... heavy oil reservoir from Bohai Bay as an example, the approach to determine gas-liquid phase equilibrium constants of multi-agent-heavy oil system is established, the nonlinear interpolation method of fluid viscosity considering the diffusion of gas molecules is proposed, and the numerical simulation...

... that the CO 2 -emulsion system is stable at 210°F for extended periods of time without any emulsion breakage or phase separation. The effective viscosity of CO 2 was increased by 3-4 orders of magnitude and approached 100 cP at reservoir conditions. Results also show the emulsion's ability to severely reduce...

... (%) Permeability (md) Test 1 31 127 Test 2 32 139 Test 3 32 140 Experimental Setup Abstract In spite of CO 2 mobility reduction during CO 2 and surfactant solution co-injection, CO 2 -foam flooding in heavy oil reservoirs has relatively poor sweep efficiency due to the high viscosity...

... Phase Behavior experiment surfactant solution oil phase viscosity NaCl situ microemulsion formation Visualization society of petroleum engineers Oil Recovery Introduction The capillary forces acting along fluid-fluid and fluid-solid interfaces often cause a significant entrapment...

... Stratification factor 4.82 2.4 1.4 3.3 1.16 1.06 Initial reservoir temperature, °C 26.8 20.5 20.4 20.4 20.0 24.0 Initial reservoir pressure, MPa 14.1 10.0 9.5 9.50 9.50 9.50 Viscosity of oil in reservoir conditions, mPa·s 19.85 n/a 21.8 21.8 n/a 16.64 Oil density in reservoir...

... Abstract The aim of this study was to reduce risk in polymer flooding projects. Specifically, this study investigates polymer retention and viscosity losses. The study reservoir is a fluvial type reservoir with friable/unconsolidated sandstone units that are saturated with viscous oil...

... and increase sweep efficiency by its high viscosity. In order to gain input parameters for polymer solution viscosity in simulation, we have taken polymer solution sample from produced fluid in the monitoring well where located in the middle of the injector and producer to measure its bulk viscosity...

..., the foam stability is improved. But viscosity reduction of polymers or polymer gel usually brings a lower viscosity of foaming solution which decreases foam stability when transporting in porous media. On the other hand, the wettability of inorganic particles usually changes when contacting with reservoir...

... and successfully tested both at laboratory and field conditions. polymer viscosity HPAM Upstream Oil & Gas concentration low salinity brine Caracara Sur Field divalent cation chemical flooding methods low salinity HPAM polymer application enhanced recovery polymer solution effective...

... and fluid communication between the wells. For super heavy oil reservoirs in Fengcheng project in China, since the pay zone has low thermal conductivity and extremely high oil viscosity, establishing the temperature profile required for SAGD conversion using conduction as the only heating mechanism...

...-gelling polymers (refers as THR). This technology differs from the ones currently used through different aspects. Thermo-gels polymers spontaneously gel when they reach a threshold temperature. Below this temperature, the product behaves as low-viscosity fluid, with good injectivity in reservoir rock...

.... In flow through porous media, both solutions flow-thin at low flow rates (a decrease in apparent viscosity on increasing flow), however HPAM solutions exhibit apparent flow thickening at high flow rates (an increase in apparent viscosity on increasing flow), a behaviour not shown by xanthan solutions...

... case study in the simulator. Table 2 Suggested values for a reservoir candidate to go through a polymer flood process (Dickson et al., 2010). Property Suggested in Literature Case Study In-situ oil viscosity (cp) 10–1000 20 Reservoir temperature, °F <170 150 Initial...

...) and hydrodynamic size for their optimal design. The range of Mw for various types of available HPAMs is between 4 and 30 million g/mol and is typically determined using intrinsic viscosity measurement. Molecular weight distribution (MWD or PDI) cannot be determined since neither standards with low PDI nor GPC/SEC...

... for producing heavy oil or oil sand is to reduce the oil viscosity by in-situ combustion, while that for the light oil is to drive out the oil by using produced flue gas, the thermal effects and via mobility control ( Surguchev, 2009 ). Compared to the heavy oil recovery, the EOR mechanism for light oil is more...

... on the viscosity of the foam. A high pressure high temperature rheometer setup was used to shear the CO 2 foam for the three different systems and the viscosity was measured with time. It was found that the viscosity of the CO 2 foams generated by these new systems of polyelectrolytes were slightly improved than...

... of chemical enhanced oil recovery methods. Several options do exist to tackle these challenges. Developing more costeffective polymers is one of these. Traditional partially hydrolyzed polyacrylamides (HPAM) are sensitive to brine hardness and temperature; increasing both lead to a drop in viscosity which...

..., the economic success of the project is only feasible when injection rate is high for high viscosity solution. However, injection of viscous polymer solutions has been a concern for the field application of polymer flooding. The pressure increase in polymer injectors can be attributed to (1) formation...

... The objective of this paper is to investigate diversion mechanisms of TAP in highly permeable unconsolidated sand. Laboratory work was performed in order to quantify the impact of permeability reduction and viscosity increase on the global mobility reduction occurring before and after swelling...

...Fluid Preparation and Properties shear viscosity complex viscosity geometry porous media Upstream Oil & Gas normal stress difference microrheology shear rate rotational rheometry enhanced recovery concentration pressure drop relaxation time rotational rheometer chemical...