Stability studies of dispersed systems for physicochemical methods to enhance oil recovery in the presence of a hydrophobic filler

Abstract

As the formation of highly permeable zones in the reservoir results in progressive watering of the produced products, restricting the movement of the oil displacement agent is one of the main conditions for further improving the effectiveness of methods for influencing oil-saturated formations. This can be achieved by targeted tamponing with physicochemical compositions of highly conductive channels and artificial fractures. In most cases, there is a redistribution of flow and, as a result, previously undrained reservoir intervals are brought into production.

The effect of tamponing is best achieved by the use of dispersed systems containing various fillers. The use of such technologies is regulated in many documents used in the work of oil and gas producing enterprises. The formation of a high-quality water barrier in such technologies depends on the stability of the working composition.

The article is devoted to the study of the influence of filler hydrophobicity on the sedimentation and aggregation stability of dispersed systems. The conditions under which the systems show the least tendency to sedimentation and are aggregatively unstable are considered. It has been shown experimentally that the stability of the systems is influenced by the hydrophobic properties of the filler, which do not allow the particles to enter the aqueous phase, swell and precipitate, thereby reducing the sedimentation stability. It has been shown experimentally that the systems composed of NaQMC or PetroPam P-104 have similar indicators for the time of onset of mass deposition of particles, their average calculated deposition rates as well as viscosity characteristics.