Downhole Position Sensor for Service String Location
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Solution Overview
Problem
Current methods for determining the position of a service string within a wellbore in a subterranean formation are inadequate, particularly in multi-zone wellbores, as they lack precise real-time location sensing and communication of the service string's position to the surface, which can lead to potential damage and improper positioning.
Innovation Solution
A downhole position sensor system that includes location-sensing components such as electric gauges and fiber optic cables, coupled with a stimuli-producing device, which communicates real-time position data to the surface through an electric or fiber optic cable, allowing for accurate positioning of the service string within the wellbore.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If no position sensing system is installed, then the wellbore assembly remains simple, but the service string position cannot be determined accurately
Solution Approach 1:
A stimuli-producing device is installed on the service string to generate detectable signals (such as acoustic, electromagnetic, or optical stimuli). These stimuli serve as intermediaries that allow the position sensor to detect the service string's location without requiring direct physical contact or complex sensing mechanisms on the service string itself. The stimuli act as a mediator between the service string and the position sensor, enabling accurate position determination while keeping the service string relatively simple.
Solution Approach 2:
The patent replaces traditional mechanical position sensing methods with non-mechanical detection systems. Instead of using mechanical encoders, resolvers, or direct mechanical linkages on the service string, the system uses position sensors that detect stimuli produced by the service string through acoustic, electromagnetic, or optical fields. This substitution eliminates complex mechanical components while achieving precise position measurement.
2Reliability
If real-time position monitoring is implemented, then service string location can be tracked continuously, but the system complexity and cost increase
Solution Approach 1:
The stimuli-producing device on the service string generates continuous detectable signals that serve as intermediaries for real-time position monitoring. These stimuli (acoustic, electromagnetic, or optical) allow the position sensor to continuously track the service string's location without requiring complex mechanical linkages or direct mechanical coupling, thereby achieving reliable real-time monitoring with reduced system complexity.
Solution Approach 2:
The position sensor system is designed to detect multiple types of stimuli (acoustic, electromagnetic, optical), making it a multi-functional device that can determine position through various physical phenomena. This universality allows the same sensor system to handle different service string configurations and environmental conditions, improving reliability while avoiding the need for multiple specialized sensing systems.
3Measurement precision
If position sensors are installed on the completion string, then the service string position can be determined, but the overall system complexity increases
Solution Approach 1:
The system divides the position determination function into two separate components: a stimuli-producing device mounted on the service string and a position sensor mounted on the completion string. This segmentation allows each component to be optimized independently - the service string carries only the lightweight stimuli generator while the completion string carries the sensing equipment. The division of functionality reduces overall system complexity compared to integrating all sensing mechanisms on a single string.
Solution Approach 2:
The stimuli produced by the service string act as intermediaries that bridge the gap between the two separate components. These detectable signals (acoustic, electromagnetic, or optical) allow the position sensor on the completion string to determine the service string's position without requiring direct mechanical connection or integration, thereby reducing system complexity while maintaining measurement precision.
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 precise and real-time determination of the service string's location within the wellbore, reducing the risk of damage and ensuring proper positioning across various zones, thereby enhancing the efficiency and safety of well drilling and completion operations.
Implementation Method 1
a stimuli-producing device positioned on the service string and configured to produce a stimulus; a position sensor positioned on the completion string and configured to detect the stimulus produced by the stimuli-producing device
Data Source
AI summary
A wellbore system can include a completion assembly having a completion string. The system can also include a service string that can be positioned within an inner diameter of the completion string. A location-sensing component can be positioned on the completion string or the service string. A communication link communicatively coupled with the location-sensing component can transmit signals representing a stimuli detected by the location-sensing component. A stimuli-producing device can output the stimuli that is detected by the location-sensing component. A stimuli-producing device can be positioned on the other of the completion string or the service string.