NUMERICAL CALCULATION OF A RESERVOIR PRESSURE ACCORDING TO DATA OF GAS-HYDRODYNAMIC TESTS FOR STEADY STATES
The problem of defining formation pressure according to the data of gas-hydrodynamic tests "flow rate-bottomhole pressure" is of great importance for gas production practice. On becoming classical, Yu. P. Korotaev's solution requires prior calculation of <i>A </i>and <i>В </i>filtration resistance coefficients which are later used for <i>P^, </i>formation pressure calculation. However, instruction for complex research of gas and gas condensate wells (R Gazprom 086-2010, p. 77) rightly notes that "calculation of <i>A </i>and <i>В </i>coefficients is recommended only in case of availability of a great number of dots (15-20), otherwise accuracy of the received values will be very low". In practice, the number of investigated steady-state conditions makes no more than 5-7 and is far away from the required number of 15-20 dots. Therefore, the problem of alternative method development for formation pressure identification that does not require prior calculation of <i>A </i>and <i>В </i>coefficients appears actual and important in practice. After formation pressure definition corresponding to the proposed method calculation of <i>A </i>and <i>В </i>coefficients can be made more accurately by means of application of standard methods of data processing obtained during gas-hydrodynamic testing of wells