METHOD FOR DETERMINING DYNAMIC BOTTOMHOLE PRESSURE OF WELLS OF GAS DEPOSIT Russian patent published in 2025 - IPC E21B47/06 

FIELD: obtaining oil and gas from wells.

SUBSTANCE: disclosed is a method for determining dynamic bottomhole pressure of wells at a gas deposit, characterized by large deviations from the vertical, involving determination of the following parameters of the operating mode of wells in reference wells of the deposit: gas density, critical pressure, critical temperature, formation pressure and temperature, temperature distribution and average temperature along the well shaft. Said reference wells are grouped into three groups depending on length L of their horizontal part, respectively, for L<1300 m, 1300 m ≤ L ≤ 2500 m and L > 2500 m. For each of the above groups of reference wells there determined is linear dependence of gas pressure drop on change of gas flow rate along the well length. Annular pressure and temperature are measured at the mouth of the investigated well, and based on the above parameters of operating mode of reference wells there determined is bottom-hole pressure in vertical part of the investigated well by barometric formula. Average temperature along the well shaft is calculated as log-average of two values at the beginning and end points of the considered section of the well. Dynamic bottomhole pressure in the investigated well is determined taking into account the value hydrostatic pressure increment, the gas pressure drop value from the change in the gas flow rate and the pressure losses for friction along the length of the corresponding interval of the well.

EFFECT: high accuracy of determining dynamic bottomhole pressure for wells with length of up to 6000 m, characterized by high deviation from the vertical.

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