Movement mechanism experiment of top control fluid in compound perforation

A new similar simulation testing device of compound perforation was developed.The movement phenomenon of control fluid was observed under the different control fluid height and different high energy gas pressure by using this device,and the pressure curves and force that erects on control fluid were analyzed.The results show that the interaction between high pressure gas and control fluid is a very complicated process,which is the result that many factors act together.In the gas-liquid interaction process,the bottom gas pressure changes tempestuously,the higher the fluid column height is,the higher the gas pressure is,and the longer the time bottom gas pressure duration is.The force that erects on fluid column spreads layer by layer,the pressure wave decreases constantly due to the influence of fluid compressibility and friction with wellbore.Moreover,the method that installing an packer on the top of fluid column can promote the bottom gas pressure and pressure duration,increase the utilization of gas energy,however,instantaneous shocking high pressure will accompany with that.