Application research of plunger drainage and production control system based on effusion surface

The effusion height of gas well is one of the important factors affecting the efficient production of gas well. The real-time, accurate monitoring and comprehensive analysis of effusion surface are of great significance for gas well drainage and gas production. At present, the bottom hole effusion was analyzed and calculated by gas production and water cut analysis, pressure gradient method and critical flow method. The monitoring error of gas wells is large, which is difficult to meet the requirements of field production. Therefore, a plunger drainage and production control system based on the effusion surface was developed. The system continuously monitors the casing effusion surface by acoustic method, and WIFI wireless data is transmitted to the monitoring and calculation platform. Through the height of the effusion surface and the gas well temperature, the compression factor z is introduced to establish the calculation model of bottom hole pressure, and calculate the height of the effusion surface accurately in real time to ensure the efficient and stable production of effusion by the plunger. The system realized the real-time monitoring, analysis and calculation of bottom hole pressure and effusion surface height, and had high application value for the efficient production of natural gas.