Whipstock Latch Release Mechanism to Prevent Inadvertent Shearing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing releasable connections between whipstocks and milling tools in the oil and gas industry are prone to inadvertent shearing due to axial or torsional loads, leading to unnecessary retrieval operations and increased costs.
Innovation Solution
A latch release mechanism with an actuator piston and switch system that allows controlled release of the whipstock from the milling tool, preventing unintended shearing by blocking or allowing fluid communication based on switch configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a shearable member is used to attach the whipstock to the milling tool, then the connection can be released on command by shearing the member, but the connection is prone to inadvertent shearing due to axial or torsional loads
Solution Approach 1:
A latch member acts as an intermediary between the shearable member and the locking member. The latch member engages with the locking member to prevent inadvertent shearing, while allowing controlled release when the piston moves. This intermediary mechanism ensures the connection remains secure under normal axial and torsional loads but can be released on command.
Solution Approach 2:
The connection mechanism transitions from a static shearable member attachment to a dynamic system with a movable latch member and piston. The latch member can move between engaged and disengaged states, providing dynamic control over the connection's security and release, thereby preventing inadvertent shearing while enabling controlled operation.
2Reliability
If a latch mechanism is added to prevent inadvertent shearing, then reliability improves, but device complexity increases
Solution Approach 1:
The latch mechanism is merged with the existing shearable member attachment system. The latch member, piston, and locking member are integrated into a unified assembly that works together with the shearable member, rather than being a separate complex system. This merging approach adds reliability while minimizing overall device complexity.
Solution Approach 2:
The piston serves multiple functions: it moves to control the latch member for release, and it also acts as a blocker to prevent fluid communication until the latch is disengaged. This multi-functionality reduces the need for additional separate components, thereby adding reliability without proportionally increasing device complexity.
3Ease of operation
If fluid communication is blocked until latch release, then controlled release is achieved, but the system requires additional switching mechanisms
Solution Approach 1:
The fluid communication blocking function is merged with the latch mechanism itself. The piston, which is already part of the latch system, also serves as the fluid blocker. This integration means that the same mechanical movement that releases the latch also unblocks fluid communication, achieving controlled release without requiring separate switching mechanisms.
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 reliable and efficient release of the whipstock on command, reducing the need for multiple trips and retrieval operations, thereby saving time and costs.
Implementation Method 1
The actuator piston is movable in a longitudinal direction on the whipstock from a first piston position to a second piston position in response to fluid communication
Implementation Method 2
the shearable member is sheared when the switch is in the intermediate configuration
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
Methods and apparatus for releasing a downhole tool of a BHA from a whipstock in a wellbore include a latch release mechanism disposed on a whipstock. The latch release mechanism has a latch actuator and a latch member. The latch actuator has a switch and an actuator piston disposed in housing having an inlet. The inlet is in fluid communication with the actuator piston. The switch has first, intermediate, and second configurations. Fluid communication between the inlet and the actuator piston is blocked when the switch is in the first and intermediate configurations, and the fluid communication is unblocked when the switch is in the second configuration. The actuator piston is coupled to the latch member and configured to move the latch member out of engagement with a lock mechanism of the downhole tool in response to fluid communication from the inlet when the switch is in the second configuration.