Inflatable Packer Pressure Relief Valve
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Solution Overview
Problem
Inflatable production packers (IPPs) used in oil and gas operations often fail in hot downhole environments due to increased fluid pressure causing the rubber element to rupture.
Innovation Solution
A downhole tool with an inner mandrel, a first valve that allows fluid to flow into an inflatable element, and a second pressure relief valve that vents excess fluid to prevent pressure buildup and potential rupture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluid pressure is increased to inflate the rubber element for sealing, then the sealing capability is improved, but the risk of rubber element rupture increases due to heat-induced pressure buildup
Solution Approach 1:
A pressure relief valve assembly is introduced as an intermediary component between the fluid source and the inflatable rubber element. This valve assembly includes a valve body with a pressure relief valve that automatically opens when fluid pressure exceeds a predetermined threshold, allowing excess fluid to escape and preventing dangerous pressure buildup that could rupture the rubber element
Solution Approach 2:
The pressure relief valve changes the pressure parameter dynamically by maintaining it below a critical threshold. When pressure reaches the threshold level, the valve opens to reduce pressure, and closes when pressure drops, thereby continuously regulating pressure to prevent rupture while allowing sufficient inflation for sealing
2Temperature
If the downhole tool is exposed to high temperatures in the downhole environment, then the tool can operate in deeper wells, but the fluid pressure increases due to thermal expansion, risking rubber element failure
Solution Approach 1:
The pressure relief valve is pre-configured with a spring mechanism that provides beforehand cushioning against pressure increases. The spring is calibrated to compress and allow valve opening at a predetermined pressure threshold, providing advance protection against thermal pressure buildup before it reaches dangerous levels that could cause rubber element failure
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 effectively prevents the inflatable element from rupturing in high-pressure, high-temperature downhole environments by managing pressure through the second valve, ensuring the tool's integrity and functionality.
Implementation Method 1
The increased pressure compresses the spring and allows a pressure of a fluid within the tool to increase, which inflates a rubber element
Implementation Method 2
a second valve configured to vent some of the fluid within the inflatable element to an exterior of the downhole tool in response to the fluid reaching a second valve pressure threshold
Implementation Method 3
The increased pressure compresses the spring and allows a pressure of a fluid within the tool to increase, which inflates a rubber element, thereby setting the tool
Data Source
AI summary
A downhole tool includes an inner mandrel having an inner mandrel bore that extends axially-therethrough. The downhole tool also includes a first valve configured to move between a first position and a second position. The downhole tool also includes an inflatable element configured to inflate and expand radially-outward and into contact with a surrounding tubular in response to the first valve moving to the second position, which permits a fluid in the inner mandrel bore to flow into the inflatable element. The downhole tool also includes a second valve configured to vent some of the fluid within the inflatable element to an exterior of the downhole tool in response to the fluid reaching a second valve pressure threshold.