HYDRAULIC DEVICE FOR PLACEMENT OF GRAVEL FILTER INTERIOR COLUMN Russian patent published in 2016 - IPC E21B43/04 

FIELD: oil and gas industry.

SUBSTANCE: group of inventions is referred to development of gravel filters in oil and gas wells. When interior column is placed in the borehole assembly borehole medium is pumped through outlet port in the interior column, the interior column is moved through inner passage in the borehole assembly, at least partial fluid throttling is made through the outlet port in isolated space related to the first location in the borehole assembly, pressure growth in pumped fluid is detected in response to throttling, correlation of the first interior column location is performed relative to the first position the borehole assembly. The interior column is deployed in order to perform complete installation of gravel filter from nose to toe piece. Telescopic adjustment device ensures proper length adjustment of the interior column at running in to the assembly nose. Sealing surfaces of the location finder separate the isolated space and are sealed at sealing in the interior column set so that they move inside it.

EFFECT: improved efficiency of gravel filter development due to increased accuracy of borehole tools setting.

21 cl, 9 dwg