Hydro-Mechanical Sounding for Downhole Acoustic Telemetry Feedback
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Solution Overview
Problem
Existing data telemetry systems in wellbores, such as mud pulse, wired drillpipe, and electromagnetic systems, require complex and costly electro-mechanical technologies, making them impractical for simpler downhole tools like packers and sleeves, which lack positive surface indications of function.
Innovation Solution
A hydro-mechanical sounding device using a piston and striking surface to produce acoustic vibrations in response to hydraulic pressure, eliminating the need for expensive batteries and electronics, and an acoustic telemetry system to relay these vibrations for positive feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electro-mechanical sounding technologies are used to enable acoustic telemetry in downhole tools, then reliable acoustic signal communication is achieved, but the cost and device complexity increase significantly
Solution Approach 1:
The patent replaces electro-mechanical sounding technologies with a purely mechanical acoustic vibration generation system. A piston element is actuated by hydraulic pressure from the wellbore assembly to directly strike a striking surface, producing acoustic vibrations without requiring batteries, electronics, or complex electro-mechanical components. This mechanical substitution resolves the contradiction by maintaining reliable acoustic communication while dramatically reducing device complexity and cost.
Solution Approach 2:
The invention utilizes hydraulic pressure from the wellbore assembly to actuate the piston element. The hydraulic system provides the force necessary to move the piston against spring pressure and strike the striking surface, converting hydraulic energy directly into acoustic vibrations. This approach eliminates the need for separate power sources and electronic control systems, resolving the technical contradiction between reliability and complexity.
2Loss of information
If electro-mechanical apparatus is added to downhole tools for acoustic telemetry, then positive surface indications of tool function are achieved, but the cost becomes prohibitive for simpler tools
Solution Approach 1:
The patent replaces expensive electro-mechanical apparatus with a simple mechanical acoustic vibration system. The piston-striking-surface mechanism produces acoustic signals that travel through the wellbore assembly to provide positive surface indications of tool function. This mechanical approach dramatically reduces cost while maintaining the ability to communicate tool status to the surface, resolving the contradiction between information transmission and cost.
Solution Approach 2:
The system utilizes the existing hydraulic pressure from the wellbore assembly to actuate the acoustic vibration mechanism. The hydraulic pressure that is already present in the system during normal operation is harnessed to drive the piston, eliminating the need for separate power sources or additional energy systems. This self-service approach reduces cost while maintaining functional indication capability.
3Device complexity
If downhole tools use simple hydraulic or mechanical actuation without electro-mechanical components, then cost is reduced, but positive surface indications of function are not achieved
Solution Approach 1:
The patent merges the hydraulic actuation system with the acoustic signal generation system by using the same hydraulic pressure to both actuate the downhole tool and drive the piston for acoustic communication. The spring-loaded piston mechanism is integrated into the hydraulic system, so that the hydraulic pressure that actuates the tool also triggers the acoustic indication. This merging resolves the contradiction by providing surface indications at minimal additional cost.
Solution Approach 2:
The system provides feedback to the surface by generating acoustic vibrations that indicate tool function. The piston strikes the striking surface in response to hydraulic pressure changes caused by tool operation, creating acoustic signals that propagate through the wellbore assembly to provide real-time feedback on tool status. This feedback mechanism resolves the contradiction between low cost and information transmission by using the existing hydraulic system for both actuation and communication.
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
Provides reliable and cost-effective acoustic telemetry for downhole tools without complex electronics, ensuring positive surface indications of tool function without the need for expensive electro-mechanical components.
Implementation Method 1
The piston is movable from a first position proximate the at least one inlet port toward a second position against the striking surface in response to a hydraulic pressure differential between the first and second faces
Implementation Method 2
The second face of the piston is configured to strike the striking surface and is configured to produce an acoustic vibration in response thereto
Data Source
AI summary
An acoustic telemetry system used with a wellbore assembly in a wellbore includes a hydro-mechanical sounding devices, relays, and a receiver. The sounding device includes a housing defining a chamber with an inlet port and at least one outlet port. A piston disposed in the chamber is movable against a strike face in the chamber in response to a hydraulic pressure differential. The impact of the piston against the strike face can produce an acoustic vibration, which can have defined characteristics. One or more relays disposed on the tubing electronically generate an acoustic signal in response to the acoustic vibration produced by the device. The acoustic signal can then be telemetered to a receiver at surface to determine a positive indication of an operation downhole.