@Article{sl.2013.009.119,
AUTHOR = {Zhao Hua, Meiqin Lin, Zhaoxia Dong, Zihao Yang, Mingyuan Li, Jie Yang, Xiuling Ji},
TITLE = {Experimental Study on the Deep Profile Control and Oil Displacement Technology of Nanoscale Polymer Microspheres},
JOURNAL = {Structural Longevity},
VOLUME = {9},
YEAR = {2013},
NUMBER = {2},
PAGES = {119--129},
URL = {http://www.techscience.com/sl/v9n2/42908},
ISSN = {1944-6128},
ABSTRACT = {In this paper, scanning electron microscopy (SEM), dynamic lighting
scattering (DLS) and HAAKE rheometer experiments were adopted for investigating on the shape, size and rheological property of nanoscale polymer microspheres.
Besides, nuclear-pore film filtration, sand packed tube displacement and core displacement experiments were also adopted to study the mechanism of deep pro-
file control and oil displacement of nanoscale polymer microspheres. The results
demonstrated that the original shape of the nanoscale polymer microspheres were
typically spherical with a size range of 30-60nm. When the microspheres were dispersed in water, the grain diameter of them increased by 3-6 times due to swelling
and the poly-dispersed system appeared but the conformation of microspheres still
kept spherical. In a certain range of shear rate, the microsphere dispersed system
with the concentration of 100-900 mg/L showed apparent shear thickening behavior
and would be favorable for increasing the flow resistance of displacing fluid. These
microspheres dispersed systems exhibited effective plugging on 0.4µm pore-size
nuclear pore film and deep plugging in core and had a higher tendency to form
effective plugging to the high permeability layer and drive crude oil of the low permeability layer in parallel sand packed tubes. Cross-linked polymer microspheres
could reduce water permeability because microspheres were adsorbed, accumulated and bridged in the pore-throat and the adsorbed layers would be collapsed
by pressure and entered into reservoir deeply owing to microspheres’ good deformation property. Meanwhile these microspheres would drive crude oil on and in
pores/throats while they transported in porous media and thereby achieved the coordinated and simultaneous effects of deep profile control and oil displacement and
the ultimate purpose of improving oil recovery.},
DOI = {10.3970/sl.2013.009.119}
}