Transportation, storage, pipelines
One of the priority directions of scientific and technical PJSC “Gazprom” is to improve the technology gas trunkline by finding and developing new ways to get added value of natural gas saving.
To maintain the efficiency of gas mains to carry out spot repairs on the results of in-line inspection. In recent years, in PJSC “Gazprom” a significant rate being diagnostics and repair of trunk pipelines.
During repair work on gas pipelines is a very urgent problem of rational use of the gas pipeline section to be disconnected. In general, according to official statistics, emissions of road works 75% of total emissions by the PJSC “Gazprom”.
Development of gas to gas-compressor units are always justified in referring to providing pumping large volumes of gas availability possible the widespread use of this method without additional variable operating costs. The lower the pressure at the outlet the compressor station, the more will reduce the gas pressure shut down for repair of the gas pipeline and therefore achieve the greatest depth of the development of gaz. It should take into account the operating conditions of an opportunity of stable work of gas pumping units in unsteady regime that is in the fall of the inlet pressure to the minimum allowable value of creating the lowest possible outlet pressure gas compressor units.
In this, based on experimental data solved the complex problem of the development of gas and two heterogeneous working “in parallel” aggregates and reduce the emission of methane into the atmosphere.
MEASURES TO IMPROVE ENERGY EFFICIENCY TECHNOLOGICAL PROCESS LINEAR INDUSTRIELLE SENDING STASJONER (LPDS)
Currently relevant is the question of enhancing the efficiency of the main oil pipelines.
The share of energy costs in the pipeline transport of oil is 30% and this figure continues to grow. This growth is caused by the increase in oil production and a correspondingly increased volumes. The dependence of energy consumption in freight rail turnover is a power-law dependence. Therefore, with an increase of turnover of oil specific energy consumption is not reduced, but increases in proportion to the turnover to the extent of 1.75. For this reason, it is necessary to carry out activities for energy efficiency and energy savings.
The primary power consumer in the pipeline transport are pumping units at OPS and LPDS. When monitoring operational characteristics of pump units is possible, energy savings of 9 to 21 % of the costs of energy for oil transportation: the upper point is due to structural changes in pumps, the lower only through the maintenance of the units in their actual condition.
Comprehensive monitoring of the technical state of each pump unit one step closer to the technology improvement of trunk pipeline transportation of oil.
The article describes the technical energy saving measures to improve energy efficiency of technological processes LPDS, developed and justified measures to improve the energy efficiency of pumping units.
In the article the analytical solutions for the increasing of accuracy of technological flows discharge by using stationary flowmeters are proposed. The calculations are realized for determination of heat system water discharge.
The data base analysis by Kendal coefficient using is done. The result has shown the high level of statistical significance of correlation between the measurements of stationary and master flowmeters. For such the data base the measurements ranking methods may be realized.
This method realization is proposed in two variations. The first one is the searching of interrelation between the measurements of stationary and master flowmeters. In the article is shown, that the mathematical model based on independently ranked data, has higher accuracy than data base straight calculations. But this model can be recommended only for data base under normal distribution.
Otherwise the next variant is recommended – as nonparametric method with the principle of statistical series numerating. Every value has the own number. So the statistical series become ranking, and the every value number becomes its rank.
The both methods were realized for creating the model on the data base of heat system. The model describes the interrelation between the measurements of stationary and master flowmeters.
In the article is shown, that the realization of this methods increased the accuracy of discharge determination to 0,995.
In the article, the company pipeline transport of hydrocarbons is considered a system approach. On the basis of formal analysis concludes that the possibility of providing pipeline transport enterprise in the form of an integrated production system, in which staff interact, equipment and gas or oil. Further, based on the principles of interaction of system-wide production system “pipeline transport enterprise” and the Environment (entrostat) provides recommendations to improve the safety of this type of industrial production. Thus, increasing the degree of safety of operation of pipelines requires increasing the critical level of the organization, “the company pipeline transport” system as a whole, which is achieved by increasing its degree of openness. It is recommended to pay special attention to information transparency pipeline transport enterprises (meaning openness of statistics on accidents, openness to new ideas to improve safety and technology, interest in a comprehensive scientific study of companies operating pipelines, etc.). The conclusion is that all attempts to reduce the entropy of the system, “the company pipeline transport” (ie, to reduce the number of accidents) without increasing its degree of openness will lead to an increase in entropy of the system with its subsequent return to the level of critical value.
At the end of the article shows the results of the information and entropy analysis of technical systems “gas pumping unit”, operated in RAO “Gazprom” and “gasoline tank farm” is part of the business of mineral oil transportation.
Rational Software main transport natural gas in a reduction of gas mains load is accompanied by the increasing complexity of technology and the improvement of traffic management systems gas. An important role is given to the development of the system of dispatching management, one of the areas which is to implement the results of research evidence of system performance based on advanced mathematical models and technologies. Applied Information Systems are increasingly used in the problems of effective use of the equipment in the main gas transport.
Priority scientific and technical challenge of PJSC «Gazprom» is to improve the technology of gas trunk line.
In this regard, one of the most promising areas of research is the creation of mathematical models and methods of forecasting the volume of pumping natural gas through main pipelines for solving rationing problems and dispatching management planning. Developed earlier prediction technology focused mainly on the stationary conditions and the use of specific norms of consumption of natural gas for its own needs of compressor stations. Modern conditions of functioning of the gas transmission system characterized by a decrease in pumping volumes of natural gas each year.
In this paper we propose a method that allows to predict the volume of transit of natural gas through MG, taking into account the seasonal, daily and hourly unevenness of gas consumption (harmonic oscillation with random amplitudes and random phases).
To monitor the daily and seasonal hours the dynamics of gas consumption shows the possibility of presenting the dynamics of the volume of pumping natural gas through pipelines on the basis of time-series visualization in the form of fractal surfaces, which allows you to select components of the random time series.