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Plunger tool for gas well drainage and gas recovery

A technology of drainage and gas production and plunger, which is applied in the fields of production of fluids, earth-moving drilling and production, wellbore/well components, etc., can solve problems such as poor adaptability, etc., and achieve high work efficiency, simple mechanical structure, and high work reliability. Effect

Active Publication Date: 2011-12-28
PETROCHINA CO LTD
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0009] The technical problem solved by the present invention is: to provide a plunger tool for gas well drainage and gas recovery, so as to improve or overcome the shortcomings of poor adaptability of existing plunger gas lift tools in high-inclination natural gas directional development wells

Method used

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  • Plunger tool for gas well drainage and gas recovery
  • Plunger tool for gas well drainage and gas recovery
  • Plunger tool for gas well drainage and gas recovery

Examples

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Embodiment 1

[0050] A flex plunger tool for 31 / 2" tubing (such as Figure 2A , Figure 2B shown) works in natural gas directional wells. The tool is composed of an instrument mandrel assembly 11 and a flexible plunger assembly 12, with an overall length of 1630mm and a maximum outer diameter of 72mm. Among them, the flexible plunger assembly 12 is mainly composed of a flexible central body 13, a plunger unit body 14, a top limit cylinder 15, a flexible body positioning joint 16, a top sliding sleeve 17, a top ferrule 18, and a top ferrule joint. 19. It is composed of compression spring 20, spring preload joint 21, bottom ferrule joint 22, bottom connecting sleeve 23, bottom ferrule 24 and bottom plug 25. The thermoplastic used in the flexible central body 13 is high-density polyethylene, and the structure is reinforced by winding metal wires. The flexible central body 13 has a diameter of 30 mm and a length of 960 mm.

[0051] The top limiting cylinder 15 has an outer diameter of 68mm a...

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Abstract

The invention discloses a plunger tool for gas recovery by liquid drainage in gas wells. The plunger tool is flexible, more specifically, the plunger tool comprises a flexible plunger assembly, which comprises a flexible central body, a plurality of plunger unit bodies connected in series are sleeved on the periphery of the flexible central body, and each two neighboring plunger unit bodies are in spherical contact with each other; when the flexible plunger assembly passes through a slant hole interval, the flexible central body is bent, each plunger unit body is displaced relatively, and the plunger unit bodies are still kept in spherical contact with each other. When operating in a wide-dogleg degree interval, the flexible plunger tool (12) receives the effect of the horizontal force of the inner wall of a tubing, the length of the flexible central body (13) is changed, the extension and retraction of the flexible central body are compensated by a floating mechanism on the top of the plunger tool (12), and thereby the flexible central body (13) is prevented from being damaged. The plunger tool overcomes the defects of the conventional rigid plunger, and improves the adaptability of the plunger lift technique to highly slanted directional wells.

Description

technical field [0001] The invention relates to a plunger tool, in particular to a novel gas-lift plunger tool used in the liquid drainage and gas recovery process of a high-inclination natural gas directional development well. Background technique [0002] In recent years, the development and utilization of natural gas has achieved rapid development. With the improvement of gas field recovery, many gas wells have entered the stage of low pressure and low production. The flow rate of the gas well is too low to reach the critical liquid-carrying flow rate of the gas well. Liquid accumulation gradually occurs at the bottom of the well, and the pressure of the wellbore increases, which eventually leads to the well being crushed to death and unable to produce. Therefore, it is necessary to adopt an effective liquid removal process to ensure the long-term stable production of gas wells. [0003] At present, a variety of liquid drainage and gas recovery technologies are used in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/00E21B47/01E21B47/12
Inventor 童征沈泽俊黄红梅薛建军郝忠献丁爱芹王新忠李明
Owner PETROCHINA CO LTD
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