METHOD OF OPTIMAL OPERATION OF GAS AND GAS CONDENSATE WELLS WITH HIGH LIQUID CONTENT Russian patent published in 2019 - IPC E21B47/00 E21B43/22 

FIELD: soil or rock drilling; mining.

SUBSTANCE: invention relates to gas production and can be used in development of gas and gas condensate fields. Method provides for use of design model mathematically describing movement of gas-liquid flow in well, including in conditions of its foaming with surface-active substances (SAS), software implemented in computation module of autonomous industrial controller, allowing in continuous mode to determine completely unknown parameters of well operation, such as amount of condensation (distilled) water, which has passed into liquid phase from natural gas in upper sections of well shaft, flowing downwards along flow column or production tubing (tubing string) and accumulating at well bottom, amount of liquid gas condensate transferred into liquid phase from natural gas in upper sections of well shaft, flowing downward along the tubing string and accumulating on the bottomhole of the well, amount of water coming from the formation (or into formation), amount of liquid gas condensate coming from the formation (or into the formation), gas/carbonated gas separation depth in the wellbore, carbonated liquid/liquid separation depth in the wellbore, thickness of the water-cut part of the perforation interval (filter), which determines the well current productivity by gas and the well productivity by water, as well as use for self-tuning measured by appropriate equipment or in continuous mode to calculate temperature at well bottom, pressure at well bottom, gas flow rate, condensate-gas flow factor at wellhead, water-gas flow factor at wellhead, flow rate of hydrate inhibitor based on user-defined invariable parameters of well, such as formation temperature, formation pressure in area of well, depth of well to bottomhole, depth of bottom of tubing, depth of upper and lower marks of perforation interval or filter in productive formation, inner diameter of tubing string, internal diameter of production string or filter, angles of deviation of trajectory from vertical, type of well perforation, gas effective formation thickness, filtration resistance coefficients in equation of gas influx to well, mineralization of formation water, as well as parameters of the corresponding telemetering equipment in continuous mode and parameters coming to the controller, such as well head temperature, well head pressure, pressure in annular space of well, pressure at well bottom in case of packer operation, temperature downstream of gas flow rate regulator, pressure downstream of gas flow rate regulator, flow rate regulator of flow rate regulator id, and also allowing in continuous mode to predict well operation mode for a given period of time, including dynamics of all listed parameters, including in conditions of supply of liquid surfactant solution by means of corresponding equipment, depending on schedule of control parameters, such as set pressure in gas collection collector and type of used SAS, and depending on schedule of control parameters, such as the installed flow rate of the flow rate regulator, the installed surfactant solution flow rate, the SAS set concentration, as well as in the continuous mode interacting with the optimiser, allowing to perform adjustment of model parameters by dynamics of known well operation parameters and allowing selection of optimal schedule of control parameters for their transfer to controller as settings for control of control equipment.

EFFECT: method makes it possible to efficiently remove liquid from gas or gas condensate wells, providing stable extraction of gas.

10 cl, 4 dwg