Downhole Sensor Array Spacer for Heat-Resistant Welding
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Solution Overview
Problem
Conventional temperature sensor arrays using optical fibers face issues with data transmission when bent, are fragile, and prone to failure under downhole conditions, and conventional bonding methods expose components to excessive heat during welding, making them unsuitable for extreme pressures and temperatures.
Innovation Solution
A downhole distributed sensor array with sensor housings and cable segments featuring a conductor with insulation and a retention element, where the conductor is secured by a spacer to prevent movement and exposure to heat during welding, and the cable segments are bonded using a weld joint to create a robust and sealed connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional bonding methods such as welding are used to provide robust connection between components, then connection strength is improved, but sensitive components are exposed to excessive heat that may cause damage
Solution Approach 1:
The sensor array is divided into modular sensor assemblies, each with its own housing and bonding interface. This segmentation allows the bonding process to be localized to specific areas away from sensitive components, enabling robust connections without exposing the entire sensor array to excessive heat
Solution Approach 2:
A bonding interface or transition structure serves as an intermediary between the cable assembly and sensor housing. This intermediary structure can withstand the heat of welding while protecting the sensitive optical fibers and sensor components from thermal damage
2Measurement precision
If optical fibers are used as temperature sensors, then continuous temperature profile measurement is achieved, but the fibers are fragile and prone to failure under shock and vibration
Solution Approach 1:
The optical fibers are encased in protective flexible sheathing or thin film structures that provide mechanical protection against shock and vibration while allowing the fibers to maintain their sensing function. This protective layer acts as a buffer that absorbs mechanical stresses without transmitting them to the fragile fiber core
Solution Approach 2:
The fiber optic cable is constructed as a composite structure combining the optical fiber core with protective materials such as polymer coatings, metal armors, or reinforcement elements. This composite construction maintains the optical sensing capability while adding mechanical strength and resistance to environmental stresses
3Adaptability or versatility
If optical fibers are bent to a small radius of curvature, then cable routing flexibility is improved, but data transmission fails when bent below a certain radius
Solution Approach 1:
The optical fiber is protected by a flexible protective sheath that maintains a minimum bend radius while allowing sufficient flexibility for cable routing. This sheath prevents the fiber from being bent below the critical radius where data transmission would fail, thus maintaining both flexibility and transmission integrity
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
The solution provides a robust and reliable connection between sensors, withstands extreme pressures and temperatures, and prevents damage to sensitive components during the welding process, ensuring continuous data transmission and prolonged functionality.
Implementation Method 1
a weld joint peripherally bonding a longitudinal end portion of the at least one sensor housing to the outer jacket of a cable segment
Implementation Method 2
The spacer is configured to at least partially support a portion of the conductor to prevent the conductor from moving into a position where the conductor is exposed to heat during a welding process
Implementation Method 3
comprising an insulation material disposed between a central conductor and an outer jacket
Data Source
AI summary
A downhole sensor includes a sensor housing with one or more of a pressure sensor or a temperature sensor. A cable segment having a conductor is coupled to the sensor housing. A spacer or retention element is coupled to or secured to at least a portion of the conductor at a location proximate an interface between the cable segment and the sensor housing. Downhole sensor arrays include such sensor housings. Methods relate to forming such sensor arrays.