...Abstract Abstract Controlled-ionic-composition waterflooding improves oil displacement efficiency in heterogeneous carbonate rocks. Recent microscale experimental studies confirm that the injection of brines containing high sulfate ion concentrations alters the wettability of the pore surfaces...

... Case Pre flush Pilot time Pros Cons 1 0.3 PV water + 0.5 PV ASP + 0.5 PV chase AP + 0.5 PV chase water 12-15 months Very sharp response; ASP slug injection started at high average oil saturation Incremental recovery over polymer flood will rely solely on modeling...

... J in porous media of length 1, 2, 3 and 8 mm respectively. Figure 6 (Left) Mobility reduction curves of polymer solutions reinjected on the 1mm-long core after collection at flux J1 during a first injection. The flux at which each solution was collected marked along the bottom abscissa...

..., 17 Permeability Ranges, Avg., % 10-400, 50 Oil API Gravity 21 Oil Viscosity, cp 11 Formation Salinity, ppm 7000 Field Area, Acres 750 Development Plan Peripheral Water Injection Number of drilled wells 37 Abstract Abstract The main objective of this work...

... 0.0024531 Yes Table 2 Fluid and reservoir properties for the injection pilot in the Matzen field Water viscosity 0.9 cp Polymer type HPAM (MW = 18 million) Polymer concentration c 1000 ppm Formation water salinity 20,000 ppm Injection rate Q , SC 400 m 3 /day...

... Injection of a solvent (methane/ethane mixture, 72%-28% mole fraction) into the microfracture. Figure 9 Mobility of n-octane (a) during 4 ns of primary depletion (no solvent present) and (b) during 6 ns of soaking with an organic solvent. The red dots correspond to the center of mass...

... Volume Factor 1.056 Formation Water Total Dissolved Solids ~4,400 mg/l Table 2 Chemical Injected Volume and Oil Recovery Phase 1 Patterns Pattern Volume ASP Injected (PV) Volume Total Chemical Injected (PV) Oil Recovery after Waterflood (% OOIP) 1 0.21 0.72 3.5 2...

... after two months Figure 5 a. Filtration time vs. filtered Scleroglucan solution volume, b. Rheology of the filtered Scleroglucan solution under 5 psi overhead pressure Figure 6 Pressure drop along the core plugs during polymer injection of coreflood 1 (Indiana Limestone core, 1,000...

... Table 1 Volume or Duration Criteria for SWCTT Step # Activity Volume or Duration Criteria 1 Water pre-flush 13x volume of injected tracer + chase water (step 3) 2 Short flow-back ∼ 6 hrs 3 SWCTT#1 – inject slug of tracers followed by water chase 1 pore volume...

... Table 1 Liquid level change with time (PLT) Table 2 Interpreted results Table 4 Success criteria for crossflows Table 3 Success criteria for Injectivity Index Figure 1 Place of Gauge instalation Figure...

... Table 1 EVGSAU reservoir properties Table 2 Summary of 3229-W007 IPL data Table 3 Injection profile log data by formation zone – baseline vs. foam pilot Table 4 Model prediction vs. IPL – before and after surfactant injection...

... Table 1 Surfactant Summary Table 5 Oil-water interfacial tension as a function of surfactant mole fraction Table 6 Estimated Incremental Oil Recovery due Polymer Injection Table 7 Average Processing Rate or percent HCPV inj/yr...

... Figure 1 Schematic of pulse Oil Response Function Figure 2 Indicating the relation between CO 2 injection pulse and observed oil response. Figure 3 An indicative utilization function (left) can be plotted as it's inverse (right) so that the area under the curve has...

... 2 k r o 0 0.8 S owr 0.2 n ow 2 k r g 0 0.6 S ogr 0 n og 2 Table 6 Molar rate calculation for fixed mass injection for different gas Injection gas Molar density Mass density Molar rate 5 times molar rate CO 2...

... Sequence of operational steps carried out during the one-spot polymer pilot at UNLF Well A. Activity Volume (bbl) Date Started Date Completed Pre-SWCT Waterflood (Produced water) 200 March 18, 2019 March 20, 2019 SWCT Test #1 Injection(Produced water) 77 March 20, 2019 March 21...

...×2.16 Porosity % 25.9 24.8 24.3 22.2 Absolute permeability mD 1706 1554 1783 2510 S wi fraction 0.11 0.14 0.07 0.11 Oil viscosity cP 478 487 433 467 Injection rate: Q = 0.05 ml/min Water breakthrough PV inj. 0.09 0.24 0.17 0.55 Total recovery...

... each brine. B). Average oil droplet size calculated for each injecting sequence using particle analyzer modulus in ImageJ Figure 7 Flow regime used for flooding device PN. Figure 1 Schematic of microfluidic set-up experiment. Figure 2 a) Experimental design used for snap...

... <10 <10 Bicarbonate (HCO 3 − ) 227 244 240 339 228 245 236 227 239 Total alkalinity (CaCO 3 ) 186 200 197 178 188 200 194 186 196 Table 6 Shear rate estimation at surface conditions Injection rate Velocity γ° ft 3 /seg ft/seg seg-1 2000...

...Abstract Abstract Carbonate reservoirs from Pre-salt layer are responsible for a significant volume of Brazils total oil production. Recovery mechanisms applied are mostly water injection, aiming for pressure maintenance and oil recovery increase through macroscopic oil displacement...

..., excellent stability under high temperature, high salinity, and resistance to shear. An injectivity test was conducted in the high temperature (180 °F) Adena oilfield to evaluate the injectivity of scleroglucan polymer. Field injectivity test results are compared to those from the laboratory. Polymer...