Polymer/surfactant
combination solutions were easy to suffer chromatographic separation
effect when injected into a relatively low permeability reservoir
for the poor injection ability. In addition, the long chain polymer
molecules are easy to be cracked when passing through the porous media
with low pore throat radius. These problems limit the polymer/surfactant
combination flooding used in the poor reservoirs for enhanced oil
recovery (EOR). The conventional viscoelastic surfactant (VES) is
mainly used in fracturing or drilling. In this paper, we present a
novel viscoelastic surfactant, VES-JS, which is designed for EOR.
It has a unique ability that allows it to have viscoelasticity like
the polymer solution and the capacity to deduce the interfacial tension
(IFT) value of oil and water to order 10–2 ∼
10–3mN/m. For the self-assemble ability, it can
reform network structure when it stiff in the porous media. Under
the reservoir condition, 65 °C, 100 × 10–3 μm2, VES-JS shows good viscoelasticity and ultra
low IFT which can improve the displacement efficiency. An experimental
investigation of VES flooding was conducted by a series of core flooding.
The effects of reservoir permeability, VES concentration, injection
rate, injection volume, injection time, and reservoir heterogeneity
on displacement efficiency were evaluated. The results indicate that
under the experiment conditions, VES flooding can improve oil
recovery ratio from 10.64% to 24.72%. Moreover, under the comparable
experiment conditions, VES flooding can get recovery increment 17.18%,
while polymer flooding is 10.56% and surfactant flooding is 8.64%,
which is close to the ratio of the polymer/surfactant combination
flooding 17.35%. These exciting results show a strong potential for
the VES used in relatively low permeability reservoirs for EOR.
ing new MOFs and developing novel eco-friendly electrochemical synthesis methods for MOFs' application in environmental analysis. Moreover, the applications of MOFs in environmental analysis field in recent years were comprehensively illustrated and the advantages and disadvantages of electrochemical synthesis methods to prepare MOFs as environmental analytical nanomaterials were evaluated. Finally, some suggestions for the optimization of electrochemical synthesis methods for MOFs and their future opportunities in environmental analytical applications were proposed.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.