Downhole Inflation Tool Radial Expansion Control
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Solution Overview
Problem
Packers in the oil and gas field face challenges in expanding radially to seal against larger tubulars, as they often need to pass through restrictions and then increase in size to effectively isolate wellbore regions for pressure containment.
Innovation Solution
A downhole tool with a housing containing a charge chamber and a hydraulic chamber, where charges ignite to expand gas, displacing hydraulic fluid and inflating an inflatable element radially outward through a fluid-metering device, ensuring controlled expansion and sealing against surrounding tubulars.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the padder increases radial dimension to seal against larger tubulars, then sealing effectiveness is improved, but the device cannot pass through restrictions in the wellbore
Solution Approach 1:
The device is divided into two distinct configurations: a run-in configuration with reduced radial dimension for passing through restrictions, and a set configuration with increased radial dimension for sealing. The sealing element is segmented to allow compression during run-in and expansion during setting, enabling the device to transition between size requirements.
Solution Approach 2:
The sealing element transitions dynamically between compressed and expanded states. During run-in, the sealing element is compressed to reduce radial dimension for passing through restrictions. Upon reaching the target location, the sealing element expands to increase radial dimension for effective sealing against the tubular.
2Length of moving object
If the sealing element is compressed to reduce radial size for passing through restrictions, then the device can navigate wellbore restrictions, but sealing effectiveness is reduced
Solution Approach 1:
The sealing element is pre-configured in a compressed state during run-in to navigate restrictions, then undergoes a preliminary expansion action when the setting mechanism is activated. This preliminary action prepares the sealing element for its final expanded sealing configuration, ensuring both navigation capability and sealing effectiveness are achieved in sequence.
3Productivity
If rapid inflation is used to quickly seal the wellbore, then productivity is improved, but control over the inflation process is reduced
Solution Approach 1:
A fluid-metering device acts as an intermediary between the hydraulic fluid source and the sealing element. This intermediary component regulates the flow rate of hydraulic fluid, enabling controlled inflation of the sealing element while maintaining productivity. The fluid-metering device translates rapid hydraulic fluid availability into controlled, manageable inflation of the sealing element.
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 tool effectively expands and seals against larger tubulars, providing reliable pressure containment by using the hydraulic fluid to inflate the inflatable element, ensuring efficient isolation of wellbore regions.
Implementation Method 1
one or more charges disposed in the charge chamber. The one or more charges are configured to ignite and thereby expand a gas in the charge chamber
Implementation Method 2
a hydraulic chamber containing a hydraulic fluid, and a piston disposed in the hydraulic chamber. The piston prevents the hydraulic fluid from communicating with the charge chamber
Data Source
AI summary
A downhole tool and method, of which the downhole tool includes a housing defining a charge chamber and a hydraulic chamber, the hydraulic chamber containing a hydraulic fluid, and a piston disposed in the hydraulic chamber. The piston prevents the hydraulic fluid from communicating with the charge chamber, and is in communication with the hydraulic fluid and the charge chamber. The tool also includes one or more charges disposed in the charge chamber. The one or more charges are configured to ignite and thereby expand a gas in the charge chamber. The tool further includes a fluid-metering device coupled to the housing. The fluid-metering device is configured to control a rate at which the hydraulic fluid is pressed out of the hydraulic chamber.