Wireless Packer Activation via Acoustic Drill String Signals
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Solution Overview
Problem
Deepwater subsea oil wells pose significant safety challenges due to communication and control issues during emergencies, with existing safety systems often failing to prevent blowouts and hydrocarbon leaks, particularly in deep water environments where additional equipment installation is complicated and conventional control mechanisms may lose functionality.
Innovation Solution
A wireless signal-based safety mechanism, utilizing acoustic or electromagnetic signals, to activate a packer or obstructing member within the well to create a barrier against fluid flow, independent of traditional control lines, with sensors to detect emergency parameters and trigger the mechanism, ensuring well integrity even in damaged or severed communication scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional safety equipment is added at the seabed, then well safety is improved, but device complexity and installation difficulty increase
Solution Approach 1:
The patent replaces conventional mechanical control systems (hydraulic control lines, electrical cables) with acoustic wave transmission through the drill string. Acoustic transducers convert electrical signals to acoustic waves that propagate through the drill string, enabling control and monitoring without physical communication lines. This substitution eliminates the vulnerability of mechanical control systems while maintaining safety functionality.
Solution Approach 2:
The drill string serves multiple functions: it acts as both the drilling/production conduit and the communication medium for safety mechanisms. The same drill string that penetrates the wellbore also transmits acoustic signals for activating packers, valves, and other safety devices. This multi-functionality eliminates the need for separate communication infrastructure, reducing overall system complexity.
2Ease of operation
If conventional control mechanisms are used downhole, then control functionality is achieved, but reliability is reduced due to loss of control lines during blow-out
Solution Approach 1:
The patent replaces vulnerable mechanical control lines (hydraulic and electrical) with acoustic wave transmission through the drill string. During a blow-out, traditional control lines can be severed or become inoperative, but the drill string remains intact and can continue to transmit acoustic signals. This substitution ensures control functionality is maintained even under extreme conditions.
Solution Approach 2:
The system incorporates acoustic transducers and emergency control mechanisms that are pre-installed in the drill string before any emergency occurs. These components are positioned and configured in advance to automatically or remotely activate safety devices (packers, valves) when acoustic signals are transmitted, ensuring immediate response without relying on intact mechanical control lines.
3Adaptability or versatility
If wireless signal transmission is implemented, then independence from control lines is achieved, but signal transmission reliability in deep water is challenged
Solution Approach 1:
The patent substitutes electromagnetic wireless transmission (which attenuates rapidly in water) with acoustic wave transmission through the solid drill string. Acoustic waves propagate efficiently through the metal drill string over long distances, providing reliable signal transmission in deep water environments where electromagnetic signals would fail.
Solution Approach 2:
The drill string acts as an intermediary medium for signal transmission between surface equipment and downhole safety devices. Acoustic transducers mounted on the drill string convert electrical control signals into acoustic waves that travel through the drill string to activate packers, valves, and other safety mechanisms at depth, providing a reliable communication pathway independent of water conditions.
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
Enhances well safety by providing a reliable, independent means to shut off fluid flow during emergencies, reducing the risk of blowouts and environmental damage, even when conventional control systems fail, and allows for remote activation without physical communication lines.
Implementation Method 1
the packer may be provided in the expanded state to provide a further barrier against fluid movement therepast
Implementation Method 2
The wireless signal is preferably an acoustic signal and may travel through elongate members and/or well fluid
Implementation Method 3
in the event of a blow-out, the ability to function these devices may be lost due to the inability to fluctuate pressure to control pressure activated devices
Data Source
Figure 1
Figure 2~3
Figure 4a~4c
AI summary
A well (10) comprising a packer apparatus, the packer apparatus comprising: a packer (16) and an activation mechanism; wherein the activation mechanism comprises an expansion mechanism for expanding the packer (16) and a wireless receiver (360) optionally a transceiver. For certain embodiments the wireless receiver may be acoustic and/or electromagnetic. The receiver is adapted to receive a wireless control signal and control the activation mechanism and wherein the packer apparatus is provided downhole in any one of the following locations, (i) on a production tubing; (ii) in a casing annulus between two different casing strings; (iii) between the casing and formation; and, (iv) on a sub-assembly within an uncased section of the well.