Study On Self-propelled Plunger Optimization Design And Continuous Drainage Gas Recovery Process

Gas well product water has been an inevitable phenomenon in natural gas production.The generation of wellbore effusions will have a great impact on the normal production of gas wells,severely reduce the efficiency of natural gas extraction and accelerate the shutdown of gas wells.The plunger lift gas recovery process has been widely used in gas fields such as Changqing Gas Field and Sulige Gas Field in China.At present,the existing plunger are designed mainly for its high velocity of falling,but there is an inability to control the amount of lifting liquid in each work cycle.In view of the shortcomings of the existing plunger tools,this paper describes a pressure sliding sleeve controlled gas well continuous drainage gas recovery plunger tool.The main research contents of this paper are as follows:(1)To investigate existing literature and patents for plunger tools in China,sum up the existing design of plunger tools,and summarize existing deficiencies in plunger tools;(2)Using SolidWorks software to complete the structural design of the new plunger tool and establish a three-dimensional model of the designed plunger;(3)Fluent fluid simulation software was used to simulate the flow field of the designed plunger outer wall seal structure,and the optimal value of the plunger seal structure size was obtained,which provided a theoretical basis for the design of the plunger seal structure;(4)The process of the designed plunger tool was studied,and the putting and salvaging flow of the designed plunger tool was given.The differential equation of the movement process of the plunger in the wellbore was established,providing a theoretical method for optimizing the production parameters in detail.