1887

Abstract

Summary

An invented method of making nanoparticle-based emulsion system allows to create the water-in-oil type emulsion system with improved surface-activity and stability properties provided by presence of silicon dioxide nanoparticles with modified surface. Improved physical and chemical properties of the invented emulsion system provide the extremely high thermal stability (more than 140 C), unique rheology, selectivity of the effect, and make it possible to change the wettability of rocks surface. These properties allow to apply the nanoparticle-based emulsion system effectively in form of water-blocking agent widely applied for IOR methods.

Based on the results reached during deep R&D work the oilfield pilot tests have been done successfully. The pilot test results showed high efficiency of the new water-blocking agent application for intensification of oil production in high heterogenous carbonate reservoirs and in the reservoirs with water break-through. The results confirm the huge potential of the method for the new water-blocking agent expansion to other directions of the IOR area. As a result of the laboratory tests carried out during R&D stage the optimal concentration and most effective types of the silicon dioxide nanoparticles with modified surface were determined. The thermal stability was measured by using thermal oven for heating the samples for 90 and 140 C. The rheology tests were carried out, and unique properties revealed. Results of the optical rheology tests visually show a structure of the emulsion systems with nanoparticles and gives a basic data for comparative analysis of the differences in the structure of the classical emulsions and improved emulsion systems with nanoparticles. Core flooding tests of new emulsion system with nanoparticles showed unique combination of water-blocking effect with selectivity of impact onto oil saturated intervals.

All carried out tests are comparative, and the results confirm advantages of the new method for emulsion system generation. It was revealed that the presence of nanoparticle gives to the emulsion system unique physicochemical properties and the application of the new emulsion system as a water-blocking agent significantly increase the efficiency of the IOR methods in technological, economics and environmental aspects.

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/content/papers/10.3997/2214-4609.201900162
2019-04-08
2024-04-23
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