An action plan to enhance oil recovery from heavy crude oilfield

As the reservoir fluid is extracted from the oil-bearing reservoir, the natural energy, under the action of which the fluid flows into the production wells, decreases and, as a result, the flow rates of production wells drop down. Currently, the newly commissioned oilfields in the Republic of Tatarstan and the Ural-Volga region are characterized by the presence of viscous oil and low reservoir pressure, as well as directionally drilled the wellbores. In this regard, the task of oil recovery enhancement, creating a way to intensify oil production under conditions of low reservoir pressure and high viscosity of the production becomes urgent. The article proposes a comprehensive method to develop a highly viscous oil fi d, comprising drilling a system of interconnected vertical and horizontal wells. Experience in creating a hydrodynamic connectivity in a fragment of an oil well system and the results of the steam-heat and chemical treatment of the bottom-hole zone of this fragment are also presented.
Materials and methods
Field experiments and testing of a fragment of a system of intersecting and interconnecting vertical and horizontal wells.
Results
In the period 2012-2014 fi d trials were carried out to create a fragment of the wells system of the proposed method of operating heavy crude oilfields of the Sheshmaoil JSC. A number of activities to create a hydrodynamic connection between well No.3752 and well. No.3764, conducting the BHZ treatment, as well as reducing the dynamic fluid level through deepening the suspension of the downhole pumping equipment in a wellbore’s inclined directional section during introduction of the ND-NGS installation, made it possible to increase the flow rate by 1.2 tons / day, which amounted to 133%.
Conclusions
Based on field trial results of a well system fragment created from the horizontal well No.3752 and the vertical well No.3764, the following conclusions can be made: 1. A stable hydrodynamic connectivity has been provided, which makes it possible to reduce the number of pumping equipment; 2. Oil flow from the well system under pressure drawdown has been increased, additional production amounted to 98 tons of oil; 3. The effectiveness of the proposed method has been confirmed.