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Velocity pipe column two-stage plugging device and utilization method thereof

A technology of velocity pipe string and plugging device, which is applied to valve device of wellbore/well, earth-moving drilling, sealing/packing, etc. Conducive to reuse, wide application range and reliable sealing effect

Pending Publication Date: 2019-01-25
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, this technology mainly has the following problems: first, the process of removing the pipe is cumbersome, requiring a working machine to insert a plug into the pipe; second, the removed pipe cannot be reused

Method used

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  • Velocity pipe column two-stage plugging device and utilization method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A two-stage plugging device for a velocity pipe string, comprising an inner connection pipe 5 connected to the lower end of the speed pipe string 1 and a sand protection shield 8, the sand protection shield 8 is sleeved and fixed on the outer wall of the inner connection pipe 5, and the lower part of the inner connection pipe 5 is fixed with The guide head 13 is characterized in that: the side wall of the inner connecting pipe 5 at the top has an air inlet, and the upper slider 3 is slidably connected to the outside of the air inlet, and the upper slider 3 is connected to the inner through the shear gasket 6. The connecting pipe 5 is fixed, and the inner cavity of the inner connecting pipe 5 is fixed with an upper plug 7 and a lower plug 11 in sequence from top to bottom, wherein the lower plug 11 is fixed by the pin 12 and the inner connecting pipe 5, and the inner connecting pipe 5 below the lower plug 11 Air intake holes are arranged on the side walls and at the corre...

Embodiment 2

[0027] Such as figure 1 As shown, it is improved on the basis of Embodiment 1. The upper plug 7 is a structure with a round head screw in section, and the end of the upper plug 7 near the upper slider 3 is a hemispherical structure with a round head. Press the ball at the wellhead, the shear gasket 6 is cut under the pressure, and the upper slider 3 moves downward. When the upper slider 3 is locked with the upper plug 7, the upper plug 7 is connected with the upper slider 3 , realize the secondary plugging function, and ensure the smooth lifting of the velocity string out of the wellhead.

[0028] The upper slider 3 is a columnar structure with funnel-shaped openings at both ends, wherein the opening radius of the upper slider 3 near the end of the upper plug 7 matches the aperture of the hemispherical structure of the upper plug 7. The matching sealing effect of the upper slider 3 and the upper plug 7 is good, and the upper slider 3 is a columnar structure with funnel-shaped...

Embodiment 3

[0033] Such as figure 1 As shown, it is improved on the basis of Embodiment 1 and Embodiment 2. The inner connecting pipe 5 is rolled and connected to the lowermost end of the speed pipe string 1, and the lower end surface of the speed pipe string 1 passes through the sealing ring 4 and the sand protection shield 8 The upper end face is fixedly connected, wherein the sealing ring 4 is sleeved and fixed on the outer wall of the inner connecting pipe 5 . The rolling connection method is adopted, with small elastic deformation, good sealing performance, high yield strength and high connection performance.

[0034] The upper edge of the sealing ring 4 extends to the inner wall of the velocity string 1 and is fixed with the velocity string 1 , and the lower edge of the sealing ring 4 extends to the inner wall of the sand protection shield 8 and is fixed with the sand protection shield 8 .

[0035] An upper sealing sleeve 9 and a lower sealing sleeve 10 are sequentially socketed an...

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PUM

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Abstract

The invention discloses a velocity pipe column two-stage plugging device, which comprises an inner connection pipe and a sand-proof protective cover. The inner connection pipe is connected to the lower end of a velocity pipe column, and the sand-proof protective cover fixedly sleeves the outer wall of the inner connection pipe. A guide head is fixed to the lower portion of the inner connection pipe, the side wall of the top end of the inner connection pipe is provided with an air inlet, and an upper slider is externally and slidably connected with the air inlet and fixed to the inner connection pipe through a shear gasket. An upper plug and a lower plug are fixed to an inner cavity of the inner connection pipe sequentially from top to bottom, the lower plug is fixed to the inner connectionpipe through a dowel, and the side wall of the inner connection pipe below the lower plug and the corresponding position of the sand-proof protective cover are provided with air inlet holes. The velocity pipe column two-stage plugging device is structurally convenient and reliable in sealing, and convenience in sand prevention and cost saving are realized; the lower plug is connected to the lowerportion of the velocity pipe column to tightly prevent air from entering a passage of the velocity pipe column; a seal gasket and the inner wall of the velocity pipe column form reliable sealing, andthe upper portion of the lower plug is provided with upper and lower seal sleeves, so that reliability in sealing is achieved; the upper plug is connected with the upper slider to realize a secondaryplugging function, so that reliable sealing is realized.

Description

technical field [0001] The invention relates to the technical field of gas field development, in particular to a two-stage plugging device for a velocity string and a method for using it, which is applicable to all vertical wells and directional wells in the gas field. Background technique [0002] Velocity string drainage gas recovery is a commonly used technology in gas fields. Its principle is to reduce the pipe diameter and increase the gas flow rate, thereby achieving the purpose of improving the liquid-carrying capacity of gas wells. At present, during the construction of running the speed pipe string, the bottom is connected with a plug. After the speed pipe string is lowered to a suitable position and the speed pipe string is suspended, the plug is removed and the well is opened for production. When the velocity string needs to be pulled out in the later stage of production, it is generally necessary to use a coiled tubing machine to drive an in-pipe plug at the well...

Claims

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Application Information

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IPC IPC(8): E21B43/00E21B43/02E21B34/10E21B34/14
CPCE21B34/10E21B34/14E21B43/00E21B43/02
Inventor 王晓荣桂捷刘双全白晓弘赵彬彬李辰李在顺姚坚马海宾陈晓刚
Owner PETROCHINA CO LTD