Rapid assessment of deposit production capacity for determination of nanotechnologies application efficiency and necessity to stimulate their development

Abstract

The subject of research is the process of oil extraction from deposits of the Kushiro-Podolsk age of the Volga-Ural oil and gas province. These are the features of the objects: • poor reservoir properties of the formation; • high geological heterogeneity by various parameters; • closed deposits near oil-water contact surface; • fissuring and cavern porosity of different degrees; • wide ranges of values change for geological, physical and chemical properties of layers and fluids saturating them; • lenticular structure of reservoirs. Under these conditions the deposits development is often accompanied by: • intensive reservoir pressure reduction in the absence of water injection into the formation; • low initial production rates of oil wells and their subsequent substantial decrease within a fairly small period of time due to both reservoir pressure falling and rapid water inrush by lithological windows or by the existing cracks; • frequent lack of water injection into the reservoir effect of in the form of production rates increase in producing wells, that causes low reserves recovery degree, difficulties for application of secondary and tertiary methods of oil utilization, the high cost of the extracted product. Significant resources of these hard-to-recover oil reserves allow considering them as a good chance in hydrocarbon extraction. It is important to assess the need to stimulate the development of these fields. A key issue is the determination of extracted oil reserves and timing of development in reservoir operation on natural modes. Summing up the experience that concerns development of separate oil deposits being in service for a long time, a rapid assessment method for these indicators at the geologic exploration stage was suggested. Further technical and economic calculations make it possible: • to assess the necessity to stimulate the development of facilities similar to those studied by their geological properties; • to evaluate the efficiency of application of secondary and tertiary methods of oil recovery, including nanotechnological ones; • to determine the objects development strategy to increase the hydrocarbon resource base. These problems are proposed to be solved differentially by different groups of homogeneous objects not only in the Volga-Ural province but also in adjacent oil and gas provinces.

Keywords

• recoverable deposits; development period; oil; oil field;