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Fixed downhole throttler

A fixed and restrictor technology, which is applied in the direction of mining fluid, wellbore/well components, wellbore/well valve devices, etc., can solve problems such as easy jamming, low natural gas, and non-wear resistance, so as not to wear easily , prevent hydrate blockage, and achieve the effect of energy saving and consumption reduction

Active Publication Date: 2020-02-04
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the proportion of natural gas in my country's primary energy consumption is far lower than the world's average level, and the dependence on foreign natural gas continues to increase. Therefore, it is imperative to develop and promote natural gas mining technology and supporting tools. A downhole tool that can throttle and reduce pressure and prevent hydrate blockage, can reduce wellhead pressure and realize energy saving and consumption reduction, etc. Traditional downhole chokes are mostly installed on the seat pup joint with compression spring block structure, which is easy to get stuck And not wear-resistant

Method used

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Embodiment 1

[0020] Such as figure 1 , figure 2 As shown, a fixed downhole choke includes a fishing head 1 and an outer cylinder 2. The fishing head 1 is connected to the upper end of the outer cylinder 2. The inner cylinder 3 and the central pipe 7 are sequentially sleeved inside the outer cylinder 2. The outer cylinder 2 The lower end is provided with an internal thread, which is connected to the outer wall of the central tube 7, and the inner tube 3 is arranged in the space between the outer tube 2 and the central tube 7; the end of the central tube 7 is connected to a nozzle 14 through a fixed sleeve 10; the inner tube 3 is provided with a plurality of threaded holes 302, and the threaded holes 302 are used to connect a telescopic mechanism, and the telescopic mechanism protrudes from the holes provided at corresponding positions on the outer cylinder 2.

[0021] In this embodiment, the telescopic mechanism includes a clamping block 4 and a clamping block base 6 , the clamping block ...

Embodiment 2

[0024] The difference between this embodiment and Embodiment 1 is that the nozzle 14 is provided with a tapered nozzle. The traditional choke nozzle is an equal-diameter inlet and outlet, and the throttling effect is low. The nozzle adopts a tapered mouth, which improves the ability of throttling and reducing pressure in the wellbore, and prevents hydrate blockage in the wellbore. In order to further improve the corrosion resistance of the nozzle, the tapered nozzle adopts hard alloy anti-erosion material. At the same time, a plurality of horizontal sand discharge holes are arranged in the middle section of the central pipe 7, and the horizontal sand discharge holes directly communicate with the outside, specifically, four sand discharge holes can be evenly arranged to improve the sand discharge capacity.

[0025] According to different well conditions, you can choose to put the choke into the wellbore by means of rope operation, or you can choose to throw it in directly by ha...

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Abstract

The invention discloses a fixed downhole throttle. The fixed downhole throttle comprises a salvage head and an outer barrel, the salvage head is connected with the upper end of the outer barrel, an inner barrel and a central pipe are sequentially arranged in the outer barrel in a sleeving mode, and a nozzle is connected to the tail end of the central pipe through a fixed sleeve; and a plurality ofthreaded holes are formed in the inner barrel, the threaded holes are used for connecting a telescopic mechanism, and the telescopic mechanism extends from a hole formed in the corresponding positionon the outer barrel. According to the fixed downhole throttle, a spring-type clamping block structure is adopted to achieve that the throttle is put into a seat short section, telescoping is controlled by a spring, shell jamming is not prone to occurring, wear-resistant materials are adopted, and wearing is not prone to occurring.

Description

technical field [0001] The invention relates to the field of oil and gas reservoir gas recovery, in particular to a fixed downhole choke. Background technique [0002] At present, the proportion of natural gas in my country's primary energy consumption is far lower than the world's average level, and the dependence on foreign natural gas continues to increase. Therefore, it is imperative to develop and promote natural gas mining technology and supporting tools. A downhole tool that can throttle and reduce pressure and prevent hydrate blockage, can reduce wellhead pressure and realize energy saving and consumption reduction, etc. Traditional downhole chokes are mostly installed on the seat pup joint with compression spring block structure, which is easy to get stuck And not wear-resistant. Contents of the invention [0003] In order to solve the above problems, the present invention proposes a fixed downhole choke, which includes a fishing head and an outer cylinder. A nozz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/12E21B34/06E21B31/00
CPCE21B31/00E21B34/06E21B43/12
Inventor 马辉运张华礼喻成刚江源李奎喻冰邓悟易德正缪云杨永韬艾志鹏
Owner PETROCHINA CO LTD