FIELD: oil and gas production.
SUBSTANCE: procedure consist in lowering production string with back valve and string shoe into well. Cement grout is pumped into annular space through a filling string till it emerges at a wellhead, further, it is pumped creating round circulation. Also, the filling string is equipped with lower and upper sealing units. Lower sealing unit pressurisation is performed by selection of adjustment branches to equip the filling string with the upper sealing unit and to achieve pressure tightness.
EFFECT: raised quality of stabilisation of wells under complicated mining geological conditions due to reliable annular space sealing; also, reduced labour input of process.
2 dwg
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