Wellhead Load Member Actuation for Over-Pull Testing

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Solution Overview

Problem

In the oil and gas industry, particularly in subsea wells, there is a challenge in ensuring proper engagement and actuation of load rings to support casing hangers within wellheads, especially at increasing seawater depths, where it is difficult to confirm if the load ring has been actuated correctly from the surface.

Innovation Solution

A wellbore system with a hanger assembly that includes an actuation member and a load member, where the actuation member interacts with the housing assembly to expand the load member between the hanger assembly and the housing, enabling a lifting force to be transferred from the surface for an over-pull test, ensuring proper engagement and support.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If a load ring is used to support the casing hanger in subsea wells, then the casing hanger can be supported at greater ocean depths, but it becomes difficult to obtain a positive indication that the load ring has been actuated correctly from the surface

Engineering Contradiction:
Improveocean depthVSAvoidactuation indication
Core Design Contradiction:
TemperatureVSDifficulty of detecting and measuring

Solution Approach 1:

The patent implements a feedback mechanism where the actuation of the load ring generates a detectable signal that can be monitored from the surface. The system provides real-time information about the actuation status through pressure or position sensors that transmit data back to surface operators, allowing them to confirm proper engagement without direct visual inspection.

Inventive Principle:
Principle #23Feedback

Solution Approach 2:

The patent introduces an intermediary signaling mechanism between the load ring actuation and surface observation. This intermediary system converts the mechanical actuation event into a detectable signal (such as pressure change, position change, or electrical signal) that can be transmitted through the wellbore environment to surface monitoring equipment.

Inventive Principle:
Principle #24Intermediary (Mediator)

2Force

If the load ring is actuated to extend between the casing hanger and wellhead, then the casing hanger can be supported, but proper engagement may not be confirmed

Engineering Contradiction:
Improvesupport forceVSAvoidengagement confirmation
Core Design Contradiction:
ForceVSReliability

Solution Approach 1:

The system incorporates sensors that detect when the load ring has fully extended and engaged with the wellhead. This feedback mechanism provides real-time confirmation of proper engagement by monitoring position, pressure, or force parameters, ensuring that the support function is reliably activated before production begins.

Inventive Principle:
Principle #23Feedback

Solution Approach 2:

The patent implements preliminary verification steps before final engagement is confirmed. The system checks intermediate parameters during the actuation process to ensure the load ring is properly positioning itself, allowing operators to detect and correct potential engagement issues before they compromise structural support.

Inventive Principle:
Principle #10Preliminary action

3Ease of operation

If the load member is carried in a retracted position, then the hanger assembly can be lowered into the wellhead, but the load member must be expanded to provide support

Engineering Contradiction:
Improvelowering operationVSAvoidexpansion mechanism
Core Design Contradiction:
Ease of operationVSDevice complexity

Solution Approach 1:

The patent employs a dynamic expansion mechanism where the load member transitions from a compact retracted state during lowering to an extended support state upon engagement. This dynamic transformation is achieved through mechanically actuated expansion elements that respond to position or force triggers, allowing the same structure to serve multiple functional requirements at different operational stages.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The load member is designed with a nested structure where components are contained within each other in the retracted position, minimizing the profile during lowering operations. Upon actuation, these nested components unfold or extend outward to provide the necessary support structure, effectively transforming a compact form into a functional support mechanism.

Inventive Principle:
Principle #7Nested doll (Nesting)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This solution ensures reliable engagement and support of the casing hanger within the wellhead, facilitating safe and effective installation and operation, even at greater ocean depths by providing a mechanical advantage for load member expansion and confirming engagement through weight transfer and over-pull tests.

Implementation Method 1

a resilient device, such as an expandable C-ring, to expand the load member

Methodology Applied
Scientific EffectElasticity: Elasticity

Implementation Method 2

The actuation member is adapted to transfer a lifting force from the surface to the load member

Methodology Applied
Scientific EffectMechanical advantage: Mechanical Advantage

Data Source

PatentEP2239412B1Wellhead system having a resilient device to actuate a load member and enable an over-pull test of the load member
Publication Date: 2018.05.16 VETCO GRAY INC
  • EP2239412B1 patent drawingFigure 1
  • EP2239412B1 patent drawingFigure 2
  • EP2239412B1 patent drawingFigure 3

AI summary

A wellbore system (20) comprising a housing assembly (22) and a hanger assembly (24). The hanger assembly (24) comprises an actuation member (36) that interacts with a portion (38) of the housing assembly (22) when the hanger assembly (24) is positioned at a desired location in the housing assembly (22). The hanger assembly (24) also comprises a load member (28) that is adapted to extend between the hanger assembly (24) and the housing assembly (22) to enable the housing assembly (22) to support the hanger assembly (24). The load member (28) is carried into the wellbore in a retracted position. When the actuation member (36) interacts with the housing assembly (22) at the desired location, the actuation member (36) actuates the load member (28) to expand outward to extend between the hanger assembly (24) and the housing assembly (22). The actuation member (36) is adapted to transfer a lifting force from the surface to the load member (28) to enable an over-pull test of the hanger assembly (24) to be performed.