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Collaborating Authors
Results
Edge-Water Drive Recovery Enhancement by Induced Fines Migration
Zeinijahromi, Abbas (Australian School of Petroleum, The University of Adelaide, Australia) | Al-Jassasi, Hammam (Australian School of Petroleum, The University of Adelaide, Australia) | Zhang, Yizhong (Australian School of Petroleum, The University of Adelaide, Australia) | Begg, Steve (Australian School of Petroleum, The University of Adelaide, Australia) | Bedrikovetsky, Pavel (Australian School of Petroleum, The University of Adelaide, Australia)
Abstract Oil bypassing is a significant problem in edge-water drive reservoirs. The encroaching water from an active aquifer overruns oil and leaves a significant volume of trapped residual oil behind. This causes pre-mature water production and early well abandonment. The technique to inject small volume of low salinity water into abandoned wells in order to create a low permeable barrier against the water fingers is presented. In addition a method of applying commercial reservoir simulators to model the process is introduced. The modeling results shows that injection of small volume of low salinity water results in increasing reservoir production life and consequently 4.5% incremental recovery if compared to normal depletion. The economic evaluation of the technique resulted in NPV value of +7.84 MM US$ meaning that the technique is viable from economic stand point.
- North America > United States > Texas > Permian Basin > Yeso Formation (0.99)
- North America > United States > Texas > Permian Basin > Yates Formation (0.99)
- North America > United States > Texas > Permian Basin > Wolfcamp Formation (0.99)
- (21 more...)
Abstract The external filter cake build-up with its final stabilization has been widely reported for waterflooding in oilfields, drilling, produced water re-injection and disposal of produced water in aquifers. The brief overview of the models for cake formation and stabilization is presented. We derive the mechanical equilibrium equation for stabilized cake accounting for electrostatic force and for varying permeate force factor. The main empirical parameter of the model, highly affecting the stabilized cake prediction is the lever arm ratio for the particle on the cake surface. The lever arm ratio was calculated from laboratory cross-flow filtration experiments and from well injectivity data. It was also determined from Hertz's theory for the elastic particle deformation on the solid cake surface. Good agreement between the results validates the developed mechanical equilibrium model with the lever arm ratio determined from the elastic particle deformation theory.
- Europe (1.00)
- North America > United States > Louisiana (0.28)
- Energy > Oil & Gas > Upstream (1.00)
- Water & Waste Management > Water Management > Lifecycle > Disposal/Injection (0.35)
- Well Drilling > Drilling Fluids and Materials > Drilling fluid selection and formulation (chemistry, properties) (1.00)
- Reservoir Description and Dynamics > Reservoir Fluid Dynamics > Flow in porous media (1.00)
- Reservoir Description and Dynamics > Improved and Enhanced Recovery > Waterflooding (1.00)
Abstract Water channeling through high permeable layers during water flooding results in poor sweep efficiency. There are high costs involved in chemical methods of controlling mobility. Many laboratory studies evidence that injection of water with low salt concentration leads to significant decrease in the core permeability. In this paper the possibility of applying induced fines migration as an enhance oil recovery technique was investigated by modeling of the process. It was shown that the system of equations for water injection with induced formation damage is equivalent to polymer-flooding. It enabled applying polymer option of Eclipse black-oil simulator to model low salinity water flooding with induced formation damage. Investigation of the effect of induced formation damage on sweep efficiency during high salinity and low salinity water flood were the main aims of this study. Eclipse polymer flood model was used to model water injection with induced formation damage in a two layer cake reservoir. Analysis of modeling results showed that induced formation damage was favorable to sweep efficiency. Displacement of oil with low salinity water with induced formation damage resulted in up to 19% extra oil recovery. The sensitivity study showed that improved sweep during low salinity water injection was sensitive to heterogeneity, permeability reduction value, and slug volume. Introducing the permeability dependency of formation damage coefficient reduces IOR effects of induced formation damage during low salinity water flooding if compared with the case of constant formation damage coefficient. Several water flood scenarios with injecting different volume of low salinity water were modeled in order to determine the optimum low salinity slug volume. It was shown that injection of 0.5 PVI of fresh water with high salinity water drive results in similar incremental recovery if compared with continuous injection of low salinity water.