Wellhead Landing Ring and Slip Hanger for Stuck Casing Handling
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Solution Overview
Problem
Conventional casing systems require large and heavy components, necessitating expensive and time-consuming installation processes, including the use of large diameter risers and diverters, and often involve hazardous welding operations when dealing with stuck casings, requiring separate equipment inventories for routine and contingency wellhead installations.
Innovation Solution
A casing system utilizing a common landing ring that supports both routine and stuck casing scenarios, incorporating a mandrel hanger and slip hanger, which allows for smaller, lighter components that can be installed using smaller risers and diverters, eliminating the need for welding and specialized equipment inventories.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional wellhead systems use large diameter risers and housing, then the system can accommodate running tools and housing, but the system becomes heavier, more expensive, and requires more complex installation procedures
Solution Approach 1:
The landing ring is designed to serve multiple functions: it acts as both the running tool passage and the wellhead support structure. The universal wellhead housing can accommodate different running tools and housing configurations without requiring separate large-diameter risers, thereby reducing weight while maintaining structural capacity.
Solution Approach 2:
The running tool and housing are nested within the wellhead assembly during installation. The conduit allows the running tool to pass through the wellhead housing, eliminating the need for separate large-diameter risers. This nesting approach reduces overall system weight while preserving the necessary structural strength.
2Ease of operation
If conventional systems use large diameter risers, then running tools and housing can be installed, but installation time and cost increase
Solution Approach 1:
The universal wellhead housing with integrated landing ring eliminates the need for separate large-diameter riser installation. The same housing accommodates both the running tool passage and wellhead support functions, streamlining the installation process and reducing time while maintaining ease of operation.
Solution Approach 2:
The landing ring and wellhead housing are merged into a single integrated structure. This combination eliminates the need for separate riser and housing installation steps, reducing installation time and complexity while preserving the capability to install running tools and housing effectively.
3Ease of repair
If conventional systems require welding for stuck casing contingencies, then repair capability is achieved, but safety hazards and operational costs increase
Solution Approach 1:
The system replaces welding (a thermal/mechanical process that generates sparks) with a mechanical retrieval method. The fishing tool with grapple mechanism mechanically engages and retrieves the stuck casing or object, eliminating the need for welding operations and associated safety hazards while maintaining repair capability.
Solution Approach 2:
The fishing tool acts as an intermediary device between the wellhead and the stuck casing. Instead of directly welding to the stuck casing, the fishing tool mediates the retrieval process by engaging the object with its grapple mechanism and pulling it out through the conduit, eliminating harmful welding operations.
4Adaptability or versatility
If conventional systems use specialized equipment for stuck casing, then repair options are available, but device complexity and cost increase
Solution Approach 1:
The wellhead housing with integrated landing ring and conduit serves as a universal platform that handles both routine operations and stuck casing contingencies. The same structure accommodates the fishing tool for retrieval operations, eliminating the need for specialized equipment while maintaining adaptability to handle various contingency scenarios.
Solution Approach 2:
The contingency handling capability is merged into the standard wellhead assembly. The landing ring and conduit that are part of the normal wellhead structure also serve as the pathway for fishing tools during stuck casing scenarios, reducing device complexity by eliminating separate specialized equipment while preserving versatility.
Data Source
AI summary
A casing system, includes a landing ring and a slip hanger. The landing ring defines an opening extending between a first end portion and a second end portion. The first end portion is configured to couple to a conductor pipe. The landing ring includes a landing ring shoulder extending radially inward from an inner surface of the opening. The slip hanger is configured to engage with casing The slip hanger includes at least one slip segment configured to engage with an outer diameter of the casing and an outer slip ring. The outer slip ring is disposed around and coupled to the at least one slip segment. The outer slip ring is configured to engage with the landing ring shoulder.