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An unsealable screen hanger

A technology of hanger and screen pipe, which is applied in wellbore/well parts, earthwork drilling and production, etc. It can solve the problems of difficulty in unsealing and heavy unsealing load, and achieve safe and smooth unsealing, small unsealing force and satisfactory operation effect of demand

Active Publication Date: 2017-07-21
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It overcomes the shortcomings of the existing screen hanger, which has a large lifting and unsealing load and difficult unsealing

Method used

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  • An unsealable screen hanger
  • An unsealable screen hanger

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Experimental program
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Embodiment Construction

[0015] Such as figure 1 , figure 2 As shown, a de-sealable screen hanger includes an upper joint 1, a piston cylinder 3, a central tube 16 and a lower joint 31; the upper end of the piston cylinder 3 is connected to the outer wall of the upper joint 1 through a setting shear nail 2. The upper joint 1. A boss is provided on the outer wall and the boss is sealed with the inner wall of the piston cylinder 3 through a sealing ring I4. A boss is provided on the inner wall of the piston cylinder 3 and the boss is sealed with the outer wall of the upper joint 1 through a sealing ring II5. The upper joint 1 side The wall is provided with a communication hole that communicates with the space between the boss of the upper joint 1 and the boss of the piston cylinder 3, and the side wall of the lower end of the piston cylinder 3 is provided with a pressure relief hole. The outer wall of the lower end of the upper joint 1 is threadedly connected. The claw spring 9, the lower end of the upp...

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Abstract

The invention relates to the technical field of screen tube completion in a horizontal section of a horizontal well, in particular to an unsealable screen tube hanger. The upper end of the piston barrel of the device is connected to the outer wall of the upper joint through setting shear nails. The outer wall of the upper joint is provided with a boss and the boss is sealed with the inner wall of the piston barrel through the sealing ring I. The inner wall of the piston barrel is provided with a boss and the The boss is sealed with the outer wall of the upper joint through the sealing ring II, and the side wall of the upper joint is provided with a communication hole that communicates with the space between the boss of the upper joint and the boss of the piston barrel, and the side wall of the lower end of the boss of the piston barrel is opened with a leak Pressure hole. The invention realizes the use of hydraulic pressure and mechanical undercut two methods of throwing away, the unique unsealing mechanism makes the sitting and setting safe and reliable, the lifting and unsealing force is small, and the unsealing is safe and smooth, which meets the requirements for salvage during later workover operations. Operational requirements for hangers and liner strings. The invention overcomes the disadvantages of large lifting and unsealing load on the existing screen hanger and difficult unsealing.

Description

[0001] Technical field: [0002] The invention relates to the technical field of screen completion of horizontal sections of horizontal wells, in particular to a de-sealable screen hanger. [0003] Background technique: [0004] Screen hanger is an important tool for vertical wells, inclined wells, extended reach wells, horizontal well completions to hang tailpipes and screens. It is widely used in horizontal well screen suspension completions. The unsealing mechanism of the screen hanger is an important part of the screen hanger. The unsealing principle of the conventional screen hanger is to lower the spear matched with the hanger, catch the inner wall of the hanger, lift the pipe string, and cut it. Unblock the shear nails on the hanger, unblock the hanger, and put out the screen hanger. When this conventional screen hanger is set, the setting pressure compression rubber cylinder directly acts on the slips and unsealing shear nails. When the setting pressure difference is large, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B23/01
Inventor 王磊朱太辉吴兴国王春杰薛志永钟勇杨行夏方杰崔志强郑德志陈敏华张旭龙
Owner BC P INC CHINA NAT PETROLEUM CORP
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