Multifunctional downhole flow circulation regulating device and regulating method

Abstract

This invention relates to the field of natural gas production technology and discloses a multifunctional downhole flow circulation regulating device and method. The multifunctional downhole flow circulation regulating device includes an outer cylinder, a plugging assembly, and a throttling assembly. A fluid channel is formed inside the outer cylinder. The plugging assembly includes a plugging element and a sliding element. A drainage channel is provided on the wall of the outer cylinder. The plugging element can cut off or open the fluid channel, and the sliding element can block or open the drainage channel. The throttling assembly includes a throttling element. Multiple flow holes are provided on the wall of the outer cylinder, and multiple throttling orifices are provided on the throttling element. The multifunctional downhole flow circulation regulating device provided by this invention achieves pressurized tubing installation, initial large-diameter drainage, adjustment of the throttling orifice opening according to wellhead pressure and production changes, and subsequent plunger gas lift through a single completion tubing string. This eliminates the need for multiple wireline operations to retrieve the throttling device and place the plunger clamp, solving the problems of numerous procedures and poor connectivity in current drainage and production processes.

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