Adjustable hanger system and method

a hanger system and adjustable technology, applied in the direction of drilling casings, drilling pipes, borehole/well accessories, etc., can solve the problems of complex and questionable reliability of the prior art adjustable hanger system

Inactive Publication Date: 2014-06-12
DRIL QUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]According to the method of the invention, the wellhead housing is provided with a plurality of axially spaced grooves to accept the support member, and includes a generally cylindrical sealing surface spaced axially above the plurality of grooves. The support member is positioned in the well on the hanger above selected ones of a plurality of grooves. When the hanger is lowered slightly in the well, the support member moves radially outward into the selected ones of the plurality of grooves, thereby preventing axially downward movement of the hanger with respect to the wellhead. A seal is sealed between the hanger and a generally cylindrical sealing surface while the support member is within selected ones of the plurality of grooves.

Problems solved by technology

Prior art adjustable hanger systems tend to be complicated, which in turn leads to questionable reliability.

Method used

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  • Adjustable hanger system and method
  • Adjustable hanger system and method

Examples

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Embodiment Construction

[0020]The hanger system disclosed herein provides an axial elongate sealing surface on the interior of the wellhead housing above an axially spaced plurality of grooves on the wellhead housing. Regardless of the position of the hanger with respect to the grooves, a seal will seal between the hanger and the cylindrical sealing surface above the plurality of grooves, and the hanger will be axially secured to the wellhead housing to provide the desired tension in the tubular string supported in the well from the hanger.

[0021]The hanger system allows for very fine adjustment of the position of the hanger relative to the wellhead, thereby obtaining fine adjustment of the tension applied to the tubular extending downward from the hanger. For many applications, the axially spacing of the grooves will be one-quarter inch or less. Because the grooves have the same groove profile and axial spacing, the support ring and the lockdown ring will fit within any of the selected grooves, which is co...

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PUM

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Abstract

An adjustable hanger system secures a hanger to a wellhead such that a downward extending tubular may be tensioned at a selected level. The wellhead includes a housing having a plurality of axially spaced grooves, with selected grooves receiving a support member therein. The wellhead housing also has an axially elongate and generally cylindrical sealing surface spaced above the plurality of grooves for sealing engagement with a seal element. The hanger is axially movable relative to the plurality of grooves. The hanger is supported by the support member which is radially movable into selected ones of a plurality of grooves. A lockdown member may also move into selected ones of the plurality of grooves for preventing axially upward movement of the hanger relative to the wellhead.

Description

FIELD OF THE INVENTION[0001]The present invention relates to an adjustable hanger system for connecting a hanger to a wellhead. More particularly, the adjustable hanger system is used for tensioning a tubular extending downward from the hanger and secured at a lower end in the well.BACKGROUND OF THE INVENTION[0002]Various types of hanger systems have been devised for tensioning a tubular in a well. Many prior art adjustable hanger systems include numerous components within the wellhead housing which are adjusted to achieve tensioning of the tubular. U.S. Pat. No. 5,176,218 discloses a threaded sleeve which is landed inside the wellhead. The sleeve interfaces with the hanger by rotating the hanger relative to the sleeve. U.S. Pat. Nos. 5,671,812, 5,255,746 and 5,944,111 utilize various arrangements of an internal load shoulder and a hanger with multiple grooves to achieve adjustability.[0003]U.S. Pat. No. 6,065,542 discloses another design wherein adjustment for tensioning is achieve...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): E21B19/00E21B23/00
CPCE21B33/04E21B33/043E21B23/00
Inventor ELLIS, FIFE B.DEBERRY, BLAKE T.TAMOSAITIS, JR., DONALD J.
Owner DRIL QUIP
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