METHOD FOR KILLING HORIZONTAL GAS WELLS Russian patent published in 2024 - IPC E21B43/12 

FIELD: oil, gas and coke-chemical industry.

SUBSTANCE: invention relates to oil and gas industry, namely to technology of killing gas wells with horizontal end after hydraulic fracturing, due to provision of hydrodynamic equilibrium in the well-formation system using equipment for performance of works at controlled pressure. Method includes pumping of killing fluid to borehole bottom via tubing string, blocking of perforation interval by supply of blocking compound to horizontal borehole in volume required for overlapping of perforation interval zone. Then killing fluid is supplied, specific density of which is lower than specific density of blocking composition. At that, volumes of pumped killing fluid portions are calculated so that the height of the column of the killing fluid portion relative to the surface of the blocking composition in the tubing string is equal to the height of the column of killing fluid relative to the surface of the blocking composition located in the annular space. Pumping of killing fluid is carried out through coiled tubing string to the interval of the liner hanger with control of flow rate and gradual compression of the throttle. At the same time pumping is continued until the inflow is stopped and equilibrium is established in the well-formation system. Coiled tubing string is lowered into the horizontal section of the borehole to the borehole bottom with pressure control and throttle control. After that, the design volume of the blocking composition is pumped with simultaneous lifting of the coiled tubing string to the level of the liner hanger. Then liquid packer is installed.

EFFECT: increased efficiency of killing of gas wells with normal and abnormally high formation pressures.

1 cl, 11 dwg