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Erosion-resistant downhole choke for sour gas well

A technology of anti-erosion and choke nozzle, which is applied in the direction of wellbore/well components, production fluid, earthwork drilling and production, etc. It can solve the problem of low hydrogen sulfide corrosion resistance, inability to meet the application of sulfur-containing gas fields, and affect gas production, etc. problem, to achieve the effect of improving the service life

Inactive Publication Date: 2011-11-16
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional throttle nozzle adopts a monolithic structure, which has low hydrogen sulfide corrosion resistance, and the throttle nozzle needs to be replaced frequently
Downhole choke nozzle replacement needs to pull out the pipe string from the well, which affects gas production
Conventional downhole chokes cannot meet the application in sour gas fields, and the corrosion of hydrogen sulfide to downhole chokes has seriously affected the gas production of gas wells

Method used

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  • Erosion-resistant downhole choke for sour gas well
  • Erosion-resistant downhole choke for sour gas well

Examples

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Embodiment 1

[0012] Embodiment 1: Taking an anti-erosion downhole choke nozzle used in a sour gas well as an example, it will be described in detail.

[0013] refer to figure 1 , The erosion-resistant downhole choke nozzle for sulfur-containing gas wells of the present invention includes: a nozzle sleeve 1 , a sealing ring 2 , a pin 3 , a nozzle body 4 and a bushing 5 .

[0014] Due to the different structures of downhole throttling nozzles, there are many names given to the nozzle cover 1 by technicians, and the function of the nozzle cover 1 is to fix the nozzle. The mouth cover 1 of the present invention is cylindrical, and the upper end of the mouth cover 1 is threaded. There is a center hole in the mouth cover 1, and an inwardly protruding annular step is arranged in the center hole of the mouth cover 1, and a nozzle body 4 is fixed at the lower end of the annular step in the center hole of the mouth cover 1.

[0015] The nozzle body 4 is in the shape of a cylinder, and the diameter...

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Abstract

The invention discloses an erosion-resistant downhole choke for a sour gas well, and the erosion-resistant downhole choke is used for downhole chocking of a gas well. The parent body of a jet nozzle is cylindrical and provided with a central hole; a bush is fixed in the central hole of the parent body of the jet nozzle through interference fit; the bush is provided with a central hole the diameter of which ranges from 2mm to 10mm; the length of the bush is equal to that of the parent body of the jet nozzle; the bush is made of hard alloy; a pin is fixed in a radial screw hole on the wall of a nozzle sleeve and used for fixing the parent body of the jet nozzle in the nozzle sleeve; an annular seal groove is arranged on the outer wall of the parent body of the jet nozzle; and a seal ring is arranged in the seal groove. In the invention, the traditional bush structure is broken, and the bush is made of an alloy material resisting erosion and impact, thereby prolonging the service life of the jet nozzle. In addition, the pin is used for fixing the jet nozzle, thereby preventing tubular columns from falling to the bottom of the well during descending.

Description

technical field [0001] The invention relates to the technical field of gas production in oil and gas fields, in particular to a downhole choke nozzle, which is an anti-erosion downhole choke nozzle suitable for sulfur-containing gas wells. Background technique [0002] Hydrogen sulfide is highly corrosive to downhole tools. The corrosion damage of hydrogen sulfide often manifests as local wall thickness thinning, corrosion pits or (and) perforation caused by pitting corrosion. Hydrogen sulfide can also cause hydrogen bubbling, sulfur Compounds stress corrosion cracking and hydrogen embrittlement. Hydrogen sulfide corrodes oil and gas equipment and steel in various ways. [0003] Downhole throttling technology is used in oil and gas fields in Sichuan without sulfur or slightly, low sulfur (H 2 S content<5g / m 3 ) gas wells have been widely used, and have achieved good technical, economic and social benefits. The traditional throttle nozzle adopts an integral structure, ...

Claims

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Application Information

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IPC IPC(8): E21B43/12
Inventor 佘朝毅尹强张华礼喻成刚李力李明
Owner PETROCHINA CO LTD
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