ARRAY WITH BALL DROP AND METHOD OF ITS USAGE IN WELL Russian patent published in 2013 - IPC E21B23/04 

FIELD: oil and gas industry.

SUBSTANCE: method of actuation of a downhole tool includes the following stages: lowering of a string with a tool and an object moved by the flow and retained in the proper position in the downhole at the well bottomhole; increasing pressure of a fluid medium outside the string for release of the object; movement of the object in the flow and its further placement on the way of the flow for blocking of fluid medium movement; actuation of the tool in response of blocking of movement of the fluid medium. The method of packer installation includes the following stages: lowering of the packer to the well bottomhole; using a flow modulator of a drilling string for transfer of packer orientation data to surface equipment; orientation of the packer in response to the transferred data; introduction of an object into the central passage of the object for blocking of the fluid medium; installation of the packer in response to blocking of fluid medium movement. The well system comprises an object moved with the flow, a string, a tool driven by the object and a retaining device. The retaining device is placed in the string body and comprises a piston. The external surface of the piston contacts with the fluid medium outside the body. The retaining device is driven by pressure of the fluid medium for release of the object and blocking of the fluid medium flow, which puts the tool in motion. The well system described above, which also comprises a flow modulator and a packer and a tool of packer installation. The well system described above comprising apart from the listed a circulation valve. The retained object of this system is released in response to closure of the circulation valve.

EFFECT: reduced time of lowering by means of setting of initial position of a ball relatively close to a plant tool.