Purpose
PDS Technology is designed for enhanced oil recovery in heterogeneous terrigenous and carbonate reservoirs.
Field of Application
It is used in fields with terrigenous and carbonate productive formations, where reserves during water flooding are insufficiently and unevenly extracted due to high interlayer and zonal permeability heterogeneity.
- The injectivity of injection wells must be at least 200 m³/day at a pressure of 10 MPa;
- Low sweep efficiency due to high permeability heterogeneity of productive formations;
- Breakthrough of injected water through high-permeability zones to production wells;
How it works
The mechanism of PDS action involves selective increase in flow resistance of water-flooded reservoir intervals through polymer-mineral complexes formed under reservoir conditions, which enables redistribution of filtration flows across the area and section of the treated reservoir zone, thereby increasing reservoir sweep efficiency.
The result of PDS implementation is:
- Increase in reservoir sweep efficiency by water flooding
- Increase in reservoir pressure in previously undrained zones of the formation
- Increase in oil production rate
- Reduction in water cut of produced fluid
- Increase in productivity of production wells
- Reduction in costs for treatment of associated produced water
- Increase in oil recovery factor
Advantages
- Stability of PDS under conditions of high temperatures and high mineralization of formation water;
- Ability of the solution to penetrate deep into the formation up to 150-200 meters;
- No breakthrough of PDS through production wells along with produced fluids;
- PDS technology can effectively operate in “thief” wells with fractures and caverns;
- Successful long-term experience in technology implementation at fields with complex geological and physical conditions (over 6,700 well operations at fields in the Ural-Volga region, Western Siberia, Kazakhstan).