Meltable Material Actuation for Well Tool Safety
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Solution Overview
Problem
Existing subterranean well tools, particularly perforating guns, face risks of premature actuation due to electrical mismanagement, and existing safety measures do not fully eliminate the risk of accidental detonation when lowering tools into hydrocarbon wells.
Innovation Solution
Incorporating a meltable material component that changes state from a solid to a liquid at elevated downhole temperatures, allowing for controlled actuation of tool components, such as shear pins or firing pins, after a predetermined period, thereby ensuring safe operation and preventing premature activation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrical safety measures (open circuits, pressure switches, arming switches) are implemented to prevent premature actuation, then safety is improved, but device complexity increases
Solution Approach 1:
The patent changes the physical state parameter of the meltable material from solid to liquid by exposing it to downhole temperatures, which automatically actuates the tool without requiring complex electrical safety systems. This parameter-based actuation simplifies the overall device complexity while maintaining safety
Solution Approach 2:
The patent replaces complex electrical safety mechanisms (pressure-actuated switches, arming switches) with a thermal-mechanical system using meltable material. The heat from the wellbore environment directly causes the material to melt and release the tool, substituting electrical complexity with a simpler thermal response system
2Reliability
If meltable material component is used for controlled actuation, then premature actuation risk is reduced, but device complexity increases
Solution Approach 1:
The meltable material serves as an intermediary between the downhole thermal environment and the tool actuation mechanism. It absorbs thermal energy and converts it to mechanical action (melting and releasing the tool), providing a simple intermediate step that prevents premature actuation without adding significant complexity
Solution Approach 2:
The meltable material automatically responds to the downhole temperature environment without requiring external control systems. The material self-actuates the tool by melting when exposed to the predetermined temperature, eliminating the need for complex control mechanisms while ensuring reliable premature actuation prevention
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
This solution provides a controlled and safe actuation mechanism for well tools, reducing the risk of accidental detonation and allowing for sequential operation of tools at different depths, enhancing the efficiency and safety of hydrocarbon well operations.
Implementation Method 1
The meltable material is configured to have a solid first state while the meltable material is at the first temperature. The meltable material in the first state has one or more mechanical properties sufficient to avoid mechanical failure of the component and is configured to have a second state when the meltable material is at the second temperature.
Implementation Method 2
The meltable material is configured to change from the solid first state to the second state after a predetermined period of time
Data Source
AI summary
A tool for use within a subterranean well extending from a wellhead to a subterranean location, wherein the wellhead resides at a first temperature and the subterranean well increases in temperature in a direction from the wellhead to the subterranean location, increasing from the first temperature to a higher second temperature, includes a component including a meltable material. The meltable material is configured to have a solid first state while the meltable material is at the first temperature. The meltable material in the first state has one or more mechanical properties sufficient to avoid mechanical failure of the component and is configured to have a second state when the meltable material is at the second temperature. The meltable material in the second state is lacking the one or more mechanical properties necessary to avoid mechanical failure.