Deep Analysis Of Gas Condensate Fluid Monitoring Study

YKL and DLB, as the representative of the deep gas condensate reservoir, have a depth of over5000m.With the formation energy of diminishing in the depletion development mode, we faced with a prominent problem in gas production:With the pressure and production continue to decline, liquid loading problem becomes more and more prominent as a result of while/bottom water coning into the wellbore. However, it is so difficult to make a pre-judgement about liquid loading situation and effusion depth in deep gas condensate wells in the influence of the pressure gauge deepness and column packer, etc. that we delay the timing of the best liquid discharge.Wellbore pressure prediction model of deep gas condensate wells was established in the conditions of high and low gas-liquid ratio for deep gas condensate field above.The calculations showed that:in view of the phase and wellbore without effusion, the pressure calculated results were in good agreement with the measured ones.We concluded that the wellbore of low gas-liquid wells mainly had slug flow by conculating and analyzing the borehole flow pattern of the deep gas condensate wells such as DLB,which matches the results of this analysis results of the foreign scholars.Critical velocity distribution of deep gas condensate wells were studied, indicating that the difficult parts of the wellbore carrying liquid could be at the bottom of a well, might also be at the wellhead, or even another location in the wellbore, which needed be calculated and determined according to the actual production data.We commended the corresponding wellbore fluid discrimination method by analysing and confirming many wellbore fluid monitoring and judging methods according to the features of Yakela and Dalaoba:the modified ellipsoidal liquid drop model method was commended to determine the wellbore fluid for high gas liquid ratio wells and we used the approximation method to correct the ellipsoidal liquid drop model,whose selected correction factor k=1.1was in line with deep gas condensate wells actual such as Yakela and Dalaoba;the method "liquid holdup comparative law and wellhead flow pattern auxiliary judgment law" in the paper was used for low gas liquid ratio wells to judge whether there was liquid loading.The liquid loading situation of YKL and DLB was predicted in means of the established critical velocity model and effusion prediction method,meanwhile it guided the production successfully.