Enhanced Oil Recovery Solutions
| Overview | Preparation and Injection | Specifications | Criteria | Reagent Grade Selection Guide | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Our company owns the proprietary technology for enhancing oil recovery through selective water inflow control in production wells and injectivity profile leveling in injection wells by influencing the bottomhole zone of the formation using single-component gel-dispersed systems based on the KDV-series complex reagent. These gel-dispersed systems effectively seal man-made fractures and channels without penetrating the reservoir matrix. The resulting suspensions are non-Newtonian fluids with variable viscosity, allowing real-time process adjustments based on formation conditions. Due to the high hydrostatic weight of the chemical composition, pressure is generated to reopen existing fractures, ensuring stable filtration in the formation. Upon deep-layer injection, the fracture network is blocked, preventing the injectivity decline. Working solution displacement with bottom water (50–100 m³) helps maintain efficiency and prevents subsequent injectivity reductions. The use of the KDV reagent in water inflow restriction technology increases the oil content in extracted fluids by reducing the water cut (Qw) by up to 30%, with sustained effectiveness for 6 months. On average, 2.5 tons (50 m³) of solution with a 5% KDV reagent concentration is injected into each production well. In injectivity profile leveling, the KDV reagent can result in up to 19 tons of daily oil production growth (Qo) per injection well, sustained over 12 months. The typical injection volume for one injection well is 15 tons (300 m³ of solution, 5% reagent concentration). The KDV reagent is available in two grades: KDV-1 and KDV-2. These grades differ in grain-size composition but have the same chemical activator formulation. The two grades can be mixed to achieve optimal characteristics tailored for different reservoir types. The mechanism of the KDV reagent is based on gelation, which begins after the dispersion has settled, forming a reinforced gel within the reservoir. This gel ensures long-term performance. The gels formed are highly resistant to salts and temperature fluctuations, allowing them to withstand high mechanical loads and reservoir pressures. |
Preparation and Injection of Gel-Dispersed SystemThe KDV reagent is a single-component system that requires minimal preparation before injection. The process is efficient and straightforward: The dry reagent is blended with process water in a mixing tank. The mixture is then pumped into the well using a pumping unit (SIN-35/TsA-320).
The injection process provides for a controlled, systematic impact on the reservoir, ensuring long-lasting effects. Throughout the process, the concentration and composition of the reagents can be adjusted to optimize performance. The typical injection duration ranges from three to five days, ensuring a stable and sustained impact on the formation.
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KDV Reagent Specifications
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Criteria for Technology Applicability in Oil Field Development Regulation
Based on the results of pilot testing, the applicability criteria for the technology may be adjusted further.
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Selection Criteria for Reagent Grade and Concentration
Note: 1) When selecting the technology type, if the value is at the upper injectivity limit, it is recommended to use the higher-range reagent grade. 2) *The injectivity is based on a rated water injection pressure of 100 atm. |