Russian Journal of Applied Chemistry, 2013, Vol. 86, No. 10, pp. 1515−1520.
Pleiades Publishing, Ltd., 2013.
Original Russian Text © K.I. Omarova, A.O. Adil’bekova, A.E. Kabdush , Zh.T. Eshpanova, 2013, published in Zhurnal Prikladnoi Khimii, 2013, Vol. 86,
No. 10, pp. 1559−1564.
OF HETEROGENEOUS SYSTEMS
Surfactant Polycomplexes in Displacement Processes
of Non-Polar Liquids from Porous Systems
and Demulsiﬁ cation of Reverse Emulsions
K. I. Omarova, A. O. Adil’bekova, A. E. Kabdush, and Zh. T. Eshpanova
Al-Farabi Kazakh National University, Almaty, Kazakhstan
e-mail: Kainzhamal.Omarova @ kaznu.kz
Received July 4, 2013
Abstract—The surface properties of the polycomplexes of the non-ionic surfactant OP-10 with synthetic poly-
electrolytes (polyacrylic acid, polymethacrylic acid, and polyethylenimine) at the water | (toluene + cyclohexane +
hexane) interface were studied. It was found that at the low relative concentrations of OP-10 in the mixture (n =
0.05-1) the decrease in the surface tension is maximal. The displacement rate of the oil from the capillaries of
different nature with aqueous solutions of various polyelectrolytes and OP-10 depends weakly on the nature of
the capillary. The coefﬁ cient of oil displacement from porous systems with aqueous solutions of polycomplexes
is higher by 18–25% than that of oil recovery with water. The study of the demulsifying properties of the poly-
complexes showed that the lifetime of the reverse emulsions, including oil emulsions, is sharply decreased for
large n values (n = 5–20).
At the present stage of development of the oil industry,
the problem arises to enhanced oil recovery (displacement
of residual oil with water). In Kazakhstan, the oil produc-
tion is intense enough and the amount of unrecovered oil
is growing with the development of new ﬁ elds. Numerous
pilot-plant tests in Russia, USA, Norway, Iran, and other
countries showed that the basic and efﬁ cient methods of
secondary oil recovery are the chemical methods.
The use of viscoelastic systems is referred to as the
ﬁ eld basis of oil recovery management. To the reagents of
new generation capable of increasing oil recovery belong
polymers, polymer–polymer complexes, and polymer gel
compositions [1, 2]. The main disadvantage of polymer
solutions is low surface activity at the interfaces and
tendency to mechanical degradation upon displacement,
accompanied by the deterioration of viscoelastic proper-
It is known that in oil reservoirs the oil components
are adsorbed on the surface of the rock-forming miner-
als, providing hydrophobization of pore channels of
oil-surrounding rocks and ensuring ﬁ rm contact with the
oil, which makes oil displacement with water difﬁ cult.
In this regard, solutions of the associates of non-ionic
surfactants and polyelectrolytes are interesting objects
. Polycomplexes based on non-ionic surfactants ex-
hibit high surface activity at various interfaces and act
as hydrophilizing agents on hydrophobic surfaces [5 , 6].
In the study, the chemical and colloidal properties
of the associates formed by non-ionic surfactants and
synthetic polyelectrolytes at a varied component ratio
As water-soluble polymers we used polyacrylic acid
(PAA ) with a molecular weight M
= (5.7–7.5) × 10
polymethacrylic acid (PMAA) with M
= 4.88 × 10
sodium carboxymethyl cellulose (Na-CMC), and poly-
= 3 × 10
). The non-ionic surfactant
was oxyethylated octylphenol of the general formula
Н (n = 10) of the OP-10 trade-
mark and the non-polar liquids, toluene, cyclohexane, and
hexane (all analytical purity grade). The oil was supplied
from the Kumkol ﬁ eld (Kazakhstan).