METHOD FOR REMOVING LIQUID FROM WELLS AND BHZ BY HYDROPNEUMATIC SWABBING Russian patent published in 2021 - IPC E21B43/18 

FIELD: oil and gas mining.

SUBSTANCE: invention relates to the development of oil, gas and gas condensate fields, namely, to a method for removing liquid accumulated during operation in the bottom-hole zone of the formation. To implement a method for removing the accumulated or injected liquid from the bottom-hole zone of the formation (BHZ) and the borehole, the accumulated or injected liquid present in the pump and compressor pipe (the tubing) is cut off with a piston. The specified liquid is displaced to the surface by a piston and the technological sludge of the well is carried out in order to restore the level in the borehole due to the inflow of liquid from the BHZ. As a piston, a column of a gas-liquid mixture, GLM, is used, formed in the tubing by feeding GLM from the surface through the inter-tube space and the tubing shoe. The GLM column is displaced to the surface together with the cut-off liquid by compressed gas supplied to the inter-tube space.

EFFECT: providing the possibility of displacing the borehole fluid with a piston, which is a column of GLM, forced by compressed gas.

1 cl, 6 dwg