Contraction Joint Stroke Locking Mechanism for Control Line Integrity
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Solution Overview
Problem
Contraction joints in well completions face challenges in maintaining the integrity of control lines due to axial movement, which can cause knotting or tangling, and in controlling the functionality until a desired depth is reached.
Innovation Solution
A contraction joint design that includes a stroke locking mechanism, a mandrel with a telescoping configuration, and a support piston to maintain the joint locked until a desired depth is reached, allowing for axial movement and accommodating control lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the contraction joint is allowed to move axially to accommodate contraction and expansion, then the completion string can compensate for thermal effects, but the control lines can knot or tangle and integrity is compromised
Solution Approach 1:
The contraction joint is divided into separate telescoping sections with control lines routed through guide structures. This segmentation allows axial movement while maintaining control line integrity by preventing them from knotting or tangling during expansion and contraction cycles.
Solution Approach 2:
Control line guide structures act as intermediaries between the moving contraction joint components and the control lines themselves. These guides ensure that control lines move smoothly with the joint without knotting or tangling, maintaining integrity while allowing necessary axial movement for thermal compensation.
2Reliability
If the contraction joint is locked to maintain control line integrity, then control lines remain secure, but the joint cannot accommodate contraction and expansion
Solution Approach 1:
The contraction joint employs a dynamic locking mechanism that can transition between locked and unlocked states. When locked, control line integrity is maintained; when unlocked, the joint can telescope to accommodate thermal contraction and expansion. This dynamic capability resolves the contradiction by allowing both states as needed.
3Reliability
If the contraction joint remains locked during deployment, then control lines are protected, but it is difficult to control functionality until desired depth is reached
Solution Approach 1:
The locking mechanism is designed to automatically unlock when a specific depth or condition is reached during deployment. This self-service feature protects control lines during the deployment process while automatically enabling contraction compensation functionality at the desired depth without requiring additional intervention.
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
The contraction joint effectively maintains the integrity of control lines and ensures the joint remains locked until the desired depth is reached, facilitating production operations by allowing contraction functionality at depth.
Implementation Method 1
a support piston disposed in the piston housing, the support piston being affixed to the upper mandrel sub of the mandrel
Implementation Method 2
contraction joints are used with well completions, such as between two or more completion assemblies, to compensate for contraction and expansion of the completion string
Data Source
AI summary
A contraction joint includes a mandrel at least partially disposed within an upper tubular member, the upper tubular member being capable of moving uphole and downhole to change a length of the contraction joint. The contraction joint also includes a nipple housing connected to the upper tubular member, a piston housing connected to the nipple housing, a support piston disposed in the piston housing, the support piston being affixed to an upper mandrel sub of the mandrel via at least one piston retaining device, a lock housing disposed between the upper tubular member and the upper mandrel sub, and a stroke locking mechanism disposed within the lock housing, the stroke locking mechanism including a profile that engages the nipple housing.