Velocity string sand-preventing-type plugging tool and using method thereof

A speed pipe string and sand control technology, which is used in earth-moving drilling, wellbore/well components, sealing/packing, etc., can solve problems such as puncture, hidden danger, and affect the normal production of gas wells, and achieve reliable sealing and convenient sand control. , a wide range of effects

Pending Publication Date: 2019-03-01
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology mainly has one problem: for sand producing wells, when the gas flow velocity increases, it will carry sand and gravel out of the wellhead, puncture ground pipeline valves and other devices, causing safety hazards, thus affecting the normal production of gas wells

Method used

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  • Velocity string sand-preventing-type plugging tool and using method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A speed pipe string sand prevention plugging tool, which at least includes an inner connection pipe 2 connected to the lowermost end of the speed pipe string 1, characterized in that: the inner connection pipe 2 is a pipe column structure, and the lower part of the inner connection pipe 2 is fixed with a guide head 9 , the inner cavity of the inner connection pipe 2 is provided with a plug 7, the plug 7 is fixed by the pin 8 and the inner connection pipe 2, the outer wall of the inner connection pipe 2 is fixed with a sand guard 5 along its circumference, and the side of the inner connection pipe 2 below the plug 7 Air intake slots 10 are provided on the wall and at corresponding positions of the sand control shield 5 .

[0024] like figure 1 As shown, in the production process of water-producing gas wells, in order to reduce the pipe diameter and increase the gas flow rate to help the gas well carry liquid, it is necessary to adopt the velocity pipe string drainage gas...

Embodiment 2

[0027] like figure 1 As shown, it is improved on the basis of Embodiment 1, and the pin 8 is detachably connected with the inner connecting pipe 2 along the diameter direction of the inner connecting pipe 2 . The plug 7 is fixed on the inner connection pipe 2 by the pin 8. At this time, the plug 7 is in a sealed state and plays the role of isolating the gas layer and the velocity string 1; The annulus production of the crude oil pipeline causes a pressure difference between the top and bottom of the plug 7 in the inner cavity of the inner connection pipe 2, so that the pin 8 is cut off and the plug 7 is removed. At this time, the sealing state of the plug 7 is released, and the production pipeline starts the production mode. At this time, the detachable connection mode is convenient for production, saves labor costs, and has high production efficiency.

[0028] The inner connecting pipe 2 is rolled and connected to the lowermost end of the velocity string 1 . The rolling con...

Embodiment 3

[0036] like figure 1 As shown, it is improved on the basis of Embodiment 1 or Embodiment 2, and the bottom end of the guide head 9 is a closed conical structure. The conical structure is more in line with the requirements of the aerodynamic structure for the shape of the product. During the production process of water-producing gas wells, the air resistance is reduced and it is convenient to use.

[0037] There are several air intake slots 10 , and the several air intake slots 10 are uniformly arranged circumferentially along the corresponding positions of the inner connection pipe 2 and the sand protection shield 5 .

[0038]When in use, the high-pressure gas in the gas well casing is introduced into the velocity string 1, and then the velocity string 1 and the crude oil pipe annulus are used to produce a pressure difference between the upper and lower plugs 7 of the inner cavity of the inner connection pipe 2, thereby shearing The pin 8 further removes the plug 7 to form th...

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PUM

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Abstract

The invention discloses a velocity string sand-preventing-type plugging tool and a using method thereof. The velocity string sand-preventing-type plugging tool at least comprises an inner connecting pipe connected to the bottommost end of a velocity string, the inner connecting pipe is of a string-shaped structure, a guiding head is fixed to the lower part of the inner connecting pipe, and a plughead is arranged in an inner cavity of the inner connecting pipe; and the plug head is fixed to the inner connecting pipe through a pin, a sand-preventing protective hood is fixed to the outer wall ofthe inner connecting piece in the circumferential direction of the inner connecting pipe, and gas feeding kerves are formed in the positions, below the plug head, on the side wall of the inner connection pipe and the corresponding position of the sand-preventing protective hood correspondingly. The structure is convenient, and sealing is reliable; the plug head is connected to the lower part of the velocity string, a channel where gas enters the velocity string is closely blocked, a sealing mat and the inner wall of the velocity string are reliably sealed, upper and lower sealing sleeves arearranged on the upper part of the plug head, and sealing is reliable; after the pin is sheared off and the plug head is knocked out, the plug head falls into the guiding head, and the gas enters fromthe kerves of the sand-preventing protective hood to achieve effective sand prevention; and the application range is wide, all parts in the string can bear the high pressure, and thus the velocity string sand-preventing-type plugging tool is suitable for working in deep wells or high-pressure gas wells.

Description

technical field [0001] The invention relates to the technical field of gas field development, in particular to a velocity pipe string sand prevention plugging tool and a use method, which are suitable for all vertical wells and directional wells in gas field development. 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. This technology mainly has one problem: for sand producing wells, when the gas flow velocity increases, it will carry sand and gravel out of the wellhead, puncture ground pi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/12
CPCE21B33/12
Inventor 王晓荣桂捷白晓弘赵彬彬马海宾姚坚李辰高仕举谈泊李彦彬
Owner PETROCHINA CO LTD
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