| A typical gas field is a complex energy-consuming system that is connected according to a certain topological structure.Each energy-using link is related to each other,affected each other,and restricted each other.The system consumes a lot of energy.We need to carry out a comprehensive evaluation of the energy efficiency of subsystems of the gas gathering and transmission system to identify the weak links in the energy use of the system.In this paper,through the investigation and study of the literature on the comprehensive evaluation of the domestic and international gathering system,based on summarizing the application status of the comprehensive evaluation methods,taking the X gas field as the research object,the following aspects are mainly studied in depth:(1)According to the principle of establishing a comprehensive evaluation,a comprehensive evaluation system for energy efficiency of natural gas gathering and transmission system was established,and the benchmark values and calculation methods for each index were determined.The first-level index is the energy efficiency of natural gas gathering and transmission system,and five second-level indicators which are the well field system,booster system,desulphurization system,light hydrocarbon recovery system,dehydration system,gathering and transmission network system and gas field water injection system,as well as 49 three-level indicators corresponding to the second-level indicators were identified.(2)Through the HYSYS simulation of the X gas field dehydration system and the booster system,the influence factors of the dehydration system and the booster system are determined,and the quantitative analysis of the influencing factors are carried out.According to the HYSYS simulation,the related documents and standards,the influencing factors of the dehydration system and the booster system are determined.(3)Based on the established comprehensive evaluation index system for energy efficiency of natural gas gathering and transmission system,the relevant comprehensive evaluation methodologies are investigated and the rough set theory is finally used to determine the weights of the comprehensive evaluation system indicators.Then fuzzy membership functions and linear weighted methods are used to synthesize the energy efficiency of natural gas gathering and transmission system,and then based on vector machine theory,combined with genetic methods for parameter optimization,and finally using MATLAB software to establish a comprehensive forecasting model,cross-validation to find the optimal forecasting model.(4)In view of the energy consumption in the operation of the gathering system of X gas field,the main energy-saving and consumption-reduction measures are proposed for the wellsite system,booster system,dehydration system,gathering transmission network system and gas field water injection system.The paper carries out a comprehensive evaluation of energy efficiency of the natural gas gathering and transmission system,which helps to grasp the operation status of the gathering and transmission system,analyzes the energy efficiency of the gathering and transmission system and the main energy-consuming equipment,and provides basis for production scheduling and operation transformation of the gas field.The above research results have been successfully applied to the comprehensive evaluation of the energy efficiency of the X gas field gathering and transmission system,identified the weak links in the energy use of the system,verified its rationality and effectiveness,and gave corresponding results based on the simulation results. |
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