Angled Lockscrew Tubular Connector for Wellhead
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Solution Overview
Problem
Existing wellhead tubular connector systems are complex and time-consuming to install, repair, and replace, especially in subsea environments, due to the need for additional tools and insufficient tension and pressure support.
Innovation Solution
A tubular connector system using angled lockscrews and locking segments that provide both axial and radial support, allowing for secure connection and disconnection without additional tools, by rotating the lockscrew to move the locking segment between unlocked and locked positions, thereby compressing the tubular members radially and axially.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional locking mechanisms are used to join wellhead components, then the connection can be secured, but the installation and repair process becomes time-consuming and complicated due to the need for additional tools and parts
Solution Approach 1:
The locking segment and lockscrew are merged into an integrated unit that combines the locking function with the actuating mechanism. The locking segment includes an internal cavity that receives the lockscrew, and the boss member with slot creates a mechanical linkage that automatically engages the tubular member when the lockscrew is rotated. This integration eliminates the need for separate locking components and reduces the number of steps required to secure the connection.
Solution Approach 2:
The locking mechanism is designed to be self-contained and self-actuating. The slot in the locking segment engages with the boss member of the lockscrew, creating a mechanical linkage that automatically translates the rotational motion of the lockscrew into the radial movement of the locking segment. This self-service mechanism eliminates the need for external tools or additional parts to operate the locking function, allowing for quick installation and repair by simply rotating the lockscrew.
2Reliability
If traditional locking mechanisms are used, then components can be connected, but the mechanism is insufficient for handling the tension and pressure loads on the wellhead assembly
Solution Approach 1:
The locking segment is designed to move in multiple dimensions: radially outward to engage the tubular member and axially to maintain continuous contact. The angled surface of the locking segment converts the rotational force from the lockscrew into both radial and axial movement components. This multi-dimensional movement allows the mechanism to handle both tension and pressure loads effectively while maintaining a relatively simple structure.
Solution Approach 2:
The locking mechanism incorporates dynamic elements that allow it to adapt to different loading conditions. The locking segment can move radially and axially in response to the forces applied during operation. The spring-loaded or preloaded design of the lockscrew ensures continuous contact between the locking segment and the tubular member, maintaining reliable engagement under varying tension and pressure loads without requiring an overly complex mechanism.
3Reliability
If additional parts and tools are used for locking, then the connection can be secured, but the overall system complexity increases
Solution Approach 1:
The locking segment and lockscrew are merged into an integrated unit that combines the locking function with the actuating mechanism. The locking segment includes an internal cavity that receives the lockscrew, and the boss member with slot creates a mechanical linkage that automatically engages the tubular member when the lockscrew is rotated. This integration eliminates the need for separate locking components and reduces the number of steps required to secure the connection.
Solution Approach 2:
The lockscrew serves multiple functions: it acts as both the actuating mechanism and the locking element. By rotating the lockscrew, the user simultaneously activates the locking segment and secures the connection. The locking segment itself performs dual functions by providing both the radial engagement with the tubular member and the axial contact to maintain connection integrity. This multi-functionality reduces the total number of parts required in the system.
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
Simplifies the installation and maintenance of wellhead components by reducing the need for additional tools and providing sufficient support against pressure and tension loads, enhancing operational efficiency in both onshore and subsea mineral extraction systems.
Implementation Method 1
the lockscrew may be moved in a first linear direction along a second angled axis that is disposed at an acute angle to a longitudinal axis of the first tubular member to drive the locking segment toward the locked position
Implementation Method 2
compressing the tubular members radially and axially
Implementation Method 3
providing sufficient support against pressure and tension loads
Data Source
AI summary
Systems and methods are provided that may include employing a lockscrew to provide radial and axial force in connecting tubular members in a mineral extraction system. The lockscrew may be angled relative to the tubular members, at an angle that is greater than 0 degrees and less than 90 degrees. Further, the lockscrew may have an end portion which mates with a slot in a locking segment, and the lockscrew and locking segment may be moved from an unlocked to a locked position. In a locked position, the lockscrew exerts force axially downward and radially inward to push the locking segment against a tubular member, locking the member in place. The interconnection between the lockscrew and the locking segment may enable easier installation and may utilize parts which may be easier to manufacture. Furthermore, the angle of the lockscrew may provide improved support for tubular members.