One of the chemical methods of stimulating the reservoir to increase the efficiency of the oil field development process is polymer flooding. This article conducted a feasibility study of the effectiveness of the application of polymer flooding technology in one field in Western Kazakhstan. This field is characterized by high viscosity of reservoir oil, water cut, and dynamic heterogeneity of the reservoir. World experience in the application of polymer flooding in analogous fields shows high technological efficiency. Presented results of the analysis of the experience of applying technology in analogous fields, physicochemical studies of polymers, filtration studies on bulk models, hydrodynamic modeling of polymer flooding and the expected cost-effectiveness of introducing the technology, as applied to the conditions of the Karazhanbas oil field with high viscosity of reservoir oil. The analysis based on the experience of applying polymer flooding in high-viscosity oil fields, laboratory studies and estimated calculations of the expected production in the sector geological and hydrodynamic model shows a decrease in water cut, an increase in oil production, and an increase in current and final oil recovery.

Ultrasonic technology is a cost-effective and environmentally friendly non-traditional method of enhancing oil recovery, which is of great interest to researchers and field production engineers. The integration of ultrasound with surfactants has been proven to be effective in increasing oil recovery by reducing salt adsorption in the fluid. Many studies focused on the water-oil phase behavior to determine whether ultrasound can actually reduce oil viscosity (fluidity). However, the phase behavior alone cannot answer this question. Therefore, the present study investigated the role of reducing oil viscosity with the use of ultrasound at different intense frequencies. For this purpose, ultrasonic processing of an unconsolidated model with sand placed in an ultrasonic bath was applied. As a result of a laboratory experiment, the viscosity during ultrasonic processing showed a significant decrease to 30% from the initial value of 138 MPa*s. The change effect was discovered in the physical properties of the studied oil-water compositions in electromechanical field variables of different nature. Based on the results of experimental work, a method was developed and tested for reducing the viscosity of high-paraffin oils. However, in the course of research, several manifestation features of these effects were revealed, suggesting their applicability in the processes of synthesis and destruction of heavy hydrocarbons. In this regard, the relevance of the study consists in the dependence of changes in oil viscosity on the type and parameters of electrophysical effects. The authors conducted a laboratory experiment to reduce viscosity, built a hydrodynamic model to determine its effectiveness for processing a single well, and built a model using COMSOL Multiphysics software. The technology of stimulating oil wells with high-power ultrasound has been applied in various onshore and offshore fields. The developer of this technology takes good care of their customers and maintains confidentiality in relation to linking their performance indicators to a specific field. However, extensive ultrasonic tests have been provided showing that oil production rises from 38% to 380% based on average barrel/day flow rates.

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This article provides a technical and economic assessment of the effectiveness of the application of physical impact on a productive formation in one of the fields in Western Kazakhstan. The world experience of using the technology of physical stimulation in the fields shows high technological efficiency. Also, in order to optimize oil production, as a result of physical impact, changes in oil viscosity, an increase in oil production and a decrease in water cut were calculated. All the Cretaceous horizons have good reservoir properties, however, the high viscosity of oil and poor consolidation of the rocks composing the horizons do not allow for the full recovery of the product. Determination of phase permeabilities in the oil-water system was carried out in laboratory conditions with joint stationary filtration. According to the calculations performed in order to optimize oil production, as a result of physical impact, the oil viscosity changed to a value of 430 cP from 700 cP, the value decreased almost 2 times. There is also an increase in oil production and a decrease in water cut.

Today hydraulic fracturing is proved to be the most reliable and effective method of well stimulation. Specialists of NGDU are performing hydraulic fracturing efficiently, taking into account the quality of wells selection, introducing mode of treatment in order to provide an optimal geometry of fracture and get the highest production index from every well. In spite of the fact that repeated hydraulic fracturing is widely spread and used, all works are narrow directed. Considering either treatment results or, vice versa, describe process design. In this work we tried to identify treatment mode dependence, which allows generating required geometry of the fracture in accordance with different factors and then, estimate obtained results of well production increase and incremental ultimate recovery. Refractured wells were chosen for qualitative assessment of hydraulic fracturing to estimate correctness of project modes and treatment result more exactly. It will also allow improving efficiency not only from refracturing, but also from first treatments.