Dual completion natural flow-natural flow

Dual completion natural flow-natural flow

Dual completion natural flow-natural flow is used for simultaneous dual oil production from two formations according to scheme: bottom – natural flow, top – natural flow.


Dual completion of oil through two parallel production strings.


  • Separate flow rate metering;
  • Infinite adjustment of buffer pressure of each formation;
  • Each formation pressure and temperature measurement;
  • Separate sampling from each formation without well stop;
  • Provision of deparaffination unit for each production string;
  • Master valves available at wellhead;
  • Emergency tubing disconnection from packer-anchor equipment;


  • Increased oil production by eliminating formations interaction;
  • Decreased drilling footage;
  • Double-lift wellhead allowing to explore one formation without stopping another;
  • Killing of each formation without packer unset;
  • (De-) installation with standard equipment and tools by workover crews;
  • Double-lift arrangement for production from one formation when the other one is idle;
  • Technological service provided by manufacturer: selection, production, installation, supervision and maintenance;
  • Package supply of subsurface and surface equipment;

Order reference


Technical specification

  • Casing ID, inch (mm):
  • not less than 6 5/8 (168)
  • Tubing OD, inch (mm):
  • from 2 3/8 (60)
  • Unit max. setting depth, ft (m):
  • up to 14760 (4500)
  • Max. pressure, MPa (Psi):
  • 21 (3045)
  • Type of downhole deparaffination unit:
  • automatic, semi-automatic

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