Downhole throttle

Abstract

The application provides a downhole throttle. The downhole throttle comprises a central pipe, wherein a fishing-unsealing mechanism and a seat sealing self-locking mechanism are respectively arrangedat two ends of the central pipe, and a clamping seal mechanism is arranged between the fishing-unsealing mechanism and the seat sealing self-locking mechanism, wherein the fishing-unsealing mechanismcomprises a casing pipe, a support pipe, a Cavato part and a locking ball, wherein the casing pipe sleeves the central pipe, and connected with one end of the support pipe in a sleeving manner, the other end of the support pipe is in limit connection with the seat sealing self-locking mechanism, the Cavato part sleeves the support pipe and in limit connection with a hanging cap sleeving the casingpipe, the locking ball is arranged on the Cavato part in a limit manner through the casing pipe and the Cavato part and the support pipe are locked in the axis direction of the central pipe, and theclamping seal mechanism sleeves the side wall of the support pipe and is connected with the Cavato part and the seat sealing self-locking mechanism respectively.

Description

technical field [0001] The present application relates to the technical field of downhole throttling and heat preservation tools for gas well production, in particular to a downhole throttle. Background technique [0002] At present, gas well production mainly relies on formation energy to maintain production, so as to avoid the use of external energy and power to achieve the purpose of saving energy and reducing consumption and improving economic benefits. It is raised to the ground, but the cost of long-distance high-pressure transmission on the ground is high and unsafe, and the terminal of the gas well cannot be used. If the ground is depressurized and then transported, the sudden pressure loss of the gas at the wellhead will absorb and take away a large amount of heat energy, causing the water vapor absorbed by the wellhead to freeze rapidly and unable to continue production. This requires a series of heat supply systems on the ground to ensure that the wellhead does no...

AI Technical Summary

Problems solved by technology

[0004] However, the common problem existing in several choke valves in China is that they cannot be lifted up to release the blockage when they encounter obstacles during the process of going down the well. Low, when it is necessary to replace the air nozzle of the restrictor, a considerable part cannot be removed for replacement

The main reason is that the principle of setting is that the slips are lowered against the inner wall of the tubing and set when they are lifted up. As a result, the existing choke can only be lowered and cannot be lifted up. When salvaging and unsealing, the slips are required to be loosened first. However, the slips themselves occlude the inner wall of the tubing and are not easy to release, which affects the overall promotion of throttling and decompression technology in oil production and natural gas wells.

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