GAS WELL OPERATING METHOD Russian patent published in 2018 - IPC E21B43/12 E21B33/03 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil and gas production industry, in particular to the operation of gas wells at the final stage of development, in which the gas flow rate is not sufficient to carry liquid from the bottom hole. Method is based on placing an additional central tubing string of smaller diameter in the main tubing of a gas well with the formation of an drill-string-casing annulus between two tubing strings. Gas is withdrawn simultaneously along the central tubing string and the drill-string-casing annulus. Gas is withdrawn from the central tubing string with a flow rate that exceeds the flow rate required to carry the liquid out. Gas flow rate through the annular space is set so that it does not exceed values of the work production rate. Flow meter is installed in the flow path from the central tubing string. In the flow path from the annular space, an automatic gas flow control valve is installed. Flows are combined into a combined flow line and point at the automatic gas flow control valve and to the flow meter. Electrical signals from the flow meter of the central tubing string flow and the flow meter of the combined flow are directed to the controllers of the automatic control complex. With the help of this complex, the obtained data are analyzed and instructions on automatic gas flow control valves are given to change their opening degree. This ensures the maintenance of the required flow rate along the central tubing string and the given total production rate of the well. Total flow rate of the well is controlled by an automatic control valve, which is installed along the combined flow line. This provides the possibility of autonomous automatic control of the total production rate of the well, regardless of the production control through the central tubing string. In a variant of the method, the gas is withdrawn from the central tubing string with a flow rate exceeding by 5–15 % of the flow rate required to carry the liquid out of it.

EFFECT: ensuring continuous removal of liquid from the gas well bores in order to eliminate the conditions for their self-pressing.

1 cl, 1 dwg