**10. Instead of conclusion**

The presented probabilistic approaches allow us to research different problems for providing safe and effective development of hydrocarbon deposits and rational operation of oil and gas systems. Their application in the system's life cycle helps to answer the main question. "What rational measures should lead to expected effects without wasted expenses, when, by which controllable and uncontrollable conditions and costs?" The efficiency from implementation is commensurable with expenses for system creation.

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Probabilistic Modeling Processes for Oil and Gas http://dx.doi.org/10.5772/intechopen.74963 79

[4] Kostogryzov A et al. Mathematical models and applicable technologies to forecast, analyze and optimize quality and risks for complex systems. Proceedings of the 1st Intern. Conf. on Transportation Information and Safety (ICTIS), June 30–July 2, 2011, Wuhan,

[5] Kostogryzov A, Nistratov A, Nistratov G. Some Applicable Methods to Snalyze and Optimize System Processes in Quality Management. InTech; 2012. ISBN 979-953-307-778-8 http://www.intechopen.com/books/total-quality-management-and-six-sigma/someapplicable-methods-to-analyze-and-optimize-system-processes-in-quality-management

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jpsra-2014-contents/

The probabilistic modeling, comprehensive and systematic studies on the competitiveness of OGS have been carried out in Gubkin Russian State University of Oil and Gas (National Research University) over a period of several years. These researches are concerned with the most important economic branch, which largely determines the country's energy security and efficiency. Certainly, the integral view of OGS competitiveness seamlessly includes the most important components of quality, safety, energy efficiency, environmental compatibility, economic aspects and so on. In turn, these components are also complex, integral and affect a wide range of activities. Moreover, competitiveness as a complex integral metric characterizes the studied considered systems and objects (as living organisms) that have the property of changes in the life time. The proposed probabilistic models and methods are widely used in the practice of education and research.
