EAT Sensor Assemblies with Cam Grippers for Multi-Point Logging
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Solution Overview
Problem
Current retrievable logging systems for distributed acoustic sensing and Distributed Temperature Sensing systems can only log one point at a time, limiting the ability to measure multiple physical parameters simultaneously along a well bore.
Innovation Solution
The Electro Acoustic Technology (EAT) sensor system allows for the deployment of multiple sensors along a fiber-based wireline cable, using a modular launcher/retriever system and cam grippers to attach and detach EAT sensor assemblies at various points, converting sensor data into perturbations on an optical fiber for real-time data transmission to the surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If point sensors are used at the distal end of the fiber-based wireline cable, then data can be logged and stored in memory or communicated to surface, but only one point can be logged at any given time
Solution Approach 1:
The system divides the wellbore into multiple discrete sensing zones by deploying multiple EAT sensor assemblies at different depths along the wireline cable. Each sensor assembly independently measures parameters at its specific location, enabling simultaneous multi-point data collection throughout the wellbore rather than single-point measurement
Solution Approach 2:
The system uses a common optical fiber cable to perform multiple functions: it serves as both the transmission medium for data from multiple distributed sensors and as the structural backbone for deploying and retrieving various sensor assemblies. The single fiber infrastructure supports both distributed acoustic sensing (DAS) and distributed temperature sensing (DTS) simultaneously
2Adaptability or versatility
If multiple sensors are deployed along the wireline cable, then simultaneous measurement of multiple parameters is enabled, but deployment and retrieval complexity increases
Solution Approach 1:
The EAT sensor assemblies are equipped with self-activating cam grippers that automatically engage with the wireline cable when the assembly is launched downhole. The cam mechanism self-activates upon contact with the cable, gripping it securely without requiring external actuation or complex deployment procedures. Similarly, retrieval is simplified by the same self-activating mechanism that releases the cable when pulled back
Solution Approach 2:
The cam grippers transition between engaged and disengaged states dynamically based on the direction of force applied to the sensor assembly. When launched downward, the cam engages the wireline cable; when pulled upward for retrieval, the cam automatically disengages. This dynamic behavior simplifies both deployment and retrieval operations without requiring additional control systems
3Ease of manufacture
If a common optical fiber is used for data transmission from multiple sensors, then manufacturing complexity and costs are reduced, but sensor attachment and detachment mechanisms must be reliable
Solution Approach 1:
The cam grippers utilize dynamic mechanical advantage to achieve reliable attachment and detachment. The cam mechanism converts small rotational movements into large gripping forces when engaging the wireline cable, ensuring secure attachment during downhole operations. The same mechanism easily releases the cable during retrieval by reversing the rotational force, providing reliable bidirectional control
Solution Approach 2:
The cam mechanism employs curved surfaces that convert rotational motion into linear gripping force. The spherical or cam-shaped profile allows for smooth engagement and disengagement while maintaining consistent contact pressure on the wireline cable, ensuring reliable attachment without requiring complex locking mechanisms or multiple fastening points
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 simultaneous deployment and real-time data collection of multiple point sensors for parameters like pressure and temperature, improving reliability and reducing manufacturing complexity and costs by using a common optical fiber for data transmission, suitable for high-temperature environments.
Implementation Method 1
converting sensor data into perturbations on an optical fiber for real-time data transmission to the surface
Implementation Method 2
cam grippers to attach and detach EAT sensor assemblies at various points
Data Source
AI summary
A system for launching or retrieving wireline electro acoustic technology (EAT) sensor assemblies in a downhole wellbore comprises an EAT launcher/retriever section and an EAT sensor assembly for placement in the EAT launcher/retriever section. The EAT launcher/retriever section comprises an external high pressure housing, attachment means at each end of the external high pressure housing, and a wedge shaped internal retractable launcher plate with an opening on one side to allow a fiber based wireline cable to pass through the EAT launcher section. The EAT sensor assembly comprises a center section comprising sensors and two end sections, each end section with a set of extendable grippers to grip a fiber based wireline cable, wherein the center section and both end sections comprise a V groove that allows the EAT sensor assembly to be centered on the fiber based wireline cable.