Potential for polymer flooding reservoirs with viscous oils. The method shown requires a preflush to condition the reservoir, the injection of a polymer solution for mobility control to minimize channeling, and a driving fluid water to move the polymer solution and resulting oil bank to production wells. It does not recover the residual oil that is trapped in rock pores after. Modeling polymer flooding, surfactant flooding and asp schlumberger public surfactant flooding and asp alkaline, surfactant, and polymer flooding with eclipse charles a. Chemical enhanced oil recovery eor is surely a topic of interest, as conventional oil resources become more scarce and the necessity of exploiting heavy and unconventional oils increases. Reduced injectivity may be a greater concern for polymer flood application than the chemical cost of viscous polymer. Polymer flooding is a tertiary recovery method by adding highmolecularweight polyacrylamide into injected water, so as to increase the viscosity of fluid, improve volumetric sweep efficiency, and further increases oil recovery factor. A variety of polymers is used in different oil fields depending on working conditions of that field. Polymers for enhanced oil recovery technology core. The design includes reservoir characterization, laboratory study, modeling pumaflow tm software, recommendation for surface facility and onfield.
Primary recovery in primary recovery, oil isforced out by pressure generated from gas present in the oil. Over the past forty years, the enhanced oil recovery industry has produced a number of excellent and proven eor technologies. Optimise co2 injection polymer flooding the eor alliance. Enhancing polymer flooding performance 30 years of. Improving oil recoveryior with polymer flooding in a. Recently, low salinity brine injection has been given a great interest as a technique for enhanced oil recovery eor by waterflooding. Enhanced oil recovery eor modular injection systems can be tiedin to existing injection lines. The performance of polymer flooding in heterogeneous. Participants will become familiar with all currently deployed eor techniques, including miscible and immiscible gas flooding, chemical methods including polymer and surfactant flooding, thermal flooding, modified brine flooding and more. Varying experimental results have been reported in the literature, from many promising results to limited or no effects of low salinity. Pdf status of polymerflooding technology researchgate. Extend the application of polymer flooding to difficult reservoir conditions heavy oil, high salinity, high hardness, low permeability formations, high temperatures, etc. Distinction between polymer floods and gel treatments.
When oil is displaced by water, the oilwater mobility ratio is so. Polymer flooding is the most commonly applied chemical enhanced oil recovery technique. Viscosity is increased until the mobility of the injectant is less than that of the oil phase in place, so the mobility ratio is less than unity. Pope center for petroleum and geosystems engineering the university of texas at austin casper eor workshop october 26, 2007. Other successful polymer flooding projects in chinese oil fields such as the shengli and bohai bay have been described in. Eor can extract 30% to 60% or more of a reservoirs oil, compared to 20% to 40% using primary and secondary recovery. The application of low salinity water in combination with other established eor processes e. In traditional water flood systems, water is pumped through injector wells to. Enhanced oil recovery eor using flooding polymer polyacrylamide 1. If only the developable oil reserve being taken into account, the final oil recovery is.
Chemical injection or usually known as chemical flooding was, up to 2000s, less common eor method than thermal and gas but now, huge projects are initiated. Brief introduction to polymer flooding and gel treatments. Provides an easytoread introduction to the area of polymer flooding to improve oil production the production and utilization of oil has transformed our world. Surfactant and surfactantpolymer flooding for enhanced oil recovery article pdf available january 2011 with 1,760 reads how we measure reads. Spe 129899 potential for polymer flooding reservoirs with.
Overview of polymer flooding eor in north africa fields elements of designing a new polymersurfactant flood offshore case study. Eor alliance has demonstrated its capability in designing successful polymer flood projects. The eor joint industry task group was formed in late 2016 and comprised representatives from chevron, shell, bp and statoil, all of which are currently developing polymer eor projects on the uk continental shelf. Polymer flooding is used under certain reservoir conditions that lower the efficiency of a regular waterflood, such as fractures or high. Successful enhanced oil recovery eor can play a huge role in maximising economic recovery. Polymer flooding is an eor method that uses polymer solutions to increase oil recovery by decreasing the wateroil mobility ratio by increasing the viscosity of the displacing water. Polymer enhanced oil recovery industry lessons learned. The three major types of enhanced oil recovery operations are chemical flooding alkaline flooding or micellarpolymer flooding, miscible displacement carbon dioxide co 2 injection or hydrocarbon injection, and thermal recovery steamflood or insitu combustion.
Physical properties of associative polymer solutions. Enhanced oil recovery eor by combined low salinity water. Modeling polymer flooding, surfactant flooding and asp. Fundamentals of carbon dioxideenhanced oil recovery eor. This method is similar to thermal eor, but uses a solar array to produce. Eor methods best method for enhanced oil recovery from sarvak reservoir and. Since the viscosity of this polymer network is significantly larger than that of independent, individual polymer chains, associative polymers in general are able. Cost of eor fluids schlumberger public april 11 ntnuseminar 11 eclipse blackoil. Polymer flooding recovers mobile oil that has been bypassed during earlier waterflooding or aquifer intrusion due to reservoir heterogeneity. Polymer flooding, enhanced oil recovery eor, chemical eor, polymer. Extend the application of polymer flooding to difficult reservoir conditions heavy oil, high salinity, high hardness, low permeability formations, high temperature, etc. An introduction to enhanced oil recovery techniques. In traditional water flood systems, water is pumped through injector wells to push oil towards production wells.
An enhanced oil recovery technique using water viscosified with soluble polymers. Incremental oil recovery as a result of polymer injection is approximately 12% ooip. This condition maximizes oilrecovery sweep efficiency, creating a smooth flood front without viscous fingering. The enhanced oil recovery eor effects of the polymer are studied by physical simulation experiments, and the results of application in an actual. Surfactant and surfactant polymer flooding for enhanced oil recovery article pdf available january 2011 with 1,760 reads how we measure reads.
The daqing polymer flooding case has been extensively discussed previously in this chapter. Pdf injection falloff analysis of polymer flooding eor. Enhancing polymer flooding performance 30 years of experience. Spe 129899 potential for polymer flooding reservoirs with viscous oils 3 permeability dependence of resistance factors. After this stage, fullfield deployment can be considered.
Mobility ratio and eor potential depends on effective polymer viscosity for some polymers, the viscosity depends strongly on salinity. Polymer enhanced oil recovery industry lessons learned 9 2. Polymercoated nanoparticles for enhanced oil recovery. This school covers the basics of enhanced oil recovery processes, which aim at lowering the mobility of water polymer flooding andor at lowering the interfacial tension between the oleic and aqueous phases in the oil reservoirs surfactant, alkalisurfactant polymer. This paper provides an update on the status of polymerflooding technology, focusing more on field applications than on theoretical and laboratory research. Target resource for eor applications is 6 trillion barrels, of the 9 trillion initially in place widespread application could far exceed the current forecasts chemical polymer flooding has large unrealized potential both hydrocarbon and co2 miscible flooding have large potential internationally a significant resource exists in the offshore, as. Typical metrics for performance and economics of eor will be provided. Pdf overview of polymer flooding eor in north africa fields. Polymer flooding reduces costs related to water handling. For existing eor polymers, viscosity increases roughly with the square of polymer concentrationa fact that aids the economics for polymer flooding of viscous oils. Polymer flooding polymer flooding is one of the most widely used eor methods to retrieve oil left. Polymers help increase the viscosity of the displacing liquid water to drive the displaced liquid oil to the production well. The hydrophobic side groups of different polymer molecules interact with each other and thereby generate additional viscosity by forming a polymer network see fig.
Enhanced oil recovery using alkalinesurfactantpolymer asp major. Polymers play major role in the enhanced oil recovery. However, dwindling reserves are forcing industry to manage resources more efficiently, while searching for alternative fuel sources that are sustainable and environmentally friendly. Chevron starts polymer injection at captain in north sea. In an offshore reservoir, polymer eor is designed to improve the sweep of existing water flood systems. A simple benefit analysis suggested that reduced injectivity may be a greater limitation for polymer flooding of viscous oils than the cost of chemicals. Chemical eor, and especially polymer flooding has experienced a major increase in the past few years. Polymer enhanced oil recovery oil and gas authority. Formulation of surfactants from coconut coir containing. Fundamentals of carbon dioxideenhanced oil recovery co2eora supporting document of the assessment methodology for hydrocarbon recovery using. Chemical methods of enhanced oil recovery surfactants to lower the interfacial tension between the oil and water or change the wettability of the rock. Enhancing polymer flooding performance 5 facts and figures about eor polymer.
Pdf polymer flooding is the most commonly applied chemical. Demonstrate that for new developments, eor scenarios should be considered early. Figure 11 the study of enhanced oil recovery project, by considering depth and api 5 figure 12 oil recovery rate in each method 5. This paper provides an update on the status of polymerflooding technology, focusing more on field. Eor methods based on polymer flooding, surfactantpolymer flooding and alkalisurfactantpolymer flooding are well established, but new challenges always. Of eor polymers spe 115142 randy seright, new mexico tech. Enhanced oil recovery abbreviated eor, also called tertiary recovery, is the extraction of crude oil from an oil field that cannot be extracted otherwise. Miscible displacement methods, which include injection of hydrocarbon gas, co 2, or inert gas under. Polymer flooding is the most commonly applied chemical enhancedoilrecovery technique. The rough estimation of profit or loss in oil recovered in relation to polymer injected shows that this polymer flooding project is profitable. Water flood and eor design, surveillance and optimisation. Historical and recent observations in polymer floods.
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