Landing String Compensator Slip Joint for Floating Rig
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Solution Overview
Problem
The existing methods for compensating a landing string on a floating rig platform are inefficient, requiring time-consuming and hazardous rigging of high-pressure equipment due to the movement of the platform, which complicates high-pressure operations and poses safety risks.
Innovation Solution
A compensation system comprising a slip joint member with upper and lower portions, connected to the floating rig and riser respectively, allowing the slip joint to extend or retract to accommodate platform movement, thereby enabling faster and safer rigging of pressure containment equipment below the rig floor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional crown mounted compensator or active heave compensating drawworks is used for landing string compensation, then the landing string can be compensated for platform movement, but the rigging of pressure containment equipment becomes time-consuming and hazardous due to platform movement
Solution Approach 1:
The compensator system employs a dynamic slip joint member that can extend and retract automatically in response to platform movement, allowing the system to adapt to changing sea conditions without manual intervention during critical rigging operations
Solution Approach 2:
The slip joint member acts as an intermediary between the fixed riser and the moving platform, absorbing the relative movement and providing a stable connection point for pressure containment equipment below the rig floor
2Ease of manufacture
If pressure containment equipment is rigged up at heights above the rig floor while the landing string assembly moves, then the equipment can be installed, but the operations become more complex and safety risks increase
Solution Approach 1:
The compensator system maintains a dynamic balance between the fixed riser and moving platform through the slip joint member, creating a stable working environment below the rig floor where pressure containment equipment can be installed without constant movement
Solution Approach 2:
The slip joint member extracts the movement compensation function from the main rigging operation, allowing pressure containment equipment to be rigged independently below the rig floor without being affected by platform movement above the floor
3Productivity
If the slip joint member is designed to extend and retract to accommodate platform movement, then faster and safer rigging is enabled, but the device complexity increases
Solution Approach 1:
The slip joint member is designed to automatically extend and retract based on platform movement without requiring external control systems, reducing device complexity while maintaining high productivity
Solution Approach 2:
The compensator system changes the physical state of the slip joint member between extended and retracted positions to accommodate platform movement, providing a simple yet effective mechanism for movement compensation
Data Source
AI summary
Apparatus and methods for compensating a landing string due to movement of a floating rig platform are provided. In one aspect, a compensation system for use with a landing string is provided. The compensation system includes a slip joint member attachable to the landing string, the slip joint member having an upper portion and a lower portion. The compensation system further includes a first lock assembly configured to connect the upper portion of the slip joint member to a floating rig. Additionally, the compensation system includes a second lock assembly configured to connect the lower portion of the slip joint member to a riser disposed below the floating rig. In another aspect, a method for compensating a landing string due to movement of a floating rig is provided.