DEVELOPMENT METHOD BY HORIZONTAL WELL OF FORMATION WITH ZONES OF VARIOUS PERMEABILITY Russian patent published in 2013 - IPC E21B43/14 

FIELD: oil and gas industry.

SUBSTANCE: proposed method involves drilling of a horizontal well and cementing of a casing pipe to the formation roof, determination in the formation of zones with various permeability, lowering to the well of a pipe string with filters having the possibility of mechanical opening and closing from the inside, and packer from the outside, and installation of packers with disconnection of filters in an open shaft. According to the invention, packers are installed for disconnection of the formation zones with various permeability. Productivity and waterflooding of zones is determined by series opening and closing of filters located opposite the appropriate zone of formation. After that, zones with close permeability are determined by being combined into groups. Operation of wells is performed in turn in each group by opening the filters relating to the specified group and by closing the rest ones. At increasing waterflooding in one of the groups, a zone with maximum waterflooding is determined in it by subsequent closing and opening of the corresponding filters in the group. After that, the zone with maximum permeability is treated with water insulating compound, or the corresponding filter is completely shutoff. The well operation is continued in the specified mode. After process exposure of the zone treated with water insulating compound the influx is induced from that zone and operated with zones having permeability close to that one.

EFFECT: increasing oil extraction rate owing to involving in extraction of the formation products of zones with lower permeability and zones waterflooded during the operation after process treatment.

1 dwg