METHOD OF MULTILATERAL WELL CONSTRUCTION Russian patent published in 2008 - IPC E21B7/04 E21B43/02 

FIELD: oil and gas.

SUBSTANCE: present invention relates to the oil and gas industry, namely to the construction of oil and gas well clusters. The method involves running a string with a whipstock at its end into the required casing interval, cutting a casing, gradually forming process channels around the casing perimeter using a flexible pipe with a nozzle at its end, the channels around the perimeter being formed by turning the whipstock. The casing is cut around the perimeter in the flexible pipe entry interval before the whipstock installation, and filters connected between themselves by means of flexible joints are installed on the external surface of the lower end of the flexible pipe before running the pipe into the well. The lower filter is connected to the nozzle, the upper filter being equipped with a packer on the outside. After forming each process channel and running all corresponding filters into it, the annular cross-section between the upper filter and the process channel is blocked with the packer. After that, the flexible pipe is disconnected from the filters with the nozzle and removed from the well. Identical filters with nozzles are then installed on the flexible pipe and the following process channel is formed. The remaining process channels are formed in the same manner.

EFFECT: increased efficiency of multilateral well operation.

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