Subsea Test Tree Nested Riser Intervention Package
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Solution Overview
Problem
Conventional subsea well intervention and workover systems require complex and expensive handling, occupying large spaces on vessels and posing challenges in storage and deployment due to their size and weight.
Innovation Solution
A lower riser package spool, riser stress joint, and riser intervention system that reduces the overall size and weight of components while maintaining essential functions, featuring a bore with an outer annulus outlet, a subsea test tree that can be landed and secured within the spool, and a riser stress joint with tapered surfaces for high fatigue applications, along with an actuated connector for quick disconnection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional subsea well intervention systems are used, then reliable well intervention functions are achieved, but the system occupies large space on vessels and requires complex handling
Solution Approach 1:
The subsea test tree is landed and secured within the lower riser package spool, creating a nested configuration where one equipment is housed inside another. This nesting approach significantly reduces the space occupation on vessels while maintaining all essential well intervention functions.
Solution Approach 2:
The invention combines the subsea test tree and lower riser package into a single integrated intervention package. By merging these previously separate systems, the patent achieves compact deployment and reduces the overall space requirement on vessels while preserving reliable well intervention capabilities.
2Adaptability or versatility
If conventional handling systems are used, then essential functions are maintained, but the system becomes complex and expensive
Solution Approach 1:
The intervention system is divided into distinct modular components including the lower riser package spool, subsea test tree, and actuated connector. This segmentation allows each component to perform specific functions independently, simplifying the overall handling system while maintaining adaptability for various well intervention operations.
Solution Approach 2:
The integrated intervention package is designed to perform multiple well intervention functions through a single unified system. The actuated connector enables quick disconnection and reconfiguration, allowing the same equipment to adapt to different operational requirements without requiring complex specialized handling systems.
3Adaptability or versatility
If large equipment is deployed, then sufficient functionality is achieved, but storage and deployment become challenging
Solution Approach 1:
By nesting the subsea test tree within the lower riser package spool, the invention creates a compact configuration that is easier to store and deploy. The nested structure reduces the overall equipment footprint while maintaining sufficient functionality for well intervention operations.
Solution Approach 2:
The actuated connector provides dynamic quick-disconnect capability, enabling rapid deployment and reconfiguration of the intervention package. This dynamic feature simplifies storage and deployment operations by allowing the equipment to be quickly assembled and disassembled without complex manual handling procedures.
Data Source
AI summary
A riser intervention system for use with a subsea test tree includes a lower riser package spool, an intermediate spool, and a riser stress joint. The lower riser package spool may include a bore and a shoulder projecting into the bore such that the subsea test tree is landable on the shoulder within the lower riser package spool. The intermediate spool is connectable to the lower riser package spool to secure the subsea test tree within the bore of the lower riser package spool such that the lower riser package spool is in fluid communication with the intermediate spool. The riser stress joint is releasably connectable to the intermediate spool using such that the intermediate spool is in fluid communication with the riser stress joint.