Optimum Design And Research Of Skid-mounted Dehydration Device In Shale Gas Field

2019 is the tenth year for China to officially launch shale gas drilling.After nearly a decade of exploration,the exploitation of shale gas in China has formed a certain scale,ushered in the acceleration of development.While shale gas development continues to progress,the construction of shale gas-related industrial chain facilities should also be promoted.Most of the existing shale gas processing equipment adopts a modular skid-mounted design,which basically meets the production needs.However,the shale gas mining process has the characteristics of large initial output,high pressure,large liquid production,late production,wellhead pressure,low liquid production,and no liquid production,but large scale,long-term low-load operation,skid-mounted device.Existing dewatering devices with low integration and loose layout,and some pipelines and equipments are mainly installed on site,can not meet the needs of shale gas mining,and need to be optimized and improved.In this paper,the 300×104m3/d shale gas TEG dewatering skid is optimized,and the simulation optimization of TEG circulation is carried out by HYSYS.According to the calculation result of TEG circulation quantity,the TEG regeneration system equipment,TEG supplemental pump,product gas separator,absorption tower,etc.are selected and optimized.After optimization and simplification,the TDG dehydration unit of 300×104m3/d scale has a one-time investment cost.Compared with the same scale dewatering station,the TEG dehydration unit will drop by more than 20%.On the basis of equipment selection and size optimization,the skid-mounted optimization analysis of the dewatering device is carried out.Analyze the current situation of domestic dewatering skid layout,introduce the current situation of dewatering skid layout and existing shale gas skid-mounted dewatering device;analyze the layout and pipeline of the existing shale gas dewatering device skid,and determine the main equipment The size and the specifications of the attached instruments,valves and their pipes,and the partition block to carry out the statistics of the instrument valves for the main equipment of the whole dewatering device;the optimized form of multi-line linear arrangement is used to determine the optimization target according to the actual situation.Two different methods were used to optimize the skid-mounted dewatering device.Firstly,the SLP method is used to design the whole dewatering device.Two layout schemes are evaluated for the two layout schemes by the factor evaluation method,and the scheme 2 is better than the scheme one.Then the genetic algorithm is used to optimize the equipment layout,and the MATLAB software is used.Solve the mathematical model,select 10 groups of programs to compare and analyze to get the optimal layout plan,adjust the optimized results according to the function and distance adjustment of each device,and finally determine the layout plan;finally,the area,operation convenience and capital The two optimization results were compared.The genetic algorithm was better than the SLP method.The area was reduced by 13.3%and the fund was reduced by 10.53%.According to the above research,the SolidWorks three-dimensional rendering is used to optimize the relative position of each device and instrument valve of the dehydration device before and after,and the details of the optimized skid block are displayed in all directions to provide reference for the construction of the dewatering device.