Throttle nozzle structure, high-sulfur-resistance fixed underground throttler and fishing method thereof

The invention discloses a throttling nozzle structure, a high-sulfur-resistance fixed downhole throttler and a fishing method of the throttling nozzle structure, relates to the technical field of natural gas extraction, and solves the technical problems that an existing throttler is long in pressure balance time consumption and the like. The throttling nozzle structure is installed at the throttling end of the fixing sleeve, an exhaust hole for communicating the inner surface and the outer surface of the fixing sleeve is formed in the position, located above the throttling nozzle structure, of the fixing sleeve, and a sliding sleeve for separating the inner end of the exhaust hole from an inner hole of the fixing sleeve through an elastic piece is arranged in the inner hole of the fixing sleeve. And the exhaust hole can be communicated with the inner hole of the fixing sleeve by changing the deformation state of the elastic piece. When fishing operation is carried out, high pressure at the lower end of the th