WELL FILTERS STRING AND METHOD OF WELL FILTERS STRING ASSEMBLY Russian patent published in 2010 - IPC E21B43/08 E21B43/10 

FIELD: oil-and gas production.

SUBSTANCE: group of inventions related to oil- and gas production and can be used for water, oil and gas production form subsoil. Well filters string includes filters, which have bearing frame, made of perforated pipe, and filtering element. Filters perforation has variable porosity along its height, increasing to its bottom part due to perforation holes diametre increase or due to quantity of holes increase. Before assembling, well filters marked in relation to their porosity and install according to porosity value decrease form bottom to top.

EFFECT: well filters string discharge capacity increase during operation in reservoirs with variable pressure.

10 cl, 9 dwg