Downhole Tool Bonding Agent Assembly
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Solution Overview
Problem
Downhole tools used in oil and gas wellbores often experience premature setting and difficulty in removal due to axial movement and rotation issues during run-in and extraction processes.
Innovation Solution
A downhole tool design featuring a mandrel with a stem and hub portion, load and compression members, and slip members, where a bonding agent with predetermined shear strength fixes these components to the mandrel, preventing axial movement and rotation, and anti-rotation features engage to stabilize the tool components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional downhole tools are used without bonding agents, then the tool structure is simpler and easier to manufacture, but the tool experiences premature setting during run-in and difficulty in removal due to axial movement and rotation issues
Solution Approach 1:
A bonding agent is introduced as an intermediary substance between the mandrel and the load/compression members. This bonding agent prevents axial movement and rotation of the members relative to the mandrel, thereby eliminating premature setting and removal difficulties without requiring complex mechanical fastening mechanisms
Solution Approach 2:
The patent replaces traditional mechanical fastening systems (such as pins, keys, or threaded connections) with a chemical bonding system. The bonding agent creates a fixed connection between components through adhesive bonding, substituting mechanical interlocking with chemical bonding to achieve the same stabilization function with simpler assembly
2Ease of operation
If slip members are allowed to move axially with respect to the mandrel, then the tool can be set and removed more easily, but the tool experiences premature setting during run-in due to uncontrolled axial movement
Solution Approach 1:
The bonding agent is selectively applied only to specific regions where axial movement must be prevented (between the mandrel and load/compression members), while leaving other regions (such as the interface between slip members and mandrel) free for controlled axial movement. This localized bonding approach maintains operational flexibility while preventing premature setting
3Stability of the object's composition
If anti-rotation features are added to prevent rotation of components, then the tool maintains better alignment and stability, but the device complexity increases due to additional features
Solution Approach 1:
The bonding agent serves as an intermediary that also prevents rotation of components relative to the mandrel. By providing rotational restraint through adhesion, the bonding agent eliminates the need for separate anti-rotation mechanical features such as keys, splines, or interlocking geometries
Solution Approach 2:
The bonding agent simultaneously performs multiple functions: preventing axial movement, preventing rotation, and maintaining component alignment. By combining these functions into a single bonding mechanism rather than using separate mechanical features for each function, the overall device complexity is reduced
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 solution prevents premature setting during run-in and facilitates efficient removal by maintaining tool stability and alignment, ensuring effective sealing and easy extraction without the need for pins, enhancing operational efficiency and cost-effectiveness.
Implementation Method 1
A bonding agent is disposed between an outer surface of the mandrel and an inner surface of the load member and disposed between an outer surface of the stem portion of the mandrel and an inner surface of the compression member. The bonding agent has a predetermined shear strength that fixes the load member and the compression member to the mandrel, thereby isolating and preventing axial movement of the at least one slip member with respect to the mandrel
Data Source
AI summary
A downhole tool for a wellbore and method of assembly. Components of the tool include a load member, one or slip members, one or more compression members, and a sealing element between the compression members mounted on a mandrel. The components are designed to prevent pre-set of the tool in the wellbore and facilitate removal of the tool from the wellbore.