Anti-sand burying salvaging single-rubber barrel downhole choke

Abstract

The invention relates to an anti-sand burying salvaging single-rubber barrel downhole choke which is applied to exploit gas for an oil-gas well. The top of an upper central pipe is inserted into a central hole at the lower end of a salvaging head; a long hole of the salvaging head is relative to and communicated with a long hole of a mandrel; the wall of the upper central pipe is provided with a long hole; the outer wall of the salvaging head is provided with annular steps; the annular steps of the salvaging head are sleeved with annular assistant anti-sand rubber rings; an outer thread at the lower end of the mandrel is connected with a lower barrel body; the outer wall of the lower barrel body is sleeved with a cone, an adjusting nut and a spring; the thread on the outer wall of the lower end of the lower barrel body is connected with a guiding head; the upper end surface of a lower central pipe has a valve; a bolt is fixed into a bolt hole of the cone and penetrates through the long hole on the wall of the lower barrel body; and the lower central pipe is connected with the cone by the bolt. The choke has the functions of preventing sand burying and sand clamping, and is convenient for salvage; and the outer spring ensures stable and reliable work of the choke.

Description

technical field [0001] The invention relates to the technical field of natural gas production in oil fields, in particular to an downhole choke for controlling gas recovery and production in a natural gas well, and is an downhole choke for preventing sand burial and being able to throw and fish a single rubber tube. Background technique [0002] At present, downhole chokes have been applied in natural gas wells for natural gas production control. Chinese Patent Publication No. CN2471929Y provides a "downhole choke nozzle and fishing tool for choke nozzle thereof". Including rubber cylinder, seat seal tool, central tube, air nozzle cover, fishing head, slips, retaining ring, ceramic air nozzle, piston rod, spring, spring seat, upper framework rubber cylinder, rubber cylinder sliding sleeve, lower framework rubber cylinder , lower piston, cone, sand control inner cover and sand control outer cover. Special fishing tools are required for salvage. It can reduce pressure and t...

AI Technical Summary

Problems solved by technology

Existing chokes still have problems such as sand production from gas wells, which can bury the fishing head after accumulation of sand, resulting in the choke being unable to salvage; in addition, the central tube of the downhole choke is too long and the seal is not tight, which makes it difficult to release the jam.

At the same time, the downhole choke that can be cast with double rubber tubes has the disadvantages of long working stroke, and the upturning of the rubber tubes affects the fishing operation.

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