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Releasable screen tube hanger

A hanger and screen technology, used in wellbore/well components, earth-moving drilling, etc., can solve the problems of large unsealing load and difficulty in unsealing, and achieve small unsealing force, safe and smooth unsealing, and setting. Safe and reliable effect

Active Publication Date: 2015-10-21
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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  • Releasable screen tube hanger
  • Releasable screen tube hanger

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0010] like figure 1 , figure 2 As shown, an unsealable screen hanger includes an upper joint 1, a piston cylinder 3, a central pipe 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 setting shear nails 2, and the upper joint 1 There is a boss on the outer wall and is sealed with the inner wall of the piston barrel 3 through the sealing ring I4, and the boss is arranged on the inner wall of the piston barrel 3 and is sealed with the outer wall of the upper joint 1 through the sealing ring II5. The space between the boss of joint 1 and the boss of piston barrel 3 is a communication hole. There is a pressure relief hole on the side wall of the lower end of the boss of piston barrel 3. 1. The lower end face bears on the hands-off support sleeve 8. The hands-off claw spring 9 is connected to the hands-off support sleeve 8 through the hands-off shear nail 6 and is sealed by the sealing ring III 7. The inner...

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Abstract

The invention relates to the technical field of well completion of a screen tube at a horizontal segment of a horizontal well, especially to a releasable screen tube hanger An upper end of a piston cylinder is connected to an outer wall of an upper connector by a setting shear pin; a boss is arranged on the outer wall of the upper connector and sealing with an inner wall of the piston cylinder is realized by a sealing ring I; and a boss is arranged on the inner wall of the piston cylinder and sealing with the outer wall of the upper connector is realized by a sealing ring II. A connecting hole communicated with the space between the boss of the upper connector and the boss of the piston cylinder is formed in the side wall of the upper connector; and a pressure relief hole is formed in the side wall of the lower end of the boss of the piston cylinder. According to the invention, two releasing ways of hydraulic way and mechanical inverted buckling way are used; with the unique releasing mechanism, the seat hanging and setting become safe and reliable; the needed lifting releasing force is small; releasing can be realized safely and successfully; and an operational requirement of salvage of the hanger and tailpipe column during the subsequent well repairing work can be met. Defects that the lifting releasing load is heavy and the releasing is difficult to be done of the existing screen tube hanger can be overcome.

Description

Technical field: [0001] 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. Background technique: [0002] The screen hanger is an important tool for vertical wells, deviated wells, extended reach wells, and horizontal wells to hang liners and screens, and is widely used in the screen hang completion process of horizontal wells. 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 Unseal the shear pins on the hanger, unseal the hanger, and raise the screen hanger. When this conventional screen hanger is set, the setting pressure compresses the rubber cylinder directly on the slips and unsealing shears. Hanging, setting seal failure. In order to avoid such ...

Claims

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Application Information

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Patent Type & Authority Applications(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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