Research On Structure Of Combined Hydraulic Energy Dissipating Device

In the process of oil and gas exploitation,due to the change of formation pressure,oil,gas and water are sometimes extracted together with the sand and cuttings at the bottom of the well.When the pressure at the wellhead is high,the high pressure desander at the wellhead is often used to solve this problem in order to prevent the impact of high pressure sand-bearing gas and liquid on subsequent pipelines and equipment.The liquid sand separated from the high pressure desander at the wellhead also tends to have higher pressures,which requires energy dissipation and pressure reduction in order to reduce subsequent pipe wear and clogging.With good energy dissipation effect,the hole plug type hydraulic energy dissipator can effectively decompress the downstream liquid path of the high-pressure swirling flow gas-liquid separator and place the hole plug type hydraulic energy dissipator in the pipeline to ensure the safe and efficient continuous operation of the pipeline.In this paper,by improving the structure and series distribution of hydraulic energy dissipator with hole plug,the influence law of different structure and series form on energy dissipation of high pressure pipeline is studied.In this paper,by using numerical simulation method,the structure of the in-tube series plug energy dissipation device is studied in detail,the influence law of different plug shapes,plug area and plug length on energy dissipation efficiency is analyzed,and the hydraulic properties of the in-tube fluid under different arrangement forms are explored and compared,and the optimal structure of the in-tube series plug energy dissipation device is obtained.The simulation results show that the energy dissipation efficiency of the plug is not affected by the change of the shape of the plug outlet.In this paper,the circle shape is selected as the plug shape.The area of plug outlet has a great influence on energy dissipation efficiency,which decreases with the increase of the area of plug outlet.The change of the plug length parameter t/d in the range of 0.2-1 has no effect on the energy dissipation efficiency and the maximum velocity in the tube.Plugging series can effectively improve the energy dissipation efficiency,and the energy dissipation efficiency increases as the number of plugging series increases.The energy dissipation efficiency and the maximum flow velocity in the tube will not be affected by increasing the spacing between holes and plugs to 4D.The hole plug in series is provided with the entrance Angle,and the energy dissipation efficiency increases with the increase of the entrance Angle,and the energy dissipation efficiency remains high when the entrance Angle is greater than or equal to 60~o.When the outlet Angle is added to the series hole plug,the energy dissipation efficiency increases with the increase of the outlet Angle,and the energy dissipation efficiency remains efficient.The energy dissipation efficiency of symmetrical series cavity plug energy dissipator decreases greatly after the entrance and exit Angle is added,which can not only enhance the structural strength but also reduce the maximum velocity in the tube,which has a great impact on the energy dissipation efficiency.Asymmetric structure holes plug in series,compared with symmetrical structure increases energy consumption rate,asymmetric structure with the entrance Angle will significantly reduce the energy consumption rate.In addition to the series form that the Angle of the inlet and outlet reduces the energy dissipation efficiency,the energy dissipation efficiency is improved by increasing the number of the series of plug type energy dissipators.Finally,four efficient energy dissipation schemes are obtained.In this paper,through the study of the series plug energy dissipation device in tubes,the influence law of the plug structure on the energy dissipation efficiency is clarified,the change law of the energy dissipation efficiency under different layout forms is understood,and the optimal structure of the series plug energy dissipation device is obtained,which provides a scientific basis for the design and optimization of the liquid energy dissipation equipment,and lays a foundation for the future engineering application of the energy dissipation device.