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 industry and can be used during development of an oil deposit by depletion. The method involves cutting a casing in the required interval, running a string with a whipstock at its end into the casing cut interval, 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. After forming the process channels, flexible joints with filters are run in the string, in the same process channels, on an auxiliary string, one by one, using a whipstock, the filter openings being covered with acid-soluble material. The filters have an additional nozzle at the ends, with a diameter larger than the main one, used for feeding hot liquid or vapour. After the installation of the flexible joints with the filters into the process channel, they are disconnected from the auxiliary string, which is gradually removed from the hole for the installation of identical flexible joints with filters for running them into the following process channel. After the installation of the flexible joints with filters into the last process channel, acid is pumped into all process channels for the dissolution of the acid-soluble filter material.

EFFECT: increased efficiency of multilateral well operation.

2 dwg