CONSTRUCTION METHOD OF MULTIBRANCH WELL Russian patent published in 2012 - IPC E21B7/04 

FIELD: mining.

SUBSTANCE: construction method of multibranch well located in the shelf water area involves the ashore construction of the main well with large deviation of working face from vertical plane on the formation roof. Protective strings are installed in upper part of the main well; production string is arranged inside protective string of smaller diameter and equipped with a liner provided with filter on its lower end face. Then, a group of auxiliary wells with small deviations of shafts from vertical plane on the formation roof and with long horizontal shafts along the formation, which are directed towards the working face of the main well, is built in water area. Shafts of auxiliary wells are equipped with protective strings and liners on upper and lower end faces of which filters are installed. Filter of the main well and filters arranged on lower end faces of liners of auxiliary wells are located as close as possible to each other. Then, hydraulic interconnection between the main well and auxiliary well is achieved in location place of those filters using known methods, for example hydraulic fracturing. Sealing devices, for example plug packers, are installed on filters located on upper end faces of liners; after that, shafts of auxiliary wells are filled with grouting mixture till the water area bottom.

EFFECT: increasing the deviation of side working faces from working face of the main shaft.

4 dwg