METHOD OF HORIZONTAL BOREHOLE ATTACHMENT Russian patent published in 2020 - IPC E21B33/14 

FIELD: oil, gas and coke-chemical industries.

SUBSTANCE: invention relates to oil industry and can be used in cementing a casing string in a horizontal well. Proposed method comprises lowering the cementing assembly into drilled well bore consisting of column shoe and casing string, flushing the well at assembly lowering, pumping and pouring of cement slurry into annular space. Method includes preliminary determining sedimentation resistance of cement mortar and dimensions of channel in section of section of well after sedimentation of cement, percentage of swelling of granules from water-swelling material when reacting with cement filtrate. Prior to pumping cement slurry into the well, granules of water-swellable material with density lower than density of the cement slurry and swelling when interacting with the filtrate of the cement slurry are added to the well and in volume, allowing hermetically close channels in vault section of well after sedimentation of cement solution.

EFFECT: technical result is higher cementing efficiency by eliminating the formation of longitudinal channels in the section of the section of the horizontal well.

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