Single Line Hydraulic Switching Apparatus for Downhole Tools
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Solution Overview
Problem
Hydraulically actuated downhole tools require two dedicated control lines to apply a pressure differential, increasing complexity and space usage, and risking damage and unintended actuation, which can lead to catastrophic events like hydrocarbon discharge.
Innovation Solution
A switching apparatus using a single control line with a switching piston and valve assembly that alternates coupling between two or more positions, allowing for dual actuation configurations through a single hydraulic pressure source, reducing complexity and risk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two dedicated control lines are used to apply pressure differential across piston seal, then reliable actuation of downhole tool is achieved, but device complexity and space requirements increase
Solution Approach 1:
The patent merges two separate control lines into a single control line by introducing a switching apparatus that directs hydraulic pressure to different sides of the piston seal based on actuation requirements. The switching apparatus includes a switching piston and valve assembly that couples the single control line to either the first or second side of the piston seal, eliminating the need for two dedicated control lines while maintaining reliable actuation capability.
Solution Approach 2:
The switching apparatus serves as an intermediary component between the single control line and the piston seal. It includes a switching piston that responds to hydraulic pressure from the control line and directs the pressure to the appropriate side of the piston seal through the valve assembly, enabling reliable actuation with reduced system complexity.
2Ease of operation
If two dedicated control lines are used, then complete control over downhole tool is achieved, but risk of line damage and inadvertent actuation increases
Solution Approach 1:
By consolidating two control lines into one, the patent reduces the number of potential failure points. The switching apparatus includes a valve assembly that controls pressure distribution, and the switching piston provides a mechanical interlock that prevents simultaneous pressurization of both sides of the piston seal, thereby preventing inadvertent actuation while maintaining full control capability.
3Device complexity
If single control line is used, then device complexity and space requirements are reduced, but ability to apply pressure differential across piston seal is compromised
Solution Approach 1:
The switching apparatus introduces dynamic control capability to the single control line system. The switching piston can move between positions to redirect hydraulic pressure from the control line to different sides of the piston seal based on the required actuation direction. This dynamic switching capability provides versatility in actuation configuration while maintaining system simplicity.
Solution Approach 2:
The single control line, through the switching apparatus, serves multiple functions by being able to pressurize either side of the piston seal depending on the switching piston position. This multi-functionality allows the single control line to provide complete control over the downhole tool's actuation in both directions, eliminating the need for separate control lines for each function.
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 efficient and reliable actuation of downhole tools with reduced space requirements and minimized risk of accidental activation, enhancing safety and operational efficiency.
Implementation Method 1
a switching piston actuated by a fluid pressure source
Implementation Method 2
a fluid pressure source coupled to a control line
Data Source
AI summary
A switching apparatus, system, and method configured to operate at least a dual line downhole tool via a single pressure source are provided. The switching apparatus may comprise a housing configured to contain a switching piston actuated by a fluid pressure source. The apparatus may further contain a switching valve comprising a first and second coupling passageway coupled to a switching valve housing comprising four ports. The switching piston may actuate the switching valve, alternating the coupling between a first configuration in which the four ports are communicatively coupled into two sets of ports and a second configuration in which the four ports are communicatively coupled into an alternate two sets of ports. The first configuration may configure the fluid pressure source to actuate the downhole tool in a first manner and the second configuration may configure the fluid pressure source to actuate the downhole tool in a second manner.