METHOD OF DETERMINING THE DYNAMIC BOTTOM PRESSURE OF A GAS-CONDENSATE WELL Russian patent published in 2019 - IPC E21B47/06 E21B47/10 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil and gas industry, and in particular to methods for calculating the dynamic bottomhole pressure in gas condensate wells. Method includes determining the flow rate, the relative density of the gas-condensate mixture, the wellhead values of pressure and temperature, the actual values of the hydraulic resistance coefficient, with the descent of the depth gauge to the middle of the perforation interval. On the basis of the obtained actual values of the hydraulic resistance coefficient, a graph of the dependence of the actual impedance on the flow rate of the gas-condensate mixture is plotted, with its help the empirical value of the hydraulic resistance coefficient is determined, taking into account that determine the dynamic bottomhole pressure according to the mathematical formula: where R_b – bottomhole pressure, MPa; R_w – wellhead pressure, MPa; S_v=0.03415ρL_vert/(T_avgZ_avg); S_l=0.03415ρL_l/(T_avgZ_avg); L_vert – vertical depth of the well, m; L_l – well depth along pipe length, m; Q – gas condensate mixture flow rate, thousand m³/day; ρ – relative density of gas-liquid mixture; T_avg – the average temperature in the wellbore, K; Z_avg – the average value of the super-compressibility; d – tubing diameter, m; λ* – the full coefficient of hydraulic resistance, depending on the flow rate of the gas-condensate mixture.

EFFECT: technical result is to improve the accuracy of determining the dynamic bottomhole pressure.

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