of hydrocarbon world reserves is associated with carbonate reservoirs. To enhance production in carbonate reservoirs, the conventional and special techniques are applied. Sidetracking includes heavy expenses in both money and time, since it requires rig installation and drilling crew gathering. The carbonate natural property of dissolution with acid is used in acidizing and acid fracs. Acid treatment is inefficient in thick reservoirs, thus the treatment design becomes quite complex to achieve efficient acid placement. The acid frac efficiency in carbonate reservoirs is controlled by matrix to fracture porosity ratio, whereas acid fracs in fractured reservoir with zero matrix porosity will be unefficient. This paper describes the possibility to apply a relatively new enhancement technique - acid-tunneling - in Timan-Pechora oil province carbonate reservoirs in Russia. In this paper the evaluation methods of vertical and multilateral well potential are specified; the productivity ratios of various multilateral well designs in dual porosity reservoirs vs. permeability anisotropy are shown; the pseudoradial skin-factor calculation procedures of multilateral well are described. The well candidate technologic and economic selection criteria are also considered. As a result, the matrix of production enhancement technology application in Timan-Pechora oil and gas province has been developed. Copyright 2010, Society of Petroleum Engineers.

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