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Thin Wall Active Casing Hanger

a casing hanger and active technology, applied in the direction of sealing/packing, fluid removal, borehole/well accessories, etc., can solve the problem of limiting the load carrying capacity of the casing hanger, and achieve the effect of facilitating alignment and centralization

Inactive Publication Date: 2014-09-25
VETCO GRAY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a wellbore system that includes two position casing hangers. A load member is used to support the first position casing hanger, and the second position casing hanger is placed on top of the first position hanger. This setup helps to align and center the second position casing hanger during installation. Additionally, the load member also provides radial support to the first position casing hanger. The technical effect of this system is to improve the stability and alignment of the wellbore system.

Problems solved by technology

In addition to supporting the weight of the casing strings, the casing hangers must also generally support high pressures from tests of equipment placed above the casing hangers, and working loads associated with producing from the well.
To allow for the passage of larger pieces of equipment, walls of the casing hangers are thin, which may limit the load carrying capacity of a casing hanger in some instances.

Method used

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  • Thin Wall Active Casing Hanger
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  • Thin Wall Active Casing Hanger

Examples

Experimental program
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Embodiment Construction

[0020]Referring generally to FIGS. 1 and 2, a wellhead system 10 includes a wellhead housing assembly 12 and a stacked casing hanger array 14 supported therein. The wellhead system 10 defines a longitudinal axis AX extending therethrough. As used herein, the terms “longitudinal” and “axial” or variants thereof generally describe a direction parallel to the longitudinal axis AX, and the term “radial” or variants thereof generally describes a direction that is substantially perpendicular to the longitudinal axis AX.

[0021]The wellhead housing assembly 12 includes an outer housing 18 and a high pressure housing or high pressure wellhead 20 having an axial bore 22. The stacked casing hanger array 14 is an arrangement of two casing hanger assemblies 26, 28 including a first position casing hanger 26 and a second position casing hanger 28. The second position casing hanger 28 is “stacked” on the first position casing hanger 26 as described in greater detail below. In this example embodimen...

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PUM

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Abstract

A wellbore system includes a housing assembly and first and second position casing hangers supported by the housing assembly. A load member is provided that is adapted to extend between the first position casing hanger and the housing assembly to enable the housing assembly to support the first position casing hanger. The second position casing hanger is stacked onto the first position casing hanger, and an interface is defined between the first and second position casing hangers to aid in alignment and centralization of the second position casing hanger during installation. The interface also provides radial support to the first position casing hanger and enables loads associated with the second position hanger to be transferred to the housing assembly through the load member.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates in general to mechanisms for supporting a casing string from a wellhead. More specifically, the invention relates to a stacked casing hanger assembly for providing a load capacity in a compact space while facilitating installation.[0003]2. Description of the Related Art[0004]In an oil or gas well, a wellhead will generally be located on the ground surface, or on the sea floor for a subsea well. The wellhead is a tubular member having an axial bore. At least one load shoulder is usually disposed within the bore for supporting casing string. In deep wells, there will generally be more than one casing string extending into the well, and one or more load shoulders may be provided for supporting each one of the casing strings.[0005]Often, once a well is drilled to a certain depth, a first casing string is lowered through the axial bore of the wellhead and supported by a first casing hanger on a ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): E21B23/01
CPCE21B23/01E21B33/04
Inventor GETTE, NICHOLAS P.
Owner VETCO GRAY