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Polymer flooding displacement mechanisms

One obvious mechanism in polymer flooding is the reduced mobility ratio of displacing fluid to the displaced fluid so that viscous Angering is reduced. When viscous Angering is reduced, the sweep efficiency is improved, as shown in Figure 1.2. This mechanism is discussed extensively in the waterflooding literature it is also discussed in Chapter 4. When polymer is injected in vertical heterogeneous layers, crossflow between layers improves polymer allocation in the vertical layers so that vertical sweep efficiency is improved. This mechanism is detailed in Sorbie (1991). [Pg.176]

Pusch, G., Lotsch, T, Muller, T, 1987. Investigation of the oil displacing efficiency of suitable polymer products in porous media, aspects of recovery mechanisms during polymer flooding. DGMK—Report, German Society Petrol. Sci. Coal Chem., 295-296, Hamburg. [Pg.589]

In this case, however, care must be taken that dispersive effects do not dominate the flow patterns Experimental work will be presented in the next section for both two phase and single phase displacement experiments which Illustrate polymer flooding displacement mechanisms ... [Pg.82]

The proceedings cover six major areas of research related to chemical flooding processes for enhanced oil recovery, namely, 1) Fundamental aspects of the oil displacement process, 2) Microstructure of surfactant systems, 3) Emulsion rheology and oil displacement mechanisms, 4) Wettability and oil displacement mechanisms, 5) Adsorption, clays and chemical loss mechanisms, and 6) Polymer rheology and surfactant-polymer interactions. This book also includes two invited review papers, namely, "Research on Enhanced Oil Recovery Past, Present and Future," and "Formation and Properties of Micelles and Microemulsions" by Professor J. J. Taber and Professor H. F. Eicke respectively. [Pg.879]

Earlier parts of this book have discussed the various aspects of polymer structure, stability, solution behaviour, in-situ rheology and transport in porous media that are relevant to their ultimate task of improving oil recovery. In this chapter, an attempt is made to pull these strands together by describing the main mechanisms of polymer oil displacement processes in reservoir systems. For this purpose, the main multiphase flow equations that may be used in the design and simulation of polymer floods are developed, along with some simpler solutions for certain limiting cases. [Pg.246]

Here the mathematical and experimental aspects of linear flooding will be considered. In this case, the only polymer flooding mechanism that may operate is the improved microscopic displacement that is possible when a lower viscosity drive water displaces a more viscous oil. First a simple mathematical fractional flow approach to analysing the improved oil recovery mechanism will be examined. Results from corresponding 1-D oil displacement experiments using water and polymer flooding are then presented in order to illustrate some of the points that arise. [Pg.251]

For a heterogeneity control polymer flood, since the recovery mechanism is 2-D in nature (cross-flow), it is simply not present in an oil displacement experiment in a 1-D reservoir core. Therefore, nothing can be learned from polymer flooding field cores if this is the proposed oil recovery mechanism in the pilot flood. Indeed, this could be positively misleading, since the local (linear) mobility ratio in the system could be close to unity and a waterflood... [Pg.331]

The main objective of this paper is not to present the case histories but to demonstrate some main characteristics of the displacement mechanism of polymer floods under different reservoir conditions. [Pg.311]

Recently, Wellington and Richardson [J5] presented an interesting paper discussing the mechanism of low surfactant concentration enhanced water flood. The surfactant system consisted of alkyl-PO-EO glyceryl sulfonate with small amounts of an ethoxylated cationic surfactant to control phase behavior, interfacial activity, and surfactant loss. The surfactant systems had the ability to reduce their cloud point and interfacial tension when diluted, which was regarded as very useful for an effective flood performance. A surfactant concentration of about 0.4% removed essentially all the residual oil from sand packs in just over f PV with a surfactant loss of less than O.f PV. Mobility control by polymer was strongly required for good displacement and sweep efficiency and to reduce surfactant loss. [Pg.236]


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