Post-evaluation And Operation Optimization Study Of The Dupont 30 Dewatering Station

The natural gas produced from the formation contains some water. The natural gas with water will cause great harm to the gas gathering system, so the dehydration of natural gas is the primary problem for the gas gathering system. Because the general separation device can only separate the free water of the natural gas, which can not separate the saturated steam of gas, it must be fed into the special dehydration equipment in order to reach the pipeline standards.Based on a year of tracing investigation of western Sichuan gas field Xindu block's pressurization and dehydration project of SINOPEC southwest oil & gas company, this paper collects a large number of basic operational data. On this basis, this paper evaluate the Xindu gas field and Dupeng 30 dehydration station and finds some problems which the gas field faces, such as the gathering and transferring difficult which is caused by low pressure, high energy consumption of the dehydrating station, the big loss of triethylene glycol because of foaming, exhaust smell distillation column lets out, etc.Through the analysis of western Sichuan gas field Xindu block's gathering pipeine situation and production problems, this paper puts forward two solutions for the gathering problem of Xindu block's low pressure wells. One is building a new gathering pipeline, and the other is building a pressurization station. This paper simulates the gathering process of all the low-pressure wells using TGNET software, compares two kinds of schemes"s economic and chooses the scheme of building a pressurization station. On this basis, this paper chooses the appropriate pressurization equipment and forms the pressurization station's construction scheme.Aiming at the problem of high energy consumption of Dupeng 30 dehydration station, this paper establishes Hysys model and analyzes the energy consumption of TEG dehydration station are TEG circulation system and triethylene glycol regeneration system, and the main energy consumption is triethylene glycol reboiler. On this basis, this paper analyzes the influenc of eight operating parameters on the energy consumption of reboiler and gets the main factors is the flow of triethylene glycol circulation and the reboiler temperature. The flow of stripping gas is the main factor that influences the energy consumption of gas equipment,and the flow of triethylene glycol circulation is the main factor affecting the energy consumption of TEG circulation system.Using the optimization theory and aiming at features of minimum cost of energy, this paper establishes the mathematical model and solves the model adopting extreme learning machine (ELM) network and genetic algorithm. Under the constraint condition of the water dew point greater than 10? and less than 5?, this paper gets the lowest energy consumption unit operation parameters.On this basis, considering the change of the western Sichuan region's temperature, Dupeng 30 dehydration station's operating time of a year is divided into two seasons.This paper analyzes the optimal operating parameters under the condition of the water dew point greater than 0? less than 10? and compares running cost of using winter and summer operating parameters.Finally, considering Xindu gas field's production change, this paper does the adaptability analysis of Dupeng 30 dehydrating station and gets the optimal operating parameters after the production. At the same time, this paper solves the problems of the glycol foaming and exhaust smell.Through the study of the parameter optimization of Dupeng 30 dehydration station, the energy consumption of device unit is reduced by 17.8%,which ensures the devicee's operation is fficient, safe and economic.