YOUNG SCIENTISTS, Awarded Science Achievement Certificates

Research Summary

The multi-scale three-dimensional positioning control system with the international leading level of has been independently developed, the automatic and rapid acquisition of seismic modeling data in the physical experiment have been realized, and the ultrasonic excitation, the laser reception technique have been overcome. The mobile sensing probes have been invented based on phase-shifted fiber Bragg grating sensor (PS-FBG) and a set of fiber grating vibration detection system with single point, wide band and high sensitivity based on fiber Bragg grating sensing technology have been successfully developed, which could combine with three-dimensional positioning and data acquisition system to form the seismic physical modeling technology with the international leading level based on fiber Bragg grating sensor. The sophisticated technology of three-dimensional seismic physical model making for the fractured-vuggy reservoir has been formed by blending the in-situ compound and polymer to realize the microscopic structure design and synthesis of fracture and vug, Meanwhile, the discontinuous Galerkin finite element method (DG-FEM) for seismic numerical modeling was developed. These achievements have been successfully applied to the complex surface in south of China and complex fractured-vuggy reservoir in west of China, which provide a strong support to reveal the seismic response of the rugged topographical model, complex tectonic zone and small scale fracture and vug.

Research Summary

The article considers the problems of forecasting balanced growth and ways to increase innovation activity Oil and Gas Industry. Presents an analysis of the existing control system, the estimation of branch structure of economy as the main issues that require urgent resolution. The purpose of this article is to describe the results of the model that allows to develop science-based forecasts of a system of indicators for the medium term, and implement on the basis of the results analysis of the balance development of the economy in the forecast period. Particularly important studies synthesizing in the approaches of mathematical modeling of complex systems and to systems analysis balanced development of the economy and its diversified complex with the purpose of obtaining an effective evaluation of the activities of the state. This abstract posted to the conference the 9th Input Output Workshop 2018 “The balance of the economy as a condition for the innovation activation: a system analysis and the experience of the Republic of Belarus ” to the conference. Research fields: scenario analysis.

Research Summary

The project is aimed at improving the technical diagnosis of gas pipelines by introducing modern technologies for continuous automated monitoring of the technical condition of the facilities. Research included the development of assessing methodology for the necessity of monitoring system application for natural gas pipelines; the concept of the monitoring system; the monitoring subsystems; software for the finite element analysis of stress – deformed condition of buildings, structures, equipment and gas pipelines. Will be developed: completed prototypes of the monitoring system, subsystems for monitoring the corrosion processes, hazardous geological processes, and the propagation of crack-like defects by acoustic methods; industrial sample of the monitoring system; a methodology for planning maintenance and repair of equipment and pipelines based on data obtained by monitoring systems; integrated data analysis from various monitoring subsystems to identify new diagnostic features. Some of the project results have already been implemented at the facilities of PJSC Gazprom. Implementation of the results of the development will lead to a risk-oriented approach to ensuring industrial safety, reduce costs of works on technical diagnosis and examination of industrial safety, will reduce the level of accident facilities.

Research Summary

Day by day automation is playing a larger role in human production activity. The main goal of automation is to develop and implement new control solutions that optimize processes by certain criteria such as environmental impact minimization, saving natural resources, improving product qualities, support and assistance to a person in the performance of professional duties. This work aims to apply the advanced process control application developed on special tool in order to calculate and maintain the optimal pre-mixed refrigerant concentration based on the ambient temperature. The optimal pre-mixed refrigerant concentration guarantees the maximization of efficiency of the whole pre-mixed refrigerant cycle, leading to minimization of the temperature of the refrigerated flow, taking in to account current restriction of the pre-mixed refrigerant compressor K-1440. One problem faced in maintaining optimum pre-mixed refrigerant compositions is that the refrigerant circuit is very large and the speed of vapor C1, C2 and C3 make-up is limited. Additionally, sudden changes of the ambient temperature result in large changes in the optimal composition. This makes it difficult to maintain optimal pre-mixed refrigerant concentration during all possible conditions. As a result, the second objective of this job is optimization of the APC application by the development of a pre-mixed refrigerant composition target correction algorithm based on the weather forecast.

Research Summary

Traditional petrophysical techniques are mostly applicable in the range of millimeters to centimeters, while characterization of micro- and nano-features enables improvement in quality of hydraulic stimulation. Within the framework of the industrial R&D project a collection of whole core pieces taken from a single exploratory well at the interval of Lower-Berezov gas reservoir were investigated by multiscale digital rock approach. In the result a set of 3D multiscale digital rock models of all common rock types of the formation was prepared.Quantitive analysis of the models allowed making several important conclusions on quality of the reservoir. First, the void space is represented by objects with characteristics dimensions in both micrometer and nanometer scales. Second, void space at microscale is represented by pores, while at nanoscale — by both pores and grain boundary channels. Third, different void types correspond to specific mineral associations; this, in turn, determines preferred directions for mechanical fracture propagation. Fourth, the studied lithological types of the reservoir rock will likely be efficiently stimulated by application of hydraulic fracturing technology.

Research Summary

Recently, Strain-based design (SBD) methodology for oil and gas pipelines has been widely proposed as an alternative for traditional stress-based design since oil and gas pipelines are often exposed to the large longitudinal plastic strains during installation and in-service operation. In the present research, in order to develop enhanced tensile limit strain evaluate for gas pipelines with a circumferential semi-elliptical surface cracked based on ductile instability. To do this, the fracture toughness characteristics of the actual pipe must be accurately evaluated. In the ASTM standard for measurements of fracture toughness, it is required to satisfy deep crack length and thick-thickness of fracture specimen to produce conservative fracture toughness since constraint effect. It has been well-known that there could be a large difference of fracture toughness between standard specimens and actual pipelines. The main reason is that thickness and crack length of pipelines are usually smaller than those of standard specimens. Therefore, finite element analysis was performed to provide SENT specimens size with a stress field of crack-tip similar to full scale pipe through Q-stress analyses. Secondly, crack driving force calculate through the detailed finite element (FE) analyses considering various variables such as geometry of defects, material properties and loading conditions. As a result, the limit tensile strain were determined of either crack initiation or ductile tearing, respectively using CDFD (Crack Driving Force Diagram).