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A downhole restrictor

A choke and main body technology, which is applied in the field of oilfield natural gas exploitation, can solve the problems of increased difficulty in downhole choke fishing

Active Publication Date: 2018-01-05
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem that the existing technology adds a certain degree of difficulty to the fishing of the downhole choke, the embodiment of the present invention provides a downhole choke

Method used

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  • A downhole restrictor

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Embodiment

[0031] The embodiment of the present invention provides a downhole choke, see figure 1 , the downhole choke includes a first central rod 1, a second central rod 2, and a discarding head 3, a cylindrical body 4, and a guiding head 5 connected in sequence. The first center rod 1 is connected to the second center rod 2, the body 4 is sleeved outside the first center rod 1 and the second center rod 2, and the axes of the first center rod 1, the second center rod 2, and the body 4 coincide One end of the throwing head 3 is connected with one end of the body 4 by a pin, the middle part of the body 4 is provided with a wedge-shaped projection 4a, and the outer diameter of the wedge-shaped projection 4a gradually increases along the direction from the throwing head 3 to the guide head 5. This restrictor also includes:

[0032] Back-up ring 6 is fixed on the end of the body 4 connected to the hand 3;

[0033] An elastic slip structure, the elastic slip structure is sleeved on the bod...

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Abstract

The invention discloses a downhole choke, which belongs to the technical field of oilfield natural gas exploitation. The downhole choke includes a first center rod, a second center rod, and a drain head, a body, and a guide head that are sequentially connected. The choke also includes a retaining ring, an elastic slip structure, and a wedge-shaped convex The upper seal between the block and the other end of the body, the lower skeleton, the lower seal, the seal start block, the spring, the limit stopper, and the second central rod are sequentially provided with first bumps along the direction from the throwing head to the guide head , The second bump, the sealing starting block and the body are correspondingly provided with a first through hole opposite to the first bump, the limit stopper and the body are correspondingly provided with a second through hole opposite to the second bump, the second Limiting pieces are respectively placed in the first through hole and the second through hole. The downhole choke provided by the invention can be smoothly fished out from the downhole.

Description

technical field [0001] The invention relates to the technical field of oil field natural gas exploitation, in particular to a downhole choke. Background technique [0002] During the process of natural gas entering the surface from the formation through the wellbore, if high pressure, low temperature and water content occur, hydrates are easily generated. The higher the pressure, the higher the formation temperature of hydrates, and the easier it is for hydrates to block, thus blocking the wellbore Production strings and surface pipelines affect gas well production. [0003] The downhole choke process installs the downhole choke at an appropriate position in the oil pipe, which can realize the throttling and pressure reduction in the wellbore. At the same time, the formation thermal energy can be used to heat the throttled low-temperature natural gas, reducing the throttled natural gas pressure and hydrate production. temperature, so as to prevent the formation of hydrate p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/12
Inventor 佘朝毅尹强喻成刚邓友超魏微杨云山李明
Owner PETROCHINA CO LTD
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