About the movement equations of gas-condensate system in porous mediums and pipes nearby a pressure of condensate formation

Efficiency of technological processesof development and exploitation of gas and gas–condensate fields inseparably linked with a choice and an establishment thermohydrogasdynamic optimal aflow regime of liquid-gas mixtures accompanied, as a rule,by the nonequilibrium phenomena and phase transitions insystem of stratum–well–pipeline communications.Nonequilibrium processes and phase transitions in liquid–gas mixtures are revealed in sufficient wide range of pressure, including and areasabove and belowcritical pressure, thus, as a rule, relaxational propertiesof noted mixes depend both as on pressure level so and from change rate of pressure in system.Since under a movement of gas– condensate systems is a pressure decreasing, then in processof movement there can be a formation and growth of a new phase(on nano and micro levels) condensation, the part from which,as a rule, is takenout by a gas stream, and the part accumulates on pore walls or pipes, changing hydraulic characteristics of medium.
Materials and methods
1. Dependence of density of gas-liquid system on concentration of repeatedly formed new phase (on nano and micro levels) condensation is accepted on the basis of thermodynamic methods. The equation of a thermodynamiccondition for gas,and owing to the weak compressibility in comparison with gas density is also used,the assumption about constant density of liquid is accepted. 2. No equilibrium is dependent of concentration of liquid inclusions on level of pressure, describing condensation processes in gas-liquidsystem in the range from pressure of again formed new phase (on nano and micro levels) is offered Pc(at constant pressure)condensation (above noted pressure in gas completely there are no liquid inclusions), to pressure level whenthe system can't be considered as the homogeneous gas-liquid environment. 3. The nonlinearity of no equilibrium thermodynamic equation of a condition of the gas-liquid mix,describing condensation processesin gas-liquid system in the range from pressure of again formednew phase (on nano and micro levels)condensation, to a pressurelevel when the system can't be considered as the homogeneous gasliquid environment is formed. 4. The differential equation of an isothermal filtration of gas-condensate systems, taking into account effects in the field of formations of new phases (on nano and micro levels) condensation is received. 5. The system of the nonlinear equations describing isothermal processes of a current of gas-condensate systems in wells and pipes, taking into account formations of new phases (on nano and micro levels) condensation is received.
Сonclusions
The equations of movement of gascondensate systems in porous environments and pipes near the condensate formation pressure which can be used at the solution of specific engineering objectivesof control and regulation of formations of new phases (on nano and micro levels) condensation; for increase of efficiencyof various technological processes of gas production and gas condensate output layer are achieved.