Radially Expandable Latch Ring for Wellhead Connection
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Solution Overview
Problem
Existing wellhead connections do not facilitate quick and efficient attachment and detachment of drilling stacks to conductor pipes or surface casings, requiring significant time and equipment for connection and disassembly.
Innovation Solution
A pressure-containing wellhead connection system comprising two housing members with a radially expandable and contractable latch ring, allowing for quick assembly and disassembly using radial actuators and a circumferential groove, along with an annular retaining ring for secure locking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional flanged drilling spools are used for connecting wellhead components, then the connection can be made with standard equipment, but considerable time and equipment are needed for connection and disassembly
Solution Approach 1:
The latch ring is divided into multiple segments that can be independently actuated by radial actuators, allowing the connection to be quickly engaged and disengaged without requiring time-consuming traditional flange alignment and bolt tightening procedures
Solution Approach 2:
The latch ring transitions from a static locked position to a dynamic movable position controlled by radial actuators, enabling rapid switching between connected and disconnected states through actuator-driven radial movement
2Loss of time
If a quick connection mechanism is implemented with radial actuators and latch ring segments, then makeup and disassembly time is reduced, but the device complexity increases
Solution Approach 1:
The radial actuators serve multiple functions: they act as both the actuating mechanism for the latch ring and as structural support elements, while the latch ring segments simultaneously provide locking engagement and act as guides for the actuators, reducing the need for separate components
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
Enables rapid and secure connection and disconnection of wellhead equipment, reducing the time and resources needed for makeup and break-up operations, suitable for drilling applications.
Implementation Method 1
A radially expandable and contractable latch ring formed from a plurality of latch ring segments is adapted to be positioned within the annulus so as to be adjacent the circumferential groove
Implementation Method 2
The housings may be adapted to form a seal to a cylindrical inner bore when connected together
Data Source
AI summary
A wellhead connection including first and second housings with the first housing partly within the second housing to form an annulus. The housings form a seal to a cylindrical inner bore when connected together. The first housing has a circumferential groove formed in its outer periphery. A radially expandable and contractable latch ring formed from latch ring segments is located in the annulus adjacent the circumferential groove. Radial actuators extend through the second housing to the latch ring segments to move the latch ring segments between a contracted position with the latch ring in contact with the circumferential groove, and an expanded position, with the latch ring out of contact with the circumferential groove. The upper and lower housings are adapted to lock the latch ring in the contracted position by applying a downward force on the latch rings, or by tightening the bottom connector to a wellhead member.