Well Servicing Mandrel With Split Rings And Stabilizers
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Solution Overview
Problem
Existing downhole tools for oil and gas well servicing are costly and difficult to maintain, with separate components for cleaning and debris removal lacking common structural elements, leading to high wear on the central mandrel and inefficient operation.
Innovation Solution
A well servicing apparatus featuring a central mandrel with split rings and stabilizer elements that allow for easy mounting and rotation of interchangeable service components such as brushes, junk baskets, and magnets, minimizing wear on the mandrel and enabling efficient cleaning and debris collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate dedicated tools are used for cleaning and debris removal, then each tool can be optimized for its specific function, but the overall system complexity increases and maintenance difficulty increases
Solution Approach 1:
The patent combines multiple dedicated tools (casing scraper, junk basket, and magnet) into a single integrated downhole tool assembly. These components are mounted on a common mandrel structure, allowing them to be deployed together as one unit while maintaining their individual cleaning and debris removal functions. This merging reduces the number of separate tools needed and simplifies the overall system.
Solution Approach 2:
The mandrel structure serves as a universal platform that can accommodate multiple different service components. The same mandrel can be used with different combinations of scrapers, brushes, junk baskets, and magnets depending on the specific well servicing needs, making the base tool multi-functional while maintaining optimized performance for each function.
2Reliability
If separate dedicated tools are used for cleaning and debris removal, then each tool can be optimized for its specific function, but the maintenance difficulty and cost increase
Solution Approach 1:
The tool assembly is segmented into modular components (scrapers, brushes, junk baskets, magnets) that are independently mounted on the mandrel. This segmentation allows individual components to be removed, replaced, or maintained separately without affecting the entire tool assembly, significantly easing maintenance operations and reducing downtime.
Solution Approach 2:
The design allows worn or damaged service components to be easily discarded and replaced with fresh components while retaining the expensive mandrel structure. This approach recovers the high-value mandrel for repeated use while only replacing the lower-cost consumable service elements, reducing overall maintenance costs.
3Ease of manufacture
If interchangeable components are mounted on the central mandrel, then the cost and wear on the mandrel are reduced, but the device complexity increases
Solution Approach 1:
The mounting mechanism is segmented into simple, standardized interfaces between the mandrel and service components. Each component has its own mounting structure that attaches to the mandrel independently, creating a modular assembly system that is easier to manufacture and assemble than a fully integrated design.
Solution Approach 2:
The mandrel is designed as a universal carrier with standardized mounting features that can accommodate various types of service components. This universality allows the same mandrel structure to be used with different component configurations, reducing the need for multiple specialized mandrels and simplifying manufacturing.
4Productivity
If multiple service components are mounted on the same mandrel, then operational efficiency increases, but the difficulty of detecting and measuring component status increases
Solution Approach 1:
Each service component is segmented as an independent unit with its own mounting interface and structural features. This segmentation allows each component to be individually inspected, measured, and assessed for wear or damage without needing to disassemble the entire tool assembly, facilitating easier status monitoring.
Solution Approach 2:
Each service component has its own localized structural features and mounting characteristics that are optimized for its specific function. This local differentiation in design makes it easier to identify and assess the condition of individual components based on their unique structural signatures, even when mounted together on the same mandrel.
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 apparatus reduces the cost and wear of the central mandrel by allowing interchangeable components, enhancing cleaning efficiency and debris collection capabilities while maintaining tool effectiveness.
Implementation Method 1
said stabilizer elements comprise mating inner circumferential ball races, and further comprising a plurality of balls disposed in the mating ball races, whereby said stabilizer elements can rotate with respect to the central mandrel
Implementation Method 2
one or more service elements removably disposed around the said central mandrel and held in place by said one or more stabiliser elements, wherein the one or more service elements comprise one of a brush assembly, a junk basket or a magnet
Data Source
Figure 1~1A
Figure 2~3
Figure 4~6
AI summary
Apparatus for cleaning the inner wall of wellbore tubulars, and for capturing downhole debris in the wellbore An elongated, tubular central mandrel has threaded connections on either end for makeup into a tubular string The mandrel has recesses on its outer circumference into which split rings are mounted Various service elements are then attachable to the central mandrel, by sliding them over the mandrel and holding them in place with stabilizer elements which connect to the split rings Different embodiments of the service elements include a brush assembly, a junk basket, and a magnet The stabilizer elements may be mounted onto the split rings so as to either be rotationally locked with respect to the mandrel, or so as to be capable of rotating with respect to the mandrel, since th service elements are held in place on the central mandrel by the stabilizer elements.