Downhole steam flow control device and string thereof

Abstract

The present application relates to a kind of steam flow control device in well, including center tube, it is provided with wedge groove and step portion;Cap, it is installed on center tube;Nozzle assembly, it includes nozzle seat and supersonic nozzle installed on nozzle seat, nozzle assembly is installed on wedge groove;Screen assembly, it includes screen rib and screen installed on screen rib, one end of screen assembly is sleeved at the step portion of center tube and the other end extends along center tube;Cap, one end is connected on cap and the other end is abutted on screen assembly, cap is in contact with nozzle assembly and compresses nozzle assembly;Lower retaining ring, it is provided on center tube and is connected with the other end of screen assembly.The present application also relates to a string with the above device.The present application can realize effective and accurate control of steam flow;Can play a protective role to oil well;And can realize the steam flow control of multilayer section.

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