Acoustic Position Indicator for Downhole Tool
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Solution Overview
Problem
In oilfield operations, accurately positioning tools downhole is challenging due to the distance from the operator, leading to potential damage and costly issues, especially in wells with multizone completions, as existing methods fail to provide reliable information about tool positioning.
Innovation Solution
A system that generates a recognizable signal using a signal generator, such as a slidable mass or electronic device, which interacts with a detectable portion on a tubing section to produce a pressure wave, allowing for the determination of tool position through a hydrophone or similar device at the surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If tools are positioned downhole at significant distance from operator, then operational reach is improved, but positioning accuracy deteriorates
Solution Approach 1:
The patent introduces an acoustic signal generator as an intermediary device that is positioned on or near the downhole tool. This signal generator emits acoustic signals that can be detected by hydrophones or other acoustic sensors in the wellbore environment. The acoustic signals serve as a mediator between the distant tool and the surface operator, enabling precise position determination without requiring the operator to be physically close to the tool.
Solution Approach 2:
The patent replaces direct mechanical observation or visual positioning methods with an acoustic field-based system. Instead of relying on mechanical linkages or direct visual contact that would require proximity, the system uses acoustic wave propagation through the wellbore fluid to transmit position information from the distant tool to the surface, substituting mechanical/visual methods with acoustic sensing.
2Measurement precision
If accurate positioning methods are implemented, then tool position determination is improved, but device complexity increases
Solution Approach 1:
The acoustic signal generator is integrated directly into the downhole tool assembly, making the positioning system self-contained. The tool carries its own positioning signal source, eliminating the need for separate external positioning equipment or complex surface-based tracking systems. This self-service approach enables accurate positioning while minimizing overall system complexity.
Solution Approach 2:
The acoustic signal generator can serve multiple functions: it provides position identification, can indicate tool orientation, and may serve as a communication marker. This multi-functionality reduces the need for separate dedicated positioning components, thereby simplifying the overall system while maintaining accurate position determination capabilities.
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
Enables accurate and reliable positioning of tubing sections and tools downhole, reducing the risk of damage and operational costs by providing a repeatable and detectable signal that indicates the precise location of tools within the wellbore.
Implementation Method 1
A recognizable signal can be generated downhole... generate a pressure wave
Data Source
AI summary
Assemblies and methods of use are disclosed for determining a position of a body within a tubing section. A signal generator coupled to the body is operable to generate a pressure wave in response to detecting a detectable portion of the tubing section when the body is moved relative to the tubing section.