Downhole Activation Device Pinion Force Conversion
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Solution Overview
Problem
Existing downhole tool activation methods face challenges in applying a push force effectively, particularly when using cup seals in pairs, as it is more difficult to transmit a push force from the surface compared to a pull force.
Innovation Solution
A device comprising a first and second elongate member with toothed surfaces and a pinion arrangement that converts a pull force applied from the surface into a push force downhole, allowing for the activation of downhole tools like packers by engaging the toothed surfaces and rotating the pinion arrangement to move the members in opposite directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pull force is applied from the surface to activate cup seals, then the activation is straightforward and reliable, but it cannot effectively apply a push force downhole to move components in the opposite direction
Solution Approach 1:
The pinion arrangement acts as an intermediary mechanism between the first and second elongate members. When a pull force is applied to the first member, the pinion arrangement converts this linear motion into rotational motion, which then drives the second member in the opposite direction. This mediator mechanism enables effective push force application downhole without requiring direct push force from the surface.
2Reliability
If cup seals are used in pairs to isolate a section of conduit, then the sealing effectiveness is improved, but the complexity of applying forces to both seals increases
Solution Approach 1:
The pinion arrangement merges the activation of two separate cup seals into a single operational action. By engaging both toothed surface portions simultaneously, the mechanism converts a single pull force applied from surface into coordinated movement of both elongate members in opposite directions, thereby activating both cup seals together. This combining approach maintains high sealing effectiveness while reducing operational complexity.
3Ease of manufacture
If a single pinion is used in the pinion arrangement, then the construction is simple and equal movement of members is achieved, but unequal movement requirements cannot be met
Solution Approach 1:
The pinion arrangement can be segmented into multiple pinions, each with different tooth counts or configurations. This segmentation allows the system to accommodate unequal movement requirements between the first and second elongate members while maintaining the overall simplicity of the gear-based conversion mechanism. Each pinion can be independently designed to achieve the desired movement ratio for its specific application.
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
Enables the effective activation of downhole tools by converting a pull force into a push force, facilitating the sealing process of cup seals in pairs, thereby improving the sealing efficiency and ease of operation.
Implementation Method 1
at least one pinion arrangement, the/each pinion arrangement engaging the toothed surface portions of the first and second members such that movement of one member in a first direction results in movement of the other member in a second direction, opposite the first direction
Data Source
AI summary
A device for activating a downhole tool is described. The device comprises a first elongate member defining a toothed surface portion, a second elongate member defining a toothed surface portion and at least one pinion arrangement The/each pinion arrangement engages the toothed surface portions of the first and second members such that movement of one member in a first direction results in movement of the other member in a second direction, opposite the first direction.