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Hydraulic expansion type tail pipe hanger

A liner hanger and expansion technology, which is applied in wellbore/well components, sealing/packing, earth-moving drilling, etc., can solve the leakage of casing annulus cement ring seal, which is not conducive to subsequent operations, and the effect of seat sealing It can achieve the effect of good sealing quality, simple structure and large inner diameter of the pipe string.

Inactive Publication Date: 2009-12-09
CNPC BOHAI EQUIP MFG
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AI Technical Summary

Problems solved by technology

The mechanical structure is simple, the operation requirements are strict, the seat hanger is unreliable, the diameter becomes smaller after the seat hanger, which is not conducive to the follow-up operation, the seat seal effect is not good, and the casing annulus cement ring has sealing leakage problems, suitable for straight and shallow wells , a narrow range of application

Method used

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  • Hydraulic expansion type tail pipe hanger
  • Hydraulic expansion type tail pipe hanger

Examples

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Embodiment Construction

[0016] Such as figure 1 or figure 2 As shown, the drill pipe thread at the upper end of the drop joint 1 is screwed with the drill string, the inner thread at the lower end of the drop joint 1 is screwed with the central pipe 7, and the outer side of the central pipe 7 is sleeved with an expansion cone 10, which passes through the shear nails. B 11 is connected with the float valve sleeve 17, the expansion cone 10 slides freely on the center pipe 7, and the expansion cone 10, the expansion pipe 9 and the center pipe 7 realize a dynamic sealing fit through several sealing rubber rings. The screw thread of central tube 7 lower ends is screwed with float valve sleeve 17, and hinge seat 18, hinge 19, shift fork 15, valve cover 16 and spring are installed on float valve sleeve 17. The floating valve sleeve 17 is cylindrical, and its upper and lower ends are provided with pin holes, the pin holes at the upper end are connected with the shift fork 15 with pins, and the pin holes at...

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Abstract

The invention relates to a hydraulic expansion type tail pipe hanger, which comprises that: a drill stem thread at the upper end of a release sub is in threaded connection with a drill string; an internal thread at the lower end of the release sub is in threaded connection with a central pipe; an expansion cone is sleeved outside the central pipe, connected with a shear pin B and a float valve sleeve and freely slides on the central pipe; and the expansion cone and an expansion pipe realize motive seal fitting with the central pipe by a plurality of sealing rubber rings. The hanger is characterized in that a thread at the lower end of the central pipe is in threaded connection with the float valve sleeve; and the float valve sleeve is provided with a hinge mount, a hinge, a shifting fork, a valve cap and a spring. The hanger has the advantages of simple structure, convenient operation, high hanging success rate and good sealing quality. After a tail pipe is hung, the inner drift diameter of a pipe column is large, which is convenient for later drilling work. The hanger has obvious application advantages in ultra deep wells and horizontal wells with large displacement.

Description

technical field [0001] The invention relates to a liner suspension device in oil drilling and completion, in particular to a hydraulically expandable liner hanger. Background technique [0002] At present, there are mainly two structural forms of liner hangers used in the field, namely mechanical type and hydraulic type. The mechanical structure is simple, the operation requirements are strict, the seat hanger is unreliable, the diameter becomes smaller after the seat hanger, which is not conducive to the follow-up operation, the seat seal effect is not good, and the casing annulus cement ring has sealing leakage problems, suitable for straight and shallow wells , the scope of application is narrow. Contents of the invention [0003] In view of the deficiencies in the above technical problems, the purpose of the present invention is to provide a hydraulically expandable liner hanger. [0004] Technical scheme of the present invention is as follows: [0005] A hydraulica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B23/01E21B33/13
Inventor 霍海生
Owner CNPC BOHAI EQUIP MFG
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