FLOW ADJUSTMENT ELEMENT FOR ESSENTIAL DECREASE IN FLUID FLOW WHEN ITS CHARACTERISTIC IS IN PRESET RANGE Russian patent published in 2015 - IPC E21B34/08 E21B43/12 

FIELD: oil and gas industry.

SUBSTANCE: group of inventions is referred to flow adjustment element intended to adjust flow of fluid coming from the stratum to the well flow string with limitation of undesired inflow of water or gas. The element comprises flow passage area wherein essential pressure drop is ensured when value of the selected fluid characteristic is in the first range and permanent value of pressure drop is maintained when value of the selected fluid characteristic is in the second range. At that flow passage area includes sections. Each of the sections comprises inlet and outlet openings. Between the above openings there is tortuous flow path having longitudinal and radial components. Flow passage is ensured through tortuous path in each section of the flow passage area. At that change in Reynolds number may be provided for the required ranges.

EFFECT: improved reliability for fluid flow adjustment.

20 cl, 14 dwg