METHOD OF SIMULTANEOUS AND SEPARATE OPERATION OF INJECTION WELL Russian patent published in 2013 - IPC E21B43/14 E21B43/20 

FIELD: oil and gas industry.

SUBSTANCE: method involves separation of formations in a well with a packer, pumping of liquid to each formation via its pipe string, interruption of pumping to both formations, continuation of pumping to the formation with high permeability and continuation of pumping to both formations. Strings at the well head are connected with a disengaged connection strap. First, maximum allowable requirements for pressure and intake capacity for low-permeability formation are determined. Interruption of pumping is performed after reduction of intake capacity and rise of pressure at the head of the pipe string interconnected with the formation with low intake capacity to maximum allowable requirements. Pumping to the formation with high intake capacity is performed owing to liquid flowing from the formation with low intake capacity via pipe strings through the connection strap till the wellhead pressure is equalised; after that, liquid residues are removed from the formation with low intake capacity to a movable tank in the near-wellhead zone.

EFFECT: possibility of restoring the intake capacity of the formation with low intake capacity without underground repair and overhaul of the well; excluding contamination of the water passage led to an injection well from a cluster pumping house with the contaminants escaping the bottom-hole zone of the formation.

1 dwg